The project budget amounts to €809.1 million, and its award will be based on the most economically advantageous bid. The construction phase is scheduled to last 48 months from the signing of the contract.
On the mainland, the Transmission System Operator’s (TSO) plan foresees the installation of the Converter Station in the Korfo area of Corinth, near the new Corinth Ultra-High Voltage Center, while on Kos, it will be located in the Mastichari area, close to the landing point of the submarine electrical cables.
The Converter Stations will incorporate Voltage Source Converter (VSC) technology, similar to that used in the Crete–Attica interconnection, to convert alternating current (AC) to direct current (DC) and vice versa, ensuring reliable and efficient electricity transmission along the entire length of the submarine line.
With the tendering of the contracts for the Converter Stations, the GIS Substation, and the submarine and land cable systems, which began in December 2025, ADMIE has now set in motion the construction of the entire second high-voltage direct current (HVDC) island interconnection to be implemented within the Greek electricity transmission system.
The Corinth–Kos electrical interconnection represents the first phase of the broader Dodecanese interconnection project, through which Rhodes and Karpathos will subsequently be connected to the high-voltage network via 150 kV alternating current (HVAC) cables.
The Dodecanese electrical interconnection will provide significant environmental and economic benefits, reducing the cost of electricity supply to the islands, as has already been achieved on the islands connected by ADMIE to date.
