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.

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