In September 2025, total net electricity generation in the OECD states reached 906.0 TWh. Of this, 438.5 TWh (48.4%) was produced from fossil fuels, 319.1 TWh (35.2%) from renewable sources and 144.4 TWh (15.9%) from nuclear power. On a year-to-date basis, total net electricity production increased by 2.0% during the first nine months of 2025.
Electricity generation from fossil fuels remained unchanged year-on-year. Natural gas accounted for 30.5% of total generation, decreasing by 1.5% (-4.3 TWh) y-o-y, and coal for 16.1% increasing by 2.8% (4.0 TWh) y-o-y and oil for 1.2%.
The decline in power generation from gas was mainly in OECD Asia Oceania (-10.8% y-o-y, -4.7 TWh), and the Americas (-0.4% y-o-y, -0.7 TWh), while it increased in OECD Europe (2.8% y-o-y, 1.1 TWh). Coal-fired electricity generation grew in OECD Asia Oceania (6.6% y-o-y, 3.2 TWh) and the Americas (6.1% y-o-y, 3.8 TWh), but fell in Europe (-10.2% y-o-y, -3.1 TWh). On a year-to-date basis, electricity generation from natural gas has fallen 1.0% (-24.7 TWh) whereas coal increased by 4.3% (+54.6 TWh) across the OECD.
Generation from renewable sources increased by 5.9% year-on-year (+17.9 TWh) in September 2025. The output from solar generation continues to increase (+23.5% y-o-y, +18.8 TWh). This trend was mainly driven by the Americas (34.4% y-o-y, 10.6 TWh), followed by Europe (21.1% y-o-y, 6.8 TWh) and Asia Oceania (8.2% y-o-y, 1.4 TWh). Wind generation increased year-on-year (+3.2% y-o-y, +2.6 TWh) while hydro declined by 4.0% (-4.4 TWH).
Nuclear power generation remained broadly stable in September 2025 with a slight decline of 0.2% year-on-year (-0.2 TWh), while it fell in Asia Oceania (-2.7% y-o-y, -0.6 TWh) and in OECD Europe (-3.1% y-o-y, -1.6 TWh) and increased in the Americas (2.8% y-o-y, 1.9 TWh). The highest increase on a year-to-date basis across all OECD regions was in Japan ( +13.5%, +8.5 TWh), while the largest fall occurred in Belgium (-22.6%, 5.1 TWh).
An unusual set of results was recorded in the September figures for Chile, which suffered a 19.4% fall (-388 GWh) in electricity generation from hydro. The country has seen lower hydro generation since the start of the year, with a 20.3% decline (-3,651 GWh) on a year-to-date basis. Over the same nine-month period, coal-fired power generation increased by 10.4% (+1,075 GWh), while power generation from natural gas remained relatively stable, showing a slight decrease of 0.7% (-79 GWh) year-to-date.
