Diablo Canyon
Nuclear power plant · San Luis Obispo County, California
Details
- Primary fuel
- Nuclear
- Technology
- Nuclear
- Operator
- Pacific Gas & Electric Co.
- County
- San Luis Obispo County
- Generating units
- 2
- Share of state capacity
- 2.15%
- Rank among nuclear plants in California
- #1 of 1
- EIA plant code
- 6099
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 2 | Nuclear | 1,164 MW | 1,118 MW | 1986 | Operating |
| 1 | Nuclear | 1,159 MW | 1,122 MW | 1985 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in California
| Dynegy Moss Landing Power Plant Hybrid | Battery storage | 1,848 MW |
| Haynes | Natural gas | 1,739 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 2,323 MW solar plant and a 2,323 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All California power plants · What California actually generates