June 2025 will go down in history as the month when solar energy became the largest source of electricity in the European Union for the first time ever. According to data published by the think tank Ember, as much as 22.1% of all electricity generated in the EU that month came from solar panels. That’s more than from any other source—nuclear power followed closely at 21.8%, while wind energy accounted for 15.8% of the total.
Several factors contributed to this record-breaking result. First and foremost was the weather. June was exceptionally sunny across much of Europe, allowing solar installations to perform at their peak. Another key factor was the continued growth of solar capacity, both on an industrial scale and in residential settings. More and more EU member states are investing heavily in photovoltaic development. Interestingly, 13 countries—including the Netherlands, Greece, Germany, and Poland—broke their own national records for solar generation in June.
However, despite the success of solar, data from the first half of 2025 also show a rise in the use of fossil fuels—mainly natural gas. Compared to the same period in the previous year, electricity production from gas increased by 13%. This was partly due to weaker wind and hydro output earlier in the year, which forced the energy system to rely on more stable sources. At the same time, electricity demand grew by 2.2%, further shaping the overall energy mix.
The current situation highlights both the potential and the limitations of the energy transition. Solar power can play an increasingly central role, but its output depends on weather conditions and daylight hours. For renewables to truly lead the way, investment in system flexibility is essential—through energy storage, smart grids, and demand-side management. Only then can we sustainably reduce fossil fuel use and strengthen Europe’s energy security.
More information HERE
