Markham

4221 E 545 RD, Locust Grove, OK 74352

Plant Summary Information

Markham is ranked #5 out of 10 hydroelectric power plants in Oklahoma in terms of total annual net electricity generation.

Markham is comprised of 4 generators and generated 21.2 GWh during the 3-month period between September 2025 to December 2025.

Plant Name	Markham
Utility Name	Grand River Dam Authority
Location	Mayes County, OK
Initial Operation Date	May 1964
Last Update	Dec 2025
Annual Generation	288.1 GWh
Annual Consumption	999.1 k MMBtu
Ranked #2,117 out of 13,301 Power Plants Nationwide
Ranked #163 out of 1,316 Water Power Plants Nationwide
Ranked #86 out of 145 Oklahoma Power Plants
Ranked #5 out of 10 Oklahoma Water Power Plants
Fuel Types	Water

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Summary Information
Plant Name	Markham (2980)
Plant Address	4221 E 545 RD, Locust Grove, OK 74352
Utility	Grand River Dam Authority (7490)
Latitude, Longitude	36.2317, -95.1822
Generation Dates on File	Jan 2001 to Dec 2025
Initial Operation Date	May 1964
Annual Generation	288.1 GWh
Fuel Types	Water

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

Regulatory Information
Regulatory Status	Regulated
NERC Region	MRO
Balancing Authority	Southwest Power Pool (SWPP)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Grand Neosho
Ash Impoundment	No
Transmission / Distribution Owner	Grand River Dam Authority (7490) OK
Grid Voltage	161.00 kV / 115.00 kV
Energy Storage	No

* Data obtained from the 2025 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	GRDAKERR_HYDUN1
RTO ISO Location Designation For Reporting Wholesale Sales Data	GRDAKERR_HYDUN1_RA
Nameplate Capacity	32.1 MW
Nameplate Power Factor	0.93
Summer Capacity	31.7 MW
Winter Capacity	31.7 MW
Minimum Load	18 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	May 1964
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	GRDAKERR_HYDUN2
RTO ISO Location Designation For Reporting Wholesale Sales Data	GRDAKERR_HYDUN2_RA
Nameplate Capacity	32.1 MW
Nameplate Power Factor	0.93
Summer Capacity	31.9 MW
Winter Capacity	31.9 MW
Minimum Load	18 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	May 1964
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	GRDAKERR_HYDUN3
RTO ISO Location Designation For Reporting Wholesale Sales Data	GRDAKERR_HYDUN3_RA
Nameplate Capacity	32.1 MW
Nameplate Power Factor	0.93
Summer Capacity	32 MW
Winter Capacity	32 MW
Minimum Load	18 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	May 1964
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	GRDAKERR_HYDUN4
RTO ISO Location Designation For Reporting Wholesale Sales Data	GRDAKERR_HYDUN4_RA
Nameplate Capacity	32.1 MW
Nameplate Power Factor	0.93
Summer Capacity	31.8 MW
Winter Capacity	31.8 MW
Minimum Load	18 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	May 1964
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Owner Name	Address	Generator	Ownership
*We couldn't locate any owners for this plant*

Power plants with a similar annual net generation from Water.

Rank	Plant Name	Plant Location	Annual Generation
#153	Rainbow (MT)	Great Falls, MT	298.6 GWh
#154	Bliss (ID)	Bliss, ID	297.7 GWh
#155	Camino	Camino, CA	297.3 GWh
#156	Comerford	Monroe, NH	296.8 GWh
#157	Wyman Hydro	Bingham, ME	295.2 GWh
#158	Eufaula Dam	Porum, OK	294.0 GWh
#159	Keystone Dam	Sand Springs, OK	293.3 GWh
#160	LaGrande	La Grande, WA	291.2 GWh
#161	Walters	Waterville, NC	289.1 GWh
#162	Don Pedro	La Grange, CA	288.3 GWh
#164	Martin Dam	Dadeville, AL	287.2 GWh
#165	Snettisham	Juneau, AK	285.3 GWh
#166	Ozark	Ozark, AR	279.6 GWh
#167	Curtis Palmer Hydroelectric	Corinth, NY	276.6 GWh
#168	Caribou 1	Belden, CA	275.7 GWh
#169	Lewis Smith Dam	Jasper, AL	274.6 GWh
#170	Canyon Ferry	Helena, MT	273.1 GWh
#171	Harry Truman	Warsaw, MO	270.5 GWh
#172	Greenup Hydro	Franklin Furnace, OH	265.6 GWh
#173	Morrow Point	Montrose, CO	262.8 GWh

Below are closest 20 power plants surrounding Markham.

Plant Name	Plant Location	Annual Generation	Distance
Chouteau	Pryor, OK	6.3 TWh	5.3 mi
Flint Creek	Gentry, AR	2.6 TWh	36.7 mi
Fort Gibson	Fort Gibson, OK	217.3 GWh	25.2 mi
Georgia-Pacific Muskogee	Muskogee, OK	350.2 GWh	35.1 mi
GREC	Chouteau, OK	2.7 TWh	6.6 mi
Green Country Power Station	Jenks, OK	4.1 TWh	45.4 mi
Huckleberry Solar	Pryor, OK	120.8 GWh	12.1 mi
Mayes County Solar	Pryor, OK	6.6 GWh	14.2 mi
Muskogee	Fort Gibson, OK	3.0 TWh	33 mi
Northeastern	Oologah, OK	3.7 TWh	32 mi
Oneta Energy Center	Broken Arrow, OK	4.3 TWh	32.5 mi
Pensacola	Langley, OK	422.2 GWh	18.1 mi
Riverside (OK)	Jenks, OK	899.6 GWh	46.2 mi
Saltbranch 2	Tulsa, OK	17.6 GWh	7.4 mi
Saltbranch Solar 1	Tulsa, OK	13.2 GWh	7.4 mi
Tenkiller Ferry	Gore, OK	11.0 GWh	44.6 mi
Tulsa	Tulsa, OK	295.0 GWh	45.8 mi
Twelvemile Solar 1	Tulsa, OK	139.1 GWh	7.4 mi
Twelvemile Solar 2	Durant, OK	67.0 GWh	7.4 mi
Webbers Falls	Webbers Falls, OK	205.2 GWh	46.9 mi