Renewables keep top spot in Greece’s power mix despite surge in curtailments

Renewable energy sources continued to rank first in Greece’s electricity mix despite significant curtailments in the first half of 2025, which more than doubled against the same period a year earlier. At the same time, gas-fired power generation hit a 10-year high, while coal’s share in covering domestic demand fell to the lowest level in at least a decade, according to a recent analysis by the Green Tank.

In the year through June, curtailments totaled 1,327 GWh, equivalent to 9.6% of Greece’s overall renewables output, compared to 513 GWh in the same period last year and 899 GWh in the whole of 2024.

Curtailments in June 2025 reached 351.7 GWh, which means renewable energy generation could have been 12.3% higher. The level compares to only 59.5 GWh, or 2.5%, rejected in June 2024. Most curtailments in June occurred between 10 am and 3 pm, with the highest daily amount, of 32.7 GWh, recorded on June 1.

In May 2025, curtailments were 382.5 GWh, up from 127.3 GWh a year earlier, and in April they totaled 359.1 GWh, compared to 253.3 GWh in the same month of 2024. In March, the grid rejected 229 GWh of renewable electricity, up from 73.3 GWh in March 2024, while curtailments in February and January amounted to 3.4 GWh and 1.3 GWh, respectively, compared to zero in the first two months of 2024.

Renewables covered 46% of Greece’s electricity demand in H1 2025

Greece’s electricity demand in the first half of 2025 reached 27,038 GWh, with renewables covering 46%. The only equivalent period so far when the share was higher was last year. In June, electricity demand jumped 22% against May, to 5,094 GWh. The average market price remained low, at EUR 85.4 per MWh, the Green Tank noted.

Renewables ranked first in electricity generation in H1 2025, with a total of 12,435 GWh, a marginal increase from 12,354 GWh in H1 2024.

Gas-fired power generation reached 10,925 GWh in the first half of 2025 or 19.3% more than one year before, hitting a 10-year high. The rise was mostly driven by an increase in net exports and electricity demand. A drop in output in the segments of hydropower lignite and oil also contributed, together with an expansion of the gas power fleet.

Gas covered 40.4% of electricity demand in the first six months of the year, after 34.1% in the comparable period of 2024.

Coal power production fell steadily from January to June

Coal, on the other hand, covered just 5.2% of Greece’s power demand in H1 2025. It was the lowest share in at least a decade. Electricity production from lignite declined steadily in the first six months of the year, from 511 GWh in January to just 66 GWh in June.