Happy Jack Windpower Project
Laramie County, Wyoming · EIA plant ID 56960 · Operator: Duke Energy Renewables Services
Nameplate29MWSummer 29 MW
Generators1in service
Net generation66GWh12 mo to Aug 2026
Capacity factor26%wind units, summer MW
Heat rate—thermal plants only
First online2008
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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) |
|---|---|---|---|
| 2009 | 84.1 | 32.6% | — |
| 2010 | 82.4 | 32.0% | — |
| 2011 | 90.2 | 35.0% | — |
| 2012 | 85 | 32.9% | — |
| 2013 | 87 | 33.8% | — |
| 2014 | 89.6 | 34.8% | — |
| 2015 | 72.2 | 28.0% | — |
| 2016 | 85.6 | 33.2% | — |
| 2017 | 83.6 | 32.5% | — |
| 2018 | 80.3 | 31.2% | — |
| 2019 | 76.8 | 29.8% | — |
| 2020 | 86.6 | 33.5% | — |
| 2021 | 67.7 | 26.3% | — |
| 2022 | 71.3 | 27.7% | — |
| 2023 | 58.7 | 22.8% | — |
| 2024 | 56.8 | 22.0% | — |
| 2025 | 58.7 | 22.8% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| HJW01 | Onshore Wind Turbine | WT | 29.4 | 29.4 | Aug 2008 | Operating | — | suzlon S88-2100 |
Owner / operator
Operator: Duke Energy Renewables Services. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Duke Energy DEGS Happy Jack | 100.0% | 29 MW |
Nearby plants
Within 80 km.
| Silver Sage Windpower | 42 MW | 2.5 km |
| Corriedale Wind Energy | 53 MW | 3.2 km |
| Roundhouse Renewable Energy II | 106 MW | 9.5 km |
| Roundhouse Wind Energy Project | 226 MW | 10.4 km |
| South Cheyenne Solar | 150 MW | 22.4 km |
| Cheyenne Prairie Generating Station | 140 MW | 23.3 km |