How big is Topaz Generating?

Topaz Generating has a reported capacity of 605 MW. Source: EIA Form 860.

What kind of plant is Topaz Generating?

Topaz Generating is a Natural Gas Fired Combustion Turbine facility in Galveston County, TX, participating in the ERCOT market.

Where is Topaz Generating located?

Topaz Generating is in Galveston County, TX, inside the ERCOT balancing area.

Who operates Topaz Generating?

Topaz Generating 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 Topaz Generating generate?

Topaz Generating reported 550.1 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.

How does Topaz Generating compare to other plants?

By capacity, Topaz Generating ranks #61 of 825 operating plants of the same technology nationally. It ranks #1 of 75 in TX.

Topaz Generating — 605 MW gas plant, Galveston County, TX

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Topaz Generating — 605 MW gas plant, Galveston County, TX · Ask the Grid

Overview

Net summer capacity: 445 MW
EIA May 2026
Nameplate capacity: 605 MW
EIA May 2026
Net winter capacity: 498 MW
EIA May 2026
Company rating: 480 MW
CPS Energy
Operating generators: 10
Simple-cycle peaking turbines
Registry anchor: Plant 63688
City of San Antonio
Resource stack: 10 resources
TOPAZ_UNIT1 · TOPAZ_UNIT10

Infrastructure record

Operator: City of San Antonio - (TX)

Profile

Grid role: Ten fast-start simple-cycle natural-gas peaking turbines in ERCOT's Houston Zone.
Operating configuration: Ten EIA generator records at 60.5 MW nameplate each.
Capacity scope: EIA reports 605 MW nameplate, 445 MW net summer, and 498 MW net winter capability; CPS uses a 480 MW company rating.
Current ownership and operation: CPS Energy acquired Topaz in September 2025; PROENERGY continues staffing and O&M services.

Structured profile

Net summer capacity: 445 MW
EIA May 2026
Nameplate capacity: 605 MW
EIA May 2026
Current owner: CPS Energy
Acquired September 2025
O&M provider: PROENERGY
Post-sale services
Company rating

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Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
CTG-1	60.5 MW 44.5 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jul 2021	Operating
CTG-2	60.5 MW 44.5 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jul 2021	Operating
CTG-3	60.5 MW 44.5 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jul 2021	Operating
CTG-4	60.5 MW 44.5 MW summer

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 605 MW
National rank: #61
TX rank: #1

Monthly generation

Download CSV

Latest 12 months

550.1 GWh

Reported net generation

Latest report

Jun 2026

EIA-923 monthly filing

2025 capacity factor

11.3%

Using current reported nameplate capacity

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Market registration

ERCOT public disclosures

Settlement point

TOPAZ_ALL

high confidence spatial and capacity match

Market resources

10 resources

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. 155736

TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE

TCEQ AIR NEW SOURCE PERMITS: 155736

Air Permit

Permit No. 4289

TCEQ AIR OPERATING PERMITS; PERMIT; status ACTIVE

TCEQ AIR OPERATING PERMITS: 4289

Air Permit

Permit No. 4345

TCEQ AIR OPERATING PERMITS; PERMIT; status ACTIVE

TCEQ AIR OPERATING PERMITS: 4345

Coordinate Parcel Area

2025

21.7188 Acres

TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 735552; GALVESTON APPRAISAL DISTRICT; tax year 2025

TxGIO land parcel intersecting

Coordinate Parcel Id

2025

735552

TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 735552; GALVESTON APPRAISAL DISTRICT; tax year 2025

TxGIO land parcel intersecting

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.

Parties and identifiers

OrganizationRoleBasis

TOPAZ_UNIT1, TOPAZ_UNIT10, TOPAZ_UNIT2, TOPAZ_UNIT3, TOPAZ_UNIT4Market resources10 linked ERCOT resources.

plant:plant-63688Grid selectionCanonical asset page /assets/facilities/topaz-generating.

Reporting portfolio

EIA reporting entity

City of San Antonio - (TX)

Entity 16604

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Jul 2021
Jul 2021
First seven turbines entered serviceEIA May 202...
EIA reports July 2021 for CTG-1 through CTG-7.
Aug 2021
Aug 2021
Generators enter operation

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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 Sommers	892 MW	TX
Nueces Bay	730.2 MW	TX
Topaz GeneratingCurrent	605 MW	TX
Arthur Von Rosenberg	575 MW	TX

Overview

Infrastructure record

Profile

Structured profile

Related assets

Green Power 2

Sweeny Cogen Facility

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Market registration

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

Parties and identifiers

Reporting portfolio

Timeline and sources

Project timeline

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ERCOT disclosed dispatch

Generation

Output by hourlocal time · 90 days through Jul 13, 2026

Latest disclosed outputhourly · 2 weeks ending Jul 13, 2026

Settlement price economics

Operating context

Interconnection record

Nearby substations

Sources

Common questions about Topaz Generating

How big is Topaz Generating?

What kind of plant is Topaz Generating?

Where is Topaz Generating located?

Who operates Topaz Generating?

How much electricity does Topaz Generating generate?

How does Topaz Generating compare to other plants?

Co-located assets