Priority Projects

The List of Priority Interconnection Projects was one of the main outcomes of the 3rd Three Seas Initiative Summit held in Bucharest in 2018. Back then it comprised 48 projects in energy, digital and transport infrastructure. At the time of publication of the 2024 Status Report, the total number of interconnection projects under the Three Seas Initiative has reached 143 grossing an estimated investment value of 111 billion euros. Number of priority project has almost tripled since 2018 when the first List of Priority Interconnection Projects was presented. 

Database of the Three Seas Interconnection Priority Projects can be found here.
For more information on Status Reports of the Three Seas Interconnection Priority Projects, click

By implementing these projects, the participating countries aim to answer the needs and priorities of the member states and provide a substantial contribution to the overall objective of the Three Seas Initiative. 

These projects help to stimulate economic growth, develop north-south infrastructure corridor, level regional disparities within the EU and boost cohesion and unity in Europe. 

The update of priority projects is made annually and presented during the Three Seas Summits. 

In this Status Report you can find in total 143 different projects and their progress compared to last year.

Projects by countries

Bulgaria: (4)
1.Tunnel under Petrohan Pass
2. Restoration of the design parameters of Ruse-Varna railway line
3. UGS Chiren Expansion
4. Black Sea Highway

Czechia: (2)
2. RS Brno – Přerov – Ostrava – CZ/PL border

Croatia: (32)
1. Construction of A5 Motorway
2. Regulation works on the Danube river on km 1,322 (Sotin) [completed]
3. Oil and Gas Terminal in Port of Ploče
4. Construction of the second track, renewal and modernization of the rail section Škrljevo - Rijeka – Jurdani
5. Sava IW section between Jaruge – Novi Grad
6. LNG Terminal on the Island of Krk with evacuation pipeline [completed]
7.Port of Rijeka infrastructure upgrading and development, development of multimodal platforms and interconnections – Adriatic Gate container terminal (POR2CORE-AGCT) [completed]
8. Project of Rijeka — Zagreb Deep Sea Container Terminal
9. Upgrade of the Rijeka Port infrastructure – Port Community System (POR2CORE-PCS) [completed]
10. Port of Rijeka infrastructure upgrading - General cargo terminal (POR2CORE-GCT) [completed]
11. Upgrade of the Rijeka Port infrastructure - Rijeka Basin (POR2CORE-Rijeka Basin)
12. Upgrade of the Rijeka Port infrastructure - Bakar bulk cargo terminal (POR2CORE-BCTB)
13. Ionic Adriatic Pipeline
14. NP-BBI Programme
15. Compressor station 1 at the Croatian gas transmission system [completed]
16. Zlobin-Bosiljevo Pipeline
17. Croatia – Bosnia and Herzegovina Gas Interconnection
18. Bosiljevo-Sisak-Kozarac-Slobodnica Gas Pipeline
19. Croatia – Slovenia Gas Interconnection (Lučko – Zabok – Rogatec Pipeline)
20. Regulation works on the Sava river – Section: Račinovac – Sisak
21. Construction of Channel Danube – Sava
22. Expansion of the capacity of the LNG Terminal on the island of Krk
23. Upgrade of the Rijeka Port infrastructure – construction and equipping of a grain storage facility
24. Upgrade of the Rijeka Port infrastructure – supplying container ships from the mainland
25. Upgrade of the Rijeka Port infrastructure – waste water treatment plant in Raša
26. New Zagreb Bypass
Upgrade of the A1 Motorway (Zagreb-Karlovac-Bosiljevo Section)
28. Completion of the Ionian-Adriatic Motorway (Croatian Section
29. Construction of the vertical coast in the Port of Vukovar
30. New doubletrack railway line on section Skradnik-Krasica-Tijani
31. Modernization of the M202 Zagreb GK – Rijeka Line on the Karlovac – Oštarije Section
32. Modernization of Oštarije – Knin – Split Railroad Line

Estonia: (5)
1. Commissioning of the regional LNG terminal in Paldiski, Estonia [completed]
2. Construction of the 500MW Estonian Pumped-Hydro Energy Storage
3. Integration and synchronisation of the Baltic States’ electricity system with the European networks
4. Rail Baltica
5. Via Baltica

Hungary: (15)
1. Construction of a 2nd track between Sopron and Györ, Phase 0
2. Construction of the Zalaszentiván (HU) triangle track
3. Reconstruction and capacity improvement of traction substations in Hungary
4. Upgrade the railway link between the inland Freeport of Budapest and the core network corridor.
5. Preparation of the electrification on Zalaszentiván – Nagykanizsa railway line (HU)
6. Construction of a new road bridge over the Tisza in the Záhony area
7. North-South Gas Corridor – Expansion of existing capacity between Hungary and Slovakia
8. ROHU – Second Phase
9. Launching a Hungarian-American pilot project in Hungary, studing the use of hydrogen
10. Extraction of unconventional gas
11. 500 MW CCGT Power Plant to replace the Marta Power Plant
12. Development of 130-260 MW PV solar power plant
13. Development of intelligent electricity networks
14. Development of High-Performance Computing (HPC) infrastructure, establishment and operation of HPC ecosystem in the CEE-n region
15. Adaption of GSM-R towers to 5G

Latvia: (9)
1. Rail Baltica: Construction of Salaspils Intermodal Logistics Centre within the Framework of the Construction of High-speed Rail Network
2. Development of a wind farm project
3. Integration and synchronisation of the Baltic States’ electricity system with the European networks
4. Introduction of Smart Outdoor Lighting Technologies
5. Development and Implementation of Mobility Solutions
6. Construction of the Salaspils-Baltezers as part of the Via Baltica Project
7. Construction of a coastal LNG terminal
8. Development of Cross-Border Optical Fibre Network
9. Development of cross-border network of data centres

Lithuania: (11)
1. Gas Interconnector Republic of Poland-Republic of Lithuania (GIPL) [completed]
2. Integration and synchronisation of the Baltic States’ electricity system with the European networks
3. Connection of offshore wind farm to the electricity transmission grid of Lithuania
4. Rail Baltica
5. Via Baltica
6. Purchase of the FSRU INDEPENDENCE (Klaipėda LNG terminal)
7. 5G Cross-Border Transport Corridors for Connected and Automated Mobility CAM in Baltics
8. Installation of electricity storage facilities (200 MW) [completed]
9. Development of serial production of M3 class electric buses
10. Power to Gas Pilot Project
11. The green fuel (hydrogen) production plant and public hydrogen refueling stations at Port of Klaipeda

Poland: (11)
1. Gas Interconnector Republic of Poland-Republic of Lithuania (GIPL) [Completed]
2. Via Carpatia
3. Diversification of gas supply sources and integration of gas infrastructure in the Three Seas Region with the implementation of the Baltic Pipe project and cross-border interconnections Republic of Poland-Slovak Republic and Republic of Poland-Ukraine
4. U-space, low altitude space as a new field of economy. Central European Drone Demonstrator (CEDD) [Completed]
5. Baltic – Adriatic TEN – T Core Network Corridor
6. Rail Baltica
7. “Amber” Rail Freight Corridor
8. Improving Poland-Czech Inland Waterway Connection
9. Posejdon + HyFly2
10. Improvement of railway links between main Polish cities and neighbouring countries
11. Construction of CPK railway line Warsaw – Lublin - Trawniki - Zamość - PL/UA border with its possible extension to Rava-Ruska and Lviv

Romania: (9)
2. Transportation stock exchange in the 3SI region
3. Digital Platform on monitoring hydrographic bases in the 3SI region
4. Via Carpatia
5. FAIRway Danube [Completed]
6. Rail-2-Sea
7. Interoperability solutions for a digitized and sustainable energy sector in the 3SI area in the field of energy storage
8. Development of a Cloud for Artificial Intelligence processing - AI CLOUD
9. Development of a High-Performance Computing Cloud - HPC Cloud

Slovakia: (7)
1. Eastring
2. Via Cartpatia R4 Expressway
3. InoBat
4. PWenergy Pilot Project - Geothermal Power Plant Ziar nad Hronom
5. PWenergy - Geothermal Power Plant Presov
6. GridStor - Lead-Sodium Battery
7. Fuergy – Optimization of Energy Cost of Large Industrial Units

Slovenia: (6)
1. HU-SI gas interconnector
2. Pilot Project 5G PPDR – Public Protection Disaster Relief
4. Construction of the 2nd railway track between Koper and Divača
5. Reconstruction of the Ljubljana railway junction
6.Adria Flood and Drought Risk Mitigation System

Greece: (7)
1. Upgrading of the existing and installation of signalling - ECTS and electrification - of the railway line in the section "Alexandroupoli - Pythio (border with Turkey) - Ormenio (border with Bulgaria - Svilengrad)".
2. New railway line to connect the new freight port of Kavala with the existing railway network (Section "N. Karvali - Toxotes").
3. New railway line "Thessaloniki - Amphipolis - N. Karvali" (with signaling - ETCS and electrification also on the N. Karvali - Toxotes section).
4. Upgrading the existing railway line "Thessaloniki - Premahonas (section Mouries - Premahonas)" for the installation of electrification.
5. Completion of the studies for the upgrading of the existing railway line in the section "Strimonas - Toxotes".
6. Studies for the upgrade of the existing railway line on the section "Toxotes - Alexandroupolis 2020-EL-TMC-0078-S", with a budget of 4.092.000 € including VAT.
7. Construction of the overall project for the upgrading of the existing Strymonas - Alexandroupoli line.

Ukraine: (12)
1. Development of the TEN-T North Sea - Baltic corridor with the reconstruction and construction of a 1435 mm gauge track on the territory of Ukraine
2. Development of the TEN-T Baltic Sea – Black Sea – Aegean Sea corridor with the construction of a 1435 mm gauge track on the territory of Ukraine
3. Development of a network of logistics terminals
4. Development of near-port railway infrastructure Reconstruction of Chornomorsk-port station
5. Construction of the interstate line Pivdennoukrainska NPP - Isaccea (Romania)
6. Reconstruction of the OHL 400 kV Mukachevo-Kapusany section from SS 400 kV Mukachevo to the state border in Zakarpattia region
7. Expansion of the export-import potential of Ukraine and Poland
8. Expansion of the Poland-Ukraine interconnector
9. Expanding the capacity of the Trans-Balkan Pipeline
10. Construction of the Brody - Adamova Zastava oil pipeline
11. Transportation of different types of oil through the South Druzhba pipeline
12. The Central European Hydrogen Corridor

Moldova: (13)
1. Interconnection with Ukraine - 2nd circuit of the 330 kV Overhead Power Line (OPL) "Bălţi - Dnestrovsk Hydroelectric Power Plant (HPP)"
2. Construction of a new Combined Heat & Power (CHP).
3. The construction of the plant to ensure the balancing of the system
4. Energy storage systems in 100 MW batteries
5. Capitalizing on Hydro's potential
6. Development of hydrogen infrastructure
7. Expansion and development of Giurgiulesti Port
8. The rehabilitation of the entire railway infrastructure of the Republic of Moldova to ensure the increase in capacity and the increase in the volumes of transported goods
9. Elaboration of feasibility studies regarding the development of a new railway corridor with European gauge, electrified, according to environmental requirements, to ensure UA-MD-EU interconnectivity that will ensure the increase of the resilience of rail transport systems and logistics chains.
10. The development of the electrification project of the Chisinau-Ungheni railway corridor, with subsequent interconnection of the entire railway corridor of the country for the development of a modern railway infrastructure, aligned with European requirements and the integration of railway networks with European ones
11. Development of Chisinau International Airport
12. Development of the Ungheni-Chisinau-Odesa Motorway
13.Construction of the Chisinau Intermodal Cargo Terminal.

For more information about the updating of priority projects, please contact