Solar has led all US generating capacity additions for 25 consecutive months, according to the SUN DAY Campaign’s review of new Federal Energy Regulatory Commission data.
Solar provided 98% of new capacity in September, the group said.
FERC’s latest update showed 48 solar units totalling 2014MW were placed into service in September, added the review.
Year-to-date, utility-scale solar has added 21257MW across 567 units, representing more than 75% of all new US generating capacity.
Total utility-scale solar capacity increased from 91.82GW to 158.43GW between September 2023 and September 2025.
Wind added 3724MW in the first nine months of 2025, exceeding the 3161MW from natural gas.
Renewables accounted for over 88.5% of new capacity year-to-date, including small contributions from hydropower and biomass.
Utility-scale solar now makes up 11.78% of US installed capacity, virtually level with wind at 11.80%.
Wind and solar together account for 23.58% of total US utility-scale generating capacity.
FERC’s “high probability” forecast shows solar could add 90614MW over the next three years, compared to 23093MW for wind.
“In an effort to deny reality, the Trump Administration has just announced a renaming of the National Renewable Energy Laboratory (NREL) in which it has removed the word ‘renewable’,” said SUN DAY Campaign executive director Ken Bossong. “However, FERC’s latest data show that no amount of rhetorical manipulation can change the fact that solar, wind, and other renewables continue on the path to eventual domination of the energy market.”