Lilliwaup Falls Generating
Mason County, Washington · EIA plant ID 50700 · Operator: William G. Reed Jr
Nameplate1MWSummer 1 MW
Generators7in service
Net generation5GWh12 mo to Dec 2025
Capacity factor43%hydro units, summer MW
Heat rate—thermal plants only
First online1986
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 | 5.2 | 42.4% | — |
| 2002 | 0 | 0.0% | — |
| 2003 | 6.2 | 50.6% | — |
| 2004 | 0 | 0.0% | — |
| 2005 | 0 | 0.0% | — |
| 2015 | 4.2 | 34.6% | — |
| 2016 | 6 | 48.8% | — |
| 2017 | 6.2 | 50.3% | — |
| 2018 | 5.1 | 41.9% | — |
| 2019 | 3.6 | 29.5% | — |
| 2020 | 5 | 40.6% | — |
| 2021 | 5.6 | 45.3% | — |
| 2022 | 5.7 | 46.8% | — |
| 2023 | 6 | 49.2% | — |
| 2024 | 5.4 | 43.9% | — |
| 2025 | 5.3 | 43.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 4735 | Conventional Hydroelectric | HY | 0.2 | 0.2 | May 1986 | Operating | — | coming soon |
| 4736 | Conventional Hydroelectric | HY | 0.2 | 0.2 | May 1986 | Operating | — | coming soon |
| 4737 | Conventional Hydroelectric | HY | 0.2 | 0.2 | May 1986 | Operating | — | coming soon |
| 4738 | Conventional Hydroelectric | HY | 0.2 | 0.2 | May 1986 | Operating | — | coming soon |
| 4739 | Conventional Hydroelectric | HY | 0.2 | 0.2 | May 1986 | Operating | — | coming soon |
| 4740 | Conventional Hydroelectric | HY | 0.2 | 0.2 | May 1986 | Operating | — | coming soon |
| 4741 | Conventional Hydroelectric | HY | 0.2 | 0.2 | May 1986 | Operating | — | coming soon |
Owner / operator
Operator: William G. Reed Jr. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| William G. Reed Jr | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Cushman 1 | 50 MW | 10.1 km |
| Cushman 2 | 85 MW | 11.7 km |
| Rocky Brook Hydroelectric | 2 MW | 30.6 km |
| Wynoochee | 13 MW | 38.1 km |
| AGATE BESS | — | 50.5 km |
| West Point Treatment Plant | 5 MW | 54.5 km |