☀️ EnergyIndex Solar

Solar on the U.S. grid, by the numbers.

How much of America's electricity comes from the sun — measured monthly, published openly.

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EnergyIndex Solar
375.22
Trailing-12-month generation vs. calendar 2020 = 100
Solar share of U.S. generation
9.13%
July 2026
Generation, July 2026
41,412 GWh
Utility-scale, all sectors
Trailing 12 months vs. prior year
+24.8%
334,696 GWh over the last 12 months
Monthly generation, GWh — August 2023 to July 2026. Source: EIA.

What this index measures

The EnergyIndex Solar series tracks utility-scale solar generation in the United States as reported by the U.S. Energy Information Administration. It answers one question a homeowner, an installer or an analyst all care about: is solar's share of the grid growing, and how fast?

Who uses it

  • Homeowners weighing a solar quote (see SolarCenter.com)
  • Installers and developers sizing demand by state
  • Analysts and journalists who need a clean, cited number

Methodology

  1. Source. U.S. Energy Information Administration, Electric Power Operational Data, monthly net generation, fuel type SUN (solar (utility-scale, all sectors)), location US, sector 99 (all sectors). Units: thousand megawatt-hours, shown here as GWh.
  2. Share. Source generation divided by all-fuels generation (ALL) for the same month.
  3. Index level. Trailing-12-month generation divided by total generation in calendar 2020, times 100. 2020 = 100. A level of 150 means the last twelve months produced one-and-a-half times what 2020 did.
  4. Revisions. EIA revises recent months; we re-pull every six hours and restate without notice. The most recent month is preliminary.
  5. What this is not. Not a price, not a security, not investment advice. Nothing on this site is for sale or trade.

Latest data month: July 2026. Retrieved from EIA API v2.

Download this series as JSON · Full methodology

Monthly Solar brief

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Other source indices

🌬️ WindAmerica's wind generation, month by month, from the official federal series.⚛️ NuclearThe steadiest source on the grid — tracked as fleet output, uprates and restarts change the number.💧 HydroConventional hydroelectric generation — the original renewable, and the one most tied to snowpack and rainfall.🌋 GeothermalSmall today, firm and always-on — the series to watch as enhanced geothermal moves from pilots to plants.🔋 StoragePumped-storage hydro today; battery fleet capacity as the series expands.🔆 FusionNo fusion plant feeds the grid yet. This page tracks how close we are — with sources for every claim.