Nine Mile
Spokane County, Washington · EIA plant ID 3869 · Operator: Avista Corp
Nameplate38MWSummer 38 MW
Generators4in service
Net generation132GWh12 mo to Dec 2025
Capacity factor40%hydro units, summer MW
Heat rate—thermal plants only
First online1908
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 | 99.3 | 46.5% | — |
| 2002 | 125.6 | 58.8% | — |
| 2003 | 122.4 | 57.3% | — |
| 2004 | 134.9 | 63.4% | — |
| 2005 | 107.1 | 50.5% | — |
| 2006 | 110.1 | 56.6% | — |
| 2007 | 99.4 | 51.1% | — |
| 2008 | 104.9 | 53.8% | — |
| 2009 | 105.9 | 54.4% | — |
| 2010 | 101.4 | 52.2% | — |
| 2011 | 90 | 46.3% | — |
| 2012 | 106.2 | 60.5% | — |
| 2013 | 82.9 | 59.2% | — |
| 2014 | 55.6 | 39.7% | — |
| 2015 | 66.9 | 38.2% | — |
| 2016 | 108.8 | 36.9% | — |
| 2017 | 114.4 | 38.9% | — |
| 2018 | 143.3 | 48.7% | — |
| 2019 | 119.6 | 36.3% | — |
| 2020 | 117.9 | 35.7% | — |
| 2021 | 131 | 39.8% | — |
| 2022 | 149.8 | 45.5% | — |
| 2023 | 118.3 | 35.9% | — |
| 2024 | 125.7 | 38.1% | — |
| 2025 | 132.2 | 40.1% | — |
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 | 8.8 | 8.8 | Jul 1910 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 8.8 | 8.8 | Jul 1908 | Operating | — | coming soon |
| 3N | Conventional Hydroelectric | HY | 10 | 10 | Jun 1994 | Operating | — | coming soon |
| 4N | Conventional Hydroelectric | HY | 10 | 10 | Jun 1994 | Operating | — | coming soon |
Owner / operator
Operator: Avista Corp. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Avista Corp | 100.0% | 38 MW |
Nearby plants
Within 80 km.
| Northeast (WA) | 62 MW | 13 km |
| Upper Falls | 10 MW | 15.6 km |
| Monroe Street | 15 MW | 15.6 km |
| Spokane Waste to Energy | 26 MW | 16.1 km |
| Upriver Dam Hydro Plant | 18 MW | 18.2 km |
| Long Lake | 70 MW | 23.5 km |