Guadalupe County · ERCOT
Rio Nogales Power Project is a natural gas-fired power facility with 1,108 MW of EIA-reported nameplate capacity in Guadalupe County, Texas, registered as EIA Plant ID 55137. City of San Antonio - (TX) is the registered plant entity or operator. ERCOT identifies four associated thermal resources: three combustion-turbine resources and one steam-turbine resource.
Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
City of San Antonio - (TX) · Guadalupe County · ERCOT
345 kV · Lower Colorado River Authority (LCRA)
RIONOG_CC1_1 · RIONOG_CC1_2
Mapped infrastructure geometry associated with this asset.
Natural Gas Fired Combined Cycle
Rio Nogales Power Project is currently operating; a closure or retirement is listed for Approximately 2034-2037 for the affected combustion-turbine units; no exact cessation date is stated.
Rio Nogales Power Project is currently operating; a closure or retirement is listed for Approximately 2034-2037 for the affected combustion-turbine units; no exact cessation date is stated.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| CTG1 | 189 MW 165.5 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | May 2002 | Operating |
| CTG2 | 189 MW 160 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | May 2002 | Operating |
| CTG3 | 189 MW 165.5 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | May 2002 | Operating |
| STG1 | 373.2 MW |
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.
The plant was reported as opening two years after groundbreaking, implying construction began around 2000.
345 kV · Lower Colorado River Authority (LCRA)
ERCOT
ERCOT · Guadalupe County
Natural Gas Fired Combined Cycle Natural Gas · CA |
| May 2002 |
| Operating |
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
4 ERCOT market resources · Combined-cycle gas
Capacity factor is average output vs. this plant's observed peak.
Observed ERCOT settlement prices at RIONOG_CC1 over 364 days (2025-08-04 to 2026-08-03).
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 | |
|---|---|---|---|
| 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 ProjectCurrent | 940.2 MW | TX | |
| O W Sommers | 892 MW | TX | |
| Nueces Bay | 730.2 MW | TX | |
| Topaz Generating | 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 portfolioEIA-860 lists generator CTG1, generator CTG2, generator CTG3, generator STG1 with this operating date.
Contemporaneous coverage reported that the power plant started operations in June 2002.
Constellation Energy Group officially opened the $200 million Rio Nogales Power Project in Seguin as an 800 MW natural-gas-fired facility.
CPS Energy announced an agreement to purchase the existing plant from a Tenaska Capital Management affiliate.
CPS Energy's resource plan listed Rio Nogales with a 2002 in-service year and a technical life extending through 2047, with no retirement date shown.
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.
Rio Nogales Power Project has a reported capacity of 1,108 MW. Source: EIA Form 860.
Rio Nogales Power Project is a Natural Gas Fired Combined Cycle facility in Guadalupe County, TX, participating in the ERCOT market.
Rio Nogales Power Project is in Guadalupe County, TX, inside the ERCOT balancing area.
Rio Nogales Power Project is operated by City of San Antonio - (TX) according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Rio Nogales Power Project reported 4,800.8 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.
Rio Nogales Power Project interconnects at Rio Nogales Switchyard, on the Lower Colorado River Authority (LCRA) system.
By capacity, Rio Nogales Power Project ranks #102 of 538 operating plants of the same technology nationally. It ranks #14 of 69 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.
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