Why is this subsea cable project critical for Greece's energy transition?

It allows Greece to shut down inefficient, highly polluting diesel generators on the Aegean islands, significantly reducing carbon emissions and lowering electricity costs for consumers. Furthermore, it enables these islands to feed their own abundant solar and wind energy back into the national mainland grid.

How does this contract affect the global subsea cable supply chain?

With only a handful of global manufacturers capable of producing and laying high-voltage subsea cables, this €910 million deal ties up significant production capacity at Prysmian. This tightens the market further, potentially driving up costs and extending lead times for other planned offshore wind and interconnector projects globally.

Does this project have any connection to the Great Sea Interconnector linking Greece and Cyprus?

Yes, indirectly but significantly. IPTO is the promoter for both projects, and Prysmian is the cable contractor for the Crete-Cyprus link; IPTO's deepening relationship and successful execution of large-scale projects with Prysmian strengthens the technical and financial credibility of the broader Eastern Mediterranean grid integration.

Offshore Energy · June 23, 2026 (Jun 23) · 1 min read

Prysmian lands €910 million job for Greek island grid interconnections

Analysis

AI-assisted analysis · reviewed by Yuri Kan

Italian cable manufacturing giant Prysmian has clinched a major €910 million framework agreement with Greece's grid operator, IPTO, to link several Aegean islands to the mainland power grid. This massive subsea electrification project represents a critical step in Greece's strategy to phase out expensive, polluting diesel generators on its islands and integrate more offshore renewable energy. For the Eastern Mediterranean, this contract underscores the soaring demand and tight supply chain for high-voltage subsea cabling, which has direct implications for broader regional interconnectors.

Key Facts

Prysmian secured a framework contract valued at approximately €910 million with the Independent Power Transmission Operator (IPTO) of Greece.
The project focuses on the design, supply, installation, and commissioning of high-voltage alternating current (HVAC) subsea and land cable systems.
The scope of work covers the interconnection of the Dodecanese islands (including Kos, Rhodes, and Karpathos) and the Northeast Aegean islands (including Lesbos, Chios, and Samos) to the Greek mainland.
The subsea cables will be laid at depths of up to 1,200 meters, utilizing Prysmian's state-of-the-art cable-laying vessels.
The marine installation phase of the project is scheduled to be executed between 2027 and 2030, aligning with Greece's broader National Energy and Climate Plan.

Background & Context

For decades, Greece's isolated Aegean islands have relied on localized, heavy fuel oil and diesel-fired power plants to meet their electricity needs, resulting in high generation costs and significant carbon emissions. IPTO has been executing a multi-phase, multi-billion-euro master plan to connect these islands to the mainland grid, thereby improving energy security and lowering consumer tariffs. This initiative aligns with the European Union's decarbonization targets and efforts to modernize Mediterranean energy infrastructure through subsea transmission corridors.

Market Impact

This contract solidifies Prysmian's dominance in the subsea cable market, but also highlights the extreme capacity constraints within the global cable manufacturing sector. By locking in €910 million in capacity, IPTO secures vital supply chain priority, while other regional projects may face longer lead times and higher costs due to limited manufacturing slots. Strategically, the project will allow Greece to displace expensive fossil-fuel generation on the islands and unlock local wind and solar potential, transforming the Aegean from an energy sink into a green power exporter.

What to Watch

Moving forward, the industry will watch for the finalization of individual work orders under this framework agreement and the commencement of detailed marine surveys. The manufacturing of the specialized HVAC cables is expected to begin in the coming years, with offshore laying operations targeted to start around 2027. Stakeholders will also monitor how this project impacts IPTO's capital expenditure allocation for other international interconnection initiatives.

Why This Matters for Cyprus

This development is highly relevant to Cyprus as IPTO is also the project promoter for the Great Sea Interconnector (GSI), which aims to link the grids of Greece, Cyprus, and Israel. Prysmian is already the contracted cable supplier for the Crete-Cyprus segment of the GSI. IPTO's successful partnership and resource allocation with Prysmian on this €910 million Aegean project could influence the timeline, engineering synergy, and supply chain prioritization for the Cyprus-Greece interconnection.

Frequently Asked Questions

Why is this subsea cable project critical for Greece's energy transition?: It allows Greece to shut down inefficient, highly polluting diesel generators on the Aegean islands, significantly reducing carbon emissions and lowering electricity costs for consumers. Furthermore, it enables these islands to feed their own abundant solar and wind energy back into the national mainland grid.
How does this contract affect the global subsea cable supply chain?: With only a handful of global manufacturers capable of producing and laying high-voltage subsea cables, this €910 million deal ties up significant production capacity at Prysmian. This tightens the market further, potentially driving up costs and extending lead times for other planned offshore wind and interconnector projects globally.
Does this project have any connection to the Great Sea Interconnector linking Greece and Cyprus?: Yes, indirectly but significantly. IPTO is the promoter for both projects, and Prysmian is the cable contractor for the Crete-Cyprus link; IPTO's deepening relationship and successful execution of large-scale projects with Prysmian strengthens the technical and financial credibility of the broader Eastern Mediterranean grid integration.

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