Mainline Windfarm
Elmore County, Idaho · EIA plant ID 57429 · Operator: mountain air projects, llc
Nameplate23MWSummer 23 MW
Generators1in service
Net generation52GWh12 mo to Dec 2025
Capacity factor26%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) |
|---|---|---|---|
| 2012 | 19.2 | 111.9% | — |
| 2013 | 52.7 | 26.1% | — |
| 2014 | 59.2 | 29.4% | — |
| 2015 | 48.3 | 23.9% | — |
| 2016 | 58.9 | 29.1% | — |
| 2017 | 50.8 | 25.2% | — |
| 2018 | 57.6 | 28.6% | — |
| 2019 | 55.3 | 27.4% | — |
| 2020 | 56.5 | 28.0% | — |
| 2021 | 58 | 28.8% | — |
| 2022 | 54 | 26.8% | — |
| 2023 | 54.9 | 27.3% | — |
| 2024 | 61.7 | 30.6% | — |
| 2025 | 52.2 | 25.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Onshore Wind Turbine | WT | 23 | 23 | Dec 2012 | Operating | — | siemens SWT-2.3-101 |
Owner / operator
Operator: mountain air projects, llc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| mountain air projects, llc | 100.0% | 23 MW |
Nearby plants
Within 80 km.
| Cold Springs Windfarm | 23 MW | 2.5 km |
| Ryegrass Windfarm | 23 MW | 2.5 km |
| Desert Meadow Windfarm | 23 MW | 3.3 km |
| Mountain Home | 21 MW | 4.9 km |
| Bennett Creek Windfarm LLC - Mountain Home | 21 MW | 5.5 km |
| Two Ponds Windfarm | 23 MW | 5.9 km |