In the first quarter of 2025, solar and wind energy accounted for nearly 98% of the newly added electricity to the US power grid, and were the only source of new electricity added in March. The "Sunshine Day" campaign reviewed data from the Federal Energy Regulatory Commission (FERC) and found that March 2025 is the 19th consecutive month in which solar energy has become the largest source of new electricity generation.

The Federal Energy Regulatory Commission (FERC) stated in its latest monthly "Energy Infrastructure Update" report that a total of 31 solar power plants were put into operation in March, with a total installed capacity of 446 megawatts, and another wind power plant - the 223.9 megawatt Shamrock Wind and Energy Storage Project located in Crockett County, Texas - was put into operation. These projects together account for 100% of the newly added power generation capacity for the month.

In the first three months of this year, the total capacity of solar and wind energy (7076 megawatts) accounted for 97.8% of the newly added capacity, while natural gas (147 megawatts) only accounted for 2.0%, and the remaining 0.2% came from oil (11 megawatts).

Solar energy accounted for two-thirds (66.6%) of the newly installed electricity capacity in March. In the first quarter, solar energy accounted for 72.3% of the newly installed capacity. From September 2023 to March 2025, solar energy has been the largest source of monthly new installed power generation capacity for 19 consecutive months.

New wind power accounted for the remaining one-third (33.4%) of the newly installed capacity in March, and more than a quarter (25.5%) of the newly installed capacity in this quarter.

At present, the installed capacity of solar energy (10.7%) and wind energy (11.8%) has exceeded one tenth of the total installed capacity in the country. The two together account for nearly a quarter (22.5%) of the total installed capacity of public utility scale power generation in China.

In addition, about 30% of the solar power generation capacity in the United States exists in the form of small (rooftop) systems, which is not reflected in the data from the Federal Energy Regulatory Commission. If these newly added solar power generation capacities are taken into account, solar and wind power will account for over a quarter of the total electricity generation in the United States.

Combined with hydropower (7.7%), biomass energy (1.1%), and geothermal energy (0.3%), renewable energy currently accounts for 31.5% of the total utility scale power generation capacity in the United States. If small-scale solar power generation is included, renewable energy currently accounts for about one-third of the total electricity generation capacity in the United States.

By comparison, a year ago, renewable energy accounted for 29.4% of the total installed capacity of public utilities, including solar energy (8.3%) and wind energy (11.8%). Five years ago, this proportion was 22.7%, with solar energy accounting for 3.8% and wind energy accounting for 9.0%. Ten years ago, this proportion was 16.9%, with wind energy accounting for 5.7% and solar energy accounting for 1.0%. Therefore, in the past decade, the proportion of wind energy in US electricity generation has more than doubled, while solar energy has grown more than tenfold.