Cyclades electrical interconnection enters final phase for Santorini, Milos, and Serifos
Phase 4 of the project brings a 50% reduction in PSO charges for lower household electricity tiers starting in 2027.
The fourth and final phase of the electrical interconnection linking the Cyclades to the mainland high-voltage grid is moving into full implementation, covering Santorini, Milos, and Serifos.
Upon completion, a 50% reduction in Public Service Obligation (PSO) charges is expected starting in 2027 for the primary household consumption tier, up to 500 kWh per month.
Sources
Kykladiki22 October 2026
Mykonea synthesis.
