O W Sommers is a natural gas-fired power facility with 892 MW of EIA-reported nameplate capacity in Bexar County, Texas, registered as EIA Plant ID 3611. City of San Antonio - (TX) is the registered plant entity or operator. The plant's generating configuration is two natural-gas steam-turbine generating units.
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
City of San Antonio - (TX) · Bexar County · ERCOT
O W Sommers is currently operating; a closure or retirement is listed for February 2027.
CALAVERS_OWS1 · CALAVERS_OWS2
ERCOT settlement point.
Natural Gas Steam Turbine
O W Sommers is currently operating; a closure or retirement is listed for February 2027.
O W Sommers is currently operating; a closure or retirement is listed for February 2027.
ERCOT
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 446 MW 420 MW summer | Natural Gas Steam Turbine Natural Gas · ST | Apr 1972 Retirement: Mar 2027 | Operating |
| 2 | 446 MW 410 MW summer | Natural Gas Steam Turbine Natural Gas · ST | Jan 1974 Retirement: Mar 2029 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
EIA-860 lists generator 1 with this operating date.
ERCOT · Bexar County
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
2 ERCOT market resources · Gas steam
Capacity factor is average output vs. this plant's observed peak.
Observed ERCOT settlement prices at CALAVER_OWS1 over 365 days (2025-09-18 to 2026-09-17). This plant is also crosswalked to CALAVER_OWS2; the point with the deepest price history is shown.
The TB2 figure is a price benchmark, not revenue: it values one perfect-foresight cycle per day between the 2 cheapest and 2 dearest hours of each day, gross of round-trip losses, and excludes ancillary services and any physical dispatch constraint. It describes what this node’s price shape was worth over the window — it is not this asset’s realized capture, and no dispatch is assumed or modelled.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| J K Spruce | 1,488.5 MW | TX | |
| V H Braunig | 1,138 MW | TX | |
| Barney M Davis | 1,082.2 MW | TX | |
| Rio Nogales Power Project | 940.2 MW | TX | |
| O W SommersCurrent | 892 MW | TX | |
| Nueces Bay | 730.2 MW | TX | |
| Topaz Generating | 605 MW | TX | |
| Arthur Von Rosenberg | 575 MW | TX |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioUnit 2 entered service in 1974. CPS Energy planning tables list Unit 2 at 410 MW of summer capacity.
EIA-860 lists generator 2 with this operating date.
CPS Energy's Flexible Path Resource Plan listed potential end-of-life dates of 2026 for Unit 1 and 2028 for Unit 2. The document characterized these as planning assumptions rather than a finalized Board decision.
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
EIA-860 lists a planned retirement for generator 1.
EIA-860 lists a planned retirement for generator 2.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
O W Sommers has a reported capacity of 892 MW. Source: EIA Form 860.
O W Sommers is a Natural Gas Steam Turbine facility in Bexar County, TX, participating in the ERCOT market.
O W Sommers is in Bexar County, TX, inside the ERCOT balancing area.
O W Sommers is operated by City of San Antonio - (TX) according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
O W Sommers reported 2,531.7 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.
O W Sommers settles at CALAVER_OWS1, on the CPS Energy system.
By capacity, O W Sommers ranks #33 of 257 operating plants of the same technology nationally. It ranks #8 of 32 in TX.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
