US Energy Information Administration (EIA) data released on November 25 and reviewed by the SUN DAY Campaign reveal that, during the first nine months of 2025 and for the past year, solar and battery storage have dominated growth among competing energy sources, while fossil fuels and nuclear power have stagnated.

EIA’s latest “Electric Power Monthly” report (with data through September 30, 2025), once again confirms that solar is the fastest-growing source of electricity in the US.

In September alone, electrical generation by utility-scale solar (>1 megawatt (MW)) ballooned by well over 36.1% compared to September 2024, while “estimated” small-scale (e.g., rooftop) solar PV increased by 12.7%. Combined, they grew by 29.9% and provided 9.7% of US electrical output during the month, up from 7.6% a year ago.

Moreover, generation from utility-scale solar thermal and photovoltaic systems expanded by 35.8%, while that from small-scale systems rose by 11.2% during the first nine months of 2025 compared to the same period in 2024. The combination of utility-scale and small-scale solar increased by 29.0% and produced a bit over 9.0% (utility-scale: 6.85%; small-scale: 2.16%) of total US electrical generation for January-September, up from 7.2% a year earlier.

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And for the third consecutive month, utility-scale solar generated more electricity than US wind farms: by 4% in July, 15% in August, and 9% in September. Including small-scale systems, solar has outproduced wind for five consecutive months and by over 40% in September.

Wind turbines across the US produced 9.8% of US electricity in the first nine months of 2025 – an increase of 1.3% compared to the same period a year earlier and 79% more than that produced by US hydropower plants.

During the first nine months of 2025, electrical generation from wind plus utility-scale and small-scale solar provided 18.8% of the US total, up from 17.1% during the first three quarters of 2024.

Wind and solar combined provided 15.1% more electricity than did coal during the first nine months of this year, and 9.8% more than the US’s nuclear power plants. In fact, as solar and wind expanded, nuclear-generated electricity dropped by 0.1%.

The mix of all renewables (wind, solar, hydropower, biomass, and geothermal) produced 8.7% more electricity in January-September than they did a year ago, providing 25.6% of total US electricity production compared to 24.2% 12 months earlier.

Renewables’ share of electrical generation is now second to only that of natural gas, which saw a 3.8% drop in electrical output during the first nine months of 2025.  

Between October 1, 2024, and September 30, 2025, utility-scale solar capacity grew by 31,619.5 MW, while an additional 5,923.5 MW was provided by small-scale solar. EIA foresees continued strong solar growth, with an additional 35,210.9 MW of utility–scale solar capacity being added in the next 12 months.

Strong growth was also experienced by battery storage, which grew by 59.4% during the past year, adding 13,808.9 MW of new capacity. EIA also notes that planned battery capacity additions over the next year total 22,052.9 MW.

Wind also made a strong showing during the past 12 months, adding 4,843.2 MW, while planned capacity additions over the next year total 9,630.0 MW (onshore) plus 800.0 MW (offshore).

On the other hand, natural gas capacity increased by only 3,417.1 MW and nuclear power added 46.0 MW. Meanwhile, coal capacity plummeted by 3,926.1 MW and petroleum-based capacity fell by an additional 606.6 MW.

Thus, during the past year, renewable energy capacity, including battery storage, small-scale solar, hydropower, geothermal, and biomass, ballooned by 56,019.7 MW while that of all fossil fuels and nuclear power combined actually declined by 1,095.2 MW.

The EIA expects this trend to continue and accelerate over the next 12 months. Utility-scale renewables plus battery storage are projected to increase by 67,806.1 MW (a forecast for small-scale solar is not provided). Meanwhile, natural gas capacity is expected to increase by only 3,835.8 MW, while coal capacity is projected to decrease by 5,857.0 MW, and oil capacity is anticipated to decrease by 5.8 MW. EIA does not project any new growth for nuclear power in the coming year.

SUN DAY Campaign’s executive director Ken Bossong said:

The Trump Administration’s efforts to jump-start nuclear power and fossil fuels are not succeeding. Capacity additions from solar, wind, and battery storage continue to dramatically outpace those from gas, coal, and nuclear, and by growing margins.

Read more: EIA: Solar + storage dominate, fossil fuels stagnate to August 2025

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