Boundary
Pend Oreille County, Washington · EIA plant ID 6433 · Operator: City of Seattle - (WA)
Nameplate1,160MWSummer 1,145 MW
Generators6in service
Net generation4,117GWh12 mo to Aug 2026
Capacity factor41%hydro units, summer MW
Heat rate—thermal plants only
First online1967
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), 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 | 2,334.1 | 25.4% | — |
| 2002 | 3,955.2 | 43.0% | — |
| 2003 | 3,570.1 | 38.8% | — |
| 2004 | 3,496.9 | 37.9% | — |
| 2005 | 3,454.1 | 36.9% | — |
| 2006 | 4,312.4 | 46.0% | — |
| 2007 | 3,624.7 | 38.7% | — |
| 2008 | 3,812.5 | 41.7% | — |
| 2009 | 3,587 | 39.4% | — |
| 2010 | 3,138.4 | 34.5% | — |
| 2011 | 4,491.3 | 49.3% | — |
| 2012 | 3,795.4 | 41.5% | — |
| 2013 | 3,459.3 | 38.0% | — |
| 2014 | 4,243.4 | 45.2% | — |
| 2015 | 3,466 | 35.8% | — |
| 2016 | 3,884.5 | 40.1% | — |
| 2017 | 3,821.1 | 39.5% | — |
| 2018 | 4,003.8 | 41.4% | — |
| 2019 | 3,300.8 | 34.1% | — |
| 2020 | 3,570 | 36.8% | — |
| 2021 | 3,204.9 | 33.1% | — |
| 2022 | 3,706.2 | 38.3% | — |
| 2023 | 2,845.9 | 28.4% | — |
| 2024 | 3,020.3 | 30.0% | — |
| 2025 | 3,099.5 | 30.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 51 | Conventional Hydroelectric | HY | 180.5 | 180.5 | Oct 1967 | Operating | — | coming soon |
| 52 | Conventional Hydroelectric | HY | 161.5 | 161.5 | Aug 1967 | Operating | — | coming soon |
| 53 | Conventional Hydroelectric | HY | 158.4 | 158.4 | Sep 1967 | Operating | — | coming soon |
| 54 | Conventional Hydroelectric | HY | 180.5 | 180.5 | Aug 1967 | Operating | — | coming soon |
| 55 | Conventional Hydroelectric | HY | 239.4 | 232 | Nov 1985 | Operating | — | coming soon |
| 56 | Conventional Hydroelectric | HY | 239.4 | 232 | May 1986 | Operating | — | coming soon |
Owner / operator
Operator: City of Seattle - (WA). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of Seattle - (WA) | 100.0% | 1,160 MW |
Nearby plants
Within 80 km.
| Box Canyon | 90 MW | 23.5 km |
| Sheep Creek Hydro | 2 MW | 33 km |
| Smith Falls Hydro Project | 38 MW | 57.8 km |
| Meyers Falls | 2 MW | 68 km |
| Kettle Falls Generating Station | 58 MW | 69.2 km |