In May, solar supplied 12.8% of US electricity versus coal's 12.2%, the first monthly crossover on record. Analysts say AI, reshored manufacturing, and electrification, not federal mood, are widening the gap.
For the first time on a monthly basis, solar supplied more US electricity than coal. In May 2026, solar generated 12.8% of the country's power, edging past coal's 12.2%, according to data released Wednesday by the global energy thinktank Ember and a joint report from the Solar Energy Industries Association and Wood Mackenzie.
The milestone lands in the middle of an aggressive federal push to prop up coal and slow renewables. The Trump administration has used federal policy levers to favor coal and reduce support for clean energy, a posture that has not, so far, shown up in the generation mix.
"The numbers tell the real story," said Nicolas Fulghum, senior energy and data analyst at Ember. Solar's monthly share has climbed steadily over the past several years while coal has settled into a long, structural decline. Coal's 12.2% May share is its fourth-lowest monthly reading on record, and its April share set an all-time low before ticking back up modestly in May. The crossover is solar rising into a falling floor, not a one-month fluke.
What is keeping solar on top of coal is not federal mood. The structural demand drivers — AI data center buildouts, reshored manufacturing, electrified transport, and home heating — are pulling from both parties' constituencies and now show up as actual megawatt-hours on the grid. Fulghum's framing, as reported by The Guardian, is that those drivers are widening the lead faster than federal policy can narrow it.
Solar is now the third-largest source of US electricity, behind natural gas and nuclear, and ahead of coal. Ember expects more monthly overtakes before an annual crossover, something the analyst says is "a few years" out.
The second source layer matters. The SEIA and Wood Mackenzie report, released alongside Ember's data, provides a US industry- and analytics-side confirmation that the milestone is not a single researcher's reading. Together, the data and the policy backdrop make the moment legible: the math is moving in one direction, and federal headwinds are not reversing it.