Cascade Dam
Valley County, Idaho · EIA plant ID 813 · Operator: Idaho Power Co
Nameplate12MWSummer 14 MW
Generators2in service
Net generation40GWh12 mo to Dec 2025
Capacity factor34%hydro units, summer MW
Heat rate—thermal plants only
First online1983
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), hydro 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) |
|---|---|---|---|
| 2001 | 24.4 | 28.4% | — |
| 2002 | 32.4 | 37.8% | — |
| 2003 | 47.4 | 49.2% | — |
| 2004 | 35.7 | 37.0% | — |
| 2005 | 37.6 | 39.0% | — |
| 2006 | 56.4 | 58.5% | — |
| 2007 | 37.2 | 38.6% | — |
| 2008 | 47.3 | 49.0% | — |
| 2009 | 44.8 | 35.5% | — |
| 2010 | 35.8 | 28.4% | — |
| 2011 | 50.9 | 40.4% | — |
| 2012 | 52.9 | 41.9% | — |
| 2013 | 40 | 31.7% | — |
| 2014 | 43.1 | 34.2% | — |
| 2015 | 31.5 | 25.0% | — |
| 2016 | 42.2 | 33.4% | — |
| 2017 | 47.7 | 37.8% | — |
| 2018 | 46.9 | 37.2% | — |
| 2019 | 36.6 | 29.0% | — |
| 2020 | 36 | 28.4% | — |
| 2021 | 26.3 | 23.4% | — |
| 2022 | 33.6 | 29.3% | — |
| 2023 | 35.5 | 31.2% | — |
| 2024 | 37.4 | 31.3% | — |
| 2025 | 40.3 | 34.1% | — |
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 | Conventional Hydroelectric | HY | 6.2 | 7.2 | May 1984 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 6.2 | 6.4 | Dec 1983 | Operating | — | coming soon |
Owner / operator
Operator: Idaho Power Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Idaho Power Co | 100.0% | 12 MW |
Nearby plants
Within 80 km.
| Tamarack Energy Partnership | 6 MW | 54.7 km |
| Horseshoe Bend Hydroelectric Co | 9 MW | 70.9 km |
| Black Canyon | 10 MW | 73.1 km |
| Brownlee | 675 MW | 75.5 km |
| Oxbow (OR) | 190 MW | 79.5 km |
| El Dorado Hydro Elk Creek | 3 MW | 79.8 km |