Spion Kop Wind Farm
Judith Basin County, Montana · EIA plant ID 58218 · Operator: NorthWestern Energy DGGS
Nameplate40MWSummer 40 MW
Generators1in service
Net generation98GWh12 mo to Dec 2025
Capacity factor28%wind units, summer MW
Heat rate—thermal plants only
First online2012
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) |
|---|---|---|---|
| 2013 | 144.1 | 41.1% | — |
| 2014 | 136.4 | 38.9% | — |
| 2015 | 127.6 | 36.4% | — |
| 2016 | 130.7 | 37.2% | — |
| 2017 | 131.2 | 37.4% | — |
| 2018 | 124.4 | 35.5% | — |
| 2019 | 120.9 | 34.5% | — |
| 2020 | 146 | 41.5% | — |
| 2021 | 118 | 33.7% | — |
| 2022 | 120.9 | 34.5% | — |
| 2023 | 112.2 | 32.0% | — |
| 2024 | 110.8 | 31.5% | — |
| 2025 | 97.7 | 27.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| SKW25 | Onshore Wind Turbine | WT | 40 | 40 | Dec 2012 | Operating | — | ge 1.6-82.5 |
Owner / operator
Operator: NorthWestern Energy DGGS. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| NorthWestern Energy DGGS | 100.0% | 40 MW |
Nearby plants
Within 80 km.
| South Peak Wind | 80 MW | 1.9 km |
| Morony | 63 MW | 42.1 km |
| Ryan | 55 MW | 44.9 km |
| Cochrane | 59 MW | 47.6 km |
| Rainbow (MT) | 59 MW | 48 km |
| Black Eagle | 27 MW | 51.3 km |