How big is O W Sommers?

O W Sommers has a reported capacity of 892 MW. Source: EIA Form 860.

What kind of plant is O W Sommers?

O W Sommers is a Natural Gas Steam Turbine facility in Bexar County, TX, participating in the ERCOT market.

Where is O W Sommers located?

O W Sommers is in Bexar County, TX, inside the ERCOT balancing area.

Who operates O W Sommers?

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.

How much electricity does O W Sommers generate?

O W Sommers reported 2,531.7 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.

Where does O W Sommers connect to the grid?

O W Sommers settles at CALAVER_OWS1, on the CPS Energy system.

How does O W Sommers compare to other plants?

By capacity, O W Sommers ranks #33 of 257 operating plants of the same technology nationally. It ranks #8 of 32 in TX.

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Natural Gas Steam TurbineERCOT · Bexar County

O W Sommers

CPS Energy · Bexar County · ERCOT

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.

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Overview

Key fields

Reported capacity: 892 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Steam Turbine
Primary generation technology.
Registry anchor: Plant 3611
City of San Antonio - (TX) · Bexar County · ERCOT
Operating status: Operating

Asset analyst

plant:plant-3611

Ask about O W Sommers

Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.

Units and generators

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

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Land and environmental record

Air Permit

Permit No. 101006

TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE

TCEQ AIR NEW SOURCE PERMITS: 101006

Air Permit

Permit No. 136922

TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE

TCEQ AIR NEW SOURCE PERMITS: 136922

Air Permit

Permit No. 137903

TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE

TCEQ AIR NEW SOURCE PERMITS: 137903

Air Permit

Permit No. 163465

TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE

TCEQ AIR NEW SOURCE PERMITS: 163465

Air Permit

Permit No. 1652

TCEQ AIR NEW SOURCE PERMITS; PERMIT; status ACTIVE

TCEQ AIR NEW SOURCE PERMITS: 1652

Mapped facility footprint

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

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AssetOwner / operator

Parties and identifiers

OrganizationRoleBasis

CALAVERS_OWS1, CALAVERS_OWS2Market resourcesLinked ERCOT resources.

plant:plant-3611Grid selectionCanonical asset page /assets/facilities/o-w-sommers.

Reporting portfolio

EIA reporting entity

City of San Antonio - (TX)

Entity 16604

Operating portfolio

16 plants

1 states

Reported capacity

9,412.3 MW

Batteries · Conventional Steam Coal · Natural Gas Fired Combined Cycle

Largest reported plants in this portfolio
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

Overview

Key fields

Ask about O W Sommers

Overview

Key fields

Ask about O W Sommers

Infrastructure record

Profile

Structured profile

Units and generators

Performance

Peer context

Monthly generation

ERCOT disclosed dispatch

Generation

Output by hourlocal time · 90 days through Jun 4, 2026

Latest disclosed outputhourly · 2 weeks ending Jun 4, 2026

Settlement price economics

Grid and market context

Market registration

Operating context

Nearby substations

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

Relationship graph

Parties and identifiers

Reporting portfolio

Timeline and sources

Project timeline

Sources

Common questions about O W Sommers

How big is O W Sommers?

What kind of plant is O W Sommers?

Where is O W Sommers located?

Who operates O W Sommers?

How much electricity does O W Sommers generate?

Where does O W Sommers connect to the grid?

How does O W Sommers compare to other plants?

Co-located assets

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