Energy guide
US energy sources explained
How America generates electricity and how to read each source in RateWatt's EIA-backed generation data.
Natural gas generates the largest share of US electricity
According to the U.S. Energy Information Administration (EIA Electric Power Monthly, 2025), natural gas supplies 40.4% of US electricity generation, followed by nuclear at 17.5% and a combined 24.6% from wind, solar, and hydro. Coal, once dominant, now supplies 16.5%.
How America makes its power
Natural gas generates the largest share of US electricity, with nuclear and a fast-growing renewable fleet making up most of the rest.
- 40.4%
- natural gas
- 17.5%
- nuclear
- 24.6%
- renewables (wind+solar+hydro)
- 16.5%
- coal
US generation mix, EIA 2025. Wind 10.4% · solar 8.7% · hydro 5.5%.
US electricity generation by source (2025)
Share of total US generation, in percent.
- Natural gas
Natural gas
40
- Nuclear
Nuclear
18
- Coal
Coal
17
- Wind 10
Wind
10
- Solar 9
Solar
9
- Hydro 6
Hydro
6
What this shows Natural gas is the largest listed source in this EIA-backed national generation mix; the chart reports generation shares rather than retail-rate causes.
Natural Gas, The Dominant Fuel
Natural gas is the largest source in the EIA-backed national generation mix shown above. EIA describes natural gas as one of several sources used in U.S. steam and gas turbines. RateWatt reports its generation share; it does not use that share to assign a retail-rate cause to an individual state.
Open the energy sources pages to compare reported state generation shares. For a current bill or rate explanation, use the applicable utility tariff and regulator materials.
Nuclear in the Generation Mix
Nuclear accounts for $17.5% of the national generation mix in the dataset used here. It is a separate generation category in EIA reporting; this guide does not use that share to estimate a state's retail rate or the economics of a particular plant.
Plant costs, licensing, construction schedules, waste management, and grid operations require source-specific evidence. They are outside the annual generation-share data that serves this page.
Coal in the Generation Mix
Coal accounts for $16.5% of the current national generation mix shown here. EIA generation tables can show how that share changes over time, but they do not establish why a particular plant retires, converts, or remains in service.
RateWatt's state pages show reported coal generation shares and annual changes. They do not infer local economic outcomes or retail-rate effects from those shares.
Wind in the Generation Mix
Wind accounts for $10.4% of the national generation mix shown here. Wind turbines convert wind energy into electricity; output varies with the available wind resource.
Capacity, project cost, and operating choices vary by project and grid region. RateWatt uses annual generation shares as descriptive context, not as a ranking of technologies or a retail-rate explanation.
Solar in the Generation Mix
Solar accounts for $8.7% of the national generation mix shown here. Solar photovoltaic systems convert sunlight directly into electricity; the EIA reports utility-scale and small-scale solar separately in some series.
Project cost, timing, storage, and local demand require a source specific to the project or grid region. This annual mix does not determine a household bill or a state's retail-rate ranking.
Hydroelectric Power in the Generation Mix
Hydroelectric power accounts for $5.5% of the national generation mix shown here. Conventional hydropower uses flowing water to spin a turbine connected to a generator.
A state's hydro share is descriptive generation context. It is not evidence that the state has a particular retail rate, bill, or project cost.
Your State's Mix
Every state has a different reported generation mix. RateWatt shows the available breakdown for all 50 states; check your state's page to compare that context with the national mix. A generation mix alone does not determine a retail rate or a household bill.
Frequently Asked Questions
What is the largest source of electricity in the US?
Natural gas generates approximately 40.4% of the US generation recorded in RateWatt's EIA-backed dataset, making it the largest listed source. Nuclear (17.5%), coal (16.5%), wind (10.4%), and solar (8.7%) are also reported separately.
Do generation shares explain a state's retail rate?
No. A generation mix is descriptive context, while a retail electricity rate also reflects utility tariffs, delivery costs, customer mix, taxes, fees, and the measurement period. RateWatt does not infer a state-level retail-rate cause from its generation-share data.
What happens when wind or solar output is lower?
Wind and solar output varies with the resource. Grid operators balance supply and demand using a mix of generation, transmission, storage, and demand-side tools; the mix and operating rules vary by grid region.
Which states have the most renewable generation?
RateWatt's state profiles report shares for the stored 2025 EIA period. Those shares describe electricity generation in the state; they do not by themselves measure a household's electricity price, emissions, or the source of electricity consumed at a specific address.
Sources
This content is for informational purposes only and does not constitute financial advice.
How to use RateWatt with the source boundary intact
Start with how electricity rates are built to understand the difference between a statewide annual benchmark and a utility tariff, then use state-level rate data to compare stored annual averages. The rate-structure guide explains common tariff structures. For state-by-state comparison, the cheapest-states guide and annual-rate guide report where statewide averages sit without assigning a cause. The renewable cost comparison covers industry LCOE estimates separately from RateWatt's EIA-backed data. Neither a generation mix nor an annual statewide average is an individual utility quote.
Drill into the mix
A state’s fuel mix is useful generation context, but it does not by itself explain a retail rate.
- Explore every fuel source and its role on the grid. Energy sources
- See which states lean most on renewables. Most renewable
- Open any state’s profile for its mix and rate. All states
Generation shares are EIA 2025 national figures; each state’s mix differs.
The live generation-mix figures on this page are pulled directly from the EIA database. Broader context and explanatory figures in the guide text come from public EIA and industry reporting, not necessarily this portal's live database. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2025.