Comanche Peak
Luminant · Somervell County · ERCOT
Comanche Peak is a two-unit nuclear power plant in Somervell County, Texas, with 2,400 MW of EIA-reported net summer capability. Its Westinghouse four-loop pressurized-water reactors entered commercial service in 1990 and 1993 and map to ERCOT resources CPSES_UNIT1 and CPSES_UNIT2.
Overview
Key fields
- Reported capacity
- 2,400 MW
EIA-reported net summer capability; other nameplate and seasonal ratings may differ.
- Technology
- Nuclear
Primary generation technology.
- Registry anchor
- Plant 6145
Somervell County · ERCOT
- Operating status
- Operating
Comanche Peak is operating.
- Settlement point
- CPSES_UNIT1
ERCOT settlement point.
- Commercial operation
- August 13, 1990
Unit 1; Unit 2 entered commercial operation August 3, 1993.
- Resource stack
- 2 resources
CPSES_UNIT1 · CPSES_UNIT2
Profile
- Operating configuration
- Two Westinghouse four-loop pressurized-water reactors, each licensed at 3,612 MW thermal. IAEA PRIS reports 1,205 MW net reference power for Unit 1 and 1,195 MW for Unit 2.
- ERCOT resources
- CPSES_UNIT1 and CPSES_UNIT2.
- License terms
- Unit 1 expires February 8, 2050; Unit 2 expires February 2, 2053.
Structured profile
- Reported capacity
- 2,400 MW
EIA net summer capability
- Reactors
- 2 operating units
Westinghouse four-loop PWRs
- Commercial operation
- 1990 / 1993
Units 1 and 2
- Owner
- Luminant Generation Company LLC
Vistra subsidiary
- NRC operator
- Vistra Operations Company LLC
Units 1 and 2
- License expiration
- 2050 / 2053
Units 1 and 2
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 1,215 MW 1,205 MW summer | Nuclear Nuclear · ST | Aug 1990 | Operating |
| 2 | 1,215 MW 1,195 MW summer | Nuclear Nuclear · ST | Apr 1993 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 2,430 MW
- National rank
- #13
- TX rank
- #2
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
2 ERCOT market resources · Nuclear
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 recordsNearby 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.
Relationship graph
Drag organizations to explore the network. Select a node to pin its details and available page link.
Parties and identifiers
| Relationship | Entity | Basis |
|---|---|---|
| Operator | Operator for Comanche Peak | |
| Market resources | CPSES_UNIT1, CPSES_UNIT2 | Linked ERCOT resources. |
| Grid selection | plant:plant-6145 | Canonical asset page /ercot/assets/plant/comanche-peak. |
Reporting portfolio
| Largest reported plants | Capacity | State |
|---|---|---|
| Comanche PeakCurrent | 2,430 MW | TX |
| Martin Lake | 2,379.6 MW | TX |
| Oak Grove (TX) | 1,795.4 MW | TX |
| Lake Hubbard | 927.5 MW | TX |
| Stryker Creek | 713.4 MW | TX |
| Graham | 634.7 MW | TX |
| DeCordova Steam Electric Station | 626.7 MW | TX |
| Morgan Creek | 536.4 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
- Construction StartedIAEA PRIS: ...
IAEA PRIS records December 19, 1974 as the construction start date for both units.
- Generator enters operationEIA-860
EIA-860 lists generator 1 with this operating date.
- Unit 1 commercial operationIAEA PRIS: ...
Comanche Peak Unit 1 entered commercial operation.
- Generator enters operationEIA-860
EIA-860 lists generator 2 with this operating date.
- Unit 2 commercial operationIAEA PRIS: ...
Comanche Peak Unit 2 entered commercial operation.
- Fluor maintenance contract announcedFluor maint...
Fluor announced a five-year contract covering engineering, maintenance and modifications, and facility services.
- 1,200 MW power agreement announcedVistra Corp...
Vistra announced a 20-year agreement for 1,200 MW from Comanche Peak. Delivery is expected to begin in the fourth quarter of 2027 and ramp to full capacity by 2032; the filing did not initially name the customer.
- Vistra identified AWS as the power customerVistra 2025...
Vistra identified Amazon Web Services as the customer under the previously announced 1,200 MW agreement; this was a customer disclosure, not a second PPA.
- Latest disclosed generation interval
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Sources
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