Rio Nogales Power Project
Guadalupe County
Overview
- Reported capacity
- 1,108 MW
- EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
- Technology
- Natural Gas Fired Combined Cycle
- Primary generation technology.
- Registry anchor
- Plant 55137
- City of San Antonio - (TX) · Guadalupe County · ERCOT
- Operating status
- Operating
- Grid connection
- Rio Nogales Switchyard
- 345 kV · Lower Colorado River Authority (LCRA)
Infrastructure record
- Mapped facility footprint
- Mapped infrastructure footprint
Mapped infrastructure geometry associated with this asset.
- In service
- 2002-05
Profile
- Operating status
- 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.
- Grid role
- South-zone, dispatchable combined-cycle gas generation used in CPS Energy's portfolio to replace the energy output of the retired J. T. Deely coal plant.
- Grid connection
- Rio Nogales Switchyard · 345 kV · Lower Colorado River Authority (LCRA).
- Context
- plants and #25 in Texas by capacity. ERCOT identifies four associated thermal resources: three combustion-turbine resources and one steam-turbine resource.
Structured profile
- Reported capacity
- 1,108 MW
Natural Gas Fired Combined Cycle
- Operating status
- operating
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.
- Retirement
- 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.
- Interconnection
- Rio Nogales Switchyard
345 kV · Lower Colorado River Authority (LCRA)
Generation and physical site
EIA plant 55137 · Inventory for Sep 2026.
Reported operating nameplate by technology
- Natural gas
- 1,108 MW
Generator records (4)
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | Operating | 223.5 | Unknown |
| CTG2 | Natural Gas Fired Combined Cycle | Operating | 222 | Unknown |
| CTG3 | Natural Gas Fired Combined Cycle | Operating | 223.5 | Unknown |
| STG1 | Natural Gas Fired Combined Cycle | Operating | 439 | Unknown |
- Physical map location · OpenStreetMap
Related assets
Similar plants ranked by technology, capacity, and distance.
Units and generators
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| CTG1 | 223.5 MW 165.5 MW summer | Natural Gas Fired Combined Cycle CT | May 2002 | Operating |
| CTG2 | 222 MW 165.5 MW summer | Natural Gas Fired Combined Cycle CT | May 2002 | Operating |
| CTG3 | 223.5 MW 165.5 MW summer | Natural Gas Fired Combined Cycle CT | May 2002 | Operating |
| STG1 | 439 MW 303 MW summer | Natural Gas Fired Combined Cycle CA | May 2002 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 1,108 MW
- Natural Gas Fired Combined Cycle
- National rank
- #78
- of 540 operating peers
- TX rank
- #10
- of 68 operating peers
Monthly generation
Download CSVLatest 12 months
4.61 TWh
Reported net generation
Latest report
Jul 2026
EIA-923 monthly filing
2025 capacity factor
42.7%
Using current reported nameplate capacity
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 disclosuresSettlement point
Commercial, 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
Acid Rain Permit
Mar 14, 2002
Acid Rain Permit 2438
TCEQ's 2002 operating-permits agenda lists Rio Nogales Power Project LP as receiving new effective Acid Rain Permit 2438, signed March 14, 2002.
Air Permit
Permit No. 116561
TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE
Air Permit
Permit No. 153251
TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE
Air Permit
Permit No. 171272
TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE
Air Permit
Permit No. 174192
TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE
Air Permit
Permit No. 176077
TCEQ AIR NEW SOURCE PERMITS; REGISTRATION; status ACTIVE
Air Permit
Permit No. 2064
TCEQ AIR OPERATING PERMITS; PERMIT; status ACTIVE
Air Permit
Permit No. 40867
TCEQ AIR NEW SOURCE PERMITS; PERMIT; status ACTIVE
Air Permit
Permit No. PSDTX938
TCEQ AIR NEW SOURCE PERMITS; EPA PERMIT; status ACTIVE
CAIR Record
Feb 2, 2009
Content ID 7539641; Record Number 1800803; TCEQ AIN 223
TCEQ Clean Air Interstate Rule (CAIR) application for RIO NOGALES POWER PROJECT with February 2, 2009 record date.
Coordinate Parcel Area
2025
52.515 Acres
TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 109900; GUADALUPE APPRAISAL DISTRICT; tax year 2025
Coordinate Parcel Id
2025
109900
TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 109900; GUADALUPE APPRAISAL DISTRICT; tax year 2025
Coordinate Parcel Market Value
2025
1642603
TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 109900; GUADALUPE APPRAISAL DISTRICT; tax year 2025
Coordinate Parcel Owner
2025
CITY OF SAN ANTONIO
TxGIO parcel intersecting the mapped EIA plant coordinate; parcel 109900; GUADALUPE APPRAISAL DISTRICT; tax year 2025
Potable Water Rate
Oct 1, 2015
$2.98 per 1,000 gallons
Tenth amendment to Water Supply and Wastewater Requirements Agreement set potable-water quantity charge at $2.98 per 1,000 gallons effective October 1, 2015.
Site Address
711 Rio Nogales Dr., Seguin, Guadalupe County, Texas 78155-2501
County-posted TCEQ notice identifies this as the location of the Rio Nogales Power Station; linked to Federal Operating Permit O2064.
Waste Registration
86144
TCEQ INDUSTRIAL AND HAZARDOUS WASTE; SOLID WASTE REGISTRATION # (SWR); status ACTIVE
Wastewater Destination
Geronimo Creek Wastewater Treatment Plant
Rio Nogales Power Plant discharge flows to Geronimo Creek Wastewater Treatment Plant for treatment. Discharge has high mineral concentration, so not sent to Walnut Branch plant.
Wastewater Reuse
City of Seguin treated wastewater effluent reused for power generation
City of Seguin water-conservation ordinance states that portion of wastewater effluent is pumped to Rio Nogales Power Plant as reuse water for electric generation.
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.
AssetOwner / operatorProject company
Timeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- Groundbreaking And ConstructionRio Nogales...
The plant was reported as opening two years after groundbreaking, implying construction began around 2000.