In May 2026, solar energy in the United States generated more electricity than coal for the first time in history. Solar accounted for 12.8 percent of American electricity generation, while coal fell to 12.2 percent. After decades of coal dominance, this shift has become reality.
Five Years That Reversed the Market
The scale of the transformation becomes clear in comparison. In May 2021, coal still provided 19.7 percent of US electricity, while solar contributed only 5.4 percent. Five years later, solar more than doubled its share while coal lost more than seven percentage points.
In May 2026, solar installations in the United States generated a record 45.5 terawatts, 17 percent more than May 2025. Coal fell to 43.4 terawatts, down 11 percent from May 2025. This data comes from an analysis by Ember, an independent energy research institute, based on official figures from the US Energy Information Administration (EIA).
May is traditionally a strong month for solar as daylight hours increase before summer cooling demands boost overall electricity consumption. However, the structural shift is larger than seasonal effects alone. Solar is now the third-largest electricity source in the United States, behind natural gas and nuclear power. As early as March 2026, renewable energy sources collectively surpassed natural gas as the largest electricity source in a monthly comparison for the first time in US history.
Why Solar Has Overtaken Coal
Three factors explain the transformation: dramatically falling costs, increasing installed capacity, and declining economic viability of coal plants.
Solar electricity has become roughly 90 percent cheaper since 2010. The International Renewable Energy Agency (IRENA) estimates average solar cost per project at USD 0.043 per kilowatt-hour in 2024. In most US markets, new solar power is now cheaper than electricity from existing coal plants, which face comparatively high operating and maintenance costs.
Simultaneously, few new coal plants were built. Many operators shut down existing facilities early because they could no longer compete economically against cheaper gas and solar alternatives. The effect is a structural decline, not a temporary fluctuation.
One important caveat: The International Energy Agency recently cut its US solar forecast for 2030 by nearly 50 percent. The primary reason is the elimination of the Residential Solar Tax Credit at the start of 2026, which had provided significant support for rooftop installations on homes. Political conditions can substantially slow deployment pace.
Global Context: Europe Led This Transition Earlier
The United States is not the first country to reach this milestone. In the European Union, wind and solar already generated more electricity than all fossil fuels combined in 2025, according to Ember's European Electricity Review 2026. Globally, renewable energy sources generated more electricity than coal in 2025 for the first time since 1919. While the global electricity network was roughly 300 times smaller then, today's milestone occurs at a vastly larger scale. Ember and the International Energy Agency view it as a structural turning point, not a statistical anomaly.
India also surpassed the United States in 2026 as the world's second-largest solar market. In the first quarter of 2026, India installed 14.4 gigawatts of new solar capacity. The United States lags in grid expansion and residential systems due to the lost tax credits, but continues to lead in utility-scale solar installations.
At Current Pace: Could Solar Surpass Nuclear by 2029?
If solar in the United States maintains its historical growth trajectory, solar electricity could overtake nuclear power as the second-largest source by 2028 or 2029. Nuclear power plants provided roughly 19 percent of US electricity in May 2026, compared to solar's new record of 12.8 percent. The gap of approximately seven percentage points matches the distance solar closed on coal in five years.
This projection carries the caveat of political uncertainty. Without the eliminated tax credits for rooftop systems, residential solar growth will slow. Large-scale solar projects supported by other programs and declining module prices will continue advancing.
What is certain: In May 2026, solar generated more electricity than coal in the United States. In absolute numbers and without exception.