Lilliwaup Falls Generating
Hydro power plant in Mason County, Washington. 1.4 MW of nameplate capacity across 7 generators, operated by William G. Reed Jr.
Also known as EIA plant 50700
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 1.4 MWNameplate
- Generators
- 7 operatingEIA-860M, August 2026
- Operating since
- May 1986First generator online
- Operator
- William G. Reed JrEIA operator ID 15795
- Grid
- BPATBalancing authority BPAT
- Price nodes
- None linkedNo verified ISO node
- Location
- Mason County, WA47.4706, −123.1153
- EIA plant ID
- 50700EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Lilliwaup Falls Generating produces
Free · EIA-923Net generation, 2025
5.33 GWh
5,325 MWh, final
Capacity factor, 2025
43.4%
2024: 43.9%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
3.6–6.2
GWh a year. Low 2019, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 5,204 | Not reported | 12 of 12 |
| 2002 | 5 | Not reported | 12 of 12 |
| 2003 | 6,203 | Not reported | 12 of 12 |
| 2004 | 5 | Not reported | 12 of 12 |
| 2005 | 5 | Not reported | 12 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | 4,238 | 34.6% | 12 of 12 |
| 2016 | 6,006 | 48.8% | 12 of 12 |
| 2017 | 6,172 | 50.3% | 12 of 12 |
| 2018 | 5,140 | 41.9% | 12 of 12 |
| 2019 | 3,617 | 29.5% | 12 of 12 |
| 2020 | 4,989 | 40.6% | 12 of 12 |
| 2021 | 5,552 | 45.3% | 12 of 12 |
| 2022 | 5,740 | 46.8% | 12 of 12 |
| 2023 | 6,033 | 49.2% | 12 of 12 |
| 2024 | 5,397 | 43.9% | 12 of 12 |
| 2025 | 5,325 | 43.4% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 4735 | Conventional Hydroelectric | 0.2 | May 1986 |
| 4736 | Conventional Hydroelectric | 0.2 | May 1986 |
| 4737 | Conventional Hydroelectric | 0.2 | May 1986 |
| 4738 | Conventional Hydroelectric | 0.2 | May 1986 |
| 4739 | Conventional Hydroelectric | 0.2 | May 1986 |
| 4740 | Conventional Hydroelectric | 0.2 | May 1986 |
| 4741 | Conventional Hydroelectric | 0.2 | May 1986 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists William G. Reed Jr as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Questions about Lilliwaup Falls Generating
How much power does Lilliwaup Falls Generating produce?
Lilliwaup Falls Generating reported 5,325 MWh (5.33 GWh) of net generation in 2025, a 43.4% capacity factor on 1.4 MW of nameplate capacity.
Where is Lilliwaup Falls Generating?
Lilliwaup Falls Generating is in Mason County, Washington, at 47.4706, −123.1153. It is in the Bonneville Power Administration balancing area (BPAT).
Who operates Lilliwaup Falls Generating?
EIA-860M for August 2026 lists William G. Reed Jr as the operator (EIA operator ID 15795). The operator is not always the owner.
When did Lilliwaup Falls Generating start operating?
Its first generator began operating in May 1986, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page