# O W Sommers

ERCOT Natural Gas Steam Turbine · https://askthegrid.com/assets/facilities/o-w-sommers

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.

## Key facts

- Technology: Natural Gas Steam Turbine
- Power capacity: 892 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: ERCOT
- Balancing authority: ERCOT (ERCO)
- Settlement node: CALAVER_OWS1
- Transmission owner: CPS Energy
- Market resources: CALAVERS_OWS1, CALAVERS_OWS2

## Source-backed facts

- Owner logo domain: cpsenergy.com — Energy Generation · confidence: medium
- Identifiers: [{"value":"3611","system":"EIA plant ID"},{"value":"ERCO","system":"Balancing Authority"},{"value":"ERCOT","system":"ISO/RTO / power market"},{"value":"3611_B_1","system":"EIA generator record"},{"value":"3611_B_2","system":"EIA generator record"},{"value":"O W SOMMERS STG U1","system":"ERCOT generator name"},{"value":"O W SOMMERS STG U2","system":"ERCOT generator name"},{"value":"CALAVERS_OWS1","system":"ERCOT market resource"},{"value":"CALAVERS_OWS2","system":"ERCOT market resource"},{"value":"54308","system":"Texas PUC docket"}] — Source · confidence: medium
- Identifiers: [{"value":"3611","system":"EIA plant ID"},{"value":"ERCO","system":"Balancing Authority"},{"value":"ERCOT","system":"ISO/RTO / power market"},{"value":"3611_B_1","system":"EIA generator record"},{"value":"3611_B_2","system":"EIA generator record"},{"value":"O W SOMMERS STG U1","system":"ERCOT generator name"},{"value":"O W SOMMERS STG U2","system":"ERCOT generator name"},{"value":"CALAVERS_OWS1","system":"ERCOT market resource"},{"value":"CALAVERS_OWS2","system":"ERCOT market resource"},{"value":"54308","system":"Texas PUC docket"}] — Plant Name · confidence: medium
- Identifiers: [{"value":"3611","system":"EIA plant ID"},{"value":"ERCO","system":"Balancing Authority"},{"value":"ERCOT","system":"ISO/RTO / power market"},{"value":"3611_B_1","system":"EIA generator record"},{"value":"3611_B_2","system":"EIA generator record"},{"value":"O W SOMMERS STG U1","system":"ERCOT generator name"},{"value":"O W SOMMERS STG U2","system":"ERCOT generator name"},{"value":"CALAVERS_OWS1","system":"ERCOT market resource"},{"value":"CALAVERS_OWS2","system":"ERCOT market resource"},{"value":"54308","system":"Texas PUC docket"}] — ERCOT Official Document · confidence: medium
- Identifiers: [{"value":"3611","system":"EIA plant ID"},{"value":"ERCO","system":"Balancing Authority"},{"value":"ERCOT","system":"ISO/RTO / power market"},{"value":"3611_B_1","system":"EIA generator record"},{"value":"3611_B_2","system":"EIA generator record"},{"value":"O W SOMMERS STG U1","system":"ERCOT generator name"},{"value":"O W SOMMERS STG U2","system":"ERCOT generator name"},{"value":"CALAVERS_OWS1","system":"ERCOT market resource"},{"value":"CALAVERS_OWS2","system":"ERCOT market resource"},{"value":"54308","system":"Texas PUC docket"}] — Source · confidence: medium
- Identifiers: [{"value":"3611","system":"EIA plant ID"},{"value":"ERCO","system":"Balancing Authority"},{"value":"ERCOT","system":"ISO/RTO / power market"},{"value":"3611_B_1","system":"EIA generator record"},{"value":"3611_B_2","system":"EIA generator record"},{"value":"O W SOMMERS STG U1","system":"ERCOT generator name"},{"value":"O W SOMMERS STG U2","system":"ERCOT generator name"},{"value":"CALAVERS_OWS1","system":"ERCOT market resource"},{"value":"CALAVERS_OWS2","system":"ERCOT market resource"},{"value":"54308","system":"Texas PUC docket"}] — Source · confidence: medium
- Description: O W Sommers is an operating natural-gas power plant in Bexar County, Texas, identified by EIA plant ID 3611. The plant has two generating units with 892 MW of total nameplate capacity and 830 MW of summer and winter capacity. CPS Energy owns the plant, and City of San Antonio - (TX) is listed as its operator. The units are gas steam turbines; Unit 1 entered service in 1972 and Unit 2 in 1974. — Source · confidence: medium
- Description: O W Sommers is an operating natural-gas power plant in Bexar County, Texas, identified by EIA plant ID 3611. The plant has two generating units with 892 MW of total nameplate capacity and 830 MW of summer and winter capacity. CPS Energy owns the plant, and City of San Antonio - (TX) is listed as its operator. The units are gas steam turbines; Unit 1 entered service in 1972 and Unit 2 in 1974. — Source · confidence: medium
- Description: O W Sommers is an operating natural-gas power plant in Bexar County, Texas, identified by EIA plant ID 3611. The plant has two generating units with 892 MW of total nameplate capacity and 830 MW of summer and winter capacity. CPS Energy owns the plant, and City of San Antonio - (TX) is listed as its operator. The units are gas steam turbines; Unit 1 entered service in 1972 and Unit 2 in 1974. — Source · confidence: medium
- Identifiers.3: {"value":"3611_B_1","system":"EIA generator record"} — Source · confidence: medium
- Identifiers.4: {"value":"3611_B_2","system":"EIA generator record"} — Plant Name · confidence: medium
- Identifiers.5: {"value":"O W SOMMERS STG U1","system":"ERCOT generator name"} — ERCOT Official Document · confidence: medium
- Identifiers.6: {"value":"O W SOMMERS STG U2","system":"ERCOT generator name"} — ERCOT Official Document · confidence: medium
- Identifiers.7: {"value":"CALAVERS_OWS1","system":"ERCOT market resource"} — Source · confidence: medium
- Identifiers.8: {"value":"CALAVERS_OWS2","system":"ERCOT market resource"} — Source · confidence: medium
- Identifiers.9: {"value":"54308","system":"Texas PUC docket"} — Source · confidence: medium
- Parties.0: {"relationship":"Owner","name":"CPS Energy","official_url":"https://www.cpsenergy.com/"} — Source · confidence: high
- Interconnection: O.W. Sommers 138 kV switchyard/grid connection; transmission/distribution owner: City of San Antonio - (TX). — Interchange - Documents · confidence: medium
- Product url: https://www.gevernova.com/gas-power/products/steam-turbines — Steam Turbine Power Plant Solutions | GE Vernova · confidence: medium
- Description: O W Sommers is an operating 892 MW natural-gas power plant in Bexar County, Texas, with two gas steam-turbine units. CPS Energy is identified as the owner, while City of San Antonio - (TX) is listed as the operator. Unit 1 entered service in April 1972 and Unit 2 in 1974. CPS Energy planning documents and its January 2023 generation portfolio plan contemplated retirement of Unit 1 in March 2027 and Unit 2 in March 2029; plant records still listed the facility as operational on 2026-08-02. — CPS Energy to retire aging gas units in 2025 · confidence: medium
- Quality notes: ["The facility remained listed as operational as of 2026-08-02, while the 2021 resource plan and later portfolio plan describe future retirement targets rather than completed retirements.","The plant-level record reports 892 MW of nameplate capacity and 830 MW of summer and winter capacity; unit planning tables separately report 420 MW for Unit 1 and 410 MW for Unit 2.","No separate acquisition or sale transaction, buyer, seller, transaction month/year, project-financing amount, or repowering event is identified for O W Sommers. A $335,257,976.42 CPS Energy bond ordinance references the Calaveras Site/Sommers Power Station but does not allocate proceeds specifically to O W Sommers."] — OUR JANUARY 2021 FLEXIBLE PATH RESOURCE PLAN PUBLIC INFORMATION · confidence: medium
- Quality notes: ["The facility remained listed as operational as of 2026-08-02, while the 2021 resource plan and later portfolio plan describe future retirement targets rather than completed retirements.","The plant-level record reports 892 MW of nameplate capacity and 830 MW of summer and winter capacity; unit planning tables separately report 420 MW for Unit 1 and 410 MW for Unit 2.","No separate acquisition or sale transaction, buyer, seller, transaction month/year, project-financing amount, or repowering event is identified for O W Sommers. A $335,257,976.42 CPS Energy bond ordinance references the Calaveras Site/Sommers Power Station but does not allocate proceeds specifically to O W Sommers."] — CPS Energy to retire aging gas units in 2025 · confidence: medium
- Quality notes: ["The facility remained listed as operational as of 2026-08-02, while the 2021 resource plan and later portfolio plan describe future retirement targets rather than completed retirements.","The plant-level record reports 892 MW of nameplate capacity and 830 MW of summer and winter capacity; unit planning tables separately report 420 MW for Unit 1 and 410 MW for Unit 2.","No separate acquisition or sale transaction, buyer, seller, transaction month/year, project-financing amount, or repowering event is identified for O W Sommers. A $335,257,976.42 CPS Energy bond ordinance references the Calaveras Site/Sommers Power Station but does not allocate proceeds specifically to O W Sommers."] — SEPTEMBER-26-2022-BOARD-MEETING-FOR-... · confidence: medium
- Financing summary: No plant-specific acquisition price, sale consideration, or project-financing amount is disclosed. The available CPS Energy board material references a $335,257,976.42 New Series Bond Ordinance in September 2022 for the Calaveras Site/Sommers Power Station, but does not identify an O W Sommers-specific allocation; it is therefore not treated as project financing for this plant. No separate buyer, seller, or acquisition month/year is established. — SEPTEMBER-26-2022-BOARD-MEETING-FOR-... · confidence: medium
- Financing summary: No plant-specific acquisition price, sale consideration, or project-financing amount is disclosed. The available CPS Energy board material references a $335,257,976.42 New Series Bond Ordinance in September 2022 for the Calaveras Site/Sommers Power Station, but does not identify an O W Sommers-specific allocation; it is therefore not treated as project financing for this plant. No separate buyer, seller, or acquisition month/year is established. — O W Sommers Power Plant, US · confidence: medium
- Timeline: [{"event":"Unit 1 commercial operation","date":"1972-04","detail":"O W Sommers Unit 1 entered service in April 1972; plant records identify the facility as a natural-gas steam-turbine plant."},{"event":"Unit 2 commercial operation","date":"1974","detail":"Unit 2 entered service in 1974. CPS Energy planning tables list Unit 2 at 410 MW of summer capacity."},{"event":"Retirement planning milestone","date":"2021-01-25","detail":"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."},{"event":"Generation portfolio retirement plan","date":"2023-01","detail":"The CPS Energy generation portfolio plan was approved in January 2023; later reporting described planned retirement of Unit 1 in March 2027 and Unit 2 in March 2029."},{"event":"Operational status","date":"2026-08-02","detail":"The plant was listed as operational, with two generating units and 892 MW of total nameplate capacity."},{"event":"Ownership and transfer status","date":null,"detail":"Public plant records identify CPS Energy as the current owner and City of San Antonio - (TX) as operator. No separate acquisition, sale, predecessor-owner transfer, or transaction month/year is reported for the plant."}] — O W Sommers Power Plant, US · confidence: medium
- Timeline: [{"event":"Unit 1 commercial operation","date":"1972-04","detail":"O W Sommers Unit 1 entered service in April 1972; plant records identify the facility as a natural-gas steam-turbine plant."},{"event":"Unit 2 commercial operation","date":"1974","detail":"Unit 2 entered service in 1974. CPS Energy planning tables list Unit 2 at 410 MW of summer capacity."},{"event":"Retirement planning milestone","date":"2021-01-25","detail":"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."},{"event":"Generation portfolio retirement plan","date":"2023-01","detail":"The CPS Energy generation portfolio plan was approved in January 2023; later reporting described planned retirement of Unit 1 in March 2027 and Unit 2 in March 2029."},{"event":"Operational status","date":"2026-08-02","detail":"The plant was listed as operational, with two generating units and 892 MW of total nameplate capacity."},{"event":"Ownership and transfer status","date":null,"detail":"Public plant records identify CPS Energy as the current owner and City of San Antonio - (TX) as operator. No separate acquisition, sale, predecessor-owner transfer, or transaction month/year is reported for the plant."}] — OUR JANUARY 2021 FLEXIBLE PATH RESOURCE PLAN PUBLIC INFORMATION · confidence: medium
- Timeline: [{"event":"Unit 1 commercial operation","date":"1972-04","detail":"O W Sommers Unit 1 entered service in April 1972; plant records identify the facility as a natural-gas steam-turbine plant."},{"event":"Unit 2 commercial operation","date":"1974","detail":"Unit 2 entered service in 1974. CPS Energy planning tables list Unit 2 at 410 MW of summer capacity."},{"event":"Retirement planning milestone","date":"2021-01-25","detail":"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."},{"event":"Generation portfolio retirement plan","date":"2023-01","detail":"The CPS Energy generation portfolio plan was approved in January 2023; later reporting described planned retirement of Unit 1 in March 2027 and Unit 2 in March 2029."},{"event":"Operational status","date":"2026-08-02","detail":"The plant was listed as operational, with two generating units and 892 MW of total nameplate capacity."},{"event":"Ownership and transfer status","date":null,"detail":"Public plant records identify CPS Energy as the current owner and City of San Antonio - (TX) as operator. No separate acquisition, sale, predecessor-owner transfer, or transaction month/year is reported for the plant."}] — CPS Energy to retire aging gas units in 2025 · confidence: medium
- Commercial parties: [{"relationship":"Owner","name":"CPS Energy","detail":"Current owner of the O W Sommers power plant. CPS Energy is the municipally owned electric and natural-gas utility serving San Antonio.","official_url":"https://www.cpsenergy.com/"},{"relationship":"Operator","name":"City of San Antonio - (TX)","detail":"Listed by EIA plant records as the operating entity for O W Sommers.","official_url":"https://www.sa.gov/Home"},{"relationship":"Historical OEM / equipment supplier","name":"GE Power","detail":"Power-plant project information identifies GE Power steam turbines at both units and identifies GE Power as the boiler supplier for Unit 1. The historical GE Power reference is linked to GE Vernova's current official corporate site.","official_url":"https://www.gevernova.com/"}] — O W Sommers Power Plant, US · confidence: medium
- Commercial parties: [{"relationship":"Owner","name":"CPS Energy","detail":"Current owner of the O W Sommers power plant. CPS Energy is the municipally owned electric and natural-gas utility serving San Antonio.","official_url":"https://www.cpsenergy.com/"},{"relationship":"Operator","name":"City of San Antonio - (TX)","detail":"Listed by EIA plant records as the operating entity for O W Sommers.","official_url":"https://www.sa.gov/Home"},{"relationship":"Historical OEM / equipment supplier","name":"GE Power","detail":"Power-plant project information identifies GE Power steam turbines at both units and identifies GE Power as the boiler supplier for Unit 1. The historical GE Power reference is linked to GE Vernova's current official corporate site.","official_url":"https://www.gevernova.com/"}] — Energy Generation · confidence: medium
- Commercial parties: [{"relationship":"Owner","name":"CPS Energy","detail":"Current owner of the O W Sommers power plant. CPS Energy is the municipally owned electric and natural-gas utility serving San Antonio.","official_url":"https://www.cpsenergy.com/"},{"relationship":"Operator","name":"City of San Antonio - (TX)","detail":"Listed by EIA plant records as the operating entity for O W Sommers.","official_url":"https://www.sa.gov/Home"},{"relationship":"Historical OEM / equipment supplier","name":"GE Power","detail":"Power-plant project information identifies GE Power steam turbines at both units and identifies GE Power as the boiler supplier for Unit 1. The historical GE Power reference is linked to GE Vernova's current official corporate site.","official_url":"https://www.gevernova.com/"}] — Welcome to CPS Energy · confidence: medium
- Commercial parties: [{"relationship":"Owner","name":"CPS Energy","detail":"Current owner of the O W Sommers power plant. CPS Energy is the municipally owned electric and natural-gas utility serving San Antonio.","official_url":"https://www.cpsenergy.com/"},{"relationship":"Operator","name":"City of San Antonio - (TX)","detail":"Listed by EIA plant records as the operating entity for O W Sommers.","official_url":"https://www.sa.gov/Home"},{"relationship":"Historical OEM / equipment supplier","name":"GE Power","detail":"Power-plant project information identifies GE Power steam turbines at both units and identifies GE Power as the boiler supplier for Unit 1. The historical GE Power reference is linked to GE Vernova's current official corporate site.","official_url":"https://www.gevernova.com/"}] — City of San Antonio: Home · confidence: medium
- Commercial parties.0: {"relationship":"Owner","name":"CPS Energy","detail":"Current owner of the O W Sommers power plant. CPS Energy is the municipally owned electric and natural-gas utility serving San Antonio.","official_url":"https://www.cpsenergy.com/"} — O W Sommers Power Plant, US · confidence: medium
- Commercial parties.0: {"relationship":"Owner","name":"CPS Energy","detail":"Current owner of the O W Sommers power plant. CPS Energy is the municipally owned electric and natural-gas utility serving San Antonio.","official_url":"https://www.cpsenergy.com/"} — Welcome to CPS Energy · confidence: medium
- Commercial parties.1: {"relationship":"Operator","name":"City of San Antonio - (TX)","detail":"Listed by EIA plant records as the operating entity for O W Sommers.","official_url":"https://www.sa.gov/Home"} — City of San Antonio: Home · confidence: medium
- Commercial parties.2: {"relationship":"Historical OEM / equipment supplier","name":"GE Power","detail":"Power-plant project information identifies GE Power steam turbines at both units and identifies GE Power as the boiler supplier for Unit 1. The historical GE Power reference is linked to GE Vernova's current official corporate site.","official_url":"https://www.gevernova.com/"} — O W Sommers Power Plant, US · confidence: medium
- Commercial parties.2: {"relationship":"Historical OEM / equipment supplier","name":"GE Power","detail":"Power-plant project information identifies GE Power steam turbines at both units and identifies GE Power as the boiler supplier for Unit 1. The historical GE Power reference is linked to GE Vernova's current official corporate site.","official_url":"https://www.gevernova.com/"} — Steam Turbine Power Plant Solutions · confidence: medium
- Quality notes.0: The facility remained listed as operational as of 2026-08-02, while the 2021 resource plan and later portfolio plan describe future retirement targets rather than completed retirements. — OUR JANUARY 2021 FLEXIBLE PATH RESOURCE PLAN PUBLIC INFORMATION · confidence: medium
- Quality notes.1: The plant-level record reports 892 MW of nameplate capacity and 830 MW of summer and winter capacity; unit planning tables separately report 420 MW for Unit 1 and 410 MW for Unit 2. — OUR JANUARY 2021 FLEXIBLE PATH RESOURCE PLAN PUBLIC INFORMATION · confidence: medium
- Quality notes.2: No separate acquisition or sale transaction, buyer, seller, transaction month/year, project-financing amount, or repowering event is identified for O W Sommers. A $335,257,976.42 CPS Energy bond ordinance references the Calaveras Site/Sommers Power Station but does not allocate proceeds specifically to O W Sommers. — SEPTEMBER-26-2022-BOARD-MEETING-FOR-... · confidence: medium
- Quality notes.2: No separate acquisition or sale transaction, buyer, seller, transaction month/year, project-financing amount, or repowering event is identified for O W Sommers. A $335,257,976.42 CPS Energy bond ordinance references the Calaveras Site/Sommers Power Station but does not allocate proceeds specifically to O W Sommers. — O W Sommers Power Plant, US · confidence: medium
- Timeline.0: {"event":"Unit 1 commercial operation","date":"1972-04","detail":"O W Sommers Unit 1 entered service in April 1972; plant records identify the facility as a natural-gas steam-turbine plant."} — O W Sommers Power Plant, US · confidence: medium
- Timeline.0: {"event":"Unit 1 commercial operation","date":"1972-04","detail":"O W Sommers Unit 1 entered service in April 1972; plant records identify the facility as a natural-gas steam-turbine plant."} — CEO Report for Board Meeting January 2021 · confidence: medium
- Timeline.1: {"event":"Unit 2 commercial operation","date":"1974","detail":"Unit 2 entered service in 1974. CPS Energy planning tables list Unit 2 at 410 MW of summer capacity."} — CEO Report for Board Meeting January 2021 · confidence: medium
- Timeline.2: {"event":"Retirement planning milestone","date":"2021-01-25","detail":"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."} — OUR JANUARY 2021 FLEXIBLE PATH RESOURCE PLAN PUBLIC INFORMATION · confidence: medium
- Timeline.3: {"event":"Generation portfolio retirement plan","date":"2023-01","detail":"The CPS Energy generation portfolio plan was approved in January 2023; later reporting described planned retirement of Unit 1 in March 2027 and Unit 2 in March 2029."} — CPS Energy to retire aging gas units in 2025 · confidence: medium
- Timeline.5: {"event":"Ownership and transfer status","date":null,"detail":"Public plant records identify CPS Energy as the current owner and City of San Antonio - (TX) as operator. No separate acquisition, sale, predecessor-owner transfer, or transaction month/year is reported for the plant."} — O W Sommers Power Plant, US · confidence: medium
- Transaction scope: corporate_parent_only — Br. · confidence: medium
- Market resource ids: ["CALAVERS_OWS1","CALAVERS_OWS2"] — Source · confidence: high
- Market resource ids.0: CALAVERS_OWS1 — Source · confidence: high
- Market resource ids.1: CALAVERS_OWS2 — Source · confidence: high

## Timeline

- 1974 — Unit 2 commercial operation
  Unit 2 entered service in 1974. CPS Energy planning tables list Unit 2 at 410 MW of summer capacity.
  Source: OUR JANUARY 2021 FLEXIBLE PATH RESOURCE PLAN PUBLIC INFORMATION (https://www.cpsenergy.com/content/dam/corporate/en/Documents/CPS%20Energy%20January%202021%20Flexible%20Path%20Resource%20Plan.pdf)
- 2021-01-25 — Retirement planning milestone
  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.
  Source: OUR JANUARY 2021 FLEXIBLE PATH RESOURCE PLAN PUBLIC INFORMATION (https://www.cpsenergy.com/content/dam/corporate/en/Documents/CPS%20Energy%20January%202021%20Flexible%20Path%20Resource%20Plan.pdf)

## Sources

- [Filing Receipt - PUC Interchange - Texas.gov](https://interchange.puc.texas.gov/Documents/54308_18_1286518.PDF) — interchange.puc.texas.gov · tier regulatory
- [Energy Generation](https://www.cpsenergy.com/en/about-us/programs-services/energy-generation.html) — cpsenergy.com · tier other
- [Source](https://epa.gov/system/files/documents/2022-01/needs_v6_jan_2022_comment_and_change_log.xlsx) — epa.gov · tier regulatory
- [Plant Name](https://downloads.regulations.gov/EPA-R06-OAR-2014-0754-0008/attachment_108.pdf) — downloads.regulations.gov · tier regulatory
- [ERCOT Official Document](https://downloads.regulations.gov/FWS-R2-ES-2022-0162-18521/attachment_63.pdf) — downloads.regulations.gov · tier regulatory
- [Source](https://ercot.com/files/docs/2025/08/01/MORA_October2025.xlsx) — ercot.com · tier regulatory
- [Source](https://www.cpsenergy.com/content/dam/corporate/en/Documents/RAC/Customer%20Demand%20%26%20Generation%20Utilization%20R1.pdf) — cpsenergy.com · tier other
- [Interchange - Documents](https://interchange.puc.texas.gov/Search/Documents?controlNumber=54308&itemNumber=2) — interchange.puc.texas.gov · tier regulatory
- [Power plant profile: O W Sommers Power Plant, US](https://www.power-technology.com/marketdata/power-plant-profile-o-w-sommers-power-plant-us/) — power-technology.com · tier other
- [Steam Turbine Power Plant Solutions](https://www.gevernova.com/gas-power/products/steam-turbines) — gevernova.com · tier other
- [CPS Energy to retire aging gas units in 2025](https://www.power-eng.com/gas/turbines/cps-energy-to-retire-aging-gas-units-in-2025/) — power-eng.com · tier other
- [OUR JANUARY 2021 FLEXIBLE PATH RESOURCE PLAN PUBLIC INFORMATION](https://www.cpsenergy.com/content/dam/corporate/en/Documents/CPS%20Energy%20January%202021%20Flexible%20Path%20Resource%20Plan.pdf) — cpsenergy.com · tier other
- [SEPTEMBER-26-2022-BOARD-MEETING-FOR- ...](https://www.cpsenergy.com/content/dam/corporate/en/Documents/Trustees/SEPTEMBER-26-2022-BOARD-MEETING-FOR-POSTING.pdf) — cpsenergy.com · tier other
- [O W Sommers Power Plant, US](https://www.power-technology.com/marketdata/o-w-sommers-power-plant-us/) — power-technology.com · tier other
- [Welcome to CPS Energy](https://www.cpsenergy.com/) — cpsenergy.com · tier other
- [City of San Antonio: Home](https://www.sa.gov/Home) — sa.gov · tier regulatory
- [CEO Report for Board Meeting January 2021](https://www.cpsenergy.com/content/dam/corporate/en/Documents/Trustees/January%202021%20CEO%20Report%20v2.pdf) — cpsenergy.com · tier other
- [Br.](https://texashistory.unt.edu/ark:/67531/metapth614041/m2/1/high_res_d/TXPUB_00099.pdf) — texashistory.unt.edu · tier other
- [FY 2025 Basic Financial Statements](https://www.cpsenergy.com/content/dam/corporate/en/Documents/Finance/FY2025-CPS-Energy-YE-Audited-Financials-FINAL-042925-ada.pdf) — cpsenergy.com · tier other
- [Source](https://www.ercot.com/files/docs/2026/07/02/MORA_September2026.pdf) — ercot.com · tier regulatory
- [Interchange - Filings](https://interchange.puc.texas.gov/Search/Filings?ControlNumber=54308) — interchange.puc.texas.gov · tier regulatory

## Data quality

- The facility remained listed as operational as of August 2, 2026, while the 2021 resource plan and later portfolio plan describe future retirement targets rather than completed retirements. The plant-level record reports 892 MW of nameplate capacity and 830 MW of summer and winter capacity; unit planning tables separately report 420 MW for Unit 1 and 410 MW for Unit 2. No separate acquisition or sale transaction, buyer, seller, transaction month/year, project-financing amount, or repowering event is identified for O W Sommers. A $335,257,976.42 CPS Energy bond ordinance references the Calaveras Site/Sommers Power Station but does not allocate proceeds specifically to O W Sommers.

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Source: Ask the Grid — https://askthegrid.com/