O W Sommers
Natural gas power plant in Bexar County, Texas. 892 MW of nameplate capacity across 2 generators, operated by City of San Antonio - (TX).
Also known as O W Sommers Power Plant · O.W. Sommers · OW Sommers · EIA plant 3611
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Key facts
- Capacity
- 892 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- April 1972First generator online
- Operator
- City of San Antonio - (TX)EIA operator ID 16604
- Grid
- ERCOTBalancing authority ERCO
- Price nodes
- 2 ERCOT nodesResource nodes with prices
- Location
- Bexar County, TX29.3081, −98.3242
- EIA plant ID
- 3611EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power O W Sommers produces
Free · EIA-923Net generation, 2025
2.28 TWh
2,278,173 MWh, final
Capacity factor, 2025
29.2%
2024: 32.3%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
0.4–2.5
TWh a year. Low 2017, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 2,564,440 | Not reported | 12 of 12 |
| 2001 | 1,206,473 | Not reported | 12 of 12 |
| 2002 | 814,900 | Not reported | 12 of 12 |
| 2003 | 739,875 | Not reported | 12 of 12 |
| 2004 | 644,014 | Not reported | 12 of 12 |
| 2005 | 966,683 | Not reported | 12 of 12 |
| 2006 | 1,305,476 | Not reported | 12 of 12 |
| 2007 | 1,402,671 | Not reported | 12 of 12 |
| 2008 | 1,390,282 | Not reported | 12 of 12 |
| 2009 | 1,360,929 | Not reported | 12 of 12 |
| 2010 | 761,004 | 9.7% | 12 of 12 |
| 2011 | 437,466 | 5.6% | 12 of 12 |
| 2012 | 660,065 | 8.4% | 12 of 12 |
| 2013 | 800,447 | 10.2% | 12 of 12 |
| 2014 | 470,944 | 6.0% | 12 of 12 |
| 2015 | 517,210 | 6.6% | 12 of 12 |
| 2016 | 424,289 | 5.4% | 12 of 12 |
| 2017 | 421,778 | 5.4% | 12 of 12 |
| 2018 | 912,427 | 11.7% | 12 of 12 |
| 2019 | 1,108,627 | 14.2% | 12 of 12 |
| 2020 | 914,438 | 11.7% | 12 of 12 |
| 2021 | 1,166,289 | 14.9% | 12 of 12 |
| 2022 | 1,401,272 | 17.9% | 12 of 12 |
| 2023 | 1,904,802 | 24.4% | 12 of 12 |
| 2024 | 2,531,728 | 32.3% | 12 of 12 |
| 2025 | 2,278,173 | 29.2% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · ERCOTEmissions
Free · EPA CAMPDCO₂, 2025
1.40M
US short tons. 2024: 1.61M
SO₂, 2025
7
US short tons
NOx, 2025
2,257
US short tons
CO₂ per MWh, calculated
0.62 t
About 1,233 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (1, 2), matched to EIA plant 3611 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
180,452
million gallons
Consumption, 2024
3,735
million gallons
Source
Calaveras Lake
Surface, Fresh. Recirculating with cooling pond
Watershed stress
Severe · 0.875
USGS SUI, HUC12 Upper Calaveras Creek
24 of 24 cooling months report withdrawal. SUI of the HUC12 containing the plant. Cooling-pond plants report water circulated through the pond as withdrawal, so withdrawal is far above consumption. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Natural Gas Steam Turbine | 446.0 | April 1972 |
| 2 | Natural Gas Steam Turbine | 446.0 | January 1974 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists City of San Antonio - (TX) as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near O W Sommers
More plants operated by City of San Antonio - (TX)
Questions about O W Sommers
How much power does O W Sommers produce?
O W Sommers reported 2,278,173 MWh (2.28 TWh) of net generation in 2025, a 29.2% capacity factor on 892 MW of nameplate capacity.
Where is O W Sommers?
O W Sommers is in Bexar County, Texas, at 29.3081, −98.3242. It is in the Electric Reliability Council of Texas, Inc. balancing area (ERCO).
Who operates O W Sommers?
EIA-860M for August 2026 lists City of San Antonio - (TX) as the operator (EIA operator ID 16604). The operator is not always the owner.
When did O W Sommers start operating?
Its first generator began operating in April 1972, according to EIA-860M.
Does InfraMap have power prices for O W Sommers?
Yes. InfraMap has ERCOT day-ahead and real-time prices at 2 price nodes linked to O W Sommers, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- ERCOT day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page