U.S. electricity is generated from a mix of fossil fuels, nuclear power, and renewable energy. The mix changes year to year based on fuel prices, weather, power demand, and how much new wind/solar capacity comes online.
If you’re looking for a clear, by-the-numbers view, the U.S. Energy Information Administration (EIA) publishes official generation totals and shares—usually split into utility-scale generation (power plants ≥ 1 megawatt) and small-scale solar (mostly rooftop systems < 1 megawatt).
Below is a practical overview of U.S. electricity generation by energy source, using the most recent EIA snapshots available as of early 2026.
U.S. electricity generation by major source (latest actual year: 2024)
EIA’s U.S. energy facts page summarizes 2024 electricity generation at about 4.30 trillion kilowatthours (kWh) and provides shares by major source.
2024 U.S. electricity generation mix
| Energy source (major categories) | Share of U.S. generation (2024) |
|---|---|
| Natural gas | 43% |
| Renewables (total) | 23% |
| Nuclear | 18% |
| Coal | 15% |
| Petroleum | 0.4% |
| Other gases & miscellaneous sources | 0.2% |
How to read this: In 2024, natural gas remained the largest single source, while renewables (combined) exceeded coal’s share, and nuclear continued to supply a large, steady block of generation.
Detailed breakdown example (EIA’s utility-scale table: 2023)
For a more granular breakdown (wind vs hydro vs solar, etc.), EIA’s FAQ provides a detailed utility-scale table for 2023. In that year, the U.S. generated 4,178 billion kWh at utility-scale facilities.
2023 U.S. utility-scale generation by source
| Source (utility-scale) | Generation (billion kWh) | Share of total |
|---|---|---|
| Natural gas | 1,802 | 43.1% |
| Coal | 675 | 16.2% |
| Nuclear | 775 | 18.6% |
| Wind | 425 | 10.2% |
| Hydropower | 240 | 5.7% |
| Solar (total) | 165 | 3.9% |
| Biomass (total) | 47 | 1.1% |
| Geothermal | 16 | 0.4% |
| Petroleum (total) | 16 | 0.4% |
| Other gases | 11 | 0.3% |
Small-scale solar note: EIA estimates an additional 73.62 billion kWh of generation from small-scale solar PV in 2023 (mostly rooftop systems).
What about 2025 and 2026?
EIA reported that U.S. electricity net generation reached a record in 2025 (4.43 TWh) based on its Electricity Data Browser.
Separately, EIA’s Short-Term Energy Outlook (STEO)-based analysis summarizes 2025 electric power sector generation and provides key mix signals:
- Total electric power sector generation in 2025: about 4,260 billion kWh
- Natural gas share in 2025: about 40%
- Coal generation rose in 2025; coal share cited around 17% (and 2025 coal generation ~731 BkWh)
- Dispatchable generation (natural gas + coal + nuclear) was 75% of total generation in 2025 (implying nuclear around the high-teens share, given the gas+coal shares).
- Wind + solar combined share: about 18% in 2025, rising in the forecast through 2027
Why there are different totals for 2025: Some EIA publications report net generation across all sectors, while others focus on the electric power sector and/or different datasets (Monthly Energy Review vs Electricity Data Browser). The mix story is consistent—more total generation, with wind and solar rising, and gas still the largest source—but the exact totals can differ by definition and dataset.
What counts as renewable electricity generation?
In EIA reporting, renewables typically include:
- Wind
- Hydropower
- Solar (utility-scale and small-scale are often reported separately)
- Biomass
- Geothermal
EIA notes these as part of the main categories used to describe U.S. generation sources.
Why the U.S. generation mix changes year to year
Even without big policy changes, the mix can shift because of:
- Natural gas vs coal economics: Gas and coal compete heavily in dispatch decisions. EIA notes coal generation increased in 2025 partly because of colder weather and relatively higher natural gas prices.
- Weather-driven renewables: Hydropower depends on water availability; wind output varies by region and year.
- Capacity additions (especially solar): EIA expects utility-scale solar to be a major driver of growth through 2027, with large amounts of new capacity scheduled.
- Rising electricity demand: EIA links recent growth to higher demand, including commercial drivers like data centers.
Frequently asked questions
Is most U.S. electricity still generated from fossil fuels?
Yes. In 2023 utility-scale data, about 60% of generation came from fossil fuels (natural gas, coal, petroleum, and other gases). In 2024 major-source data, natural gas and coal together accounted for 58% (43% gas + 15% coal), with small additional fossil contributions from petroleum and other gases/sources.
What is the biggest source of electricity generation in the U.S.?
Natural gas is the largest single source in the recent EIA snapshots (43% in 2024).
How important is solar in U.S. electricity generation?
In EIA’s detailed 2023 utility-scale table, utility-scale solar was about 3.9% (165 billion kWh), plus additional small-scale solar (73.62 billion kWh). EIA’s STEO-based analysis also expects solar to be the fastest-growing source in the near term.
Conclusion
U.S. electricity generation by energy source can be summarized simply:
- Natural gas is the largest source.
- Renewables (wind, hydro, solar, biomass, geothermal) are a major—and growing—share.
- Nuclear remains a large, steady contributor.
- Coal is smaller than gas and renewables combined, and its share continues to fluctuate with prices and weather.
For a quick current snapshot, EIA’s 2024 summary shows: 43% natural gas, 23% renewables, 18% nuclear, 15% coal.
For detailed subcategories (wind vs hydro vs solar), EIA’s 2023 table is the clearest breakdown.