Freestone Energy Center
Calpine · Freestone County · ERCOT
Freestone Energy Center is a two-block natural-gas combined-cycle plant near Fairfield in Freestone County, registered as EIA Plant ID 55226. EIA's May 2026 inventory lists six operating generators—four combustion turbines and two steam turbines—with 1,036 MW of nameplate capacity, 1,032 MW of net summer capability, and 1,095.2 MW of net winter capability. Calpine operates the facility through Freestone Power Generation LLC; Calpine is now a business unit of Constellation. The plant's ERCOT resources are organized as the FREC_CC1 and FREC_CC2 combined-cycle blocks.
Overview
Key fields
- Net summer capability
- 1,032 MW
EIA May 2026
- Nameplate capacity
- 1,036 MW
Six operating generators
- Net winter capability
- 1,095.2 MW
EIA May 2026
- 12-month generation
- 6.17 TWh
May 2025–Apr 2026 · EIA Form 923
- Capacity factor
- 68.27%
Against net summer capability
- Registry anchor
- Plant 55226
Freestone Power Generation LLC · ERCOT
Profile
- Plant configuration
- Two combined-cycle blocks with four combustion turbines and two steam turbines.
- ERCOT resources
- FREC_CC1 and FREC_CC2; six underlying generator units are registered with EIA.
- Environmental controls
- Dry low-NOx combustors and continuous NOx emissions monitoring under TCEQ Title V Permit O2156.
- Adjacent development
- A 380 MW CyrusOne data center is planned next to the plant, with an exclusive option for a second 380 MW phase.
Structured profile
- Owner / operator
- Calpine / Freestone Power Generation LLC
Calpine is a Constellation business unit
- ERCOT blocks
- FREC_CC1 · FREC_CC2
Natural-gas combined cycle
- Operating permit
- TCEQ O2156
RN102333853
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| GT1 | 166.7 MW 167 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Jun 2002 | Operating |
| GT2 | 166.7 MW 167 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Jun 2002 | Operating |
| GT3 | 166.7 MW 167 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Jul 2002 | Operating |
| GT4 | 166.7 MW 167 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Jul 2002 | Operating |
| ST3 | 184.6 MW 182 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CA | Jun 2002 | Operating |
| ST6 | 184.6 MW 182 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CA | Jul 2002 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 1,036 MW
- National rank
- #89
- TX rank
- #11
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.
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.
Interconnection record
ERCOT GIS ReportMatched to the latest available ERCOT generation-interconnection queue record. Queue status and completion dates describe the queue record; operating status is verified separately against plant and market registrations.
Nearby 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 |
|---|---|---|
| Grid selection | plant:plant-55226 | Canonical asset page /ercot/assets/plant/freestone-energy-center. |
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
- Generators Entered ServiceEIA May 202...
EIA reports June and July 2002 operating dates across the two combined-cycle blocks.
- Generators enter operationEIA-860
EIA-860 lists generator GT3, generator GT4, generator ST6 with this operating date.
- Adjacent data-center agreement announcedConstellati...
Calpine signed a 380 MW power, grid-connectivity, and site-infrastructure agreement for a CyrusOne data center adjacent to Freestone, with an exclusive additional 380 MW second phase.
Sources
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