Solar tops EU power mix for first time in June, Ember says

Solar power became the European Union's largest electricity source for the first time in June, generating 22.1% of the bloc's power and surpassing nuclear and wind, driven by record sunshine and continued installations. This milestone coincided with coal's contribution falling to an all-time low of 6.1%. However, despite strong June renewable output, overall fossil fuel usage in the first half of 2025 increased by 13% year-over-year, largely due to higher gas generation offsetting earlier weak hydro and wind, underscoring the ongoing challenge of expanding battery storage and grid flexibility to reduce fossil fuel reliance during non-solar hours.

Analysis

Solar power achieved a significant milestone in the European Union's energy transition, becoming the largest source of electricity for the first time in June by generating 22.1% of the bloc's power, up from 18.9% a year prior. This record output of 45.4 TWh, driven by favorable weather and expanded capacity, surpassed both nuclear (21.8%) and wind (15.8%). The ascendancy of solar coincided with a structural decline in coal, which fell to a record-low 6.1% share of the electricity mix, with even major coal consumers like Germany and Poland recording historic monthly lows. However, this positive development in June is contrasted by data from the first half of 2025, which saw a 13% year-over-year increase in fossil fuel usage. This rise was primarily fueled by a 19% increase in natural gas generation, utilized to compensate for weak hydro and wind output earlier in the year and to meet a 2.2% rise in overall EU electricity demand. This highlights the critical, persistent challenge of intermittency and underscores the urgent need for expanded battery storage and grid flexibility to reduce reliance on fossil fuels during periods of low renewable generation.

Key Decisions for Investors

• The confirmed rapid growth of solar power, coupled with the identified need for grid stability, points to significant investment opportunities in battery storage and grid flexibility technologies, which are essential to address renewable intermittency.
• The accelerating decline of coal to a record low of 6.1% of the EU power mix reinforces a bearish outlook for assets tied to European coal-fired generation, suggesting investors should limit or hedge exposure to this sector.
• Despite the long-term renewable push, the 19% surge in gas generation during the first half of the year underscores its continuing role as a crucial transition fuel, presenting medium-term opportunities for investments in flexible gas infrastructure and power plants needed to balance the grid.