OECD

In July 2025, total net electricity generation in the OECD reached 1027.6 TWh, an increase of 2.3% compared to July 2024. 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.

Electricity generation from fossil fuels increased by 1.1% year-on-year in the OECD in July 2025. Electricity generation from natural gas decreased by 2.0% year-on-year (-6.6 TWh), 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 electricity 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).

Electricity generation from renewable sources in the OECD increased by 6.1% year-on-year (+20.3 TWh) in July 2025. 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 power generation increased by 34.3% year-on-year (+12.3 TWh) to 48.3 TWh, driven mainly by the United States (+38.7% y-o-y, +12.0 TWh). In OECD Europe, solar power generation increased by 12.9% year-on-year (+6.0 TWh) to 52.5 TWh, with the most notable absolute increase in the Republic of Türkiye (+46.3% year-on-year, +1.7 TWh). In OECD 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 generation in the OECD decreased by 5.9% year-on-year (-7.8 TWh) to 123.7 TWh (12.0% of total generation), with OECD Europe recording a 12.4% year-on-year decrease (-6.8 TWh).

Nuclear power generation in the OECD declined by 2.0% year-on-year (-3.1 TWh) in July 2025. Output in the OECD Americas remained unchanged compared with the previous year, while OECD Europe and OECD Asia Oceania recorded decreases of 4.4% (-2.4 TWh) and 5.2% (-1.2 TWh) year-on-year, respectively.

Highlight of the month

In July 2025, electricity generation from nuclear power in Switzerland nearly halved year-on-year (-46.8% y-o-y, -1.0 TWh), due to environmental constraints caused by a severe heatwave. High temperatures made river water used for cooling nuclear reactors exceed regulatory safety limits. Despite this sharp decline, nuclear power continued to represent a significant share of total electricity generation in the country, accounting for 18.1%.