In its latest monthly “Energy Infrastructure Update” report (with data through June 30, 2025), FERC says 63 “units” of solar totaling 2,439 megawatts (MW) were placed into service in June, accounting for over 81.5% of all new generating capacity added during the month.
The new facilities include six solar farms with capacities of 199-MW or more: the 417.7-MW Ash Creek Solar Project and the 206.1-MW Mercury Solar & Storage Project both in Hill County, TX; the 300-MW Box Canyon Solar Project in Pinal County, AZ; the 250-MW Morris Solar Project in Adair County, MO; the 200.0-MW Big Star Solar & Storage Project in Bastrop County, TX; and the 199.0-MW Speedway Solar Project in Shelby County, IN.
The 14,567-MW of utility-scale (i.e., >1-MW) solar added during the first six months of 2025 was almost three-quarters (74.9%) of the total new capacity placed into service by all sources.
Solar has now been the largest source of new generating capacity added each month for twenty-two consecutive months: September 2023 – June 2025. During that period, total utility-scale solar capacity grew from 91.82 gigawatts (GW) to 151.73-GW. No other energy source added anything close to that amount of new capacity. Wind, for example, expanded by 10.53-GW while natural gas increased by just 2.73-GW.
Solar, wind and biomass were over 91% of new capacity added in the first half of 2025:
Between January and June, new wind has provided 3,139-MW of capacity additions – almost double the new capacity provided by natural gas (1,727-MW). Wind thus accounted for 16.1% of all new capacity added during the first six months of 2025. In June alone, the 144.0-MW Crossover Wind Project in Cross County, AR came on-line along with the 58.8-MW Moscow Wind Power Project in Somerset County, ME.
For the first half of 2025, the combination of solar and wind (plus 3-MW of biomass) was 91.04% of new capacity while natural gas provided just 8.88%; the balance came from oil (14-MW).
Solar + wind are almost a quarter of U.S. utility-scale generating capacity; all renewables combined are nearly a third:
Utility-scale solar’s share of total installed capacity of (11.34%) is now almost equal to that of wind (11.83%). Taken together, they constitute nearly one-fourth (23.17%) of the U.S.’s total available installed utility-scale generating capacity.