The recent interconnection of Crete’s electricity grid with mainland Greece marks a significant shift in the island’s energy landscape, notably reducing its reliance on oil-fired power generation. This transition is expected to have profound implications for both operational efficiency and cost management in the region’s energy sector.
Data from the distribution system operator DEDDIE reveals that oil-fired electricity production in Crete plummeted by 91 percent in the first quarter of the year, with local thermal plants generating merely 26,500 MWh compared to approximately 305,000 MWh during the same period last year. This drastic reduction underscores the impact of the new interconnection on the island’s energy mix.
The decline was particularly pronounced at the beginning of the year, with oil-fired generation dropping to just 630 MWh in January and 211 MWh in February. In contrast, production had previously exceeded 100,000 MWh in those months last year. A temporary increase to around 26,700 MWh was noted in March following a scheduled maintenance shutdown of the interconnection system, which allowed for essential repairs before the summer season. Post-maintenance, electricity imports from the mainland resumed, effectively meeting nearly all of Crete’s energy demands.
As of December, the transmission connection achieved full operational capacity, positioning 2026 as a pivotal year when Crete is projected to rely almost entirely on electricity from the national grid. This shift is expected to result in annual oil-fired electricity production declining to approximately 100,000 MWh, a stark contrast to the average yearly output of about 1.55 million MWh over the past three years. This translates to an estimated 94 percent reduction in oil-based electricity generation.
The financial ramifications of this transition are equally significant. Public service obligation costs associated with maintaining oil-fired generation capacity are anticipated to decrease dramatically, with projections indicating expenses will total around 100 million euros this year—down from an average of approximately 550 million euros over the last three years. This change could yield annual savings nearing 450 million euros.
With total construction costs for the interconnection project amounting to 1.15 billion euros, stakeholders expect a swift recovery of investment within three years due to lower operating costs and diminished system support expenditures. This development not only underscores economic benefits but also highlights potential environmental advantages as Crete moves towards a more sustainable energy future.
