Mammoth Plains
Dewey County, Oklahoma · EIA plant ID 59284 · Operator: Mammoth Plains Wind Project
Nameplate226MWSummer 226 MW
Generators1in service
Net generation623GWh12 mo to Dec 2025
Capacity factor31%wind units, summer MW
Heat rate—thermal plants only
First online2014
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), wind units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2014 | 49.4 | 33.4% | — |
| 2015 | 797.7 | 45.8% | — |
| 2016 | 834.7 | 47.8% | — |
| 2017 | 788.8 | 45.3% | — |
| 2018 | 826.8 | 47.4% | — |
| 2019 | 816.9 | 46.9% | — |
| 2020 | 808.3 | 46.2% | — |
| 2021 | 801 | 46.0% | — |
| 2022 | 802.6 | 46.0% | — |
| 2023 | 739.8 | 42.4% | — |
| 2024 | 719.9 | 41.2% | — |
| 2025 | 623 | 31.4% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GE1.7 | Onshore Wind Turbine | WT | 226.1 | 226.1 | Dec 2014 | Operating | — | ge 1.7-100 |
Owner / operator
Operator: Mammoth Plains Wind Project. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Mammoth Plains Wind Project | 100.0% | 226 MW |
Nearby plants
Within 80 km.
| Mammoth Plains Energy Storage II | — | 0.4 km |
| Mammoth Plains Energy Storage | — | 0.5 km |
| Crossroads Wind Farm | 228 MW | 6.3 km |
| Taloga Wind LLC | 130 MW | 27 km |
| Seiling Wind II | 99 MW | 30 km |
| Seiling Wind I | 199 MW | 30 km |