How big is Diablo Canyon?

Diablo Canyon has a reported capacity of 2,323 MW. Source: EIA Form 860.

What kind of plant is Diablo Canyon?

Diablo Canyon is a nuclear facility in San Luis Obispo County, CA, participating in the CAISO market.

Where is Diablo Canyon located?

Diablo Canyon is in San Luis Obispo County, CA, inside the CAISO balancing area.

Who operates Diablo Canyon?

Diablo Canyon is operated by Pacific Gas & Electric Co. according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Diablo Canyon generate?

Diablo Canyon reported 17,976.8 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

Where does Diablo Canyon connect to the grid?

Diablo Canyon interconnects at Diablo Canyon substation, on the Pacific Gas and Electric Company (PG&E) system.

How does Diablo Canyon compare to other plants?

By capacity, Diablo Canyon ranks #17 of 54 operating plants of the same technology nationally. It ranks #1 of 1 in CA.

Ask the Grid

⌘K

Grids

Library

Explore

Roadmap

Preferences

Free account

Open the analytical workspace

Detailed market and asset intelligence, plus the tools to keep and share the work.

Settlement-point price analytics
Plant & battery operating detail
Full Radar & Deep agent mode
Saved views, history & exports

Enterprise

Read your own grid

Your assets, topology, and trades — one decision surface with the agent.

Connect your own data
Private Grid
Probabilistic model forecasts
Data downloads & exports

Talk to us

About · Legal · Privacy · Changelog

NuclearCAISO · San Luis Obispo County

Diablo Canyon

Pacific Gas and Electric Company · San Luis Obispo County · CAISO

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.

Website Open in grid

Open in ATG map

Asset analyst

plant:plant-6099

Ask about Diablo Canyon

Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.

Overview

Key fields

Reported capacity: 2,323 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Nuclear
Primary generation technology.
Registry anchor: Plant 6099
Pacific Gas & Electric Co. · San Luis Obispo County · CAISO
Operating status: Operating
Diablo Canyon is currently operating; a closure or retirement is listed for June 2016.
Grid connection: Diablo Canyon substation
500 kV · Pacific Gas and Electric Company (PG&E)
Commercial operation: May 7, 1985
Best-supported operating milestone.

Profile

Operating status: Diablo Canyon is currently operating; a closure or retirement is listed for June 2016.
Grid role: 24/7 carbon-free generation and a grid-reliability resource.
Grid connection: Diablo Canyon substation · 500 kV · Pacific Gas and Electric Company (PG&E).
Physical build: Two Westinghouse four-loop pressurized-water reactor units (Units 1 and 2); EIA lists 2024 summer capacities of 1,122 MW for Unit 1 and 1,118 MW for Unit 2.

Structured profile

Reported capacity: 2,323 MW
Nuclear
Commercial operation: May 7, 1985
Operating status: operating
Diablo Canyon is currently operating; a closure or retirement is listed for June 2016.
Retirement: June 2016
Diablo Canyon is currently operating; a closure or retirement is listed for June 2016.
Interconnection

Units and generators

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

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 2,323 MW
National rank: #17
CA rank: #1

Monthly generation

Download CSV

Latest 12 months

17.98 TWh

Reported net generation

Latest report

Apr 2026

EIA-923 monthly filing

2025 capacity factor

86.3%

Using current reported nameplate capacity

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Nearby substations

HIFLD infrastructure inventory

PECHO VALLEY

NOT AVAILABLE · 230 kV

0.6 km

DIABLO CANYON

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Land and environmental record

Clean Water Act Section 401 Certification

Feb 26, 2026

Order 34024WQ31

The 2026 permitting action included a Clean Water Act Section 401 water-quality certification identified as Order 34024WQ31.

Source

Coastal Environmental Milestone

Dec 11, 2025

Coastal Zone Management Act consistency certification and Coastal Development Permit approved

California Coastal Commission voted to approve the consistency certification and Coastal Development Permit for Diablo Canyon on December 11, 2025.

State Coastal Commission Approves Diablo Canyon Certification | PG&E

Emissions And Radiological Controls

2023

NRC administrative effluent controls and radiological compliance controls

County EIR describes NRC administrative controls including self-assessment, audits and corrective actions, design control, safety review, maintenance and surveillance, radiation protection, and effluent controls for hazardous and radiological materials.

4.10 Hazardous and Radiological Materials

Land-Conservation And Coastal-Mitigation Commitment

Dec 11, 2025

Protect 4,500 acres of North Ranch; do not sell South Ranch before 2040

California Coastal Commission certification commitments include protecting 4,500 acres of North Ranch through conservation easements or transfer and committing not to sell South Ranch lands until 2040. If operations continue after 2030, additional conservation measures include expanding South Ranch conservation deed restrictions to 2,490 acres.

State Coastal Commission Approves Diablo Canyon Certification | PG&E

NPDES Wastewater Permit

Feb 26, 2026

Order R3-2026-0001; NPDES Permit CA0003751

Central Coast Regional Water Quality Control Board adopted Order R3-2026-0001 on February 26, 2026, as the current wastewater-discharge order. Supersedes the administratively extended Order 90-09 / NPDES Permit CA0003751, which expired July 1, 1995 but remained in force pending renewal.

Order No. R3-2026-0001

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

Drag organizations to explore the network. Select a node to pin its details and available page link.

AssetOwner / operatorContractorRelated asset

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

May 1985
May 1985
Generator enters operationEIA-860
EIA-860 lists generator 1 with this operating date.
May 7, 1985
May 7, 1985
Unit 1 commercial operation

Reporting portfolio

EIA reporting entity

Pacific Gas & Electric Co.

Entity 14328

Operating portfolio

60 plants

1 states

Reported capacity

7,470.5 MW

Conventional Hydroelectric · Hydroelectric Pumped Storage · Natural Gas Fired Combined Cycle

Largest reported plants in this portfolio
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 portfolio

Diablo Canyon

Ask about Diablo Canyon

Diablo Canyon

Ask about Diablo Canyon

Overview

Key fields

Profile

Structured profile

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

Relationship graph

Timeline and sources

Project timeline

Parties and identifiers

Reporting portfolio

Sources

Common questions about Diablo Canyon

How big is Diablo Canyon?

What kind of plant is Diablo Canyon?

Where is Diablo Canyon located?

Who operates Diablo Canyon?

How much electricity does Diablo Canyon generate?

Where does Diablo Canyon connect to the grid?

How does Diablo Canyon compare to other plants?

Co-located assets

Related assets

Dynegy Moss Landing Power Plant Hybrid

Ormond Beach

La Paloma Generating Plant

Topaz Solar Farm

Sunrise Power LLC

Helms Pumped Storage