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.
EIA-reported net summer capability; other nameplate and seasonal ratings may differ.
Primary generation technology.
Somervell County · ERCOT
Comanche Peak is operating.
ERCOT settlement point.
Unit 1; Unit 2 entered commercial operation August 3, 1993.
CPSES_UNIT1 · CPSES_UNIT2
EIA net summer capability
Westinghouse four-loop PWRs
Units 1 and 2
Vistra subsidiary
Similar plants ranked by technology, capacity, and distance.
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 |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
IAEA PRIS records December 19, 1974 as the construction start date for both units.
Units 1 and 2
Units 1 and 2
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
2 ERCOT market resources · Nuclear
Capacity factor is average output vs. this plant's observed peak.
Observed ERCOT settlement prices at CPSES_UNIT1 over 363 days (2025-09-12 to 2026-09-11). This plant is also crosswalked to CPSES_UNIT2; the point with the deepest price history is shown.
The TB2 figure is a price benchmark, not revenue: it values one perfect-foresight cycle per day between the 2 cheapest and 2 dearest hours of each day, gross of round-trip losses, and excludes ancillary services and any physical dispatch constraint. It describes what this node’s price shape was worth over the window — it is not this asset’s realized capture, and no dispatch is assumed or modelled.
| 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 portfolioEIA-860 lists generator 1 with this operating date.
Comanche Peak Unit 1 entered commercial operation.
EIA-860 lists generator 2 with this operating date.
Comanche Peak Unit 2 entered commercial operation.
Fluor announced a five-year contract covering engineering, maintenance and modifications, and facility services.
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 Amazon Web Services as the customer under the previously announced 1,200 MW agreement; this was a customer disclosure, not a second PPA.
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Comanche Peak has a reported capacity of 2,430 MW. Source: EIA Form 860.
Comanche Peak is a nuclear facility in Somervell County, TX, participating in the ERCOT market.
Comanche Peak is in Somervell County, TX, inside the ERCOT balancing area.
Comanche Peak is operated by Luminant Generation Company LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Comanche Peak reported 20,024.4 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
Comanche Peak settles at CPSES_UNIT1.
By capacity, Comanche Peak ranks #13 of 54 operating plants of the same technology nationally. It ranks #2 of 2 in TX.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
