The International Energy Agency’s latest Electricity Statistics report shows that in June 2025 total net electricity generation in the OECD membership reached 922.6 TWh, an increase of 1.4 % compared to June 2024. Of this total, 416.8 TWh (45.2 %) was produced from fossil fuels, 358.6 TWh (38.9 %) from renewable sources and 143.2 TWh (15.5 %) from nuclear power.
Electricity generation from fossil fuels fell 1.8 % year-on-year in June 2025; from natural gas it fell by 2.1 % year-on-year (-5.5 TWh), while generation from coal decreased by 1.3 % year-on-year (-1.9 TWh). The shares of natural gas, coal and oil as a percentage of total electricity generation were 28.6 %, 14.9 % and 1.2 %, respectively. The fall in generation from natural gas was driven by OECD Asia Oceania (-8.4 % y-o-y, -3.2 TWh) and OECD Americas (-1.7 % y-o-y, -3.3 TWh), while generation increased in OECD Europe (3.0 % y-o-y, +1.0 TWh).
However generation from renewable sources increased by 7.3 % year-on-year (+24.4 TWh) in June. The highest absolute increase came from solar power generation (+24.7 % y-o-y, +23.5 TWh), bringing the total to 118.7 TWh (12.9 % of total generation). The highest year-on-year increase was in the OECD Americas, where the solar component increased by 28.6 % y-on-y (+10.2 TWh) to 46.0 TWh, driven by the USA (+32.3 % y-o-y, +10.0 TWh). In OECD Europe, solar increased 25.0 % year-on-year (+10.8 TWh) to 53.9 TWh. The most notable increase was in Lithuania with 303% y-on-y (+0.4 TWh) and +288 % year-to-date (+1.2 TWh).In OECD Asia Oceania solar power generation increased by 15.2 % y-on-y (+2.5 TWh), while wind generation increased 8.8 % year-on-year (+7.3 TWh), bringing the OECD wind power total to 89.7 TWh (9.7 % of total generation). On the other hand, hydropower generation in the OECD decreased by 2.7 % year-on-year (-3.8 TWh) to 135.2 TWh (13.3 % of total generation). Hydropower generation in OECD Europe fell by 5.3% year-on-year (-6.8 TWh).
Nuclear power generation decreased 2.3% y-on-y (-3.4 TWh) in June 2025. OECD Asia Oceania registered a constant y-o-y nuclear generation total, while in OECD Europe and the OECD Americas it decreased 2.7 % (-1.4 TWh) and 2.7 % (-2.0 TWh) year-on-year, respectively.
Significantly, solar power became the leading source of electricity in OECD Europe for the first time in June, contributing 19.9 % (53.9 TWh) of net electricity generation. together, solar and wind reached a record share, supplying 35.8 % (97.0 TWh) of total electricity production.
