Rio - Antirrion Interconnection
Domestic ReinforcementOperationalGR400 kV60 km2023
Also known as:Rio–Antirrio 400 kV, Rio-Antirrio interconnection, Διασύνδεση Ρίου-Αντιρρίου, Rio–Antirio 400kV submarine cable, Rio–Antirrio (Ρίο–Αντίρριο) 400 kV, Rio-Antirrion Interconnection, Rio–Antirrio submarine interconnection, Rio–Antirrio Intercon
Status:Operational
Project Company:IPTO S.A.
Type:domestic reinforcement
Website:www.admie.gr
Rio–Antirrio (2019) is a domestic extra‑high‑voltage AC (400 kV) submarine and land cable interconnection that extends the 400 kV transmission system between the Peloponnese (Rio) and mainland Greece (Antirrio). The scheme forms part of the so‑called “Western Corridor” to extend the 400 kV system to the Peloponnese and to link...
Supply Chain (3)
Project Timeline (2)
13 Jun 2023Commercial Operations Full Power
IPTO (the Greek transmission operator) placed the Western Corridor transmission line into full operation on 13 June 2023, marking the first time the Peloponnese was interconnected to Greece’s 400 kV Extra High Voltage System. As part of this corridor, a 400 kV dual‑circuit submarine interconnection between Rio and Antirrio—implemented by Hellenic Cables with design, manufacturing, installation, protection and connection of an 18 km submarine and associated land cable system—began full commercial service, enhancing power transfer capability to and from the Peloponnese and improving security and stability of the southern grid.
2019Geophysical Survey Complete
In 2019, a seabed geophysical survey was carried out along the planned route between Rio and Antirrio for the Rio–Antirrion interconnection, using techniques including Vibrocorer and CPT, to support cable route design for the installation of six high-voltage submarine cables for IPTO, with Fulgor and Hellenic Cable Industry involved in the project.