Greece launches Attica-Crete subsea power interconnector

The Attica-Crete subsea power interconnector has been put into trial operation, marking a milestone for Greece’s transmission system. The country now has a high-voltage direct current (HVDC) interconnection, and its largest island is fully integrated into the national electricity system, according to an announcement by the Independent Power Transmission Operator (IPTO or Admie).

The Ariadne subsea power interconnector entered into operation on May 24 with the successful transfer of direct current electricity, said IPTO, whose subsidiary Ariadne implemented the project. The trial operation phase is expected to last throughout the summer, IPTO added.

The two submarine power links have ended Crete’s electrical isolation

Combined with the existing interconnection via the Peloponnese peninsula, the new cable has completely ended Crete’s electrical isolation, making it an energy hub with significant environmental and economic benefits for the country and the local community, according to IPTO.

The first power link between Crete and the mainland is the 174-kilometer alternating current (AC) cable linking the island with the Peloponnese. It was completed in 2021, following an investment of EUR 380 million.

The EUR 1.1 billion Ariadne interconnector is among the deepest in the world

The Ariadne interconnector, which cost over EUR 1.1 billion to build, is one of the deepest subsea power cables in the world. It consists of two 500 kV cables of 500 MW each, laid at depths of up to 1,200 meters. The construction lasted 4.5 years.

Greek Minister of Environment and Energy Stavros Papastavrou stated that the new power link has made Crete a “central pillar in the country’s energy transition,” and IPTO CEO Manos Manousakis claimed it is opening “a new chapter for the island’s energy security.”

The project was co-financed through the National Strategic Reference Framework (NSRF 2014-2020 and NSRF 2021-2027), via the European Union, with up to EUR 535.5 million.

IPTO recalled that the project consisted of many large subprojects, with contractors including Siemens, Terna, Nexans, Prysmian, NKT, and Hellenic Cables.