NaturEner Rim Rock Energy
Toole County, Montana · EIA plant ID 57995 · Operator: NaturEner Rim Rock Energy LLC
Nameplate189MWSummer 185 MW
Generators1in service
Net generation581GWh12 mo to Aug 2026
Capacity factor36%wind units, summer MW
Heat rate—thermal plants only
First online2012
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) |
|---|---|---|---|
| 2012 | 56.9 | 42.5% | — |
| 2013 | 335.8 | 21.3% | — |
| 2014 | 562.3 | 34.8% | — |
| 2015 | 603.5 | 37.3% | — |
| 2016 | 652.9 | 40.3% | — |
| 2017 | 657.6 | 40.7% | — |
| 2018 | 628.1 | 38.8% | — |
| 2019 | 597.2 | 36.9% | — |
| 2020 | 705.6 | 43.5% | — |
| 2021 | 645 | 39.9% | — |
| 2022 | 675.5 | 41.8% | — |
| 2023 | 563.6 | 34.9% | — |
| 2024 | 600.5 | 37.0% | — |
| 2025 | 525.5 | 32.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| RR | Onshore Wind Turbine | WT | 189 | 184.6 | Dec 2012 | Operating | — | acciona AW77/1500 |
Owner / operator
Operator: NaturEner Rim Rock Energy LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| NaturEner Rim Rock Energy LLC | 100.0% | 189 MW |
Nearby plants
Within 80 km.
| NaturEner Glacier Wind Energy 2 | 104 MW | 32.5 km |
| NaturEner Glacier Wind Energy 1 | 107 MW | 34.5 km |