1788.3 MW Conventional Steam Coal (594 MW) + Natural Gas Fired Combined Cycle (600 MW) + Natural Gas Fired Combustion Turbine (594 MW) operating in Mayes, OK — Southwest Power Pool
1,788.3 MW
Nameplate Capacity
4
Generators
units
Hybrid (3)
Technology
Conventional Steam Coal + Natural Gas Fired Combined Cycle + Natural Gas Fired Combustion Turbine
1985
Operating Since
Coordinates
36.1903, -95.2894
County
Mayes, OK
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Grand River Dam Authority | Grand River Dam Authority | — |
| Owner(s) | Grand River Dam Authority | Grand River Dam Authority | — |
| Status | Operating | — | — |
Located in Mayes County, Oklahoma, the plant is owned and operated by the Grand River Dam Authority. The facility has a total capacity of 1788.3 MW across four generators, making it the largest power plant in Oklahoma and the 39th largest in the United States. The plant is a hybrid facility utilizing multiple technologies including Conventional Steam Coal, Natural Gas Fired Combined Cycle, and Natural Gas Fired Combustion Turbine. The primary fuel source is natural gas. The plant began operating in 1985.
The plant operates within the Southwest Power Pool balancing authority and the MRO NERC region. The latest annual generation data shows an output of 3,996,684 MWh, resulting in a capacity factor of 25.5%. Financial data indicates a Power Purchase Agreement (PPA) price of $8.5 per MWh, as reported in FERC EQRs. News coverage related to the plant includes 6 articles categorized as industry news, 2 as regulatory news, and 1 as hazard-related news.
Generated from EIA, GEM, and public data sources
NERC Region
MRO
Balancing Authority
Southwest Power Pool
Grid Voltage
161 kV
Regulatory Status
RE
Entity Type
State
Sector
Electric Utility
228.1K MWh
Latest Month
4.0M MWh
Annual Generation
25.5%
Capacity Factor
$8.5/MWh
PPA Price
Grand River Dam Authority
Contract Seller
Per-Unit Cost Trends
Market Position
ISO/RTO Market
SPP
LMP Node
GRDAGRDA17UN2
Pricing Hub
SPP South Hub
Node Source
EIA-860 direct report
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Red Flag Warning issued March 21 at 12:15PM CDT until March 22 at 8:00PM CDT by NWS Tulsa OK
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Last updated 2026-03-21
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