The electricity interconnection of Crete with the Peloponnese is a major project, both in terms of cost and in terms of technical complexity, as it is the largest in length and depth under construction of cable (underwater and underground) alternating current (EP) interconnection worldwide. The present project concerns Phase I of the overall project, which makes it possible to supply a significant part of the island’s load from the National Electricity Transmission System (NSMIE) and, in combination with Phase II of the interconnection of Crete in Attica, leads to the complete depopulation of the island from the oil-fuelled plants, which until now ensured its energy efficiency. These two interconnections achieve energy efficiency with a lower environmental footprint. At the same time, the replacement of oil significantly reduces the cost of electricity supply of the island, allowing the de-escalation of charges for Public Utilities Services in the accounts of consumers throughout the country. This is a project of strategic national importance, with great added value, which has been identified by the Ministerial Decision of the Minister for Energy, Electricity, Energy, Energy, Electricity, Energy, Energy, Energy, Electricity and Energy, with a high added value. 184578/12.12.2017 as a project “of more general importance for the country’s economy”. The two phases of Interconnection constitute the largest project in terms of budget, technological innovation and complexity that has been implemented to date in the Greek Electricity Transmission System.