The latest "Electricity Monthly Report" released by the US Energy Information Administration (EIA) shows that solar power generation in September 2025 increased by 29.9% compared to a year ago and provided 9.7% of the country's electricity output in that month, compared to 7.6% in 2024.

In the first nine months of 2025, large-scale solar power generation increased by 35.8% compared to the same period in 2024, while small-scale solar power generation increased by 11.2%. The combination of large and small solar power generation has increased by almost one-third (29.0%) and generated slightly over 9% of the total electricity generation in the United States from January to September (large: 6.85%; small: 2.16%), up from 7.2% a year ago. According to the SUN DAY Campaign's review of the data, the situation is as follows.

For the third consecutive month, the large-scale solar power generation exceeded the national wind power generation by 4% in July, 15% in August, and 9% in September. Including residential systems, solar energy has consistently surpassed wind energy for five months and increased by over 40% in September.

Similarly, so far this year (YTD), solar power generation has easily surpassed the electricity generation of hydropower stations nationwide (accounting for 5.5% of the total electricity generation), and has exceeded nearly 65%. In September alone, solar power generation exceeded twice the power generation of hydropower stations nationwide. In fact, in September and so far this year, solar power generation has exceeded the total power generation of hydropower, biomass, and geothermal.

In the first nine months of 2025, wind power combined with large and small solar power provided 18.8% of the total electricity generation in the United States, compared to 17.1% in the first three quarters of 2024. In addition, the combination of wind and solar energy provided 15.1% more electricity than coal and 9.8% more electricity than nuclear power plants nationwide in the first nine months of this year. In fact, with the expansion of solar and wind energy, nuclear power generation has decreased by 0.1%.

All renewable energy sources generated 8.7% more electricity between January and September compared to last year, and provided 25.6% of the total electricity generation in the United States compared to last year, instead of 24.2%. Renewable energy generation is now second only to natural gas, and natural gas power generation has actually decreased by 3.8% in the first nine months of 2025.

The Trump administration's efforts to revive nuclear energy and fossil fuels have not been successful, "said Ken Bossong, executive director of the Sun Day Movement. The capacity of solar energy, wind energy, and battery storage continues to increase at a significant rate, surpassing natural gas, coal, and nuclear energy, and the gap is constantly widening