A record monthly electricity production from RES (2,992 GWh) occurred in August despite high curtailments (231 GWh). With lignite significantly reduced (74 GWh) and gas slightly reduced (2,024 GWh), the average wholesale market price was 73.16 €/MWh, a 16-month low. The first eight months of 2025 saw record highs for exports (1,420 GWh) and gas (15,413 GWh). However, net sources outperformed fossil fuels by 602 GWh, meeting 52.6% of demand.
This analysis concerns electricity production across the entire territory of Greece and is based on the latest available monthly data from the Independent Power Transmission Operator (IPTO) for the interconnected grid (August 2025) and from the Hellenic Electricity Distribution Network Operator (HEDNO) for the non-interconnected islands (July 2025). In addition, we use the most recent data from HEDNO for low and medium voltage, as well as for the installed capacity of self-production systems (April 2025). Data from the Renewable Energy Special Account bulletin of the Renewable Energy Sources & Guarantees of Origin Operator (DAPEEP) (July 2025) are used to calculate more accurately CHP production at low and medium voltage, as well as for the PV utilization factors needed to estimate self-production. Finally, for the wholesale electricity market we use hourly price data of the Day-Ahead Market from ENTSO-E. You can read in more detail about our methodology here.
The month of August
In August 2025, renewables (mainly wind and solar) reached a historic high of 2,992 GWh of monthly electricity production, continuing the upward trend that started in April. Compared to July 2025, RES were up 3.9%, an increase of 30% compared to August last year.
Fossil gas ranked second after renewables with 2,025 GWh, down 18.6% from July and 8% below last year’s August levels.
Large hydro returned to June levels with 335 GWh, down 18% from July and down 19% from August last year.
Lignite production fell to 74 GWh, marking the second lowest level since June 2025. It was the lowest August production on record for lignite and down 74% from last year.
Total domestic demand (5,553 GWh) was down 13.8% from July and down 5% from August 2024.
In terms of the interconnection balance, Greece increased net exports in August by 150% compared to July, reaching 457 GWh, the highest level for 2025 and the second highest after last November (646 GWh), at least since 2013.
The average price on the wholesale energy market in August 2025 was 73.16 €/MWh, the lowest price for 2025 and in the last 16 months. It decreased by 27% compared to July and by 43.6% compared to August last year. This decline is related to the reduction of fossil fuels (mainly lignite and gas) in the electricity generation mix and the rise of renewables to historically high levels.
The first eight months of the year
Comparison of sources
In the first eight months of 2025, renewables led the way in electricity production with 18,303 GWh cumulatively and a decade high, while they also increased by 5.8% since the same period last year.
Fossil gas followed with 15,413 GWh cumulatively, marking a high and a 12% increase over the first eight months of 2024.
The country’s net exports were also at an all-time high, reaching 1,420 GWh for the first eight months of 2025.
Oil ranked third in electricity production after renewables and gas, with 2,681 GWh cumulatively for the eight months. This was followed by large hydro with 2,206 GWh cumulatively for the eight-month period, down 17.4% compared to the same period in 2024. Lignite came in last place with 1,813 GWh and the lowest historical electricity production for the January to August period.
Shares of sources in meeting demand
Domestic electricity demand in the first eight months of 2025 was 39,008 GWh, very close to the levels of the corresponding period in 2024. However, domestic electricity production increased by 5.3% in 2025 compared to 2024 (from 39,221 GWh in 2024 to 41,310 GWh in 2025) in order to meet the electricity needs of neighboring countries.
Renewables, with a 46.9% share, met most of the demand. The steady rise in recent months has put renewables in first place with the largest share in covering demand in the eight-month period for the last decade.
Gas ranked second with 39.5% and a historically high share. In third place after renewables and gas was oil, which met 6.9% of total demand and more than 90% of demand on non-interconnected islands.
In the penultimate place was large hydro with a 5.7% share, while lignite ranked ast with a 4.6% share and the lowest share in meeting demand in the first eight months of the year.
Changes in the sources of demand coverage
Comparing the January-August period of 2025 with the corresponding period of 2024, the largest changes occurred in the interconnection balance and in gas. Gas increased by 1,651 GWh cumulatively for the first eight months, while net exports increased by 1,946 GWh.
Renewables increased by 1,003 GWh, thanks to a steady upward trend over the last four months, while demand decreased by 106 GWh. The increase in renewables in the first eight months was mainly due to increased PV production, which offset the reduced production from wind, despite signs of recovery in August. Indicatively, production from photovoltaics connected to the high-voltage network was up 1,482 GWh from 2024, while wind production connected to the high-voltage network fell by 574 GWh.
Large hydro and lignite saw a drop in the first eight months of 2025 compared to the same period in 2024, by 464 GWh and by 355 GWh, respectively. Oil remained at similar levels, showing a slight increase of 5 GWh.
The increase in renewables (+1,003 GWh) was enough to offset the decrease in production from large hydro (-464 GWh) and lignite (-355 GWh). Thus, the huge increase in gas in the first eight months (+1,651 GWh) was mainly channeled to increase net exports (+1,946 GWh) and not to meet domestic needs.
The corresponding percentage changes in the first eight months of 2025, compared to the same period in 2024, were:
Lignite: -16.4 %
Fossil gas: +12.0 %
Renewables: +5.8 %
Large hydro: -17.4 %
Net imports: -369.7 %
Oil: +0.2 %
Demand: -0.3 %
Comparison of clean energy with fossil fuels
In the first eight months of 2025 and for the first time in 2025, clean energy sources (wind, PV, hydro, biomass, self-generation) with a total production of 20,509 GWh exceeded fossil fuels (fossil gas, lignite, oil). The difference between clean energy and fossil fuels is 602 GWh, with clean sources meeting 52.6% of total demand.
Energy curtailment from RES
Based on the combination of forecasts shown in the ISP2 and ISP3 solutions of the consolidated planning process of the IPTO, RES curtailments in August increased compared to July, reaching 231 GWh, accounting for 7.2% of the total RES generation and close to the curtailment levels of March. In comparison, the corresponding August 2024 curtailments were 39.3 GWh or 1.7% of the respective monthly RES generation.
Most RES curtailments in August occurred between 10am and 2pm, while the day with the highest curtailments was Sunday August 10th, 2025, with a total of 27.7 GWh.
Cumulatively, in the first eight months of 2025, 1,616 GWh or 8.1% of total RES production was rejected. This is more than double the RES curtailments of the same period in 2024 (585 GWh).
