OECD Nations Pass Point of No Return on Fossil Fuel Power, Renewables Take Over

Wind and solar have more than replaced lost coal generation across all 38 OECD member countries, marking what analysts call a permanent structural shift in how developed economies produce electricity.

Fossil fuel electricity generation in OECD nations has fallen 19 percent below its historical peak, according to new data, with the decline driven by substitution rather than reduced demand. Total electricity consumption continued rising throughout the transition, meaning renewables did not simply fill a gap. They outgrew it.

Coal Takes the Hardest Hit

Coal led the fossil fuel retreat. Generation from coal peaked at 3,854 terawatt-hours in 2007 and fell to 1,865 terawatt-hours by 2023, a drop of 52 percent.

Wind and solar filled much of that gap. The two sources rose elevenfold between 2007 and 2023, adding 1,723 terawatt-hours of generation, equal to 87 percent of the total decline in coal output.

The carbon intensity of OECD electricity fell alongside generation. Emissions per kilowatt-hour dropped from 479 grams of CO2-equivalent in 2007 to 341 grams in 2023, while total power sector emissions fell 28 percent over the same period.

Solar Leads the Charge

Solar power is now the fastest-growing electricity source in the world. In 2025, global solar generation surged 30 percent year-over-year, meeting 75 percent of all global electricity demand growth that year.

The cost shift has been dramatic. In 2010, solar was roughly 710 percent more expensive than the cheapest fossil fuel option. By 2022, it was 29 percent cheaper. The U.S. Energy Information Administration projects the levelized cost of solar will fall to $25 per megawatt-hour by 2050, compared to an estimated $110 per megawatt-hour for advanced nuclear, which is forecast to hold steady.

As of 2025, 50 countries generate more than 10 percent of their electricity from solar, up from just 15 countries in 2020.

Storage Becomes Essential Infrastructure

The growth of solar has made energy storage a critical part of the power grid. Because solar generates only during daylight hours, storing that energy for use at night has become a core challenge for grid operators.

Battery costs have collapsed. Lithium-ion battery pack prices fell to a record $108 per kilowatt-hour in 2025, down from roughly $1,000 per kilowatt-hour a decade ago, an 89 percent reduction. For stationary storage, prices dropped even further to $70 per kilowatt-hour, a 45 percent decrease from 2024 alone.

Global energy storage deployments reached 275.3 gigawatt-hours in 2025, a 61 percent increase from the prior year. Analysts at BloombergNEF project annual installations will exceed 100 gigawatts in 2026 for the first time and surpass 200 gigawatts within the decade.

Nuclear Holds a Different but Relevant Position

While solar and storage dominate investment headlines, nuclear energy continues to provide something renewables currently cannot: consistent, around-the-clock generation.

Nuclear plants operate at a global average capacity factor of 83 percent, compared to 35 percent for wind and 25 percent for solar. In the United States alone, nuclear generates nearly 775 billion kilowatt-hours annually, accounting for nearly half of the country’s emissions-free electricity.

Nuclear power also carries a carbon footprint comparable to wind across its full lifecycle, and roughly one-third that of solar. France, which generates over 70 percent of its electricity from nuclear, has power sector emissions one-sixth of the European average.

However, cost and construction timelines continue to limit expansion. The UK’s Hinkley Point C project, originally budgeted at £16 billion, has escalated to £34 billion and is not expected online before 2030. Smaller modular reactor designs are under development and could offer faster, cheaper deployment, but no commercial units are yet operating at scale.

Record Investment Backs the Shift

Money is moving in one direction. Global clean energy investment hit a record $2.3 trillion in 2025, up 8 percent from 2024. For the second consecutive year, clean energy spending exceeded fossil fuel investment, with the gap widening to $102 billion.

Fossil fuel supply investment fell by $9 billion year-on-year in 2025, the first such decline since 2020.

The European Union posted the largest regional growth, up 18 percent to $455 billion. U.S. investment rose 3.5 percent to $378 billion despite federal policy shifts away from clean energy support, suggesting the economics of renewables are now largely self-sustaining.

Sources

• OECD Fossil Fuel Electricity Structural Decline Analysis via @kimmonismus
• BloombergNEF Global Energy Storage and Renewable Investment Projections
• U.S. Energy Information Administration Levelized Cost of Electricity Report