According to the Greek Distribution Network Development Plan 2026–2030 appendices, the medium-voltage submarine interconnection between Schinoussa and Iraklia consists of a single 3 x 35 mm² copper (Cu) 15 kV cable, with a length of 4.6 km, which was installed and commissioned in 1983 under the Syros distribution region. This indicates completion of the cable installation for the Schinoussa–Iraklia link in 1983.
The medium-voltage submarine interconnection between Schinoussa and Iraklia, a 4.6 km island-to-island 15 kV (3 x 35 mm² Cu) cable listed in the HEDNO 2026–2030 network development plan table of existing MV submarine links with year 1983, is part of the Cyclades network that already supplies Schinoussa and Iraklia via existing submarine interconnections to the mainland system.