In July 2025, total net electricity generation in the OECD membership reached 1027.6 TWh, an increase of 2.3% compared to July 2024, according to the International Energy Agency’s Monthly Electricity Statistics. Of this total, 518.8 TWh (50.5%) was produced from fossil fuels, 352.2 TWh (34.3%) from renewable sources and 152.2 TWh (14.8%) from nuclear power.
Generation from fossil fuels increased by 1.1% year-on-year in July 2025 despite decreasing by 2.0% year-on-year (-6.6 TWh) from natural gas firing, while coal-fired generation increased by 7.3% year-on-year (+12.0 TWh). The shares of natural gas, coal and oil as a percentage of total electricity generation were 31.5%, 17.3% and 1.3%, respectively. The increase in generation from coal was driven primarily by the United States (+11.7% y-o-y, +8.7 TWh) and Korea (+24.5% y-o-y, +4.0 TWh).
From renewable sources generation increased by 6.1% year-on-year (+20.3 TWh) in July. The highest absolute increase came from solar power, which grew by 22.1% y-o-y (+21.6 TWh), bringing total OECD solar generation to 119.2 TWh (11.6% of total generation). The strongest year-on-year growth was in the OECD Americas, where solar increased by 34.3% y-on-y (+12.3 TWh) to 48.3 TWh, driven mainly by the United States (+38.7% y-o-y, +12.0 TWh). In Europe, solar increased by 12.9% y-on-y (+6.0 TWh) to 52.5 TWh, with the most notable absolute increase in Türkiye (+46.3% y-on-y, +1.7 TWh). In Asia Oceania, solar power generation increased by 21.4% year-on-year (+3.3 TWh).
Wind power generation in the OECD increased by 8.4% year-on-year (+6.2 TWh) reaching 79.4 TWh (7.7% of total generation). Conversely, hydropower decreased by 5.9% year-on-year (-7.8 TWh) to 123.7 TWh (12.0% of total generation), with Europe recording a 12.4% year-on-year decrease (-6.8 TWh).
Nuclear power declined by 2.0% y-on-y (-3.1 TWh) in July. Output in the Americas remained unchanged compared with the previous year, while Europe and Asia Oceania recorded falls of 4.4% (-2.4 TWh) and 5.2% (-1.2 TWh) y-on-y respectively. A notable fall in generation from nuclear power occurred in Switzerland, which nearly halved (-46.8% y-o-y, -1.0 TWh), owing to environmental constraints caused by a severe heatwave. High temperatures made river water used for cooling nuclear reactors exceed regulatory safety limits. Nonetheless nuclear power continued to represent a significant share of total electricity generation in the country, accounting for 18.1%.
