Solar and wind accounted for 90% of new US electrical generating capacity added in the first seven months of 2025, according to data just released by the Federal Energy Regulatory Commission (FERC). In July, solar alone provided 96% of new capacity, making it the 23rd consecutive month solar has held the lead among all energy sources.

Solar’s new generating capacity in July and YTD

In its latest monthly “Energy Infrastructure Update” report (with data through July 31, 2025), which was reviewed by the SUN DAY Campaign, FERC says 46 “units” of solar totaling 1,181 megawatts (MW) were placed into service in July, accounting for over 96.4% of all new generating capacity added during the month.

The 434 units of utility-scale (>1 MW) solar added during the first seven months of 2025 total 16,050 MW and were 74.4% 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 23 consecutive months from September 2023 to July 2025. During that period, total utility-scale solar capacity grew from 91.82 gigawatts (GW) to 153.09 GW. No other energy source added anything close to that amount of new capacity. Wind, for example, expanded by 10.68 GW, while natural gas increased by just 3.74 GW.

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Renewables were 90% of new capacity added YTD

Between January and July, new wind provided 3,288 MW of capacity additions – significantly more than the new capacity provided by natural gas (2,207 MW). Wind thus accounted for 15.2% of all new capacity added during the first seven months of 2025.

For the same period, the combination of solar and wind (plus 4 MW of hydropower and 3 MW of biomass) was 89.6% of new capacity, while natural gas provided just 10.2%; the balance came from coal (18 MW), oil (17 MW), and waste heat (17 MW).

Solar + wind are 23.23% of US utility-scale generating capacity

Utility-scale solar’s share of total installed capacity (11.42%) is now almost equal to that of wind (11.81%). Taken together, they constitute 23.23% of the US’s total available installed utility-scale generating capacity.

Moreover, at least 25-30% of US solar capacity is in the form of small-scale (e.g., rooftop) systems that are not reflected in FERC’s data. Including that additional solar capacity would bring the share provided by solar + wind to more than a quarter of the US total.

With the inclusion of hydropower (7.61%), biomass (1.07%), and geothermal (0.31%), renewables currently claim a 32.22% share of total US utility-scale generating capacity. If small-scale solar capacity is included, renewables are now more than one-third of total US generating capacity.

Solar still on track to become No. 2 source of US generating capacity

FERC reports that net “high probability” additions of solar between August 2025 and July 2028 total 92,631 MW – an amount more than four times the forecast net “high probability” additions for wind (22,528 MW), the second fastest-growing resource.

FERC also foresees net growth for hydropower (579 MW) and geothermal (92 MW) but a decrease of 131 MW in biomass capacity.

Taken together, the net new “high probability” capacity additions by all renewable energy sources over the next three years – the bulk of the Trump Administration’s remaining time in office – would total 115,120 MW.  

There are now 35 MW of new nuclear capacity in FERC’s three-year forecast, while coal and oil are projected to contract by 25,017 MW and 1,576 MW, respectively. Natural gas capacity would expand by just 8,276 MW.

Should FERC’s three-year forecast materialize, by mid-summer 2028, utility-scale solar would account for more than 17% of installed U.S. generating capacity – more than any other source besides natural gas (40%). Further, the capacity of the mix of all utility-scale renewable energy sources would exceed 38%. Inclusion of small-scale solar systems would push renewables ahead of natural gas.

“With one month of Trump’s ‘One Big Beautiful Bill’ now under our belts, renewables continue to dominate capacity additions,” noted the SUN DAY Campaign’s executive director, Ken Bossong. “And solar seems poised to hold its lead in the months and years to come.” 

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