- Combustion
- Wind & solar
- Storage
- Bioenergy
- Loads
- In development
- Under construction
- Retired
- Stage not stated
- Size not stated
- 10 · 100 · 1,000 MW
Map
- Combustion
- Wind & solar
- Storage
- Bioenergy
- Loads
- In development
- Under construction
- Retired
- Stage not stated
- Size not stated
United Cogen: location and 6 exact-grade projects within 25 km. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
United Cogen
Power plant · Gas, combined cycle
Key facts
Power plant · Gas, combined cycleran 71% of 2011 Retired- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1985
- Net generation, 2011
- 192,949 MWh
- Location
- San Mateo County, California
- Operated by
- United Cogen IncSourceEIA-860M Preliminary Monthly Electric Generator Inventory
Output
- Gas
- Oil
Details
Who’s behind it
No companies named in filings yet.
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- Technology
- Gas, combined cycle source: “Natural Gas Fired Combined Cycle”
- Age
- 41 years since 1985
Retirement
EIA-860M September 2026StatusEvery generator EIA lists at this plant has retired. As of EIA-860M for September 2026.- Retired
- January 2012
- Capacity retired
- 31 MW
- Generators retired
- 2
| Generator | Technology | Nameplate | State | Date |
|---|---|---|---|---|
| G-1 | Natural Gas Fired Combined Cycle | 23 MW | Retired | January 2012 |
| G-2 | Natural Gas Fired Combined Cycle | 8 MW | Retired | January 2012 |
Grid
Not in EIA-860Grid fieldsEIA-860 states no grid voltage or transmission owner for this plant: its annual file lists plants with a generator in the report year, so a plant that retired earlier is not in it.Transmission lines within 25 km (10)
Connection points within 25 km (1)
Can the connection be reused?
A plant that retires usually leaves its substation, transmission connection and interconnection agreement behind, and those may be reusable by a new project at the same site. FERC Order No. 845 lets an interconnection customer use surplus interconnection service at an existing site, and some transmission providers' tariffs let a replacement resource take over a retiring unit's interconnection service, usually within a set time after the retirement. Whether any such right still exists here, who holds it and on what terms depends on the owner, the transmission provider and timing; this page does not establish any of that.
Timeline
- Stated Units G-1, G-2 scheduled to retire, 31 MW · EIA-860M
- In service · EIA-860M
Sources
5 sourcesSources EIA-860M · LBNL · CAISO · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory
Sources
- EIA-860M
- LBNLYin, Nait Belaid & Heleno (2026), Lawrence Berkeley National Laboratory, OEDI, CC BY 4.0: A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Modified by Inframation: HIFLD-side fields only, names re-cased, coordinates rounded.
- CAISOSource: California ISO
- EIASource: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
- EIA-860M Preliminary Monthly Electric Generator Inventory
Around this plant
Nearby
within 25 km| Project | Kind | Away | MW |
|---|---|---|---|
| San Francisco Intl Airport Ct Project Postponed | Gas, combustion turbine | 0.8 km | 48 |
| Ameresco Ox Mountain Filed | Biomass | 14.7 km | 3 |
| San Francisco Electric Reliability Proj Withdrawn | Gas, combustion turbine | 17.1 km | 151.5 |
| San Leandro 10 - sleba702 Under construction | Solar | 20.6 km | 1 |
| Dynegy Oakland Power Plant Announced | Storage | 20.7 km | 43.3 |
| HAYWARD DATA CENTER Unknown | Large load | 24.5 km |
Sources EIA-860M · CAISO · EPA ICIS-NPDES