Stillwater Energy Center
Payne County, Oklahoma · EIA plant ID 59647 · Operator: Stillwater Utilities Authority
Nameplate56MWSummer 56 MW
Generators3in service
Net generation108GWh12 mo to Dec 2025
Capacity factor22%gas/coal/oil units, summer MW
Heat rate9,327Btu/kWhfossil units, electric fuel, HHV
First online2016Runs as intermediate
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), gas/coal/oil 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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2016 | 32.8 | 13.3% | 9,887 |
| 2017 | 47.5 | 9.7% | 9,463 |
| 2018 | 34.5 | 7.0% | 9,434 |
| 2019 | 44.1 | 9.0% | 9,388 |
| 2020 | 30.6 | 6.2% | 9,469 |
| 2021 | 75.9 | 15.5% | 9,383 |
| 2022 | 136.6 | 27.9% | 9,273 |
| 2023 | 88.4 | 18.1% | 9,448 |
| 2024 | 138.8 | 28.3% | 9,245 |
| 2025 | 107.7 | 22.0% | 9,327 |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Natural Gas Internal Combustion Engine | IC | 18.8 | 18.6 | Jul 2016 | Operating | — | coming soon |
| 2 | Natural Gas Internal Combustion Engine | IC | 18.8 | 18.6 | Jul 2016 | Operating | — | coming soon |
| 3 | Natural Gas Internal Combustion Engine | IC | 18.8 | 18.6 | Jul 2016 | Operating | — | coming soon |
Owner / operator
Operator: Stillwater Utilities Authority. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Stillwater Utilities Authority | 100.0% | 56 MW |
Nearby plants
Within 80 km.
| Boomer Lake Station | retired | 3.4 km |
| Willow Creek Wind (OK) | 220 MW | 10.8 km |
| Ripley Energy Center | — | 13.2 km |
| Willow Creek Energy Storage | — | 25.3 km |
| Cushing | 25 MW | 30.8 km |
| Sooner | 1,138 MW | 32.4 km |