Diablo Canyon is a nuclear power facility with 2,323 MW of EIA-reported nameplate capacity in San Luis Obispo County, California, registered as EIA Plant ID 6099. Pacific Gas & Electric Co. is the registered plant entity or operator. The plant's generating configuration is nuclear facility with two Westinghouse pressurized-water reactor (PWR) units. Commercial operation began on May 7, 1985.
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
Pacific Gas & Electric Co. · San Luis Obispo County · CAISO
Diablo Canyon is currently operating; a closure or retirement is listed for June 2016.
500 kV · Pacific Gas and Electric Company (PG&E)
Best-supported operating milestone.
Nuclear
Diablo Canyon is currently operating; a closure or retirement is listed for June 2016.
Diablo Canyon is currently operating; a closure or retirement is listed for June 2016.
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 1,159 MW 1,122 MW summer | Nuclear Nuclear · ST | May 1985 Retirement: Nov 2024 | Operating |
| 2 | 1,164 MW 1,118 MW summer | Nuclear Nuclear · ST | Mar 1986 Retirement: Aug 2025 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
EIA-860 lists generator 1 with this operating date.
500 kV · Pacific Gas and Electric Company (PG&E)
CAISO
CAISO · San Luis Obispo County
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Diablo CanyonCurrent | 2,323 MW | CA | |
| Helms Pumped Storage | 1,053 MW | CA | |
| Colusa Generating Station | 712.4 MW | CA | |
| Gateway Generating Station | 619.7 MW | CA | |
| James B Black | 168.6 MW | CA | |
| Humboldt Bay | 167 MW | CA | |
| Poe | 142.8 MW | CA | |
| Pit 5 | 141.6 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioUnit 1 began commercial operation on May 7, 1985.
EIA-860 lists generator 2 with this operating date.
Unit 2 began commercial operation on March 13, 1986.
The NRC issued Amendment No. 143 approving PG&E’s Unit 1 reactor-core thermal-power uprate application; the application had been submitted on December 31, 1999.
PG&E and PG&E Corporation filed a Chapter 11 reorganization plan under which operating authority would be transferred to Electric Generation LLC and ownership of the two-unit generating asset would be assigned to its wholly owned subsidiary, Diablo Canyon LLC.
The NRC published notice of consideration of the proposed transfer of Diablo Canyon’s facility operating licenses from PG&E to Electric Generation LLC and Diablo Canyon LLC.
PG&E announced plans to close Diablo Canyon when the then-current NRC licenses expired in 2024 and 2025.
EIA-860 lists a planned retirement for generator 1.
EIA-860 lists a planned retirement for generator 2.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Diablo Canyon has a reported capacity of 2,323 MW. Source: EIA Form 860.
Diablo Canyon is a nuclear facility in San Luis Obispo County, CA, participating in the CAISO market.
Diablo Canyon is in San Luis Obispo County, CA, inside the CAISO balancing area.
Diablo Canyon is operated by Pacific Gas & Electric Co. according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Diablo Canyon reported 18,376.8 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
Diablo Canyon interconnects at Diablo Canyon substation, on the Pacific Gas and Electric Company (PG&E) system.
By capacity, Diablo Canyon ranks #17 of 54 operating plants of the same technology nationally. It ranks #1 of 1 in CA.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
