Diablo Canyon
San Luis Obispo County, California · EIA plant ID 6099 · Operator: Pacific Gas & Electric Co
Nameplate2,323MWSummer 2,240 MW
Generators2in service
Net generation18,595GWh12 mo to Aug 2026
Capacity factor95%nuclear units, summer MW
Heat rate—thermal plants only
First online1985
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), nuclear units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 18,077.7 | 94.9% | — |
| 2002 | 16,304.2 | 85.6% | — |
| 2003 | 17,285 | 90.8% | — |
| 2004 | 15,230.4 | 79.8% | — |
| 2005 | 17,755.3 | 93.2% | — |
| 2006 | 18,391 | 93.7% | — |
| 2007 | 18,588.5 | 94.7% | — |
| 2008 | 17,090.5 | 86.9% | — |
| 2009 | 16,264.9 | 82.9% | — |
| 2010 | 18,429.9 | 93.9% | — |
| 2011 | 18,566.1 | 94.6% | — |
| 2012 | 17,712.5 | 90.0% | — |
| 2013 | 18,012.4 | 91.8% | — |
| 2014 | 16,986 | 86.6% | — |
| 2015 | 18,505.4 | 94.3% | — |
| 2016 | 18,907.6 | 96.1% | — |
| 2017 | 17,901.1 | 91.2% | — |
| 2018 | 18,213.5 | 92.8% | — |
| 2019 | 16,165.4 | 82.4% | — |
| 2020 | 16,258.7 | 82.6% | — |
| 2021 | 16,477.4 | 84.0% | — |
| 2022 | 17,593.3 | 89.7% | — |
| 2023 | 17,718.4 | 90.3% | — |
| 2024 | 18,378.8 | 93.4% | — |
| 2025 | 17,558.4 | 89.5% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Nuclear | ST | 1,159 | 1,122 | May 1985 | Operating | — | coming soon |
| 2 | Nuclear | ST | 1,164 | 1,118 | Mar 1986 | Operating | — | coming soon |
Owner / operator
Operator: Pacific Gas & Electric Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Pacific Gas & Electric Co | 100.0% | 2,323 MW |
Nearby plants
Within 80 km.
| Camp San Luis Obispo | 1 MW | 16.6 km |
| Stenner Creek Solar | 5 MW | 19.2 km |
| CA-DGS-California Men's Colony | 2 MW | 19.4 km |
| Thomas M Knott Cogen Facility | 1 MW | 21.8 km |
| Cold Canyon 1 | 2 MW | 23.4 km |
| Whale Rock Pumped Storage Hydro Project | — | 27 km |