How big is Gateway Generating Station?

Gateway Generating Station has a reported capacity of 619.7 MW. Source: EIA Form 860.

What kind of plant is Gateway Generating Station?

Gateway Generating Station is a Natural Gas Fired Combined Cycle facility in Contra Costa County, CA, participating in the CAISO market.

Where is Gateway Generating Station located?

Gateway Generating Station is in Contra Costa County, CA, inside the CAISO balancing area.

Who operates Gateway Generating Station?

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

When did Gateway Generating Station start operating?

Gateway Generating Station reports a commercial operation date of 2012. Current status: operating. Source: EIA Form 860.

How much electricity does Gateway Generating Station generate?

Gateway Generating Station reported 2,378.7 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.

Where does Gateway Generating Station connect to the grid?

Gateway Generating Station on the Pacific Gas and Electric Company (PG&E) system.

How does Gateway Generating Station compare to other plants?

By capacity, Gateway Generating Station ranks #229 of 538 operating plants of the same technology nationally. It ranks #19 of 64 in CA.

Gateway Generating Station — 620 MW gas plant, CA

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Gateway Generating Station — 620 MW gas plant, CA · Ask the Grid

Overview

Reported capacity: 619.7 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combined Cycle
Primary generation technology.
Registry anchor: Plant 56476
Pacific Gas & Electric Co. · Contra Costa County · CAISO
Operating status: Operating
Gateway Generating Station is currently operating; a closure or retirement is listed for March 24, 2026.
Commercial operation: 2012
Best-supported operating milestone.

Profile

Operating status: Gateway Generating Station is currently operating; a closure or retirement is listed for March 24, 2026.
Grid role: Flexible combined-cycle generation that ramps to support variable renewable generation and customer demand.
Context: Gateway was PG&E’s first new power plant in more than 20 years when it entered service, marking a significant return to new generation construction for the utility.
Physical build: Operational natural-gas combined-cycle facility consisting of two combustion-turbine generators, two heat-recovery steam generators, and one steam-turbine generator. Additional installed scope includes two 195-foot HRSG exhaust stacks, a 10-cell water-cooling tower, storage tanks, a control building, electrical transformers and transmission interconnection facilities, backup diesel generators, and related utility and safety upgrades. Project sources identify Black & Veatch as EPC, GE Power as turbine and electric-generator supplier, two GE 7F.04 gas turbines rated at 203.2 MW each, one GE D11 steam turbine rated at 213.3 MW, Vogt-NEM steam boilers/HRSGs, and an SPX air-cooled condenser; the SPX condenser model and count are not stated.

Structured profile

Reported capacity: 619.7 MW
Natural Gas Fired Combined Cycle
Commercial operation: 2012
Operating status: operating
Gateway Generating Station is currently operating; a closure or retirement is listed for March 24, 2026.
Retirement: March 24, 2026
Gateway Generating Station is currently operating; a closure or retirement is listed for March 24, 2026.
Location: Contra Costa County

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Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
A	203.2 MW 177 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Jan 2009	Operating
B	203.2 MW 177 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Jan 2009	Operating
C	213.3 MW 209.4 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CA	Jan 2009	Operating

Performance

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

Peer context

Technology capacity: 619.7 MW; Natural Gas Fired Combined Cycle
National rank: #229; of 538 operating peers
CA rank: #19; of 64 operating peers

Monthly generation

Download CSV

Latest 12 months

2.38 TWh

Reported net generation

Latest report

Jun 2026

EIA-923 monthly filing

2025 capacity factor

53.6%

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

CONTRA COSTA POWER

IN SERVICE · 230 kV

0.4 km

GWF 4

Commercial, land, and environmental record

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

Transactions and agreements

Initial Completion Capital-Cost Approval

Jun 15, 2006

The CPUC adopted $295 million as the reasonable and prudent estimate of the initial capital cost to complete Contra Costa Unit 8. This is an asset-specific completion-cost approval, not project debt.

$295.0MPacific Gas and Electric Company · California Public Utilities Commission

Source

Sole-Ownership Transfer And Renaming

Jan 2007

The California Energy Commission clarified that PG&E was the sole owner of Contra Costa Power Plant Unit 8, removed Mirant Delta LLC as co-owner, and changed the project name to Gateway Generating Station on January 23, 2007.

Pacific Gas and Electric Company · Mirant Delta LLC · California Energy Commission

Gateway Generating Station | California Energy Commission

Land and environmental record

Environmental Compliance

2025

Environmental-compliance milestones include the 2016 stormwater-treatment approval, a 2018 CEC settlement concerning reporting compliance, and 2025 annual monitoring.

CEC records identify approval of the stormwater-treatment system in October 2016 and an August 2018 settlement for PG&E reporting noncompliance. Annual Compliance Report No. 17 covers January 1 through December 31, 2025 and documents quarterly wastewater-flow reporting, CEMS reporting, stormwater-plan compliance, and biological-resource reporting.

Contra Costa Power Plant Project Compliance

Parcel Ownership

2021

Gateway Generating Station parcels APN 051-031-016 and APN 051-031-021; current owner PG&E.

A California environmental notice identifies the Gateway GS parcels as APNs 051-031-016 and 051-031-021 and lists PG&E as the current owner. The facility address is 3225 Wilbur Avenue, Antioch, California 94509.

CALIFORNIA ENVIRONMENTAL QUALITY ACT NOTICE OF EXEMPTION

Regulatory Filing

Mar 27, 2026

CEC docket TN 269339 records a March 2026 request to amend an air-quality condition.

A March 27, 2026 CEC docket entry states that the project owner requested an amendment to a Gateway Generating Station air-quality condition. The available docket snippet does not establish a retirement or repowering project.

Gateway Generation Station (00-AFC-01C)

Regulatory Status

Jan 4, 2009

CEC certification docket 00-AFC-01C; operational status.

The California Energy Commission identifies Gateway as a nominal 530-MW natural-gas combined-cycle facility, certified on May 30, 2001, with commercial operation beginning January 4, 2009. The CEC lists the project as operational.

Gateway Generating Station | California Energy Commission

Stormwater Permit

2018

Industrial stormwater coverage under California Water Quality Order 2014-0057-DWQ; WDID 5S07I021950.

The Gateway stormwater pollution prevention documentation identifies the California Industrial General Permit as Order 2014-0057-DWQ and gives Waste Discharge Identification Number 5S07I021950 for the facility at 3225 Wilbur Avenue. The CEC approved installation of a stormwater treatment system in 2016 to comply with the then-current Industrial General Permit.

Contra Costa Power Plant Project Compliance

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

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AssetOwner / operatorMarket / regulatorContractorFinancierRelated asset

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Jan 31, 2000
Jan 31, 2000
Application for certification filedSource
Mirant Delta, LLC filed an Application for Certification with the California Energy Commission for the 530-MW Contra Costa Power Plant Unit 8 project.
Jul 27, 2006
Jul 27, 2006
PG&E added as co-owner and operator

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 Canyon	2,323 MW	CA
Helms Pumped Storage	1,053 MW	CA
Colusa Generating Station	712.4 MW	CA
Gateway Generating StationCurrent	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

Gateway Generating Station