Solar beats nuclear in June, becoming EU’s biggest electricity source for first time

Solar became the EU’s largest source of electricity for the first time in June 2025. National records for both photovoltaics and wind rolled in in May and June, pushing coal to an all-time low.

Solar was the largest source of electricity in the European Union for the first time last month, with multiple countries producing record amounts of solar power, Ember found. Wind power achieved the highest ever generation for the months of May and June, the think tank said.

Solar power generated 22.1% of EU electricity (45.4 TWh) in June, more than any other power source. It was a year-over-year increase of 22%. In second place was nuclear, with 21.8% (44.7 TWh), followed by wind, with 15.8% (32.4 TWh).

The big opportunity now comes from adding battery storage and flexibility to extend the use of renewable power into mornings and evenings, where fossil fuels still set high power prices, according to Ember’s Senior Energy analyst Chris Rosslowe.

At least thirteen EU countries set monthly solar records

At least thirteen countries recorded their highest-ever month of solar generation, amid an ongoing surge in photovoltaic installations. Among them were Bulgaria, Croatia, Greece, Slovenia and Romania, all the EU countries in the region that Balkan Green Energy News is focused on except Cyprus, for which there was no data for June.

Wind power reached an all-time high shares of 16.6% (33.7 TWh) and 15.8% (32.4 TWh) in May and June, respectively

Strong photovoltaic output helped the power system to handle higher levels of demand resulting from heatwaves that gripped the continent towards the end of the month, according to the report.

Wind farms generated 16.6% (33.7 TWh) and 15.8% (32.4 TWh) of EU electricity in May and June, respectively. It was an all-time high for both months. Notably, at the start of the year, wind conditions were relatively poor. They improved, and they were the main driver, though capacity has been continuously growing over the past year. Several large offshore wind farms were commissioned.

Coal falls to record low

As a result of high renewables generation in June, coal had the lowest-ever share of EU electricity. Total fossil generation was also low, but it grew in the entire first half of the year on an annual basis.

Coal generated just 6.1% (12.6 TWh) of EU electricity in June, down from the 8.8% registered in the same month of last year.

The two countries that account for the vast majority of EU coal power (79% in June) both saw record lows in June. Namely, Germany generated just 12.4% (4.8 TWh) of its power from coal, and Poland 42.9% (5.1 TWh). Four other countries recorded their lowest-ever month of coal generation in June: Czechia (17.9%), Bulgaria (16.7%), Denmark (3.3%) and Spain (0.6%), which is approaching its coal phaseout.

Fossil fuels generated 23.6% (48.5 TWh) of EU electricity in June, just above the record low of 22.9% in May 2024. Nevertheless, fossil generation in the first half of 2025 was 13% higher (by 45.7 TWh) than in the first half of 2024, mainly due to a jump in gas generation by 19% or 35.5 TWh. Lower hydropower (due to drought) and wind generation than last year, and increasing demand marked the period.

Electricity demand continued on an upward trajectory. In the first half of 2025, the EU consumed 1.31 PWh of electricity or 2.2% more than in the same period of last year.