Rio Nogales Power Project
Natural gas power plant in Guadalupe County, Texas. 1,108 MW of nameplate capacity across 4 generators, operated by City of San Antonio - (TX).
Also known as EIA plant 55137
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Key facts
- Capacity
- 1,108 MWNameplate
- Generators
- 4 operatingEIA-860M, August 2026
- Operating since
- May 2002First generator online
- Operator
- City of San Antonio - (TX)EIA operator ID 16604
- Grid
- ERCOTBalancing authority ERCO
- Price nodes
- None linkedNo verified ISO node
- Location
- Guadalupe County, TX29.5931, −97.9732
- EIA plant ID
- 55137EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Rio Nogales Power Project produces
Free · EIA-923Net generation, 2025
4.14 TWh
4,144,257 MWh, final
Capacity factor, 2025
Not reported
2024: Not reported
January to July 2026
3.25 TWh
Provisional
Range, 2015 to 2025
2.5–5.0
TWh a year. Low 2017, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | 1,258,785 | Not reported | 12 of 12 |
| 2003 | 1,227,424 | Not reported | 12 of 12 |
| 2004 | 1,453,068 | Not reported | 12 of 12 |
| 2005 | 3,160,572 | Not reported | 12 of 12 |
| 2006 | 3,902,576 | Not reported | 12 of 12 |
| 2007 | 2,574,914 | Not reported | 12 of 12 |
| 2008 | 2,813,204 | Not reported | 12 of 12 |
| 2009 | 2,323,690 | Not reported | 12 of 12 |
| 2010 | 2,127,241 | 27.0% | 12 of 12 |
| 2011 | 2,686,209 | 34.1% | 12 of 12 |
| 2012 | 2,755,731 | 34.9% | 12 of 12 |
| 2013 | 2,344,388 | Not reported | 12 of 12 |
| 2014 | 3,022,355 | 36.7% | 12 of 12 |
| 2015 | 3,352,868 | 40.7% | 12 of 12 |
| 2016 | 3,079,186 | 37.3% | 12 of 12 |
| 2017 | 2,474,959 | 30.0% | 12 of 12 |
| 2018 | 3,115,812 | 37.8% | 12 of 12 |
| 2019 | 4,082,241 | Not reported | 12 of 12 |
| 2020 | 4,103,375 | Not reported | 12 of 12 |
| 2021 | 4,063,560 | 49.3% | 12 of 12 |
| 2022 | 4,529,681 | 55.0% | 12 of 12 |
| 2023 | 4,376,965 | Not reported | 12 of 12 |
| 2024 | 5,029,298 | Not reported | 12 of 12 |
| 2025 | 4,144,257 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | 3,246,561 | Not reported | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
1.72M
US short tons. 2024: 2.09M
SO₂, 2025
9
US short tons
NOx, 2025
268
US short tons
CO₂ per MWh, calculated
0.41 t
About 829 lb per MWh
3 of 3 EPA units reported CO₂ in 2025 (CTG-1, CTG-2, CTG-3), matched to EIA plant 55137 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
1,254
million gallons
Consumption, 2024
1,024
million gallons
Source
Municipal
Other, Other. Induced-draft tower
Watershed stress
Very low/none · 0.154
USGS SUI, HUC12 Youngs Creek-Guadalupe River
12 of 12 cooling months report withdrawal. SUI of the HUC12 containing the plant. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | 223.5 | May 2002 |
| CTG2 | Natural Gas Fired Combined Cycle | 222.0 | May 2002 |
| CTG3 | Natural Gas Fired Combined Cycle | 223.5 | May 2002 |
| STG1 | Natural Gas Fired Combined Cycle | 439.0 | May 2002 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists City of San Antonio - (TX) as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Rio Nogales Power Project
More plants operated by City of San Antonio - (TX)
Questions about Rio Nogales Power Project
How much power does Rio Nogales Power Project produce?
Rio Nogales Power Project reported 4,144,257 MWh (4.14 TWh) of net generation in 2025. From January to July 2026 it reported 3.25 TWh, which is provisional.
Where is Rio Nogales Power Project?
Rio Nogales Power Project is in Guadalupe County, Texas, at 29.5931, −97.9732. It is in the Electric Reliability Council of Texas, Inc. balancing area (ERCO).
Who operates Rio Nogales Power Project?
EIA-860M for August 2026 lists City of San Antonio - (TX) as the operator (EIA operator ID 16604). The operator is not always the owner.
When did Rio Nogales Power Project start operating?
Its first generator began operating in May 2002, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page