Electricity production in OECD countries grew by 2.5% in October 2025 compared with the same month last year, according to the International Energy Agency (IEA). The increase was supported by higher output from both fossil fuels and renewable energy, even as nuclear generation declined.

Total electricity generated reached 883.8 terawatt-hours (TWh). Fossil fuels provided the largest share at 46.6% (411.8 TWh), renewables accounted for 37.3% (329.8 TWh), and nuclear power made up 15.6% (138.0 TWh).

Among fossil fuels, natural gas remained the main source, contributing 29.2% of total electricity. Coal accounted for 15.5%, and oil 1.3%. Gas-fired generation rose 2.1% overall, led by Europe, which offset declines in the Americas and Asia Oceania. Coal generation increased in the Americas and Asia Oceania but fell sharply in Europe.

Renewable energy production grew faster than fossil fuels, rising 4.7% year on year. Solar power led the gains with an 18.2% increase, followed by wind generation at 10.1%. Hydro power, however, declined by 7.9%. The growth in renewables was strongest in the Americas, followed by Europe and Asia Oceania.

Nuclear power output fell by 4.1%, with the biggest decline in Asia Oceania due to reduced generation in South Korea. Europe and the Americas also saw smaller drops in nuclear production.

Some countries showed notable changes in fuel mix. In Spain, electricity from oil rose sharply while coal-based generation fell, signaling a shift from coal to oil. Despite this, natural gas remained the main fossil fuel source.

The data highlights how electricity generation is increasingly shifting toward renewables and gas, even as nuclear and coal use decline in certain regions.