Guadalupe Generating Station
CalpineGuadalupe County
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.
Mapped infrastructure geometry associated with this asset.
Calpine / Constellation corporate chain
Four CTs · four HRSGs · two STs
Calpine purchase from MinnTex Power Holdings
Federal Operating Permit O2071
EIA plant 55153 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | Operating | 171.1 | Unknown |
| CTG2 | Natural Gas Fired Combined Cycle | Operating | 171.1 | Unknown |
| CTG3 | Natural Gas Fired Combined Cycle | Operating | 171.1 | Unknown |
| CTG4 | Natural Gas Fired Combined Cycle | Operating | 171.1 |
Similar plants ranked by technology, capacity, and distance.
Current 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 CT | Oct 2000 | Operating |
| CTG2 | 171.1 MW 153 MW summer | Natural Gas Fired Combined Cycle CT | Oct 2000 | Operating |
| CTG3 | 171.1 MW 153 MW summer | Natural Gas Fired Combined Cycle CT | Dec 2000 | Operating |
| CTG4 | 171.1 MW 153 MW summer | Natural Gas Fired Combined Cycle CT | Dec 2000 | Operating |
| STG1 | 201.9 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.
EIA reports October 2000 operating dates for CTG1, CTG2, STG1, and STG2; CTG3 and CTG4 followed in December.
| Unknown |
| STG1 | Natural Gas Fired Combined Cycle | Operating | 201.9 | Unknown |
|---|
| STG2 | Natural Gas Fired Combined Cycle | Operating | 201.9 | Unknown |
|---|
| CTGP1 | Natural Gas Fired Combustion Turbine | canceled_or_postponed | 160 | Unknown |
|---|
| CTGP2 | Natural Gas Fired Combustion Turbine | canceled_or_postponed | 160 | Unknown |
|---|
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
8 ERCOT market resources · Combined-cycle gas
Capacity factor is average output vs. this plant's observed peak.
Observed ERCOT settlement prices at GUADG_CC1 over 365 days (2025-10-26 to 2026-10-25). This plant is also crosswalked to GUADG_CC2, GUADG_CCU1, GUADG_CCU2; 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.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
EIA reports December 2000 operating dates for CTG3 and CTG4.
Calpine Guadalupe GP acquired the station from MinnTex Power Holdings for approximately $625 million, excluding working-capital adjustments.
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.
Guadalupe Generating Station reports 1,088.2 MW natural gas of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
Guadalupe Generating Station is a Natural Gas Fired Combined Cycle facility in Guadalupe County, TX, participating in the ERCOT market.
Guadalupe Generating Station is in Guadalupe County, TX, inside the ERCOT balancing area.
Guadalupe Generating Station is operated by Guadalupe Power Partners LP according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Guadalupe Generating Station reported 5,306.1 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.
Guadalupe Generating Station settles at GUADG_CC1, interconnects at Guadalupe Generating.
By capacity, Guadalupe Generating Station ranks #83 of 540 operating plants of the same technology nationally. It ranks #11 of 68 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.
