Solar power became the European Union’s largest source of electricity in June 2026, supplying 25% of total generation and overtaking nuclear power for only the third month on record.
Photovoltaic installations produced approximately 52 TWh during the month. Nuclear accounted for 21% of the EU generation mix, followed by natural gas at 15%, wind at 14%, hydropower at 12% and coal at 8%.
The result reflects several years of rapid capacity additions rather than an isolated weather event. Installed solar capacity across the EU expanded by more than 20% annually between 2021 and 2025, giving photovoltaic generation an increasingly decisive role during spring and summer daylight hours.
Germany recorded one of the highest solar contributions, with photovoltaic plants supplying 36% of national electricity demand during June. Spain reached 34%, while Poland generated 24% of its electricity from solar despite the continuing importance of coal in its power system.
The shift has immediate consequences for wholesale price formation. Additional photovoltaic output is increasingly compressing midday prices, reducing thermal-unit running hours and concentrating merchant value in the evening ramp. Electricity markets are no longer assigning the highest value simply to annual renewable output; dispatch profile, grid location and the ability to deliver power after sunset are becoming equally important.
That change is already visible in Southeast Europe. Solar-heavy markets can move from deeply discounted midday prices to scarcity pricing within several hours. On 15 July, for example, Greek day-ahead electricity fell to €30.50/MWh during the solar-intensive period before rising to almost €197/MWh in the evening. Hungary moved from €90.10/MWh to €275.80/MWh, while Slovenia reached more than €372/MWh.
The growing solar share strengthens the commercial case for battery storage, flexible hydropower, demand response and improved cross-border transmission. It also raises curtailment and capture-price risks for photovoltaic projects developed without storage or a clearly structured industrial offtake profile.
Solar’s 25% EU market share therefore marks more than a generation milestone. It signals that Europe is entering a phase in which renewable deployment must be accompanied by investment in grids, storage, forecasting and flexible consumption. The electricity itself is becoming abundant during daylight hours; dependable delivery during constrained periods is becoming the more valuable product.
