⚛️ EnergyIndex Nuclear

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

The steadiest source on the grid — tracked as fleet output, uprates and restarts change the number.

Get the monthly Nuclear brief
EnergyIndex Nuclear
100.24
Trailing-12-month generation vs. calendar 2020 = 100
Nuclear share of U.S. generation
15.69%
July 2026
Generation, July 2026
71,172 GWh
Utility-scale, all sectors
Trailing 12 months vs. prior year
+1.9%
791,778 GWh over the last 12 months
Monthly generation, GWh — August 2023 to July 2026. Source: EIA.

What this index measures

The EnergyIndex Nuclear series tracks U.S. nuclear generation. The fleet runs around the clock, so this series moves on refueling outages, uprates, restarts and new units rather than weather. It is the baseline against which data-center power demand is now being measured.

Who uses it

  • Data-center and industrial buyers seeking firm, carbon-free power
  • Policy teams following restarts and new builds
  • Investors tracking the nuclear supply chain

Methodology

  1. Source. U.S. Energy Information Administration, Electric Power Operational Data, monthly net generation, fuel type NUC (nuclear (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 Nuclear brief

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