Crete-Attica Power Link Nears Completion After Final Testing Phase Begins

07:53 9/5/2025 - Πηγή: iEfimerida

Greece is in the final stages of a major national energy project, with testing nearing completion at the Damasta Conversion Station in Heraklion, paving the way for the trial operation of the Crete-Attica electricity interconnection, according to the Independent Power Transmission Operator (ADMIE).

Executives from ADMIE and its subsidiary, Ariadne Interconnection, recently inspected the completed facilities at Damasta. 

The station is expected to be energized within the coming week, initiating the injection of reactive power into Crete’s grid.

On the Attica side, test electrification is already underway for the 400kV cable system linking the Kounoupidiana Conversion Station with the nearby Extra High Voltage Center, the main connection point to Greece’s mainland grid. 

Full system trials are scheduled to begin later this month.

As the country’s largest and most complex electricity transmission project ever undertaken, the Crete-Attica interconnection will soon begin transferring active power from the mainland to Crete, with initial flows expected by the end of May.

Comprehensive equipment testing has been ongoing since early 2025 at both conversion stations in Attica and Crete. The successful trial connection of the 150kV GIS substation at Damasta with Crete’s grid marked a significant milestone, along with full testing of the 500kV cables, both underwater and underground, that link the two regions.

A significant supporting development also progressed with the recent approval of environmental terms for a new 150kV transmission line between Chania and Damasta.

The line is considered essential for maximizing the joint operation of Crete’s two grid connections — via Attica and the Peloponnese.

ADMIE Chairman and CEO Manos Manousakis said the interconnection is now “counting down to being plugged in,” noting that Crete will soon benefit from dual links to the mainland for improved energy security, reducing its dependence on local generation.

“The next milestone is the trial operation starting in late May with the transfer of active power from Attica to Crete, followed by full commercial use,” Mr. Manousakis said.

“The recent environmental approval for the high-voltage line between Chania and Damasta is equally critical, ensuring optimal performance of both grid links. I want to thank the regional and local authorities in Crete for their valuable cooperation.”

The Crete-Attica interconnection is co-funded by the EU’s 2021–2027 NSRF program, securing up to €535.5 million in European and national funds, significantly lowering the overall project cost for Greek consumers.

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