Nexans has signed a subcontract with Hellenic Cables, which is working in consortium with Asso.subsea, to deliver a 420 km mass-impregnated (MI) 110 kV cable system for the Corinth-Kos interconnection in Greece. The cable manufacturer announced the agreement in Paris on 6 November 2026.
The 1 GW, 320 kV high-voltage direct current (HVDC) link will connect the Dodecanese islands more closely to the Greek mainland. Nexans said the project would support a more resilient and integrated electricity system and contribute to Greece’s long-term energy transition.
A 1,260 km subsea link to the Dodecanese
The Corinth-Kos interconnection was awarded to Hellenic Cables by the Independent Power Transmission Operator (IPTO). The project comprises approximately 1,260 km of subsea cable and 30 km of land cable.
Nexans described the development as one of the most ambitious power transmission projects in the Mediterranean region.
Nexans’ role in the Corinth-Kos interconnection
Nexans’ scope covers the 110 kV cable system. The company described it as a critical component of the HVDC link that enables the safe and reliable operation of the interconnection.
According to the company, project-related activities on its MI cable production lines have been initiated, along with a seabed survey. Nexans expects the work to use these production lines from the end of 2026, throughout 2027 and up to mid-2028.
Manufacturing workload through to mid-2028
Pascal Radue, executive vice-president of PWR-Transmission at Nexans, linked the contract to wider demand for transmission capacity. “This project reflects the growing need for high-voltage transmission infrastructure to connect regions, strengthen power networks and support electrification,” he said.
“We are proud to contribute our expertise to this landmark interconnection project that will play an important role in Greece’s electricity infrastructure,” Radue added. “The contract also supports significant activity across our manufacturing operations and further reinforces Nexans’ leadership in the high-voltage transmission market.”
PWR Transmission is one of Nexans’ three core businesses, alongside PWR Grid and PWR Connect. The company operates in 39 countries with 12,830 employees. It reported €6.1 billion in standard sales in 2025 and is listed on Euronext Paris.
Interconnections and grid modernisation
Nexans said that countries are accelerating investment in grid modernisation. As a result, high-voltage interconnections are becoming increasingly critical to connecting islands, remote regions, offshore renewable generation and growing demand centres. The company said it would work closely with Hellenic Cables and Asso.subsea to deliver the link and support power infrastructure in Greece and the Eastern Mediterranean.
Climate Global News has previously reported on Nexans’ selection by Red Eléctrica for the 132 kV Mallorca-Menorca power cable link, another island interconnection. The site has also covered the start of 525 kV HVDC cable production for TenneT’s LanWin2 offshore grid link.
Frequently asked questions
What is the Corinth-Kos interconnection?
It is a 1 GW, 320 kV HVDC interconnection in Greece that will connect the Dodecanese islands more closely to the Greek mainland. It comprises approximately 1,260 km of subsea cable and 30 km of land cable.
What will Nexans supply for the Corinth-Kos interconnection?
Nexans will deliver a 420 km mass-impregnated (MI) 110 kV cable system. The company describes it as a critical component of the HVDC link.
Who awarded the Corinth-Kos project?
The Independent Power Transmission Operator (IPTO) awarded the interconnection to Hellenic Cables, which is working in consortium with Asso.subsea. Nexans is a subcontractor to Hellenic Cables.
When will Nexans manufacture the cable for the Greek interconnection?
Nexans said project-related work on its MI cable production lines will use them from the end of 2026, throughout 2027 and up to mid-2028. A seabed survey has also been initiated.
Why are high-voltage interconnections important?
Nexans said high-voltage interconnections are becoming increasingly critical for connecting islands, remote regions, offshore renewable generation and growing demand centres as countries invest in grid modernisation.
