Δημόσια διαβούλευση της ΡΑΕ επί της αναθεωρημένης εισήγησης του ΔΕΣΦΑ για το Πρόγραμμα Ανάπτυξης του ΕΣΦΑ 2022-2031

(1), ο ΔΕΣΦΑ υπέβαλε στη ΡΑΕ την πρότασή του για το Πρόγραμμα Ανάπτυξης του ΕΣΦΑ για τα έτη 2022-2031 τον Ιανουάριο

1. Έκτοτε, ο ενεργειακός τομέας έχει βιώσει σημαντικές αλλαγές, οι οποίες επιβάλλουν την – σε μεγάλο βαθμό – αναθεώρηση των προτεραιοτήτων όσον αφορά στις υποδομές φυσικού αερίου. Στο πλαίσιο αυτό, παρακαλούμε για την επανυποβολή του Προγράμματος Ανάπτυξης 2022-2031 έως τις 30 Ιουνίου 2022, λαμβάνοντας υπόψη τα ακόλουθα, όπως συζητήθηκαν κατά την από 9.6.2022 συνάντησή μας:
2. Σταθμός Συμπίεσης στην Κομοτηνή Προκειμένου να ικανοποιηθούν οι αυξημένες λειτουργικές ανάγκες του Συστήματος και να ενισχυθούν οι ροές προς την Βουλγαρία μέσω του αγωγού IGB, παρακαλούμε όπως διερευνήσετε την ένταξη μίας επιπλέον μονάδας συμπίεσης δυναμικότητας 3,5 MW ISO, η οποία θα λειτουργεί ως εφεδρική των 2 x 3,5 MW που ήδη σχεδιάζονται. Επίσης, να υπάρχει πρόβλεψη για πιθανή προσθήκη στο μέλλον τέταρτης μονάδας, για την οποία θα μπορούσε να εξασφαλιστεί ευρωπαϊκή χρηματοδότηση (CEF), δεδομένου ότι ο συμπιεστής έχει ενταχθεί στον 5ο κατάλογο Έργων Κοινού Ευρωπαϊκού Ενδιαφέροντος (PCIs). Τονίζεται επίσης η ανάγκη επίσπευσης της ολοκλήρωσης του έργου στο μέγιστο δυνατό βαθμό.
3. Έξοδοι Δυτικής Μακεδονίας από τον αγωγό ΤΑΡ Σύμφωνα με το Πρόγραμμα Ανάπτυξης 2021-2030, έχει δρομολογηθεί η τροφοδότηση των σημείων εξόδου της Δυτικής Μακεδονίας σε Πόρεια, Περδίκκα και Άσπρο μέσω της σύνδεσής τους με τον αγωγό ΤΑΡ. Με δεδομένα τα πλέον πρόσφατα στοιχεία σχετικά με τις προβλεπόμενες δυναμικότητες των δικτύων διανομής, τα εκτιμηθέντα κόστη σύνδεσης με τον ΤΑΡ και τα χρονοδιαγράμματα, παρακαλούμε για τη διερεύνηση εναλλακτικών τρόπων τροφοδότησης των σχετικών δικτύων διανομής μέσω LNG ή CNG, κατά τρόπο οικονομικά και λειτουργικά βέλτιστο. Για τις εξόδους του Περδίκκα και του Άσπρου οι οποίες είναι προσωρινές έως την ολοκλήρωση του αγωγού προς τη Δυτική Μακεδονία, είναι σκόπιμο τυχόν εγκαταστάσεις να είναι δυνατό να μετακινηθούν στη συνέχεια σε άλλες περιοχές.
4. Αγωγοί προς Πάτρα και Ιωάννινα Σχετικά με τους αγωγούς επέκτασης του Συστήματος προς τη Δυτική Ελλάδα (Πάτρα και Ιωάννινα), παρακαλούμε για την διερεύνηση εναλλακτικών δυνατοτήτων τροφοδότησης των εν λόγω περιοχών με φυσικό αέριο, ιδίως προτείνοντας ολοκληρωμένο σχήμα «εικονικού αγωγού» (virtual pipeline) μέσω φορτηγών αυτοκινήτων ή πλοίων μεταφοράς LNG. Θεωρούμε εύλογο η οριστική απόφαση επί του θέματος να ληφθεί στο πλαίσιο του επόμενου Προγράμματος Ανάπτυξης, μετά την έκδοση του νέου Εθνικού Σχεδίου για την Ενέργεια και το Κλίμα (ΕΣΕΚ), στο οποίο θα οριστικοποιηθούν οι εθνικοί στόχοι για το φυσικό αέριο και τα εναλλακτικά καύσιμα. Περαιτέρω, παρακαλούμε για τις εισηγήσεις σας για τα κάτωθι:
5. Αλλαγές στον Κώδικα Διαχείρισης ΕΣΦΑ που τυχόν απαιτούνται προκειμένου για την έναρξη Market Test ώστε να διερευνηθεί το ενδιαφέρον και η αναγκαιότητα επαύξησης του Συστήματος, όπως προτείνετε στη υπό σχετικό

(2)επιστολή σας. Σημειώνουμε ότι δεν θεωρούμε προαπαιτούμενο την πρότερη λήψη οριστικής επενδυτικής απόφασης για την ανάπτυξη της υπόγειας αποθήκης της Νότιας Καβάλας.

1. Μόνιμη εγκατάσταση FSU στη Ρεβυθούσα, το οποίο θα είναι σταθερά συνδεδεμένο στις εγκαταστάσεις του νησιού. Παρακαλούμε για σχετική ανάλυση του σχετικού κόστους και του εκτιμώμενου οφέλους. Πέραν της βελτιστοποίησης της χρήσης της υπάρχουσας δυναμικότητας αεριοποίησης, να διερευνηθεί επιπλέον η δυνατότητα αύξησης αυτής.
2. Αιτιολόγηση των καθυστερήσεων που σημειώνονται έναντι του εγκεκριμένου Προγράμματος Ανάπτυξης 2021-2030, ιδίως στα «Έργα Ανάπτυξης, Αύξησης Δυναμικότητας και Ασφάλειας Εφοδιασμού ΕΣΦΑ (ενότητα Β5), αξιολόγηση των επιπτώσεων της απόκλισης στο χρονοδιάγραμμα υλοποίησης (π.χ. στα συνδεόμενα έργα, στους Χρήστες του ΕΣΦΑ αλλά και στις γειτονικές αγορές και στην ασφάλεια εφοδιασμού της χώρας), καθώς και τεκμηρίωση των μέτρων που σκοπεύει να λάβει ο Διαχειριστής για την διασφάλιση της υλοποίησης των ανωτέρω έργων στο νέο χρονοδιάγραμμα και για την αντιμετώπιση των επιπτώσεων από την καθυστέρησή τους. Παραμένουμε στη διάθεσή σας για οποιαδήποτε περαιτέρω διευκρίνιση. Σε υλοποίηση απόφασης της από 09.06.2022 Ολομέλειας της Αρχής. Με εκτίμηση, Ο Πρόεδρος της ΡΑΕ Αναπλ. Καθ. Αθανάσιος Δαγούμας Προς To ΡΥΘΜΙΣΤΙΚΗ ΑΡΧΗ ΕΝΕΡΓΕΙΑΣ Regulatory Authority for Energy Πειραιώς 132 132 Piraeus Str 11854 Αθήνα 11854 Athens Αθήνα, 15/7/2022 Athens, 15/7/2022 Αρ. Πρωτ.: 142083 Prot. Nr: 142083 Υπόψη: Aν. Καθ. Αθανασίου Δαγούμα, Προέδρου Att: As.Prof. Athanassios Dagoumas, President Θέμα: Υποβολή του αναθεωρημένου Σχεδίου Προγράμματος Ανάπτυξης 2022-2031 Subject: Submission of the updated Draft Development Plan 2022-2031 Συν. 1i,ii: «Σχέδιο Προγράμματος Ανάπτυξης του ΕΣΦΑ 2022-2031», στα ελληνικά και αγγλικά Συν. 2: Επικαιροποιημένη Έκθεση Παρακολούθησης του Προγράμματος Ανάπτυξης 2021-2030 Συν. 3: Παρουσίαση με τις αλλαγές του Σχεδίου Προγράμματος Ανάπτυξης 2022-2031 Att. 1i,ii: “Draft NNGS Development Plan 2022-2031”, in Greek and in English Att. 2: Updated Monitoring Report of the Development Plan 2021-2030 Att.3: Presentation with the amendments to the draft NNGS Development Plan 2022-2031 Συν.4 : Συγκριτική ανάλυση της τροφοδοσίας με φυσικό αέριο των περιοχών Άσπρος, Πόρεια και Περδίκκας Συν.5 : Συγκριτική ανάλυση τροφοδοσίας της περιοχής των Ιωαννίνων Att.4: Comparative analysis for the supply with natural gas of the regions Aspros, Poria & Perdikas Att.5: Comparative analysis for the supply with natural gas of the region οf Ioannina Σχετικά:

(1)Επιστολή ΡΑΕ Ο-95300, 17.06.2022 με θέμα «Επί του Προγράμματος Ανάπτυξης ΕΣΦΑ 20222031» Ref:

(1)Letter RAE Ο-95300, 17.06.2022 with subject "On the Development Plan of the NNGS 2022-2031” Αξιότιμε κ. Πρόεδρε, Σε συνέχεια της από 17.06.2022 επιστολή της Αρχής (Σχετικό 1) επανυποβάλλουμε το Σχέδιο Προγράμματος Ανάπτυξης ΕΣΦΑ 2022-2031 λαμβάνοντας υπόψη τα σχόλια και τις παρατηρήσεις σας όπως αυτές αποτυπώθηκαν στην προαναφερθείσα επιστολή. Στο συνημμένο αρχείο 3 μπορείτε να βρείτε και τις αλλαγές που έχουν προκύψει από την τελευταία υποβολή του Σχεδίου Προγράμματος Ανάπτυξης ΕΣΦΑ 2022-2031 στην Αρχή με το υπ’ αρίθμ. 139355/20.2.2022 του ΔΕΣΦΑ. Πιο συγκεκριμένα και σε απάντηση των σημείων που τίθενται στην υπ’ αριθμόν Ο-95300 επιστολή της ΡΑΕ, αναφέρονται τα ακόλουθα: 1

(1)Σταθμός Συμπίεσης στην Κομοτηνή : Ο ΔΕΣΦΑ λαμβάνοντας υπόψη τις ανάγκες της αγοράς καθώς και την ανάγκη ενίσχυσης των διακινούμενων ροών προς την Βουλγαρία μέσω του αγωγού IGB, προχώρησε στην αναθεώρηση του σχεδιασμού του συγκεκριμένου συμπιεστή αυξάνοντας την ισχύ του στα 12,5 MW, σε τρεις μονάδες, συμπεριλαμβανομένης της απαιτούμενης σχετικής λειτουργικής εφεδρείας, με δυνατότητα περαιτέρω επέκτασης ώστε να καλυφθούν τυχόν μελλοντικές ανάγκες της αγοράς για επαύξηση της διακινούμενης ποσότητας φυσικού αερίου. Σας πληροφορούμε ότι, σε ανταπόκριση της πρόσφατης πρόσκλησης του ENTSO-G, έχουμε ήδη υποβάλει αίτημα για την υπαγωγή της μελλοντικής επαύξησης της δυναμικότητας του συγκεκριμένου συμπιεστή έως τα 17 MW στο TYDP 2022.

(2)Έξοδοι Δυτικής Μακεδονίας: Σε συνέχεια του σχετικού αιτήματος για συγκριτική εξέταση έναντι της τροφοδοσίας των περιοχών της Πόρειας, του Περδίκκα και του Άσπρου μέσω του αγωγού ΤΑΡ, και έπειτα από ενδελεχή ανάλυση της οικονομικά αποτελεσματικότερης λύσης για την τροφοδοσία των συγκεκριμένων περιοχών, προτείνεται η τροφοδοσία των περιοχών με χρήση εγκαταστάσεων ΥΦΑ μικρής κλίμακας από το σταθμό φόρτωσης βυτιοφόρων στη Ρεβυθούσα. Στο Σχέδιο Προγράμματος Ανάπτυξης που επανυποβάλλουμε (Συν.1i & ii) έχει γίνει αναλυτική τεχνική περιγραφή η οποία θα εξειδικευτεί περαιτέρω κατά το στάδιο του λεπτομερούς σχεδιασμού των έργων. Στο Συν.4 εμπεριέχεται και η σχετική τεχνοοικονομική ανάλυση.

(3)Αγωγός προς τα Ιωάννινα : Για το έργο των Ιωαννίνων ο ΔΕΣΦΑ ήδη από το Σχέδιο Προγράμματος Ανάπτυξης 2022-2031 που είχε υποβληθεί στην Αρχή με την υπ’ αρίθμ. 139388/20.1.2022 επιστολή του ανέφερε ότι: «Ο ΔΕΣΦΑ εξετάζει την δυνατότητα τροφοδότησης της περιοχής μέσω εναλλακτικών λύσεων, οι οποίες περιλαμβάνουν συνδυασμό αγωγού και SSLNG με στόχο την επίτευξη αποδοτικότερης και ταχύτερης τροφοδοσίας της περιοχής. Λαμβάνοντας υπόψη το ανωτέρω αποτέλεσμα ο ΔΕΣΦΑ επιφυλάσσεται να επανέλθει στην ΡΑΕ για το εν λόγω έργο». Ο ΔΕΣΦΑ προχώρησε στην αξιολόγηση της τροφοδοσίας της περιοχής των Ιωαννίνων μέσω σχήματος εικονικού αγωγού (Συν.5). Τροποποιήσεις στο χρονοδιάγραμμα και στον προϋπολογισμού έργων τα οποία έχουν εγκριθεί σε προηγούμενα προγράμματα ανάπτυξης και προσθήκη νέων μικρών έργων: λαμβάνοντας υπόψη το διάστημα από την τελευταία υποβολή του Σχεδίου στην Αρχή έως και σήμερα και το συνεχιζόμενα μεταβαλλόμενο περιβάλλον, ο ΔΕΣΦΑ προχώρησε στην επικαιροποίηση του κόστους και του χρονοδιαγράμματος των έργων όπου αυτό κρίθηκε απαραίτητο. Στην Έκθεση Παρακολούθησης (Συν.2) έχουν επικαιροποιηθεί και αξιολογηθεί τυχόν αποκλίσεις στον προϋπολογισμό και στο χρονοδιάγραμμα υλοποίησης κάθε έργου, τεκμηριώνοντας τα μέτρα που έχει λάβει ο Διαχειριστής για την ανταπόκρισή του στο νέο χρονοδιάγραμμα. Τονίζεται ότι οι όποιες αποκλίσεις στο χρονοδιάγραμμα υλοποίησης των έργων δεν έχουν καμία επίπτωση στη ασφάλεια εφοδιασμού της Χώρας, καθώς είτε αφορούν σε περιοχές οι οποίες δεν τροφοδοτούνται ακόμη με φυσικό αέριο, είτε αφορούν σε υποδομές εξαγωγής φυσικού αερίου προς γειτονικές χώρες, οπότε δεν έχουν κανένα αρνητικό αντίκτυπο στην τροφοδοσία του φυσικού αερίου της Ελλάδος. Ταυτόχρονα, 2 εντάχθηκαν προς έγκριση νέα μικρά έργα τα οποία προέκυψαν στο προαναφερθέν διάστημα και των οποίων η υλοποίηση είναι απαραίτητο να γίνει άμεσα. Κατόπιν των ανωτέρω, σας επανυποβάλλουμε το Σχέδιο Προγράμματος Ανάπτυξης ΕΣΦΑ 2022-2031 στα ελληνικά και αγγλικά (Συν. 1 ) σύμφωνα με τα οριζόμενα στο άρθρο 14 του Ν. 4001/2011 και παρακαλούμε για τις ενέργειές σας. Είμαστε στη διάθεσή σας για οποιαδήποτε σχετική διευκρίνιση και περαιτέρω συνεργασία. Dear Mr. President, Further to the Authority's letter of 17.06.2022 (Ref. 1), we resubmit the Draft National Natural Gas System’s Development Plan 2022-2031 considering your comments and remarks as reflected in the above-mentioned letter. In the attached file 3 you may also find the amendments that have occurred since the last submission of DESFA’s Draft NNGS Development Plan 2022-2031 to the Authority (No 139355/20.2.2022). More specifically and in response to the points presented in RAE’s letter O-95300, the following are indicated:

(2)Compression station in Komotini: DESFA, considering the needs of the market and the need for the increase of the flows to Bulgaria via the IGB pipeline, proceeded with the reassessment of the design of the compressor station concerned, by increasing its capacity to 12,5 MW, with three units, including the required operating reserve, with the possibility for further expansion to meet the future needs of the market for increased quantities of natural gas transported. We inform you that, in response to a recent invitation of ENTSO-G, we have already submitted a request for the inclusion of the future incremental capacity of this specific compression station, up to 17 MW, in the TYDP 2022. West Macedonia exit points: Further to RAE’s request for a comparative assessment of the upstream supply solutions of the regions of Poria, Perdikas, and Aspros via TAP, and following a thorough analysis of the most cost-efficient supply solution for the specific regions, it is proposed to supply the regions with small scale LNG from the truck loading facility of Revithoussa. In the Draft TYDP, that we resubmit (Att. 1i & ii) a detailed technical description has been included which will be further analysed during the detailed design phase of the projects. In Att. 4 the corresponding techno-economic analysis is included, as well.

(3)Pipeline to Ioannina: For Ioannina project DESFA has already indicated, in the Draft Development Plan 2022-2031 submitted to the Authority with the letter No. 139388/20.1.2022, the following: 3 “DESFA is examining the feasibility of supplying regions with alternative solutions, which shall include a combination of pipeline and ssLNG with the aim to achieve a more efficient and timely supply of the region. Considering the abovementioned result, DESFA reserves the right to reconvene with RAE for the aforementioned project”. DESFA proceeded with the assessment of the supply of the region of Ioannina via a virtual pipeline concept (Att. 5). Amendments in the timeline and the budget of the projects, that have already been included in previous Development Plans and addition of new small projects: considering the time that has elapsed from the submission of the draft TYDP to the Authority till today and the continuously evolving environment, DESFA has proceeded with the update of the budget and the timeline of projects, where deemed necessary. In the Monitoring Report (Att. 2) such deviations in the budget and the timeline of each project have been updated and assessed, while justifying the measures that the TSO has taken for the abidance with the new timeline. It is stressed that possible deviations in the implementation timeline of the projects have no impact in the security of supply of the country, since either refer to regions not currently supplied with natural gas, or to natural gas export infrastructure to neighboring countries, consequently they have no negative impact to natural gas supply in Greece. In addition, new small projects, which emerged during the above-mentioned period and whose prompt implementation is necessary, were included for approval. In the light of the above, we re-submit the Draft NNGS Development Plan 2022-2031 to you in the Greek and English language (Att. 1) pursuant to Article 14 of the Law 4001/2011, and we would like to ask for your action. We are at your disposal for any relevant clarification and further cooperation. Με εκτίμηση Yours sincerely Maria Rita Galli Ανώτατη Εκτελεστική Διευθύντρια Chief Executive Officer 4 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 July 2022 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Contents ABBREVIATIONS......................................................................................................................... 6 Executive Summary ................................................................................................................... 7 Chapter I. Introduction .............................................................................................................. 9 Chapter IΙ. Projects included in the three years’ Development Period ................................... 13 Α. New Projects ................................................................................................................... 13 Α

1. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects) ................................................................................... 13 Α
2. Projects for the connection of Users............................................................................. 13 Α
3. Development Projects: Expansion of NNGS to new areas connected to distribution network ............................................................................................................................... 13
4. Supply of Ioannina via SSLNG .................................................................................. 14
5. M/R Station to Veroia.............................................................................................. 16
6. M/R Station to Naousa ............................................................................................ 16 A
7. Development Projects: Expansion of NNGS to new markets ....................................... 17 Α
8. Development Projects: Increase of capacity & security of supply of NNGS ................. 17 Α
9. Development Projects: Improvement / modernization/ maintenance of NNGS ......... 18
10. Expansion and Upgrade of M/R Stations of Exit Point to Distribution Network ‘Athens’............................................................................................................................ 18
11. Keratsini branch rerouting (Mavri Ora stream) ....................................................... 20
12. Construction of a new Metering & Regulating Station in Markopoulo Site to replace the existing temporary M/R ............................................................................................ 21
13. Electronic Information System (EIS)- functionalities upgrade ................................ 22
14. Development of an Information System for DESFA to undertake the role of forecasting party for the NNGTS Balancing Zone ............................................................ 23
15. New electronic information system for natural gas ................................................ 24
16. New project management system .......................................................................... 25
17. Upgrade of Fire Fighting System & replacement of the pressure relief valves at BMS Sidirokastro...................................................................................................................... 26
18. Nitrogen Injection System ....................................................................................... 27
19. Overhaul maintenance of the two

(2)BOG Compressors V-3101 A & V-3101 B .... 28

1. Overhaul maintenance of GE 1 Unit of CHP Plant ................................................... 29
2. LNG Upgrade Projects 2022..................................................................................... 30
3. Transmission Upgrade Projects ............................................................................... 31 2 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
4. Replacement of Telecommunication and Network Equipment in NNGS Fixed Telecommunication System ............................................................................................ 32
5. Nea Messimvria M/R Station modifications for Reverse Flow Operation .............. 33
6. Relocation of Ampelia – Karditsa – Trikala Pipeline ................................................ 33
7. Anti-Flood works and Damage Restoration in the Ampelia Station ........................ 34 Α
8. Incremental Capacity Projects according to CAM NC ................................................... 35 Α
9. Impact of the Development projects in the Average Tariff for the Use of the system of NNGS ................................................................................................................................... 35 Β. Planned Projects ............................................................................................................. 36 Β
10. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects) ................................................................................... 36
11. Pipeline Nea Messimvria – Evzoni/ Gevgelija and Metering Station ...................... 36
12. Connection with the FSRU of Alexandroupolis ....................................................... 38
13. Metering and Regulating Station for connecting with Dioryga Gas FSRU............... 39 Β
14. Projects for the connection of Users ............................................................................. 40
15. M station at SALFA A. Liossia ................................................................................... 40
16. M/R station AdG III .................................................................................................. 41
17. Connection of Energean Oil & Gas S.A. plant with NNGTS ..................................... 42
18. Metering station at Agios Nikolaos Viotia (AdG IV)................................................. 43
19. Connection of ELVAL plant to the NNGTS in Inofyta ............................................... 43
20. Connection with TERNA Power Plant to the NNGTS ............................................... 44
21. Connection with ELPEDISON Power Plant to the NNTGS ........................................ 45 Β
22. Development Projects: Expansion of NNGS to new areas connected to distribution network ............................................................................................................................... 46 B.3.
23. Supply of West Macedonia ....................................................................................... 46
24. SSLNG infrastructure to supply the regions of Poria, Aspros & Perdikas ................ 46
25. High Pressure pipeline to West Macedonia ............................................................ 48
26. M/R Station in the region of Aspros ........................................................................ 49
27. M/R Station in the region of Perdikas Eordeas ....................................................... 50 B.3.
28. Supply of Western Greece & Peloponnese ............................................................... 50
29. High Pressure Pipeline to Patras ............................................................................. 50
30. Korinthos M/R city gate station............................................................................... 52
31. Argos/Nafplio M/R city gate station ........................................................................ 52
32. Tripoli M/R city gate station .................................................................................... 53 B.3.
33. Supply of Central Macedonia .................................................................................... 54 3 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
34. Drymos/Liti M/R city gate station ........................................................................... 54 B.3.
35. Supply of other areas ................................................................................................ 55
36. Metering / Regulating Station Livadia U-2710 ........................................................ 55 Β
37. Development Projects: Expansion of NNGS to new markets ....................................... 56
38. Truck Loading Pilot (first) Station ............................................................................ 56
39. New jetty for small-scale LNG in Revithoussa ......................................................... 57 Β
40. Development Projects: Increase of capacity & security of supply of NNGS ................. 58
41. Compression Station in Komotini and Regulating Station ...................................... 58
42. Compressor Station in Ambelia ............................................................................... 60
43. Upgrade of Nea Messimvria compressor station .................................................... 61
44. Booster Compressor for TAP in Nea Messimvria .................................................... 62 B
45. Development Projects: Improvement / modernization/ maintenance of NNGS.......... 63
46. Design, supply and installation of a daily gas flow system design .......................... 63
47. LNG Terminal Boil-off Gas Compressor Station....................................................... 64
48. Upgrading Projects of NNGS -3rd group.................................................................. 65
49. Upgrade of physical security of DESFA facilities - Physical Security Control Center 66
50. Replacement of Metering and Supervision/ Control systems at NNGTS M and M/R stations of NNGTS............................................................................................................ 67
51. New building for DESFA’s headquarters.................................................................. 68
52. Technical Training Centre in Nea Messimvria ......................................................... 69
53. NNGS Modernization projects – 4th compilation ................................................... 70
54. Upgrade of LNG and O&M Facilities for energy saving ........................................... 71
55. Cathodic Corrosion Protection System Upgrading .................................................. 72
56. IT Transformation .................................................................................................... 73
57. Upgrade of LNG Facilities ........................................................................................ 74
58. LNG Maintenance Projects ...................................................................................... 75
59. Upgrade of Control and Dispatching Center in Patima ........................................... 76
60. Asset management IT & OT Equipment .................................................................. 77
61. Required O&M Equipment for 2022 ....................................................................... 78 Chapter III. Projects outside the three years Development Period ........................................ 79 Α. New Projects ................................................................................................................... 79 Α
62. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects) ................................................................................... 79
63. 4 Metering and Regulating Station for the connection to East Med Pipeline ........... 79 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Α
64. Projects for the connection of Users............................................................................. 80 Α
65. Development Projects ................................................................................................... 80 Β. Planned Projects ............................................................................................................ 80 Β
66. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects) ................................................................................... 80
67. Metering and Regulating Station for connecting South Kavala underground storage 80 Β
68. Projects for the connection of Users ............................................................................. 81
69. Construction of High Pressure Pipeline Mavromati (Vagia)-Larymna and necessary Metering Station for the Connection of LARCO GMM SA with NNGS ............................ 81 Β
70. Development Projects ................................................................................................... 82 Chapter IV. Planned projects that are not included or were completed in the Development Plan 2022-2031 ........................................................................................................................ 82 Annex I ..................................................................................................................................... 84 5 ABBREVIATIONS BMS: Border Metering Station CCTV: Closed Circuit Television CHP: Combined Heat and Power unit CNG: Compressed Natural Gas DESFA: TSO of the Greek Natural Gas System EIB: European Investment Bank HP: High Pressure IGB: Interconnector Greece Bulgaria IISNG: Integrated IT System for Natural Gas L/V: Linevalve LNG: Liquefied Natural Gas M/R: Metering/Regulating NNGS: National Natural Gas System NNGTS: National Natural Gas Transmission System NSRF or PA: National Strategic Reference Framework or Partnership Agreement 7-year E.U. program for the support of the Greek economy O&M Centers: Centers of Operation and Maintenance PLC: Programmable Logic Controller RAB: Regulated Asset Base RAE: Regulatory Authority of Energy RRF: E.U. Recovery and Resilience Facility SCADA: Supervisory Control and Data Acquisition TAP: Trans Adriatic Pipeline TSO: Transmission System Operator Νm3: Normal Cubic meter UGS: Underground Storage Executive Summary According to the current provisions of the Network Code, DESFA as the TSO of the National Natural Gas System (NNGS) prepares on a yearly basis, and puts in public consultation to all relevant stakeholders, the Draft Ten Year Development Plan (TYDP). Aim of this document is to inform the market participants on the infrastructure- new and planned-that DESFA is currently materializing. The new proposed Development Plan 2022-2031 includes projects with a forecasted budget of approximately € 856 million, from which an amount of €126,7 million corresponds to new projects, while the rest correspond to the ones already approved in the TYDP 2021-2030, as updated in terms of timeline and budget
71. From these new projects, €92 million correspond to expansions to new areas, with the main one being the expansion of the gas infrastructure to Ioannina, and 27,2 million € to improvements, modernization, and maintenance of NNGS. From those, 5,5 million € refer to IT projects aiming at the digitalization of DESFA and its IT transformation in five key areas :1) managing business, 2) managing assets, 3) managing data and continuity, 4) facilitating customer relationships & communication & 5) supporting enterprise intelligence. The present Development Plan does not include yet any major project related to the energy transition of the Greek energy sector and the decarbonization process, however, relevant work of DESFA is under development and will be further deployed in the immediate future, as necessary, revising the DESFA’s TYDP. In addition, following the Repower EU initiative of the European Commission, DESFA has already proposed three major projects to be included in the relevant initiative, the further upgrade of the CS Komotini, the procurement of an FSU for the permanent upgrade of the storage capacity in Revithoussa, as well as the overall upgrade of the NNGS, with a H2-ready set of pipelines and other required components, with the view to accommodate the increased flows of natural and renewable gases through Greece, also for the neighboring countries and the corresponding new infrastructure connections to the NGTS. The results of the corresponding assessment will be incorporated in the TYDP in the future. The following graphs include in summary the analysis of the total budget of this draft TYDP, in relation to:
72. The project types
73. The FID date
74. The expected commissioning year 1 As far as the updated budget is concerned, a total increase of appr. 196 million € is observed, compared to the already approved TYDP, reflecting the most recent update in steel prices and the more detailed estimation of CAPEX as projects mature. Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 8 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Chapter I. Introduction The Development Plan 2022-2031 is conducted in accordance with applicable legislation namely article 14 of L. 4001/2011 and applicable provisions of the NNGS Network code. As per the provisions of the legislation, for the preparation of the Development Plan, following parameters are taken into account: a) data of the current and the estimated supply and demand of natural gas b) the fulfillment of obligations to provide public utility services and gas supply security, aiming at the continuity of supply and prevention of congestions and of refusal of access for new users, in a reliable and economically efficient manner c) the continuous improvement of the NNGS safety, reliability and efficiency, aiming at the prevention of incidents, failures and emergencies, in a reliable and economically efficient manner d) the supply of new areas with natural gas and the ensuring of new Users’ potential access e) the protection of the environment, also by expanding the use of natural gas as an alternative, cleaner and more sustainable fuel, among others, in maritime and road transportation f) the European development plan and the regional investment programs in accordance with the provisions of part (b) of paragraph 3 of Article 8 and of paragraph 1 of Article 12 of Regulation 715/2009 g) the viability of projects that are included in the Plan and their potential financing h) the ongoing developments regarding the system’s readiness to accept H2 and other renewable gases volumes, in compliance with EU Green Deal requirements. 9 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 The Development Plan includes projects whose construction is scheduled to begin within the timeframe of the Plan (i.e., for the period 2022-2031) as well as the Planned Projects whose construction has not been completed yet. The TSO substantiates the rationale of the inclusion of the new projects in the Development Plan and includes information about the construction method, the estimated budget, the time schedule of the implementation, the way of financing the relevant investments as well as the cost recovery method. In the following paragraphs the projects of the Development Plan 2022-2031 are presented, including for each project all the necessary elements arising from the Network Code for the regulation of NNGS. The Development Plan is structured as follows: Chapter I : Introduction Chapter II. Projects included in the three years Development Period (namely 2022-2024) A. New Projects
75. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects)
76. Projects for the connection of Users
77. Development Projects: Expansion of NNGTS to new areas connected to distribution network
78. Development Projects: Expansion of NNGS to new markets
79. Development Projects: Increase of capacity & security of supply of NNGS
80. Development Projects: Improvement / modernization/ maintenance of NNGS
81. Incremental Capacity Projects according to CAM NC B. Planned Projects2
82. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects)
83. Projects for the connection of Users
84. Development Projects: Expansion of NNGS to new areas connected to distribution network
85. Development Projects: Expansion of NNGS to new markets
86. Development Projects: Increase of capacity & security of supply of NNGS
87. Development Projects: Improvement / modernization/ maintenance of NNGS Chapter III. Projects outside the three years Development Period A. New Projects
88. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects)
89. Projects for the connection of Users
90. Development Projects 2 Planned Projects are the projects already included in any of the previous TYDPs or to the List of Small Projects but are not yet concluded 10 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 B. Planned Projects
91. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects)
92. Projects for the connection of Users
93. Development Projects Chapter IV. Projects that have been removed from the Development Plan 2022-2031 DESFA also provides justification and reasons for deviations or exclusion from the proposed draft Development Plan of any Planned Project. It is mentioned at this point that according to Article 5A par. 8 of the Tariff Regulation (RAE Decision 1434/2020), the Development Projects that are defined as Projects of Major Importance are eligible for an increased return. For each project a Table similar to the template below, summarizes the main elements of the project, as presented below: ▪ ▪ the type of project (Planned or New/ Development or Connection) the type of investment (pipeline, compressor station, metering station, LNG and smallscale LNG facilities, CNG facilities, including all related plants, machineries, devices, equipment and systems for process monitoring/supervision/control/management and ancillary facilities such as consolidation/protection works, service roads, buildings, offices, IT systems, etc.) ▪ the expected benefit (according to the criteria of art. 92 par. 2 of NNGS Network Code) ▪ the current status: - under preliminary study, which includes preliminary market analysis, dimensioning and cost estimation that will allow the definition of the project for approval by RAE - under maturity, which includes basic design study, environmental authorization, that is all the actions from approval by RAE up to the Final Investment Decision (i.e. Resolution to Construct) according to the definition of the NNGS Administration Code - under construction, which includes the detailed design, procurement of materials and construction of the project as well as any tests following mechanical completion, that are all the actions from the Final Investment Decision (i.e. Resolution to Construct) and up to inclusion of the project in the system ▪ the project milestone dates: - the start date, which is the first inclusion of the project to the Development Plan or List of Small Projects - the date of Final Investment Decision, as this term described in the NNGS Network Code, i.e. “the approval decision for the implementation of the project by the Operator without technical, commercial or financial conditions. The FID is taken after (a) the approval of the Development Plan or the publication of the Small Projects List, in which it is included, (b) the execution of Connection Agreement for the Connection Projects, (c) the financing decisions, at least in relation to own capital and grants and (d) the approval of Environmental Terms. Contracts for procurement of materials and 11 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 construction of projects are executed by the Operator after the taking of the FID” (art. 1 par. 78 of the Network Code). the estimated Operation Date, as described in the NNGS Network Code, which is the starting date of operation (for testing if necessary) after the mechanical completion of the project - the scheduled day for Entry into System, which is the start of normal operation (or Commercial Operation Date). Entry of a project into the system is performed after the issuance of operation license, where relevant. the current budget of the project, as well as the part of which is considered maintenance capex. Maintenance capex is considered to be any addition to or replacement of existing NNGS assets in order the latter to be maintained in their initial operational capability as long as possible. for new projects their impact on the Average NNGS Tariff is calculated, as described and provided for in the Tariff Regulation the financing plan and the recovery method of the investment whether a commitment with a User has been made for booking of Transmission Capacity for a certain period of time whether the project is part of the three-year Development Period provided for in the respective NNGS Network Code. This period includes projects for which the final Investment Decision (i) has been taken, or (ii) is considered possible to be taken within three

(3)years from the publication of the draft Development Plan in DESFA’s website (i.e. up to October 2024). For projects not included in the 3-year Development Period, no planning is given. ▪ ▪ ▪ ▪ ▪ Project Summary Type of project Type of investment Current Budget of which Maintenance Capex Expected benefit Start date Final Investment Decision Operation Date Entry in the system Current Status of Project Financing plan Recovery method 12 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Connection Agreement with User Impact on the Average Tariff for the use of NNGS (for “New” projects only) Inclusion in the 3 years Development Period First approval from RAE (for Planned Projects) Following the project summary of each project, a short description of the scope of it and any other necessary relevant information is given. Chapter IΙ. Projects included in the three years’ Development Period Α. New Projects Α

1. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects) This chapter presents projects (could be either Development or Connection projects) that aim to interconnect the NNGTS with other natural gas systems (UGS facilities, LNG or FSRU, high pressure pipelines etc.) promoted by others. Currently there are no such projects included in the TYDP 2022-
2. Α
3. Projects for the connection of Users This chapter presents projects that are a result of the acceptance by DESFA of an Application for Advanced Reservation Capacity Allocation submitted by a User according to the procedure described in Article 95Β of the Network Code. No new connection projects are proposed in this TYDP. Α
4. Development Projects: Expansion of NNGS to new areas connected to distribution network This chapter presents projects that aim to expand the transmission system to new areas and interconnect with the distribution network promoted by the relevant DSO in the area. Three

(3)projects are proposed with a total budget of 92 million €. 13 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031

1. Supply of Ioannina via SSLNG Project Summary Type of project New Project Type of investment ssLNG infrastructure Current Budget 85 million € Expected benefit The supply of new areas with natural gas ensuring potential access to new Users Start date July 2022 Final Investment Decision July 2023 Operation Date June 2026 Entry into the system September 2026 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Additional Services Impact on the Average Tariff 2,95%3 for the use of NNGS Inclusion in the 3 years Yes Development Period The main aim of the project is to introduce gas to the city of Ioannina, but also, in the future, other major cities, industrial and agricultural premises in the area of Epirus, West Macedonia, as well as the neighboring countries, which have no gas at the moment. Following a comparative analysis between supply of natural gas with a pipeline - - and that through ssLNG, as also requested by RAE, DESFA proposes to proceed with the a small scale LNG (SSLNG) solution. Epirus (capital: Ioannina), with a total area of 9,203 km2 and a population of 333,696 inhabitants in 2019 (Eurostat, 2020), is positioned at the north-western part of Greece and it is mostly an alpine region. However, recent infrastructure projects -e.g., Egnatia Odos, Ionia Odos and the forthcoming privatization of the port of Igoumenitsa, which is one of the major transit ports to Europe- a growing tourism, services and agricultural sectors, a dynamic academic environment (University of Ioannina and Technological Educational Institute of Epirus) and the strengthening of traditional industries are gradually transforming the region. The City of Ioannina is located at almost 60 km from Igoumenitsa port. The area is not served yet by natural gas infrastructure. In addition to Ioannina, also other major cities (Arta and 3 For the calculation of the impact on the average tariff only the consumption of the city of Ioannina has been taken into account and not the surrounding areas, which might be substantial. 14 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Preveza) would see the evolution of their economy requiring developing the natural gas infrastructure. In addition to the development of a high-pressure pipeline stemming from the corresponding pipeline of West Macedonia, DESFA has assessed the alternative of supplying the region of Epirus through a virtual pipeline based on a SSLNG supply chain. Based on a comparative analysis of the corresponding costs it is proven that the option for the supply of Ioannina through SSLNG is the most cost efficient one. To develop the LNG / NG infrastructure in the region DESFA has identified that the most technically, economically and timely efficient solution, is the supply through ssLNG installations, leveraging on its experience in managing the LNG terminal in Revithoussa island from which the LNG will be supplied to the Epirus region. In order to satisfy the Ioannina consumption, it has been foreseen to supply LNG to the north of Greece via LNG carrier, it follows that a dock or a jetty will be needed as well as a small installation with LNG unloading and storage facility at Igoumenitsa area. The supply of LNG to Ioannina and eventually surrounding cities will be then organized via truck. A modular installation strategy will be applied as construction approach to stagger the project phases following the natural gas consumption increase. Figure 1: Supply chain of LNG to Ioannina Igoumenitsa Area: The LNG will be transferred to the port of Igoumenitsa via a small scale LNG vessel where it will be unloaded to specific storage facilities. A jetty will also be required to accommodate the carrier and unload LNG from the LNG carrier to the storage facilities. The jetty will be adjacent to the Igoumenitsa port area. In order to proceed from Storage tank to the supply of Ioannina, a truck loading skid is required to meet the maximum consumption per day capacity. Ioannina Area: A Truck unloading skid is required to receive LNG at the Ioannina Storage and regassification hub. No spare Truck loading skid has been considered as the LNG Storage has been sized to accommodate approximately 2 days of additional peak volume for the Ioannina city consumption. Apart from a storage facility in Ioannina a regasifier and a metering equipment is also required. The aforementioned design is preliminary and will be finalized at the time of basic engineering design. 15 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
2. M/R Station to Veroia Project Summary Type of project New Project Type of investment M/R Station Current Budget 3,5 million € Expected benefit the supply of new areas with natural gas and the ensuring of new Users’ potential access Start date October 2021 Final Investment Decision July 2022 Operation Date June 2024 Entry into the system Sep 2024 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of -0,02% NNGS Inclusion in the 3 years Development Period Yes The purpose of the project is the installation of a Metering/Regulating Station (along with the necessary building facilities and supporting equipment) at the extended area of Veroia for the supply with natural gas. The M/R station will be connected to the 10’’ branch Arsenio-Veroia which is part of theHPP to West Macedonia (already planned project) upstream and downstream with the expected distribution network of DEDA. The M/R Station will be designed with an initial capacity of 8.000 Nm3/h and outlet pressure of 16,7 barg, (8.000 Nm3/h, configuration 1+1 – one metering/regulating stream in operation and one stand-by), with future provision for expansion to max capacity of 16.000 Nm3/h, when this will be justified demand-wise by the downstream connected system. The project is designed to be 100% H2 ready.
3. M/R Station to Naousa Project Summary Type of project 16 New Project Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Type of investment Metering & Regulating Station Current Budget 3,5 million € Expected benefit the supply of new areas with natural gas and the ensuring of new Users’ potential access Start date October 2021 Final Investment Decision July 2022 Operation Date June 2024 Entry in the system September 2024 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of 0,05% NNGS Inclusion in the 3 years Development Period Yes This new M/R Station U-9130 concerns the installation of a Metering/Regulating Station at the Kopanos area of Νaousa for the supply with natural gas. The M/R station will be fed through LVS U-9120 of the 10“branch Arsenio-Veria, which is part of the 30’’ HHP to West Macedonia. The M/R Station will be designed with a total capacity of 6.000Nm 3/h and outlet pressure of 16,7 barg, (6.000 Nm3/h, configuration 1+1 – one metering/regulating stream in operation and one stand-by), including as well as skid shelter, Control Room and RCC building Station and supporting equipment. The project is designed to be 100% H2 ready. A
4. Development Projects: Expansion of NNGS to new markets This chapter presents projects that aim to expand the transmission system to new markets related to regulated opportunities such as the expansion to new areas through virtual pipelines etc. Currently, there are no projects in this section. Α
5. Development Projects: Increase of capacity & security of supply of NNGS This chapter includes projects that aim to increase capacity and enhance the security of supply of NNGS. Currently, there are no projects in this section. 17 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Α
6. Development Projects: Improvement / modernization/ maintenance of NNGS This chapter presents projects –mainly small capital ones- that aim to the continuous improvement of the NNGS, its modernization and maintenance to ensure safety, reliability and efficiency. Seventeen

(17)projects are proposed with a total budget of 27,2 million €. 1. Expansion and Upgrade of M/R Stations of Exit Point to Distribution Network ‘Athens’ Project Summary Type of project New Project Type of investment M/R equipment Current Budget 3,0 million € Expected benefit Improvements to the efficiency and effectiveness of the NNGS Start date October 2021 Final Investment Decision July 2022 Operation Date December 2023 Entry into the system March 2024 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of 0,03% NNGS Inclusion in the 3 years Development Period 18 Yes Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 The Exit Point to Distribution Network ‘ATHENS’ is served by the Metering/Regulating Stations ‘ATHENS NORTH’, ‘ATHENS EAST’, ‘ATHENS WEST’) and ‘THRIASSIO’ as shown on the map below. Figure 2 : Overview of exit point to Athens The first three

(3)Metering/Regulating Stations were designed to be installed in two phases. The first phase, which has been implemented, includes the installation of two

(2)metering/regulating lines (one in operation and one in standby mode), while the second phase provides for the installation of additional metering/regulating lines in such a way that one line will be in standby mode. Since the maximum capacity of the first phase in the Metering/Regulating Stations ‘ATHENS NORTH’ and ‘ATHENS EAST’ has already been used in peak loads during the last winter seasons and considering the expected increase in Natural Gas consumption in the domestic sector, in the coming years (appr. 40% between 2022 and 2031), due to the new connections that are planned to be made by the Distribution Network Operator, it is deemed necessary to upgrade the four Metering/Regulating Stations that serve the Exit Point to Distribution Network ‘ATHENS’, as follows: 19

1. Detailed engineering, procurement and construction of additional Metering/Regulating lines at the M/R stations ‘ATHENS NORTH’ and ATHENS EAST’ to the existing stub outs, including all the attached electrical and electronic equipment, with the aim of securing the supply of Natural Gas in the greater Athens area. Stations’ existing capacity of 110.219 Nm3/h will be upgraded to 269.862 Nm3/h in order to ensure the supply to the Exit Point to Distribution Network ‘Athens’ in peak hourly loads in the next winter periods.
2. Installation of flow control valves at the four

(4)Metering/Regulating Stations at the Exit Point to Distribution Network ‘ATHENS’ with the aim of optimizing the control of allocation of Natural Gas flow among them – especially in periods of high demand for Natural Gas – by the Control & Dispatching Center of DESFA. Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 The Project aims to improve the smooth operation of the NNGTS in servicing an Exit Point connected to the Distribution Network and at the same time servicing the expected increase in Natural Gas consumption in the domestic sector. The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures. 2. Keratsini branch rerouting (Mavri Ora stream) Project Summary Type of project New Project Type of investment Construction works for branch rerouting Current Budget 0,425 million € Expected benefit Protection of the environment Start date October 2021 Final Investment Decision July 2022 Operation Date June 2024 Entry into the system June 2024 Current Status of Project Under maturity Financing plan The project will be reimbursed by the Region of Attica Recovery method Impact on the Average Tariff for the use 0% of NNGS Inclusion in the 3 years Development Yes Period The Scope of this Project is to perform all the necessary actions for rerouting part of Keratsini branch 24’’ at Aspropyrgos Attica to enable construction works for channel improvement of Mavri Ora stream. The Project is undertaken for compliance with a request raised by the Region of Attica due to necessary flood-defense works. The Project aims to facilitate a public service requirement (construction works for channel improvement of Mavri Ora stream). 20 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 3. Construction of a new Metering & Regulating Station in Markopoulo Site to replace the existing temporary M/R Project Summary Type of project New Project Type of investment M/R Station Current Budget 2,2 million € Expected benefit Improvements to the effectiveness of the NNGS Start date October 2021 Final Investment Decision July 2022 Operation Date December 2023 Entry into the system March 2024 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services efficiency and Impact on the Average Tariff for the 0,03% use of NNGS Inclusion in the 3 years Development Yes Period The Exit Point "SPATA" is supplied by Metering / Regulating Station "MARKOPOULO", which is served by the temporary station TM2. Since the Metering / Regulating Station TM2 is a temporary and portable installation (compact), it does not support all the functions and redundancies provisioned for the Metering Regulating Stations of NNGTS. Therefore, it is deemed necessary to build a new fully operational Metering / Regulating Station based on the applicable specifications of the company. The new station can be installed on the SE side of the available plot considering the requirements of the legislation in force and any modifications required. The station’s final capacity will be 28.800 Nm3/h in a configuration of (2+1) - two metering/regulating streams in operation and one stand-by, with each stream’s capacity of 14.400 Nm3/h. The Project aims to improve the smooth operation of the NNGTS in servicing an Exit Point connected to the Distribution Network. The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures. 21 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 4. Electronic Information System (EIS)- functionalities upgrade Project Summary Type of project New Project Type of investment IT System Current Budget 0,35 million € Expected benefit Ensure high quality offered services Start date October 2021 Final Investment Decision July 2022 Operation Date December 2022 Entry into the system December 2022 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission and LNG Services Impact on the Average Tariff for the use 0% of NNGS Inclusion in the 3 years Development Yes Period DESFA is required to update the existing commercial IT system (EIS) to be able to provide new services and products and to comply with regulatory changes triggered either by the market or internally by DESFA to improve the level of services already offered. Most notable examples for 2022 are: - Introduction of Small-Scale LNG Truck Loading Services - Interconnection with IGB and offering of new relevant capacity products at said Interconnection Point - Balancing Regime overhaul with the introduction of Commercial Balancing - Expansion of secondary market flexibility by redesigning the regime in force and integrating such transactions with PRISMA Platform (requires new interfaces between EIS and PRISMA). - 7th Code revision The project concerns the upgrade of DESFA EIS to ensure high quality of offered services through an integrated electronic environment, as provided for in the Network Code, as in force. 22 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 5. Development of an Information System for DESFA to undertake the role of forecasting party for the NNGTS Balancing Zone Project Summary Type of project New Project Type of investment IT System Current Budget 0,50 million € Expected benefit Necessary for the balancing forecasting /Enhance the role of Network Users in the NGTS balancing activity and enable them to manage their balancing portfolio more efficiently Start date October 2021 Final Investment Decision July 2022 Operation Date October 2022 Entry into the system October 2022 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the 0% use of NNGS Inclusion in the 3 years Yes Development Period According to Decision 70/2020 of the Regulatory Authority for Energy (Government Gazette Β’ 473/08.02.2021) DESFA is assigned the role of the Forecasting Party for the Balancing Zone of Greece, according to paragraph 5 of Article 39 of the COMMISSION REGULATION (EU) No 312/2014. This role foresees that DESFA is to calculate and publish daily forecasts of the Network User’s inputs and outputs (entry & exit allocated quantities), particularly for Network Points where there is no hourly or daily measurement of the end customers’ consumption (non-daily metered flows). To this end, DESFA must develop an information system that will collect all required data for

1. a)DESFA’ s other IT systems (Commercial Electronic Information System & Asset Management Gas Demand Forecast system) and
2. b)Distribution System Operators (DSOs), which will be used in conjunction with advanced predictive models to produce the required forecasts, which will be afterwards published to inform the Network Users. The project will enable DESFA to fully comply with the Regulator’s mandate, which stems from the provision of EU legislation (BAL NC). Also, it will greatly enhance the role of Network Users in the NGTS balancing activity and enable them to manage their balancing portfolio more efficiently. This fact is also expected to decrease DESFA’s overall balancing, also 23 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 increasing the use of the trading platform. Finally, there will be incentives tied with the forecasting accuracy which will enable DESFA to potentially gain value out of the project. 6. New electronic information system for natural gas Project Summary Type of project New Project Type of investment IT System Current Budget 3,50 million € Expected benefit Ensure high quality offered services Start date October 2021 Final Investment Decision July 2022 Operation Date December 2023 Entry into the system December 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission and LNG Services Impact on the Average Tariff for the use of 0,05% NNGS Inclusion in the 3 years Development Period Yes DESFA is required to migrate to a new commercial IT system (EIS) to: i. secure the smooth operation and the business continuity of such an important system provided that the existing system is a transitional solution, built to satisfy the imminent need to implement the (mandatory) EU legislation provisions in 2016 (indicatively, CAM Capacity Auctions, Interconnection Agreement with Bulgarian TSO, renominations, etc.). Furthermore, it is fully custom developed and supported by a very small company. On top of structural issues, lack of expandability and low responsiveness increase the Operational Risks at the highest levels ii. 24 be able to provide new services and products and to comply with regulatory changes triggered either by the market or internally by DESFA to improve the level of services already offered. Most notable examples for 2022 are: - Introduction of Small-Scale LNG Truck Loading Services and Small-Scale LNG Jetty - Balancing Regime overhaul with the introduction of Commercial Balancing Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Expansion of secondary market flexibility by redesigning the regime in force and integrating such transactions with PRISMA Platform (requires new interfaces with PRISMA) Although there is some overlap of the items mentioned in ii. above with the project “Electronic Information System - functionalities upgrade”, the reason is that, as at least some aspects of these new services will start to be offered in 2022, where the new system will not be ready, some upgrades are required to the existing one to be able to support them. The upgrade project is meant as bridge solution, until the time of completion of the new system, which will cover all new and existing services. - 7. New project management system Project Summary Type of project New Project Type of investment IT System Current Budget 1,20 million € Expected benefit Ensure high quality offered services Start date October 2021 Final Investment Decision July 2022 Operation Date December 2022 Entry into the system December 2022 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission & LNG Services Impact on the Average Tariff for the use of 0,01% NNGS Inclusion in the 3 years Development Period Yes DESFA has a leading project management environment, which has been operating smoothly for the last 15 years. This environment, which was designed and implemented according to the global standard PMBOK 7.0 of PMI, allowed the successful implementation of DESFA's complex projects. The Project Management Integrated Information system plays a vital role in this environment. Desfa requested for the Project Management Integrated Information system's operating system to change how it worked to be fully compatible with the central ERP system SAP4HANA. An advanced dynamic data exchange process was also developed. As new needs derived by DESFA next decade's TYDP program, DESFA wants to - Re-evaluate the state of the environment created. 25 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 - Consider complementary technological solutions offered by the international industry that could improve it, through a process of obtaining well-defined consulting services and searching for the relevant market. - Implement any necessary steps concerning new complementary IT solutions. These solutions should be fully integrated with the current PM information systems, compatible with DESFA Projects Management Environment and able to provide further services for CAPEX Monitoring of all the categories of Projects (IT, Maintenance, Development, etc.) The implementation of the final solution should, in any case, ensure - that DESFA will continue to have a top project management environment, - the smooth operation and the business continuity without the slightest interruption of its operation. 8. Upgrade of Fire Fighting System & replacement of the pressure relief valves at BMS Sidirokastro Project Summary Type of project New Project Type of investment Equipment for NNGTS Current Budget 0,8 million € Expected benefit Improvements to the efficiency and effectiveness of the NNGS Start date October 2021 Final Investment Decision July 2022 Operation Date November 2022 Entry into the system December 2022 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of 0% NNGS Inclusion in the 3 years Development Period Yes The project consists of the following: 1. Upgrade of the Fire Fighting system so as to operate remotely and to support the unmanned operation of the station (BMS Sidirokastro operates remotely since September 2019). It consists of the Upgrade of the Fire Fighting system (Fire Detection System, CO2 system, etc.) of the Diesel Tank room, the EDG room, the Fuel Gas room, 26 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 the Gas Analyzer room, the Administration room and the Control room of BMS Sidirokastro (0,55 million €). 2. The replacement of eight Pressure Relief Valves of the Filters, of the condensate vessel, of the Gas Heaters and of the Fuel Gas skids, including piping and new Vent lines, so as to be in compliance with relative legislation (0,25 million €). The project aims to improve the safety, security of gas supply at entry point Sidirokastro and the smooth operation of the NNGTS. 9. Nitrogen Injection System Project Summary Type of project New Project Type of investment Equipment for the NGTS Current Budget 2,53 million € Expected benefit Effective operation Start date October 2021 Final Investment Decision July 2022 Operation Date June 2024 Entry in the system June 2024 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of 0,04% NNGS Inclusion in the 3 years Development Period Yes The Nitrogen Injection System is required in order to support the Booster Compression Station in Nea Messimvria. Due to the difference between the upper limit of the Wobbe Index between the gas transmitted in NNGTS and the one transmitted in the TAP pipeline, a Nitrogen Injection System shall be installed so as to treat the gas prior to its injection in the TAP pipeline. The Nitrogen injection System is composed of the following equipment: • • • • • 27 Liquid Nitrogen Storage Tanks with PBU (Three

(3)tanks with 57,3m3 capacity each) Liquid Nitrogen HP Pumps Nitrogen Ambient Air vaporizers Nitrogen Trim Heaters Nitrogen Injection Mixing Tree Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Based on the Booster Station Capacity, the maximum permissible flow N2 in the gas injected to the TAP pipeline is 4.190 kg/h. 10. Overhaul maintenance of the two

(2)BOG Compressors V-3101 A & V3101 B Project Summary Type of project New Project Type of investment Equipment for the NGTS Current Budget 0,64 million € Expected benefit Effective operation Start date May 2022 Final Investment Decision December 2022 Operation Date April 2023 Entry in the system April 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of LNG services Impact on the Average Tariff for the use of 0,01% NNGS Inclusion in the 3 years Development Period Yes LNG BOG (Boil off gas) compressor’s main role is to keep the pressure of the LNG tank within required range. Boil off gas enters into the suction line of the compressor, is compressed and sent either to a condenser for re-liquefaction, fed into a gas turbine as fuel in a power generation plant, or is directed into a pipeline for gas usage. Therefore, special considerations for its proper maintenance are required. The overhaul maintenance of the BOG compressor units aims to extend their uninterrupted operation and consequently of the LNG Terminal Station, which is crucial for satisfying DESFA’s obligations as the LNG Operator, in the most cost–effective, transparent and direct way. The overall maintenance of the two

(2)BOGs is performed every 8.000 operating hours, following the technical procedures of the manufacturer and includes: - Disassembling of crank case & cross guide, crank Shaft, connecting rods, crosshead, pistons, cylinder, valves, oil pump, water coolers and safety valves. - Visual, dimentional inspection, penetrant and magnetic tests (non-destructive testing) - Replacement of consumable spare parts (cylinder valves, rod packing, inner parts, etc) - Assembling of all parts - Commissioning 28 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 - Test run – performance test

1. Overhaul maintenance of GE 1 Unit of CHP Plant Project Summary Type of project New Project Type of investment Equipment for the NGTS Current Budget 0,5 million € Expected benefit Effective operation Start date May 2022 Final Investment Decision September 2022 Operation Date November 2022 Entry in the system November 2022 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of LNG services Impact on the Average Tariff for the use of 0,01% NNGS Inclusion in the 3 years Development Period Yes The CHP Plant provides for the electricity and thermal needs of the LNG Terminal. Following a damage and a subsequent inspection in February 2021 to one of the two CHP units, the company decided to put out of operation this machine and proceed to an overhaul maintenance as the working hours were quite close to the planned technical intervention. Having completed with the overhaul maintenance of the one generator, there is a need to conclude with the overhaul maintenance of the second (GE1) for the full functionality of the CHP Plant. The overhaul maintenance of the GE1 unit aims to extend their uninterrupted operation of the CHP Plant and consequently of the LNG Terminal Station, which is crucial for satisfying DESFA’s obligations as the LNG Operator, in the most cost–effective, transparent and direct way. Said overhaul maintenance includes the provision of the spare parts required and the supervision by 1 engineer for overhaul preventive maintenance – upgrade of the CHP Gas Engine GE1, as well as the following services: - 29 Disassembling of cylinder heads, crank case & cross guide, crank Shaft, connecting rods, crosshead, pistons, cylinder valves, oil pump, turbochargers, water coolers and safety valves. Visual, dimentional inspection, penetrant and magnetic tests (non-destructive Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 - testing) Replacement of consumable spare parts (cylinder valves – guides - seats, main bearings, connecting rod bearings, piston rings, inner parts, e.t.c) Repair or replace of connecting rods Assembling of all parts Commissioning Test run – performance test
2. LNG Upgrade Projects 2022 Project Summary Type of project New Project Type of investment Equipment for the NGTS Current Budget 0,65 million € Expected benefit Effective operation Start date May 2022 Final Investment Decision July 2022 Operation Date July 2023 Entry in the system July 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of LNG Services Impact on the Average Tariff for the use of 0,01% NNGS Inclusion in the 3 years Development Period Yes The project refers to a set of LNG Maintenance works or upgrades on the LNG Terminal of Revithoussa. In particular, the Project includes the following subprojects: i. Supply and installation of new online CL / PH analyser system in sea water chanel ORVD (€ 20.000) ii. Supply and installation of new battery of UPS chargers in tanks A/B (€110.000) iii. Recertification of inergen vessels for fire equipment units (€180.000) iv. Supply of equipment for upgrading of FMC unloading arm C (€250.000) v. Re-thermal Coating of Panels in ORVs M3101 A & B (€89.920,00) The project is important for maintaining or extending the useful life of the LNG Terminal asset and its components, which is crucial for satisfying its obligations as the LNG Operator, in the most cost–effective, transparent and direct way. 30 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
3. Transmission Upgrade Projects Project Summary Type of project New Project Type of investment Equipment for the NGTS Current Budget 0.5 million € Expected benefit Effective operation Start date May 2022 Final Investment Decision July 2022 Operation Date June 2023 Entry in the system June 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of 0,01% NNGS Inclusion in the 3 years Development Period Yes The project refers to a set of necessary upgrades of the Transmission Network System, namely: i. ii. iii. iv. Replacement of Fan Coils at 5 O&M Centers (€200.000) Replacement of Split type Air Conditioning Units in NGTS Installations (€30.000) Procurement of New Portable Air compressors (€150.000) Procurement of Pressure Relief Test Bench and accessories for Ampelia and Vistonida O&M Centers (€80.000) v. Procurement of a lift clark with a lifting capacity of 3,5 tonnes (€47.750) The project is important for maintaining or extending the useful life and integrity of the Transmission Network System assets and its components, which is crucial for satisfying its obligations as Operator, in the most cost–effective, transparent and direct way. 31 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
4. Replacement of Telecommunication and Network Equipment in NNGS Fixed Telecommunication System Project Summary Type of project New Project Type of investment Equipment for the NGTS Current Budget 0,95 million € Expected benefit Effective operation Start date May 2022 Final Investment Decision July 2022 Operation Date July 2023 Entry in the system July 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of 0,01% NNGS Inclusion in the 3 years Development Period Yes The Project aims at replacing a large part of the installed telecommunication electronic equipment due to the announced end-of-support date by manufacturer CISCO. After the expiration of the end-of-support period, the equipment will be maintainable by means of a Support Agreement Contract which ends on 31.07.
5. After this date, no new spare parts will be available for replacing failed hardware and no software will be maintainable for such equipment. The following telecommunications equipment should be installed: i. One hundred

(100)CISCO layer 3 switches ME3600X installed at almost all gas metering stations and Operation & Maintenance buildings. ii. Seventy-nine

(79)of the installed CISCO layer 3 switches ME3600X. iii. Twenty-one

(21)of the installed CISCO layer 3 switches ME3600X. iv. Three

(3)CISCO voice gateways connecting DESFA’s telephony system with the external public telephone network. v. One

(1)CISCO router installed at Kula station interfacing with Bulgartransgaz network. The configuration software of the existing installed equipment will be migrated to the new equipment respectively. 32 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031

1. Nea Messimvria M/R Station modifications for Reverse Flow Operation Project Summary Type of project New Project Type of investment Equipment for the NNGTS Current Budget 2 million € Expected benefit Effective operation Start date July 2022 Final Investment Decision October 2022 Operation Date March 2024 Entry in the system June 2024 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of 0,03% NNGS Inclusion in the 3 years Development Period Yes The project concerns the modifications of Nea Messimvria M/R station in order to supply the compressed natural gas quantities from National Natural Gas System to Trans Adriatic Pipeline system, with delivery pressure significantly higher than the NNGS operating pressure. This investment enables the full bi-directional flow in the interconnection point with the implementation of new pipework connections and equipment changes at the existing area of Nea Messimvria M/R station. The changes will accommodate the transportation of compressed Natural Gas quantities from the new Booster compressor station to the TAP pipeline.
2. Relocation of Ampelia – Karditsa – Trikala Pipeline Project Summary Type of project New Project Type of investment Equipment for the NNGTS Current Budget 4,95 million € Expected benefit Effective operation Start date July 2022 33 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Final Investment Decision July 2022 Operation Date January 2023 Entry in the system March 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Impact on the Average Tariff for the use of 0,07% NNGS Inclusion in the 3 years Development Period Yes The need of relocation for a section of the Ampelia-Karditsa-Trikala Pipeline occurs due to the final location of the new project of Ampelia Compressor Station. A number of installations have to be based on the land that HPPL passes through. The Ampelia-Karditsa-Trikala Pipeline will be relocated for a length of about 300 meters using the Line Stop Hot-Tapping method, and the construction of a new bypass in order to provide continuous operation of the Pipeline without any interruption during the relocation period.
3. Anti-Flood works and Damage Restoration in the Ampelia Station Project Summary Type of project New Project Type of investment Equipment for the NGTS Current Budget 2,5 million € Expected benefit Effective operation Start date July 2022 Final Investment Decision September 2022 Operation Date September 2023 Entry in the system December 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services 34 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Impact on the Average Tariff for the use of 0,04% NNGS Inclusion in the 3 years Development Period Yes The proposed project concerns the restoration of damages caused in the area of Ampelia before the construction of the planned Compressor Station, due to extensive floods that occurred last year and the installation of an anti-flood network that will mitigate any future flood damages. Thus, with the present project, flood works of existing structures that have been affected by the occurrence of severe weather phenomena will be executed, with indicative but not restrictive works such as topographic survey, hydraulic study, restoration or maintenance of existing flood defenses and the design of new slopes and water channels which will protect the area from future damages. The works will result in a uniform slope and uniform flow, in order to avoid as much as possible, the stagnant waters and the local deposition of sediments. Α
4. Incremental Capacity Projects according to CAM NC Following the launch of the Incremental Capacity Process on July 2021, DESFA received nonbinding demand indications for Nea Messimvria Interconnection Point (IP) and Komotni (IP). Ιn October 2021 DESFA published the respective Demand Assessment Reports (DARs), with the conclusion that there was sufficient indicative demand to initiate an Incremental Capacity Project. DESFA did not receive any demand indications for other IPs so a zero demand DAR was also published jointly with Bulgartansgaz. In January 2022, DESFA, TAP and SRG in accordance with the provisions set out in article 27

(3)of CAM NC, jointly launched a public consultation on a draft Project Proposal for incremental capacity. The comments received during the public consultation are considered to the extent possible in the final Project Proposal that will be submitted for approval to the Greek, Italian and Albanian NRAs in July

1. The Binding Phase will be launched in September 2022 after the approval of the Project Proposal by the NRA's. In parallel, in January 2022 DESFA also launched a public consultation on a draft Project Proposal for incremental capacity for Komotini IP. The respective final Project Proposal will be sent to the competent Regulatory Authorities for Energy by the end of October 2022, while the launch of the Binding Phase is expected in May
2. Α
3. Impact of the Development projects in the Average Tariff for the Use of the system of NNGS It is estimated that the inclusion in the RAB of the above new projects increases the Average Tariff for the usage of NNGS by 3,97% considering no grants and according to DESFA’s latest demand forecast study. Nevertheless, the benefits achieved from the above-mentioned projects would be important and decisive for the economy, the environment and the quality of life for the new regions concerned. 35 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 For information and transparency purposes the total capex of the present TYDP 2022 -2031 (new and planned projects already approved in previous TYDPs), excluding the projects that have no effect in the tariff, increases the Average Tariff for the usage of NNGS by 11% taking into consideration potential increased gas volumes for exports. Β. Planned Projects Β
4. Projects for the interconnection of NNGS with other interconnected systems (connection/development projects)
5. Pipeline Nea Messimvria – Evzoni/ Gevgelija and Metering Station Project Summary Type of project Planned Project Type of investment Pipeline & M Station Current Budget 67 million € Expected benefit Development SEE market, increase of usage of NNGS Start date June 2017 Final Investment Decision November 2022 Operation Date June 2025 Entry in the system July 2025 Current Status of Project Under maturity Financing plan Recovery method EIB loan4, DESFA’s own equity or other loan Inclusion in RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 236/2019 (TYDP 2017-2026) The project aims at the interconnection of natural gas transmission systems of Greece and North Macedonia which will enhance the diversification of supply sources for North Macedonia. The latter one is currently solely dependent on the supply of gas from its congested interconnection with Bulgaria. 4 Application submitted for up to a maximum of 25 million €. 36 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 DESFA and NER have signed a Memorandum of Understanding for the project in October 2016 but also have concluded, on 10 September 2021, a Cooperation Agreement for the construction of the pipeline on both parts of the border. Access to NNGS, and especially to the LNG terminal of Revithoussa and to natural gas through TAP pipeline, can benefit market competition thus leading to lower prices for the supply of natural gas in the neighboring country. Meanwhile the project enhances the regional development of natural gas market and the involvement of more market players thus enhancing the role of Greece as a hub. Furthermore, it will lead to the increased usage of the NGTS and will thus lead to a reduction of the tariffs for the usage of the transmission system in the long term. The Greek Part of the project comprises of: Approx. 55 km pipeline of 30’’ in with 80 barg design pressure and 66.4 barg maximum operating pressure starting from Nea Messimvria (downstream of the current compressor station) an ending to the Border Station U-7550 which belongs to the administrative limits of the Community of Evzoni, eastern of river Axios. A Border Metering Station (BMS) in the interconnection area (estimated capacity 430.000 Nm3/h), with a central bypass arrangement of the station at 50% of the final capacity. The new Border Metering Station design philosophy is a configuration of separate section, as follows: a. filtering section (1+1), one filtering stream in operation and one stand-by - each stream’s capacity of 430.000 Nm3/h, b. metering section (2+1), two metering streams in operation and one stand-by each stream’s capacity of 215.000 Nm3/h, c. flow control section (2+1), two flow control streams in operation and one standby - each stream’s capacity of 215.000 Nm3/h, A Scraper Station (Launcher) installed in the connection with NNGTS in Nea Messimvria - A Launcher and a Receiver Scraper Station installed in the Border Station area The basic design of the project has been completed and the environmental terms have been approved since February
6. Currently, the basic design is under update to incorporate requirements for H2 compatibility. The project will be implemented after the completion of the market test, which is expected to be launched within July
7. 37 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Figure 3: Routing of the pipeline from Nea Messimvria to the border with North Macedonia
8. Connection with the FSRU of Alexandroupolis Project Summary 5 Type of project Planned Project Type of investment Metering & Regulating station Current Budget 26 million € Expected benefit Enabling access to new Users Start date June 20185 Final Investment Decision Taken Operation Date October 2023 Entry in the system October 2023 Current Status of Project Under Construction Financing plan DESFA’s own equity Recovery method Connection Fee Connection Fee Connection Agreement with User Not yet Inclusion in the 3 years Development Period Yes First approval from RAE Decision 755/2020 (TYDP 2020-2029) / Additional The Start date refers to the day of the Advanced Reservation of Capacity Application. 38 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 The Connection Project concerns the construction of a Border Metering / Regulating Station for the receipt, control of the flow and the invoicing of the transferred quantities of natural gas from the point of entry, downstream of the scraper station of the Connected System. The new Border M/R Amphitrite Station will have a total capacity of 865.000 Nm3 /h, design pressure 110 barg, with arrangements of valves station of inlet and outlet E.S.D. (with bypass arrangement) and central bypass arrangement of the M / R station at 50% of the final capacity. The new M/R Amphitrite Station design philosophy is a configuration of separate section, as follows:
9. filtering section (1+1), one filtering stream in operation and one stand-by - each stream’s capacity of 865.000 Nm3/h,
10. metering section (2+1), two metering streams in operation and one stand-by - each stream’s capacity of 432.500 Nm3/h,
11. gas heating section (1+1), one gas heating stream in operation and one stand-by each stream’s capacity of 865.000 Nm3/h,
12. regulating section (2+1), two regulating streams in operation and one stand-by - each stream’s capacity of 432.500 Nm3/h,
13. flow control section (2+1), two flow control streams in operation and one stand-by each stream’s capacity of 432.500 Nm3/h, The connection with the NNGS will be made downstream of the Amphitrite M / R station by the HOT TAPPING method. The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures.
14. Metering and Regulating Station for connecting with Dioryga Gas FSRU Project Summary Type of project Planned Project Type of investment Metering & Regulating Station Current Budget 15 million € Expected benefit Enabling access to new Users Start date March 2021 Final Investment Decision October 2022 Operation Date December 2024 Entry in the system March 2025 Current Status of Project Under maturity Financing plan DESFA’s own equity Recovery method Connection Fee/Additional Connection Fee 39 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Connection Agreement with User Not yet Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) The Connection Project includes a new Metering/Regulating (M/R) Station where the natural gas pipeline that Dioryga Gas plans to construct, will end up. This new M/R Station will be located near the existing M/R Stations for the supply of MOTOR OIL HELLAS (MOH) refinery and the Korinthos Power S.A. Power Plant, in the area of Agioi Theodoroi in Corinthia. This new M/R station will have a capacity of 490.000 Nm3/h and a central bypass arrangement of the M / R station at 50% of the final capacity. Upon the completion of the project, a new Entry Point "DIORYGA GAS" will be created, which will satisfy Dioryga Gas' request for a total natural gas delivery of 11,76 million Nm3/d. The M/R station’s maximum output pressure will be equal to 66,4 barg. The new M/R Dioryga Gas Station design philosophy is a configuration of separate section, as follows:
15. filtering section (1+1), one filtering stream in operation and one stand-by - each stream’s capacity of 490.000 Nm3/h,
16. metering section (2+1), two metering streams in operation and one stand-by - each stream’s capacity of 245.000 Nm3/h,
17. gas heating section (1+1), one gas heating stream in operation and one stand-by each stream’s capacity of 490.000 Nm3/h,
18. regulating section (2+1), two regulating streams in operation and one stand-by - each stream’s capacity of 245.000 Nm3/h,
19. flow control section (2+1), two flow control streams in operation and one stand-by each stream’s capacity of 245.000 Nm3/h, The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures. Β
20. Projects for the connection of Users
21. M station at SALFA A. Liossia Project Summary Type of project Planned Project Type of investment Metering station Current Budget 0,72 million € Expected benefit Enabling access to new Users Start date June 2017 Final Investment Decision Taken 40 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Operation Date January 2023 Entry in the system February 2023 Current Status of Project Under construction Financing plan DESFA’s own equity Recovery method Connection Fee Connection Agreement with User Yes Inclusion in the 3 years Development Period Yes First approval from RAE Decision 236/2019 (TYDP 2017-2026) The project is developed according to the provisions of the Tariff Regulation as well as the relevant request and agreement with the “DEPA Commercial SA. The new Metering Station will be designed with a total capacity of 5.000Nm3/h in a configuration of (1+1) – one metering stream in operation and one stand-by.
22. M/R station AdG III Project Summary 6 Type of project Planned Project Type of investment Metering & Regulating station Current Budget 2 million € Expected benefit Enabling access to new Users Start date April 20116 Final Investment Decision Taken Operation Date March 2023 Entry in the system April 2023 Current Status of Project Under construction Financing plan DESFA’s own equity Recovery method Connection Fee Connection Agreement with User Yes Inclusion in the 3 years Development Period Yes First approval from RAE Decision 755/2020 (TYDP 2020-2029) The Start date refers to the day of the signing of the Connection Agreement. 41 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 The construction of the new ADG III (U-2840) Measuring / Regulating Station (U-2840) in the area of Distomo Viotia includes the dismantling of the existing ADG III station (TM1 / TM5), the installation of the building infrastructure (RCC and Station Building), the construction of the M/R Station with a capacity of 23.500 Nm3/h in a configuration of (1+1) – one metering/regulating stream in operation and one stand-by, with auxiliary installations (gas actuation systems) metal housing for the protection of the Metering skids (Skid Shelter) and connections to the existing ESD L/V (Emergency Shut Down) to supply the industry.
23. Connection of Energean Oil & Gas S.A. plant with NNGTS Project Summary Type of project Planned Project Type of investment Pipeline/Metering station Current Budget 3,9 million € Expected benefit Enabling access to new Users Start date November 20187 Final Investment Decision May 2023 Operation Date February 2025 Entry in the system May 2025 Current Status of Project Under maturity Financing plan DESFA’s own equity Recovery method Connection Fee Connection Agreement with User Not yet Inclusion in the 3 years Development Period Yes First approval from RAE Decision 755/2020 (TYDP 2020-2029) The project will be implemented for natural gas supply of the Energean Oil & Gas S.A. plant. For this project a high pressure 6” pipeline, 3 km length approximately, including needed facilities (valve station, scraper station, hot tapping) and a Metering Station for the connection of Energean Oil & Gas S.A. plant with NNGTS will be constructed. The project also includes land purchase for the valve station and scraper station. Construction of the project will be awarded after the signing of Connection Agreement with the applicant User. 7 The Start date refers to the day of submission of the application for Advanced Reservation of Capacity. 42 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
24. Metering station at Agios Nikolaos Viotia (AdG IV) Project Summary Type of project Planned Project Type of investment Metering station Current Budget 1,87 million € Expected benefit Enabling access to new Users Start date April 20188 Final Investment Decision Taken Operation Date March 2023 Entry in the system April 2023 Current Status of Project Under construction Financing plan DESFA’s own equity Recovery method Connection Fee Connection Agreement with User Yes Inclusion in the 3 years Development Period Yes First approval from RAE Decision 755/2020 (TYDP 2020-2029) The aim of this project is to install Metering Station in the greater area “Aluminium of GreeceADG” industry, in order to supply with natural gas, the new installations of “New C.C.G.T. Agios Nikolaos II”. Project includes construction of Metering skids, construction of auxiliary installations (gas actuation systems), construction of steel shelter for the protection of Metering skids (Skid Shelter), extension of the existing communication building (R.C.C.), as well as construction of new inlet and outlet Emergency Shut Down valve stations. The new Metering Station will be designed with a total capacity of 142.500Nm3/h in a configuration of (1+1) – one metering stream in operation and one stand-by.
25. Connection of ELVAL plant to the NNGTS in Inofyta Project Summary 8 Type of project Planned Project Type of investment Pipeline/Metering station Current Budget 4,95 million € The Start date refers to the day of submission of the application for Advanced Reservation of Capacity. 43 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Expected benefit Enabling access to new Users Start date December 20159 Final Investment Decision Taken Operation Date December 2023 Entry in the system March 2024 Current Status of Project Under construction Financing plan DESFA’s own equity Recovery method Connection Fee Connection Agreement with User Yes Inclusion in the 3 years Development Period Yes First approval from RAE Decision 755/2020 (TYDP 2020-2029) The project will be implemented for natural gas supply of the ELVAL SA plant in Inofyta, Viotia, for various thermal uses. Α new pipeline (extending the NNGTS), two scraper stations (launcher/ receiver) and a M / R station will be constructed for the supply of ELVAL plant. The new M/R Station is designed with an initial capacity of 11.500Nm3/h and outlet pressure of 16,7 barg, in a configuration of (1+1) – one metering/regulating stream in operation and one stand-by), with future provision for expansion to max capacity of 23.000 Nm3/h, when this will be justified by demand-wise by the downstream connected system.
26. Connection with TERNA Power Plant to the NNGTS Project Summary 9 Type of project Planned project10 Type of investment Pipeline / Metering station Current Budget 6,26 million € Expected benefit Enabling access to new Users Start date June 2020 Final Investment Decision Taken Operation Date December 2023 Entry in the system March 2024 The Start date refers to the day of submission of the application for Advanced Reservation of Capacity. 10 Transferred from the Small Projects’ List. 44 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Current Status of Project Under construction Financing plan DESFA’s own equity Recovery method Connection Fee/ Connection Fee Connection Agreement with User Yes Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) Additional The project comprises construction of a new 1,5km pipeline that will be connected to the branch of ‘’Komotini-Alexandroupoli’’ with the method of hot-tapping and construction of one-line valve station, construction of one Metering station with two metering skid, 1 working + 1 stand by, with capacity of 142.000 Nm3/h, construction of central inlet and outlet Emergency Shut Down valve stations, and construction of one-line valve station as NNGTS exit point.
27. Connection with ELPEDISON Power Plant to the NNTGS Project Summary Type of project Planned project11 Type of investment Pipeline/ Metering station Current Budget 3,46 million € Expected benefit Enabling access to new Users Start date June 2020 Final Investment Decision Taken Operation Date September 2023 Entry in the system December 2023 Current Status of Project Under construction Financing plan DESFA’s own equity Recovery method Connection Fee Connection Agreement with User Yes Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) 11 Transferred from the Small Projects’ List. 45 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 The aim of this project is to install one Metering Station at the west area of Thessaloniki in order to supply with natural gas the new Power Plant of ELPEDISON. The project comprises construction of a new 0,3km pipeline that will be connected to the branch of ‘Pentalofos Diavata’’ with the method of hot-tapping, construction of one-line valve station, construction of one Metering station with two metering skid, 1 working + 1 stand by, with capacity of 130.000 Nm3/h and construction of central inlet and outlet Emergency Shut Down valve stations inside DESFA’s property. Β
28. Development Projects: Expansion of NNGS to new areas connected to distribution network B.3.
29. Supply of West Macedonia
30. SSLNG infrastructure to supply the regions of Poria, Aspros & Perdikas Project Summary Type of project Planned Project Type of investment SSLNG infrastructure Current Budget 11,03 million €, including leasing of semi-trailers for 15 years Expected benefit Supply of new areas Start date July 2022 Final Investment Decision November 2022 Operation Date October 2023 Entry in the system October 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in the RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 755/2020 (TYDP 2020-2029) The inclusion of the expansion of the NGTS to the regions of Western Macedonia has been approved by RAE already with their 755/2020 (TYDP 2020-2029). The initial approach was that the regions of Perdikkas and Aspros will be initially connected with TAP, while the region of Poria will be permanently connected to TAP. DESFA would enter into all necessary commercial 46 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 arrangements with TAP to implement the appropriate interface which would safeguard that the gas supply chain to the consumers of those regions connected to TAP would be equivalent to their supply through the NGTS, while the resulting cost would be incorporated into the required revenue of the NGTS and be covered by the use of the system tariffs. However, following RAE’s request, DESFA has assessed the alternative of supplying of the corresponding regions through a virtual pipeline based on a small scale LNG (SSLNG) supply chain. Based on a comparative analysis of the corresponding costs, which proves that the option for the temporary supply of Perdikkas and Aspros through SSLNG until the pipeline to West Macedonia is put in operation, and the permanent supply through SSLNG of the region of Poria is the most cost efficient one, DESFA includes in the TYDP 2022-2031 the solution of the SSLNG virtual pipeline for the supply of these areas. The project consists of the necessary ssLNG installations for the supply of the regions Poria, Aspros and Perdikas in West Macedonia. It should be highlighted that the areas of Aspros and Perdikas will be supplied though the HP Pipeline in West Macedonia upon its completion, therefore the proposed ssLNG infrastructures in these areas will serve only the supply of the regions on a temporarily basis. To this end, the most efficient solution is to proceed with modular small size tanks and gasifiers, which are easy to be relocated, thus maximizing possible synergies and minimizing relevant cost. Those installations will then be relocated to Poria and other possible regions, following the commercial operation of the high-pressure pipeline. The supply chain till the area of West Macedonia, refers to the loading of LNG in semi-trailers from the truck loading station in Revithousa and its transportation and unloading in tanks in the aforementioned regions. As per the preliminary design the necessary equipment consists of: Table 1- Necessary Installations for the supply of the regions Aspros, Perdikas & Poria with natural gas Aspros Perdikas Poria Trailers 43-48 m3 net LNG capacity12 3 2 2 Storage Tanks of 108 m3 net LNG capacity 4 2 2 2.200 -2.400 Nm3/h 1.100 -1.200 Nm3/h 1.100 -1.200 Nm3/h Vaporization rate For Aspros and Perdikas the aforementioned infrastructure are considered sufficient to cover the emerging demand for the first year of the introduction of natural gas in the area, since, after that, both regions will be supplied through the HP Pipeline to West Macedonia. From that point onwards the ssLNG equipment could be relocated either to Poria or other cities depending on the evolution of the market. Finally, regarding the semi-trailers, the proposed solution includes the option for leasing them for 15 years, depending on the case, however relevant optimization will take place upon basic design of the project. 12 Including 2 extra semi-trailers for contingency purposes 47 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
31. High Pressure pipeline to West Macedonia Project Summary Type of project Planned Project Type of investment Pipeline & M station Current Budget 167 million € Expected benefit the supply of new areas with natural gas ensuring new Users’ potential access/ decarbonization of Greek System Start date July 2020 Final Investment Decision Taken Operation Date June 2024 Entry into the system September 2024 Current Status of Project Under construction Financing plan Recovery method DESFA’s own equity or loan, possible NSRF 2021-2027 grant13 Inclusion in the RAB of Transmission System (w/o possible grants) Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) The project is included to support the decarbonization policy introduced by the Hellenic Republic and it concerns the extension of the existing NGTS via a new pipeline branch up to the region of West Macedonia. According to the basic design study the Project consists of 157 km Natural Gas High Pressure pipeline, out of which: • 93,4 Km/30” HPP starting from the existing LVS at Trikala Imathias and ending north of Ptolemaida (Komnina new LVS) • 29,8 Km/ 14” HPP branch for connection to Kardia M Station • 3,4 Km/10’’ HPP branch for connection to Aspros M/R station • 9,1 Km/10’’ HPP branch for connection to Perdikkas M/R station • 21,3Km/ 10” HPP branch for the supply of Veria/Naoussa district and including all the necessary auxiliary facilities and line valve stations for the operation of the project as well as provisions for future extensions. The project also includes Kardia Metering Station to supply the district heating installations for the cities of Kozani, Ptolemaida and Amyntaio, as well as line valves to supply other consumption in the region. The Metering Station is designed with a total capacity of 50.000Nm 3/h, 13 DESFA has applied for inclusion in the NSRF 2021-2027 for apprx. 30% of the capex. 48 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 in a configuration of (1+1) – one metering stream in operation and one stand-by. The timeline of the project is aligned with the teleheating installations project time schedule. The project’s design has been aligned with the company’s strategy for energy transition and more specifically it will be constructed to be compatible for H2 transportation up to 100%. Therefore, and in combination with the White Dragon project for hydrogen production in the area, it will initiate actions for hydrogen adaptation in the market.
32. M/R Station in the region of Aspros Project Summary Type of project Planned Project Type of investment Metering & Regulating Station Current Budget 3,5 million € Expected benefit Supply of new areas Start date December 2019 Final Investment Decision Taken Operation Date June 2024 Entry in the system September 2024 Current Status of Project Under construction Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 755/2020 (TYDP 2020-2029) Aspros M/R Station will be fed with natural gas from West Macedonia Pipeline, and it will supply the cities of Edessa, Skidra and Gianitsa. The new M/R Station is designed with an initial capacity of 15.000Nm3/h and outlet pressure of 16,7 barg, (in a configuration of (1+1) – one metering/regulating stream in operation and one stand-by), with future provision for expansion to max capacity of 30.000 Nm 3/h, when this will be justified by demand-wise by the downstream connected system. The project is designed to be 100% H2 ready. The M/R Station of Perdikas Eordeas will be fed with natural gas from West Macedonia Pipeline, and it will supply local cities gas distribution network. 49 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
33. M/R Station in the region of Perdikas Eordeas Project Summary Type of project Planned Project Type of investment Metering & Regulating Station Current Budget 4,2 million € Expected benefit Supply of new areas Start date December 2019 Final Investment Decision Taken Operation Date June 2024 Entry in the system September 2024 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 755/2020 (TYDP 2020-2029) The new M/R Station is designed with an initial capacity of 5.000Nm3/h and outlet pressure of 16,7 barg, (in a configuration of (1+1) – one metering/regulating stream in operation and one stand-by), with future provision for expansion to max capacity of 10.000 Nm3/h, when this will be justified by demand-wise by the downstream connected system. The project is designed to be 100% H2 ready. B.3.
34. Supply of Western Greece & Peloponnese
35. High Pressure Pipeline to Patras Project Summary Type of project Planned Project Type of investment Pipeline & M/R Station Current Budget 98 million € Expected benefit the supply of new areas with natural gas and the ensuring of new Users’ potential access 50 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Start date July 2020 Final Investment Decision May 2023 Operation Date June 2025 Entry in the system September 2025 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) In line with relative request of the Western Greece Region, the project concerns the connection of the city of Patra and the Industrial Area (VIPE) of Patras with the NNGS, with provision for future extensions to other cities of the Western Greece Region. According to the preliminary routing, the project consists of a high-pressure pipeline, of approximately 130 km and 20” diameter, starting from a suitable point on the HPP branch of Megalopolis. The project also includes all necessary infrastructure and a Metering/ Regulating station. The M/R Station will be designed with an initial capacity of 27.500Nm3/h with configuration of (1+1) – one metering/regulating stream in operation and one stand-by, with future provision for expansion to max capacity of 55.000 Nm3/h, when this will be justified demand-wise by the downstream connected system. DESFA will coordinate with the Distribution System Operator who will undertake the development of the distribution network in the region. The project is designed to be 100% H2 ready. Figure 4: Pipeline Routing 51 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031
36. Korinthos M/R city gate station Project Summary Type of project Planned Project Type of investment M/R Station Current Budget 2,7 million € Expected benefit Enabling access to new Users Start date July 2020 Final Investment Decision Taken Operation Date September 2023 Entry in the system December 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) The investment consists of one Metering Regulating city gate station at the area of Korinthos including construction of Metering and Regulating skid, construction of auxiliary installations, construction of steel shelter for the protection of M/R skid (Skid Shelter), as well as connection with the existing NNGTS pipeline. The capacity of the of the station has been estimated at 20.000 Nm3/h with a (1+1) configuration. Construction of the project will be awarded following coordination with the Distribution System Operator who will undertake the development of the distribution network in the city of Korinthos. The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures.
37. Argos/Nafplio M/R city gate station Project Summary Type of project Planned Project Type of investment M/R Station Current Budget 2,9 million € Expected benefit Enabling access to new Users 52 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Start date July 2020 Final Investment Decision Taken Operation Date September 2023 Entry in the system December 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) The investment consists of one Metering Regulating city gate station including construction of Metering and Regulating skid, construction of auxiliary installations, construction of steel shelter for the protection of M/R skid (Skid Shelter), as well as connection with the existing NNGTS pipeline. The new M/R Station is designed with an initial capacity of 10.000Nm3/h and outlet pressure of 16,7 barg, in a configuration of (1+1) – one metering/regulating stream in operation and one stand-by, with future provision for expansion to max capacity of 20.000 Nm3/h, when this will be justified demand-wise by the downstream connected system. Construction of the project will be awarded following coordination with the Distribution System Operator who will undertake the development of the distribution network in the cities of Argos and Nafplio. The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures.
38. Tripoli M/R city gate station Project Summary Type of project Planned Project Type of investment M/R Station Current Budget 2,3 million € Expected benefit Enabling access to new Users Start date July 2020 Final Investment Decision Taken Operation Date October 2022 53 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Entry in the system October 2022 Current Status of Project Under construction Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) The investment consists of one Metering Regulating city gate station at the area of Tripolis. The capacity of the station is estimated 20.000 Nm3/h, in a configuration of (1+1) one metering/regulating stream in operation and one stand-by. Construction of the project will be awarded following coordination with the Distribution System Operator who will undertake the development of the distribution network in the city of Tripolis. The project includes construction of Metering and Regulating skid, construction of Emergency Shut Down inlet and outlet valves stations both with 4’’ by-pass arrangement, construction of steel shelter for the protection of M/R skid (Skid Shelter), M/R Control system as well as connection with the existing NNGTS pipeline. The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures. B.3.
39. Supply of Central Macedonia
40. Drymos/Liti M/R city gate station Project Summary Type of project Planned Project Type of investment Metering & Regulating station Current Budget 3,8 million € Expected benefit Enabling access to new Users Start date July 2020 Final Investment Decision Taken Operation Date August 2023 Entry in the system September 2023 Current Status of Project Under maturity Financing plan DESFA’s own equity or loan 54 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 Recovery method Inclusion in the RAB of Transmission Services Inclusion in the 3 years Development Period Yes First approval from RAE Decision 116/2021 (TYDP 2021-2030) Drymos Metering / Regulating Station will be fed from the National Natural Gas Transmission System (NNGTS) through the existing main pipeline with Hot-Tapping Method. New M/R station’s maximum capacity will be 18.000Nm 3/h and it will be constructed in two phases: Phase 1: 9.000 Nm 3/h, Phase 2: 18.000 Nm 3/h. In the first phase, two

(2)gas metering and regulating streams shall be installed in a (1+1) configuration – one in operation and one stand-by – with each stream’s capacity of 9.000 Nm3/h, an interconnecting pipeline of 100m estimated length, Hot-Tapping configuration with all relevant equipment and installations, as well as Control Room’s and RCC’s equipment that will be installed at M/R station’s Cabinet. The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures. B.3.

1. Supply of other areas
2. Metering / Regulating Station Livadia U-2710 Project Summary Type of project Planned Project Type of investment M/R Station Current Budget 2,3 million € Expected benefit Enabling access to new Users Start date July 2018 Final Investment Decision Taken Operation Date July 2022 Entry in the system September 2022 Current Status of Project Under construction Financing plan DESFA’s own equity or loan Recovery method Inclusion in RAB of Transmission Services Inclusion in the 3 years Development Period Yes 55 Draft NATIONAL NATURAL GAS SYSTEM’s DEVELOPMENT PLAN 2022-2031 First approval from RAE Decision 755/2020 (TYDP 2020-2029) The aim of this project is to install one M/R City Gate Station in the greater area of Livadia, in order to supply the distribution networks (19 barg MP) of Livadia city with natural gas. The project includes the construction and installation of a Metering and Regulating skid with capacity of 11.500 Nm3/h and outlet pressure of 16,7 barg, (5.750 Nm3/h with 1 working + 1 stand by , with future provision for expansion to 2 working + 1 stand by, adding 5.750 Nm 3/h capacity), when justified by demand, the construction of Emergency Shut Down inlet and outlet valves stations both with 4’’ by pass arrangement, construction of steel shelter for the protection of M/R skid (Skid Shelter), M/R Control system as well as connection with the NNGTS pipeline, for gas supply of final consumers. The project is designed to allow for a specific percentage of blends; the allowable blend of H2 and natural gas is under evaluation, according to the specifications of the existing infrastructures. Β
3. Development Projects: Expansion of NNGS to new markets
4. Truck Loading Pilot (first) Station Project Summary Type of project Planned Project Type of investment Small scale LNG facility Current Budget 7,5 million € Expected benefit Supply of new areas/markets/ decarbonization of the Greek energy system Start date April 2016 Final Investment Decision Taken Operation Date June 2022 Entry in the system July 2022 Current Status of Project Under construction Financing plan Recovery method 14 Approved with 57,42% of eligible budget. 56 Poseidon Med II Grants (fo