Thomas C Ferguson
City of San MarcosLlano County
Thomas C Ferguson is a natural gas-fired power facility with 574.6 MW of EIA-reported nameplate capacity in Llano County, Texas, registered as EIA Plant ID 4937. City of San Marcos Electric Utility is the current owner; Lower Colorado River Authority is the registered plant entity or operator. The Ferguson Replacement Project was the first power plant issued a greenhouse-gas permit by the U.S. Environmental Protection Agency under the federal rules cited by Fluor; LCRA describes the permit as the first in Texas under those rules.
Mapped infrastructure geometry associated with this asset.
Natural Gas Fired Combined Cycle
Thomas C Ferguson is operating.
345 kV · LCRA-TSP
ERCOT
EIA plant 4937 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| CT-1 | Natural Gas Fired Combined Cycle | Operating | 185.3 | Unknown |
| CT-2 | Natural Gas Fired Combined Cycle | Operating | 185.3 | Unknown |
| STG | Natural Gas Fired Combined Cycle | Operating | 204 | Unknown |
| 1 | Natural Gas Steam Turbine | Retired | 446 | Unknown |
Similar plants ranked by technology, capacity, and distance.
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| CT-1 | 185.3 MW 168 MW summer | Natural Gas Fired Combined Cycle CT | Aug 2014 | Operating |
| CT-2 | 185.3 MW 168 MW summer | Natural Gas Fired Combined Cycle CT | Aug 2014 | Operating |
| STG | 204 MW 180 MW summer | Natural Gas Fired Combined Cycle CA | Aug 2014 | Operating |
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.
Drag organizations to explore the network. Select a node to pin its details and available page link.
Project milestones and public references behind the asset profile.
The original 420-MW Thomas C. Ferguson Power Plant was built.
ERCOT · Llano County
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 FERGCC_CC1 over 365 days (2025-11-02 to 2026-11-01). This plant is also crosswalked to FERGCC_GT1_1, FERGCC_GT2_3, FERGCC_ST1_5, FER_FERGUSG1; 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.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Fayette Power Project | 1,690 MW | TX | |
| Sim Gideon | 623 MW | TX | |
| Lost Pines 1 Power Project | 609 MW | TX | |
| Thomas C FergusonCurrent | 574.6 MW | TX | |
| Timmerman Power Plant | 368 MW | TX | |
| Winchester Power Park | 242 MW | TX | |
| Marshall Ford | 108 MW | TX | |
| Buchanan Dam (TX) | 54.9 MW | TX |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioThe original Ferguson plant went offline and was decommissioned before the replacement facility began operating.
EIA-860 lists generator CT-1, generator CT-2, generator STG with this operating date.
LCRA held a dedication ceremony and tours for the new Thomas C. Ferguson Power Plant.
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.
Thomas C Ferguson reports 574.6 MW natural gas of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
Thomas C Ferguson is a Natural Gas Fired Combined Cycle facility in Llano County, TX, participating in the ERCOT market.
Thomas C Ferguson is in Llano County, TX, inside the ERCOT balancing area.
Thomas C Ferguson is operated by Lower Colorado River Authority according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Thomas C Ferguson reported 3,750.3 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.
Thomas C Ferguson interconnects at LONGPRAIRIE, on the LCRA-TSP system.
By capacity, Thomas C Ferguson ranks #275 of 540 operating plants of the same technology nationally. It ranks #41 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.
