Wygen III
Campbell County, Wyoming · EIA plant ID 56596 · Operator: Black Hills Power, Inc. d/b/a
Nameplate116MWSummer 100 MW
Generators1in service
Net generation95GWh12 mo to Dec 2025
Capacity factor11%gas/coal/oil units, summer MW
Heat rate12,639Btu/kWhfossil units, electric fuel, HHV
First online2010Runs as baseload
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) |
|---|---|---|---|
| 2010 | 598.4 | 90.7% | 11,273 |
| 2011 | 821.5 | 93.8% | 11,425 |
| 2012 | 855.1 | 97.4% | 11,345 |
| 2013 | 837.9 | 95.7% | 11,469 |
| 2014 | 839 | 95.8% | 11,483 |
| 2015 | 773.8 | 88.3% | 11,568 |
| 2016 | 821.7 | 93.5% | 11,456 |
| 2017 | 772.4 | 88.2% | 11,536 |
| 2018 | 852 | 97.3% | 11,509 |
| 2019 | 762.3 | 87.0% | 11,461 |
| 2020 | 843 | 96.0% | 11,461 |
| 2021 | 831.9 | 95.0% | 11,462 |
| 2022 | 805.2 | 91.9% | 11,447 |
| 2023 | 794.7 | 90.7% | 11,505 |
| 2024 | 670.7 | 76.3% | 11,812 |
| 2025 | 95 | 10.8% | 12,639 |
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 |
|---|---|---|---|---|---|---|---|---|
| 5 | Conventional Steam Coal | ST | 116 | 100 | Apr 2010 | Operating | — | coming soon |
Owner / operator
Operator: Black Hills Power, Inc. d/b/a. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Black Hills Power, Inc. | 52.0% | 60 MW |
| Montana-Dakota Utilities Co | 25.0% | 29 MW |
| City Of Gillette | 23.0% | 27 MW |
Nearby plants
Within 80 km.
| Wygen 2 | 95 MW | 0 km |
| Wyodak | 362 MW | 0.2 km |
| Wygen 1 | 90 MW | 0.7 km |
| Neil Simpson II | 130 MW | 0.7 km |
| Neil Simpson Gas Turbine #2 | 40 MW | 0.8 km |
| Dry Fork Station | 484 MW | 12.5 km |