O W Sommers — Plant Summary
- EIA Plant ID
- 3611
- Capacity
- 892 MW
- Primary Fuel
- Natural Gas
- Technology
- Natural Gas Steam Turbine
- Status
- Operating
- Location
- Bexar, TX
- Operating Since
- 1972
- Generators
- 2
- Operator
- City of San Antonio - (TX)
- Parent Company
- —
- Annual Generation
- 2,533,074 MWh
- Capacity Factor
- 32.3%
- Balancing Authority
- Electric Reliability Council of Texas, Inc.
- ISO/RTO
- ERCOT
- NERC Region
- TRE
O W Sommers
OperatingNatural Gas
Ranked #34 of 313 Natural Gas plants in TX#208 of 2009 nationally
892 MW Natural Gas operating in Bexar, TX — Electric Reliability Council of Texas, Inc.
EIAWD
892 MW
Nameplate Capacity
2
Generators
units
Natural Gas Steam Turbine
Technology
1972
Operating Since
Location
Coordinates
29.3081, -98.3242
County
Bexar, TX
Nearby Plants
- J K SpruceSub. Coal1488.5 MW · 0.4 km
- Padua 2BESS150 MW · 1.9 km
- Padua 3BESS200 MW · 1.9 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | City of San Antonio - (TX) | — | — |
| Owner(s) | City of San Antonio - (TX) | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
The O W Sommers power plant is located in Bexar County, Texas. The plant has a total capacity of 892 MW across two generators utilizing natural gas steam turbine technology. It began operating in 1972 and is owned and operated by City of San Antonio - (TX). The plant operates within the Electric Reliability Council of Texas (ERCOT) balancing authority.
In the most recent year of data, O W Sommers generated 2,533,074 MWh of electricity, achieving a capacity factor of 32.3%. The plant is ranked as the 35th largest in Texas out of 144 plants, and nationally it is ranked 213th out of 945 plants.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
TRE
Balancing Authority
Electric Reliability Council of Texas, Inc.
Grid Voltage
138 kV
Regulatory Status
RE
Entity Type
Municipal
Sector
Electric Utility
Generation
187.2K MWh
Latest Month
2.5M MWh
Annual Generation
32.3%
Capacity Factor
Jan 2022 – Dec 2024
Financial Data
No financial data available for this plant.
Pricing & Market Data
HIGH confidencePoint of Interconnection
Nearest Substation
O. W. Sommers Switchyard · 138 kV
Substation Distance
< 10 km
Operator
CPS Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ERCOT
LMP Node
CALAVER_OWS1
Pricing Hub
HB_SOUTH
Secondary Zone
LZ_SOUTH
Location Type
Resource Node
Node Source
EIA-860 direct report
News & Articles (9)Beta
Grid·capacity addition
Texas grid's largest stand-alone battery storage site is rising in South San Antonio
CPS Energy and Eolian to add 400 megawatts of battery capacity near ERCOT San Antonio transmission chokepoint.
CPS Energy (operator)Eolian (developer)
San Antonio Express-News·1 years ago
Industry·corporate
CPS Energy moves to close gas-fired Braunig plant by spring 2025
After operating for nearly six decades, all three gas-fired units at the Braunig power station are slated to be shuttered by March 31, 2025.
CPS Energy (operator)
San Antonio Report·2 years ago
Industry·other
Map: The 10 biggest polluters in Bexar County, according to EPA
EPA data shows where greenhouse gas emissions come from in Bexar County. The data covers 2020, the most recently available reporting year.
EPA (regulator)Bexar County (other)
KSAT·3 years ago
Industry·corporate
With fossil fuel plant closures looming, CPS Energy weighs future generation options
With its financial future stabilized, CPS Energy officials have shifted their focus to the future of the utility's generation portfolio.
CPS Energy (operator)
San Antonio Report·3 years ago
Last updated 2026-03-14
View all 9 articles