Guadalupe Generating Station
Calpine / Constellation · Guadalupe County · ERCOT
Guadalupe Generating Station is a two-block natural-gas combined-cycle plant near Marion in Guadalupe County, Texas. EIA's May 2026 inventory lists four combustion turbines and two steam turbines with 1,088.2 MW of nameplate capacity, 1,005 MW of net summer capability, and 1,042 MW of net winter capability. Guadalupe Power Partners, LP owns and operates the station, which participates in ERCOT through combined-cycle resources GUADG_CC1 and GUADG_CC2. Calpine acquired the plant for approximately $625 million in February 2014; Calpine became part of Constellation in January 2026.
Overview
Key fields
- Net summer capacity
- 1,005 MW
EIA May 2026
- Nameplate capacity
- 1,088.2 MW
Four combustion turbines and two steam turbines
- 12-month generation
- 5.24 TWh
May 2025–Apr 2026 · EIA Form 923
- Capacity factor
- 59.57%
Against EIA net summer capability
- ERCOT resources
- 2 resources
GUADG_CC1 · GUADG_CC2
- Registry anchor
- Plant 55153
Guadalupe Power Partners, LP · ERCOT
Resource stack
- 8 resources
GUADG_CC1_1 · GUADG_CC1_2
Profile
- Plant configuration
- Two 2×1 combined-cycle blocks: four GE Frame 7FA combustion turbines, four Aalborg heat-recovery steam generators, and two GE steam turbines.
- ERCOT registration
- Combined-cycle resources GUADG_CC1 and GUADG_CC2; the historical mapping also identifies component units GUADG_GAS1–4 and GUADG_STM5–6.
- Operating profile
- Constellation classifies the six-unit plant as intermediate-dispatch generation; EIA reports a 59.57% capacity factor for the latest twelve-month window.
Structured profile
- Owner / operator
- Guadalupe Power Partners, LP
Calpine / Constellation corporate chain
- Configuration
- Two 2×1 blocks
Four CTs · four HRSGs · two STs
- 2014 acquisition
- $625 million
Calpine purchase from MinnTex Power Holdings
- TCEQ entity
- RN100225820
Federal Operating Permit O2071
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| CTG1 | 171.1 MW 153 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Oct 2000 | Operating |
| CTG2 | 171.1 MW 153 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Oct 2000 | Operating |
| CTG3 | 171.1 MW 153 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Dec 2000 | Operating |
| CTG4 | 171.1 MW 153 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Dec 2000 | Operating |
| STG1 | 201.9 MW 196 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CA | Oct 2000 | Operating |
| STG2 | 201.9 MW 197 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CA | Oct 2000 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 1,088.2 MW
- National rank
- #82
- TX rank
- #10
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
8 ERCOT market resources · Combined-cycle gas
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 |
|---|---|---|
| Market resources | GUADG_CC1_1, GUADG_CC1_2, GUADG_CC1_3, GUADG_CC1_4, GUADG_CC2_1 | 8 linked ERCOT resources. |
| Grid selection | plant:plant-55153 | Canonical asset page /ercot/assets/plant/guadalupe-generating-station. |
Reporting portfolio
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
Timeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- First combined-cycle block entered serviceEIA May 202...
EIA reports October 2000 operating dates for CTG1, CTG2, STG1, and STG2; CTG3 and CTG4 followed in December.
- Remaining combustion turbines entered serviceEIA May 202...
EIA reports December 2000 operating dates for CTG3 and CTG4.
- Calpine Acquisition CompletedCalpine acq...
Calpine Guadalupe GP acquired the station from MinnTex Power Holdings for approximately $625 million, excluding working-capital adjustments.
- Latest disclosed generation interval
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Sources
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