Second HVDC link from mainland Greece to Crete coming online

Greece’s Independent Power Transmission Operator (IPTO) is completing the last elements of the Ariadne Interconnection project, one of the deepest subsea links in the world. The company plans to switch on the double high-voltage direct current (HVDC) cable between Attica and Crete by the end of the month. In addition, IPTO and its Italian counterpart Terna are developing a project for a second interconnector between them.

Final tests and equipment checks are being completed at the Damasta Converter Station in Heraklion ahead of the start of the trial operation of the Crete-Attica electricity link. The management of IPTO, also known by its Greek acronym Admie, and the HDVC Ariadne Interconnection project firm inspected the site.

The transmission system operator said it plans to energize it this week by injecting reactive power into the electricity system in the country’s biggest island.

The transmission of active power from Attica to Crete is set to begin in late May, the update adds. Ariadne consists of two 500 kV cables of  500 MW each. One end is in Pachi in the city of Megara, between Athens and Corinth, and the other one in Korakia in Crete. The submarine and underground cables were tested earlier.

Line on mainland is under trial electrification

At the same time, on the Attica side, a trial electrification of a 400 kV cable system is taking place between the Koumoundouros Converter Station and the adjacent Extra High Voltage Center. Ariadne Interconnection is the largest and most complex electricity transmission project in Greece so far, IPTO underscored.

Furthermore, a 150 kV transmission line between Chania and Damasta recently received the decision on the approval of environmental conditions (AEPO), the company added. It is considered necessary for an optimal combined use of Crete’s two interconnections with the mainland, the announcement reads. The first one, from Peloponnese, was established in 2021.

Ariadne, worth more than EUR 1.1 billion, is one of the three deepest interconnections in the world. The HVDC line’s capacity matches the interconnector to Sardinia, the strongest power link so far with an island.

The project is 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. The idea for the endeavor dates back to the 1990s.

The contractors are Nexans and Prysmian. Each was responsible for one of the two cables while the latter also laid two submarine telecommunication lines.

Erdoğan again taunts Great Sea Interconnector by promising alternative cable

Ariadne is part of a proposed corridor with the Great Sea Interconnector project, formerly EuroAsia Interconnector, envisaged going to Cyprus and Israel. The Crete-Cyprus investment has been suffering heavy delays amid financing issues, ownership disputes and Turkey’s threats.

In early May, President Recep Tayyip Erdoğan visited the Cypriot Turkish breakaway republic, recognized only by Turkey, and promised an interconnection with his country. He compared it to an existing water pipeline.

“Did we bring water from under the sea to Northern Cyprus from Turkey? Now we are in the second stage. God willing, we will bring electricity and with that we will cover the needs of Northern Cyprus in water and electricity,” Erdoğan stated.

Notably, IPTO denied yesterday a press report that it is considering the possibility, together with Nexans, the contractor, to alter the route and connect Crete with the Dodecanese Islands instead of with Cyprus. The archipelago includes Rhodes, Astypalaia (Astypalea), Kos and Tilos.

EBRD is providing a grant for the first studies for an interconnection between Greece and Egypt

In other news, the European Bank for Reconstruction and Development (EBRD) and Elica Interconnector, a member of the Copelouzos Group, signed a grant agreement for the first studies for the planned Egypt-Greece (GREGY) electricity interconnection.

IPTO and its Italian counterpart Terna signed today a memorandum of understanding to install a second undersea HDVC power line. The GR.ITA 2 project is for a double cable, two times 500 MW, scheduled for completion in 2031. The two sides earmarked a total of EUR 1.9 billion.

The existing 500 MW interconnector, in operation since 2002, is temporarily down due to a malfunction.