Cyprus cable awaits Greece’s October notice

Somewhere between Crete and Cyprus, a survey vessel is waiting for permission to move. The navigational notice that would clear its path has not been issued. Until it is, Europe's most ambitious undersea electricity project stays where it has been for two years: a plan stopped at the water's edge by a sovereignty dispute no one has resolved.

The cable, the gap, the blocked ship

The Great Sea Interconnector (GSI) is meant to end Cyprus's isolation as the only EU member state with no electricity link to the European grid. The cable would run 1,208 km from Crete to Cyprus at depths approaching 3,000 metres, at an estimated cost of EUR 1.9 billion (Enerdata). The European Commission designated it a Project of Common Interest and committed nearly EUR 658 million through the Connecting Europe Facility, its infrastructure funding programme (Euronews, Cyprus Mail).

About 60% of the seabed mapping is done. The remaining 40% lies in waters both Greece and Turkey claim (Greek News Agenda). That gap is the story. In July 2024, when an Italian-flagged survey vessel entered the corridor south of Kasos and Karpathos, Turkey deployed warships and the vessel stopped. No survey progress followed (DW).

France bought a stake, not a guarantee

On 5 August, French infrastructure investor Meridiam bought majority control of the project company. IPTO, the Greek grid operator, keeps technical charge of the engineering (Prime Minister of Greece). A separate deal between IPTO and French cable manufacturer Nexans, which already holds a cable contract worth roughly EUR 1.43 billion, covers the seabed surveys that must happen before any cable goes down (Energynews.pro, Powergame).

Paris now has capital, industrial contracts and diplomatic exposure tied to the cable. Reports say Greek Prime Minister Mitsotakis, Cypriot President Christodoulides and French President Macron discussed accelerating the navigational notice once operational decisions are ready (Cyprus Mail). Speculation about a French naval escort circulated in Greek media, but no official confirmation came from Paris, Athens or Nicosia (RUA). French money raises the political cost of obstruction. It does not make Greece free to send the ship (Kathimerini).

Ankara has not moved. Turkish officials say seabed work in waters Turkey claims requires Turkish permission (Hürriyet). The legal dispute is genuinely contested. Greece and Cyprus, citing the UN Convention on the Law of the Sea (UNCLOS, the treaty governing maritime jurisdiction), argue that islands generate exclusive economic zones. Turkey, which has not signed UNCLOS, says they do not where they overlap with a mainland continental shelf. Under Turkey's reading, the waters between Crete and Cyprus are Turkish. Under Greece's, Greek and Cypriot zones meet. A seabed survey is not neutral here: it helps determine a cable route that one side may later treat as validation of its maritime claims. Turkey's 2024 intervention showed it treats survey permission as the operational threshold (Daily Sabah).

Cyprus pays the most, sees the least

Cyprus would carry 63% of the cable's cost, around EUR 786 million, because it is the EU's last isolated electricity market (Euronews). Of the EUR 251 million IPTO says it has already spent, Cyprus's energy regulator assessed only 32% as recoverable (ProtoThema). Opposition leader Stefanos Stefanou has asked the finance minister how Meridiam's entry affects total cost, viability and consumer burden. The question is reasonable: Cypriot taxpayers and bill-payers are financing a cable whose next physical step depends on a confrontation they cannot control.

ENTSO-E, the body coordinating Europe's electricity grid operators, confirmed in April that GSI is the only recognised interconnector for Cyprus. It refused to consider any alternative routed through Turkey or northern Cyprus (ENTSO-E). The Commission calls its commitment "crystal clear." The navigational notice that would test that clarity is expected around October.

Brussels has spent nearly EUR 658 million designating, funding and planning a cable whose next step requires a survey vessel to enter waters where a non-EU state sent warships two years ago. So far, the Commission has treated GSI as an energy project. The next navigational notice will show whether it is willing to treat it as a sovereignty problem.