In June 2025 C.E., the sun became the European Union’s single largest source of electricity — a milestone that would have seemed implausible just a decade ago. Solar panels across the continent generated 22.1% of the E.U.’s total power that month, edging out every other energy source, including natural gas and nuclear, to claim the top spot for the first time in history.
At a glance
- Solar power share: Solar reached 22.1% of the E.U.’s electricity mix in June 2025 C.E., making it the single largest source for the first time ever.
- Record-breaking generation: At least 13 E.U. countries posted their highest-ever monthly solar output that same month, driven by strong sunshine and growing installed capacity.
- Coal at record low: The solar surge helped push coal-fired generation down to just 6.1% of the electricity mix — its lowest share on record.
Why this moment is different
Solar has been climbing steadily for years, but hitting the top position in a 27-nation bloc with a population of roughly 450 million people is a different kind of threshold. It signals that clean energy is no longer a supplement to fossil fuels in Europe — it is competing directly for the top slot.
The results came from Ember, an independent energy think tank that tracks European power generation in near real time. Their data showed that the record wasn’t built on a single country’s performance. It was distributed across the continent, with nations from Spain to Poland contributing to the surge. That breadth matters: it suggests the transition is structural, not seasonal or regional.
Favorable weather played a role, as June tends to be sunny across much of Europe. But weather doesn’t explain the underlying capacity that made it possible. Years of growing global renewable investment built the infrastructure that captured that sunshine and turned it into electricity at scale.
What the numbers mean for fossil fuels
Coal’s fall to 6.1% of the power mix is just as significant as solar’s rise. Coal was once the backbone of European electricity. As recently as 2015 C.E., it supplied roughly 25% of E.U. power. That share has now collapsed — and not by accident.
The European Environment Agency tracks the E.U.’s broader energy transition and has documented how the combination of carbon pricing, renewable subsidies, and efficiency standards has steadily squeezed fossil fuel generation. Solar and wind together now routinely undercut coal and gas on price, which accelerates the displacement.
Low-cost renewables are also reshaping wholesale electricity markets. When solar generation peaks in the middle of sunny days, it can push wholesale prices down sharply — good news for industrial consumers and households, though it creates financial pressure for generators who need stable revenue to invest in new capacity.
The path to 2030
The E.U. has committed to getting 42.5% of its total energy consumption — not just electricity, but heating, transport, and industry as well — from renewables by 2030 C.E. The European Commission describes that target as ambitious but achievable. June 2025 C.E.’s electricity numbers suggest the electricity sector is running ahead of schedule.
Still, electricity is the easier part. Heating buildings and decarbonizing heavy industry remain harder problems, and progress there has been slower.
Even within the electricity sector, real challenges remain. The residential solar market has slowed in several countries, partly because lower electricity prices have reduced the financial payback period for rooftop panels, and partly because some government support schemes have been scaled back. Battery storage — needed to smooth out the natural variability of solar — is growing but not yet deployed at the scale the grid will eventually require. Grid upgrades to move power from where it’s generated to where it’s needed are expensive and slow.
None of that diminishes what June 2025 C.E. demonstrated. Solar topping the E.U. power mix is the kind of milestone that tends to accelerate what follows — it shifts assumptions about what’s possible, attracts more investment, and raises the ambition of future targets.
For a region that not long ago was heavily dependent on imported fossil fuels, that shift in assumptions may be the most consequential thing of all. And as renewables now account for nearly half of global power capacity, Europe’s milestone lands in a world that is already moving in the same direction.
Read more
For more on this story, see: Good News for Humankind — Solar was E.U.’s biggest source of power in June 2025
For more from Good News for Humankind, see:
- Renewables now make up at least 49% of global power capacity
- U.K. cancer death rates down to their lowest level on record
- The Good News for Humankind archive on climate and energy
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