Topaz Generating
CPS Energy · Galveston County · ERCOT
Topaz Generating is a ten-unit simple-cycle natural-gas peaking plant in Galveston County, Texas. EIA's May 2026 inventory reports 605 MW nameplate, 445 MW net summer, and 498 MW net winter capability. Seven units entered service in July 2021 and three in July through September 2021. CPS Energy acquired Topaz from PROENERGY in September 2025 as part of a four-plant, 1,632 MW portfolio transaction; CPS reports a 480 MW company rating for Topaz and PROENERGY continues plant staffing and operations-and-maintenance services.
Overview
Key fields
- 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
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
- 480 MW
CPS Energy
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 | Natural Gas Fired Combustion Turbine Natural Gas · GT | Jul 2021 | Operating |
| CTG-5 | 60.5 MW 44.5 MW summer | Natural Gas Fired Combustion Turbine Natural Gas · GT | Jul 2021 | Operating |
| CTG-6 | 60.5 MW 44.5 MW summer | Natural Gas Fired Combustion Turbine Natural Gas · GT | Jul 2021 | Operating |
| CTG-7 | 60.5 MW 44.5 MW summer | Natural Gas Fired Combustion Turbine Natural Gas · GT | Jul 2021 | Operating |
| CTG-8 | 60.5 MW 44.5 MW summer | Natural Gas Fired Combustion Turbine Natural Gas · GT | Aug 2021 | Operating |
| CTG-9 | 60.5 MW 44.5 MW summer | Natural Gas Fired Combustion Turbine Natural Gas · GT | Oct 2021 | Operating |
| CTG10 | 60.5 MW 44.5 MW summer | Natural Gas Fired Combustion Turbine Natural Gas · GT | Aug 2021 | Operating |
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 CSVMonthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
ERCOT disclosed dispatch
10 ERCOT market resources · Gas turbine
Generation
3 mo through May 22, 2026Capacity factor is average output vs. this plant's observed peak.
Output by hourlocal time · 90 days through May 22, 2026
Latest disclosed outputhourly · 2 weeks ending May 22, 2026
Generation from ERCOT's 60-Day SCED Disclosure (≈60-day lag), summed over this site's market resources.
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 disclosuresOperating context
ERCOT market recordsInterconnection record
ERCOT GIS ReportMatched to the latest available ERCOT generation-interconnection queue record. Queue status and completion dates describe the queue record; operating status is verified separately against plant and market registrations.
Nearby substations
HIFLD infrastructure inventoryCommercial, 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
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
| Relationship | Entity | Basis |
|---|---|---|
| Market resources | TOPAZ_UNIT1, TOPAZ_UNIT10, TOPAZ_UNIT2, TOPAZ_UNIT3, TOPAZ_UNIT4 | 10 linked ERCOT resources. |
| Grid selection | plant:plant-63688 | Canonical asset page /ercot/assets/plant/topaz-generating. |
Reporting 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 Sommers | 892 MW | TX |
| Nueces Bay | 730.2 MW | TX |
| Topaz GeneratingCurrent | 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 portfolioTimeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- First seven turbines entered serviceEIA May 202...
EIA reports July 2021 for CTG-1 through CTG-7.
- Generators enter operationEIA-860
EIA-860 lists generator CTG-8, generator CTG10 with this operating date.
- Final listed turbine entered serviceEIA May 202...
EIA reports October 2021 for CTG-9.
- CPS Energy acquired TopazPROENERGY T...
Topaz closed as part of CPS Energy's four-plant 1,632 MW acquisition from PROENERGY.
- Latest disclosed generation interval
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Sources
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