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.