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128.4 MW Hydro operating in Mayes, OK — Southwest Power Pool
128.4 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1964
Operating Since
| 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 | operating | — |
The Markham hydroelectric plant is located in Mayes County, Oklahoma. It is owned and operated by the Grand River Dam Authority (GRDA). The plant has a total capacity of 128.4 MW consisting of 4 generators utilizing conventional hydroelectric technology. The plant began operating in 1964 and its primary fuel source is water (WAT). Markham operates within the Southwest Power Pool (SPP) balancing authority and the Midwest Reliability Organization (MRO) NERC region.
In the most recent year with available data, Markham generated 188,164 MWh of electricity, resulting in a capacity factor of 16.7%. Financial data indicates a power purchase agreement (PPA) price of $8.5 per MWh, as reported to FERC. Markham is the third-largest of five hydroelectric plants in Oklahoma, and ranks 151st out of 194 hydroelectric plants nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
SPP
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
4.7K MWh
Latest Month
188.2K MWh
Annual Generation
16.7%
Capacity Factor
Grand River Dam Authority · Data from 2019–2025
$8.5/MWh
PPA Price
Point of Interconnection
Nearest Substation
Kerr Substation · 161 kV
Substation Distance
< 10 km
Operator
Grand River Dam Authority
Coord Source
OSM spatial
Market Position
ISO/RTO Market
SPP
LMP Node
GRDAKERR_HYDUN1
Pricing Hub
SPP South Hub
Node Source
EIA-860 direct report
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Grid Voltage
161.0 kV
Regulatory Status
RE — Regulated
Entity Type
State
Sector
Electric Utility