Markham
4221 E 545 RD, Locust Grove, OK 74352Plant Summary Information
Markham is ranked #3 out of 7 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 #2,086 out of 13,081 Power Plants Nationwide | |
| Ranked #159 out of 1,311 Water Power Plants Nationwide | |
| Ranked #83 out of 137 Oklahoma Power Plants | |
| Ranked #3 out of 7 Oklahoma Water Power Plants | |
| Fuel Types | Water |
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Monthly Net Generation for Markham
Monthly Plant Fuel Consumption for Markham
Markham Details
| 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 |
Generator 1 Details Operating May 1964
| 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 |
Generator 2 Details Operating May 1964
| 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 |
Generator 3 Details Operating May 1964
| 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 |
Generator 4 Details Operating May 1964
| 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 |
Markham Plant Owners
| Owner Name | Address | Generator | Ownership | We couldn't locate any owners for this plant |
|---|
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Power plants with a similar annual net generation from Water.
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|---|---|---|---|
| #149 | Ralston | Foresthill, CA | 302.6 GWh |
| #150 | Thermalito | Oroville, CA | 302.3 GWh |
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| #152 | Rainbow (MT) | Great Falls, MT | 298.6 GWh |
| #153 | Bliss (ID) | Bliss, ID | 297.7 GWh |
| #154 | Comerford | Monroe, NH | 296.8 GWh |
| #155 | Wyman Hydro | Bingham, ME | 295.2 GWh |
| #156 | Camino | Camino, CA | 293.9 GWh |
| #157 | LaGrande | La Grande, WA | 291.2 GWh |
| #158 | Walters | Waterville, NC | 289.1 GWh |
| #160 | Martin Dam | Dadeville, AL | 287.2 GWh |
| #161 | Don Pedro | La Grange, CA | 285.7 GWh |
| #162 | Snettisham | Juneau, AK | 285.3 GWh |
| #163 | Curtis Palmer Hydroelectric | Corinth, NY | 276.6 GWh |
| #164 | Caribou 1 | Belden, CA | 275.7 GWh |
| #165 | Lewis Smith Dam | Jasper, AL | 274.6 GWh |
| #166 | Big Creek 2A | Auberry, CA | 273.7 GWh |
| #167 | Canyon Ferry | Helena, MT | 273.1 GWh |
| #168 | Harry Truman | Warsaw, MO | 267.0 GWh |
| #169 | Greenup Hydro | Franklin Furnace, OH | 265.6 GWh |
Nearby Power Plants
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 | 2.8 TWh | 36.7 mi |
| Georgia-Pacific Muskogee | Muskogee, OK | 351.8 GWh | 35.1 mi |
| GREC | Chouteau, OK | 3.1 TWh | 6.6 mi |
| Green Country Power Station | Jenks, OK | 3.8 TWh | 45.4 mi |
| Huckleberry Solar | Pryor, OK | 18.9 GWh | 12.1 mi |
| Muskogee | Fort Gibson, OK | 2.8 TWh | 33 mi |
| Northeastern | Oologah, OK | 4.2 TWh | 32 mi |
| Oneta Energy Center | Broken Arrow, OK | 4.4 TWh | 32.5 mi |
| Ozark Solar Park | Lincoln, AR | 4.1 GWh | 47.4 mi |
| Pensacola | Langley, OK | 422.2 GWh | 18.1 mi |
| Riverside (OK) | Jenks, OK | 686.0 GWh | 46.2 mi |
| Tulsa | Tulsa, OK | 384.5 GWh | 45.8 mi |
| Tulsa LFG LLC | Sand Springs, OK | 14.7 GWh | 56.2 mi |
| Twelvemile Solar 1 | Tulsa, OK | 61.7 GWh | 7.4 mi |
| Twelvemile Solar 2 | Durant, OK | 30.1 GWh | 7.4 mi |
| UA Central Utility Plant | Fayetteville, AR | 36.5 GWh | 57.5 mi |
| Waste Management Eco Vista LFGTE | Springdale, AR | 21.5 GWh | 51.8 mi |
| Webbers Falls | Webbers Falls, OK | 174.3 GWh | 46.9 mi |
| XNA (NW AR Natnl Airport) | Bentonville, AR | 1.3 GWh | 48.7 mi |