Cassia Gulch
Twin Falls County, Idaho · EIA plant ID 56935 · Operator: Cassia Gulch
Nameplate19MWSummer 19 MW
Generators1in service
Net generation34GWh12 mo to Aug 2026
Capacity factor21%wind units, summer MW
Heat rate—thermal plants only
First online2009
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 | 31.3 | 22.6% | — |
| 2010 | 45.6 | 27.6% | — |
| 2011 | 45 | 27.2% | — |
| 2012 | 45 | 27.1% | — |
| 2013 | 43.4 | 26.2% | — |
| 2014 | 45.1 | 27.2% | — |
| 2015 | 35.5 | 21.4% | — |
| 2016 | 43.2 | 26.0% | — |
| 2017 | 38.8 | 23.4% | — |
| 2018 | 43.1 | 26.0% | — |
| 2019 | 40 | 24.2% | — |
| 2020 | 42 | 25.3% | — |
| 2021 | 41.3 | 25.0% | — |
| 2022 | 37.6 | 22.7% | — |
| 2023 | 37.9 | 22.9% | — |
| 2024 | 39.5 | 23.8% | — |
| 2025 | 35.4 | 21.4% | — |
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 | 18.9 | 18.9 | Mar 2009 | Operating | — | suzlon S88-2100 |
Owner / operator
Operator: Cassia Gulch. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Cassia Gulch | 100.0% | 19 MW |
Nearby plants
Within 80 km.
| High Mesa | 40 MW | 1.7 km |
| Tuana Springs | 17 MW | 2 km |
| Cassia Wind | 8 MW | 3.7 km |
| Thousand Springs Wind Park | 12 MW | 4.1 km |
| Oregon Trail Wind Park | 14 MW | 4.4 km |
| Payne's Ferry | 21 MW | 5.5 km |