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- Combustion
- Clean firm
- Wind & solar
- Loads
- In development
- Under construction
- Operating
- Size not stated
- 10 · 100 · 1,000 MW
Map
- Combustion
- Clean firm
- Wind & solar
- Loads
- In development
- Under construction
- Operating
- Size not stated
Markham: location and 5 exact-grade projects within 25 km. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Markham
Power plant · Hydro
Key facts
Power plant · Hydroran 26% of 2025 Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1964
- Net generation, 2025
- 288,136 MWh
- Grid
- 161 kV, 115 kV to Grand River Dam Authority (SWPP)
- Location
- Mayes County, Oklahoma
- Operated by
- Grand River Dam AuthoritySourceEIA-860M Preliminary Monthly Electric Generator Inventory
Output
Details
Who’s behind it
No companies named in filings yet.
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- Technology
- Hydro source: “Conventional Hydroelectric”
- Age
- 62 years since 1964
All 6 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
| Attribute | Value |
|---|---|
| Gem |
|
| Grid |
|
| Fuel burned (MMBtu), 2025 | 983,122 |
| Capacity factor, 2025 | 0.256 |
| Net generation (MWh), 2025 | 288,136 |
| Balancing authority code | SWPP |
Timeline
- In service · EIA-860M
Sources
4 sourcesSources EIA-860M · GEM · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory
Sources
- EIA-860M Preliminary Monthly Electric Generator Inventory
- Global Energy Monitor — Global Integrated Power Tracker (unit-level power plants, eight technologies, all statuses)Global Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
- EIA Open Data bulk file — Electricity (ELEC.zip; monthly plant net generation and fuel consumption since 2001)Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
- EIA-860M Preliminary Monthly Electric Generator Inventory
Around this plant
Nearby
within 25 km| Project | Kind | Away | MW |
|---|---|---|---|
| Grand River Energy Center Solar Postponed | Solar | 10.3 km | 84 |
| GREC Under construction | Gas, combustion turbine | 10.7 km | 594 |
| Chimney Rock AOI (Pryor data centre) Filed | Large load | 10.9 km | |
| Twelvemile Solar 3 Under construction | Solar | 11.9 km | 200 |
| MYALL LLC / PRY DATA STORAGE FACILITY Built | Large load | 13.6 km |
Sources EIA-860M · FAA OE/AAA · EPA ICIS-Air