Solar power overtook coal in the U.S. electricity mix for the first full month on record in May, marking a pivotal shift in the nation's energy landscape. According to energy think tank Ember, solar supplied 12.8% of the country's electricity, while coal's share slumped to 12.2% — its fourth-lowest monthly level ever.
The milestone was driven by a surge in solar generation, which hit an all-time high of 45.5 terawatt-hours (TWh) in May, up 17% from a year earlier. Coal's decline reflects broader structural trends: plant retirements, cheap natural gas, and the rapid expansion of renewable capacity. Solar now provides more than double the share of electricity it did five years ago.
The achievement comes despite headwinds from federal policy, including reduced grants and stop-work orders on renewable projects under the current administration. CleanTechnica reports that the Trump administration has actively sought to curb renewables, yet solar's growth has persisted, underpinned by falling costs and state-level mandates.
Geopolitically, the shift reduces the U.S. power sector's reliance on coal, a fuel tied to significant carbon emissions and mining-related controversies. It also positions solar as a growing counterweight to fossil fuels in the domestic energy mix, though natural gas remains the largest source of electricity.
The transition is not without caveats. Solar's generation remains intermittent, and coal still provides dispatchable baseload power during peak demand. Critics argue that without grid-scale storage or policy support, solar's gains could plateau, especially if federal incentives continue to erode.