Grand River Energy Center, known as GREC, is a coal-and-natural-gas generating complex in Mayes County, Oklahoma, associated with the SPP registry. The EIA plant baseline lists 1,194.3 MW of nameplate capacity. The Grand River Dam Authority lists GREC Unit 2 at 492 MW and GREC Unit 3 at 495 MW, and says its first unit was decommissioned in 2019. The page keeps EIA's plant-level baseline and the authority's named-unit figures distinct.
Canonical EIA plant baseline.
plant-165
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 540 MW 40 MW summer | Natural Gas Steam Turbine Natural Gas · ST | Jun 1981 Retirement: Dec 2020 | Operating |
| 2 | 594 MW 478.9 MW summer | Conventional Steam Coal Subbituminous Coal · ST | Oct 1985 Retirement: Jun 2026 | Operating |
| 3CT | 369 MW 310.2 MW summer | Natural Gas Fired Combined Cycle Natural Gas · CT | Dec 2017 | Operating |
| 3ST |
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.
Project milestones and public references behind the asset profile.
EIA-860 lists generator 1 with this operating date.
| 231.3 MW 170.5 MW summer |
Natural Gas Fired Combined Cycle Natural Gas · CA |
| Dec 2017 |
| Operating |
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| GRECCurrent | 1,194.3 MW | OK | |
| Salina | 259.2 MW | OK | |
| Pensacola | 129.6 MW | OK | |
| Markham | 128.4 MW | OK |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
EIA-860 lists generator 2 with this operating date.
The Grand River Dam Authority says GREC Unit 3 began production in 2017.
EIA-860 lists generator 3CT, generator 3ST with this operating date.
The Grand River Dam Authority says GREC Unit 1 was decommissioned in 2019.
EIA-860 lists a planned retirement for generator 1.
EIA-860 lists a planned retirement for generator 2.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
GREC has a reported capacity of 1,194.3 MW. Source: EIA Form 860M.
GREC is a Conventional Steam Coal facility in Mayes County, OK, participating in the SPP market.
GREC is in Mayes County, OK, inside the SPP balancing area.
GREC is operated by Grand River Dam Authority according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
GREC reported 3,232.5 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.
By capacity, GREC ranks #247 of 538 operating plants of the same technology nationally. It ranks #6 of 12 in OK.
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.
