In Mayes County, Oklahoma (OK). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

1 GW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.

EIA-860M names Grand River Dam Authority as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.

Is this the same as GREC LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Grand River Dam Authority here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "GREC LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is GREC still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

GREC

GREC is a 1 GW natural gas power plant in Mayes County, Oklahoma, operated by Grand River Dam Authority. EIA-860M lists 3 generating units here, inside SPP. Its units entered service between 1985 and 2017.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Nameplate capacity: 1,194.3 MW; 959.6 MW net summer
Generating units: 3
In service: 1985–2017
EIA plant ID: 165

Where it is

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County: Mayes County, Oklahoma
Coordinates: 36.1903, -95.2894
Balancing authority: SWPP
Sector: Electric Utility

Units, technology and status

Operator of record: Grand River Dam Authority
Primary energy source: Natural gas
Technologies: Conventional Steam Coal, Natural Gas Fired Combined Cycle
Status: Operating

This site runs on more than one energy source. EIA-860M capacity splits: Natural gas 600 MW, Coal 594 MW. It is filed here under Natural gas, the source with the most capacity.

Every plant Grand River Dam Authority reports to EIA →

GREC: FAQ

Where is GREC?: In Mayes County, Oklahoma (OK). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
How big is GREC?: 1 GW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.
Who owns GREC?: EIA-860M names Grand River Dam Authority as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
Is this the same as GREC LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Grand River Dam Authority here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "GREC LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is GREC still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.