Rocky Brook Hydroelectric
Jefferson County, Washington · EIA plant ID 50228 · Operator: Rocky Brook Electric Inc
Nameplate2MWSummer 0 MW
Generators1in service
Net generation0GWh12 mo to Dec 2025
Capacity factor41%hydro units, summer MW
Heat rate—thermal plants only
First online1985
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 | 3 | 22.5% | — |
| 2002 | 3.9 | 439.9% | — |
| 2003 | 1.9 | 213.9% | — |
| 2004 | 0.6 | 73.4% | — |
| 2005 | 2.5 | 289.4% | — |
| 2006 | 2 | 231.3% | — |
| 2007 | 1.4 | 163.5% | — |
| 2008 | 0.9 | 96.8% | — |
| 2009 | 1.2 | 137.6% | — |
| 2010 | 1.5 | 175.6% | — |
| 2011 | 1.9 | 219.5% | — |
| 2012 | 2.6 | 296.1% | — |
| 2013 | 0.8 | 95.3% | — |
| 2014 | 2 | 226.1% | — |
| 2015 | 0.7 | 84.1% | — |
| 2016 | 1.8 | 205.1% | — |
| 2017 | 0.9 | 100.9% | — |
| 2018 | 0.5 | 62.3% | — |
| 2019 | 0.4 | 50.2% | — |
| 2020 | 0.5 | 51.2% | — |
| 2021 | 0 | 0.0% | — |
| 2022 | 0 | 0.0% | — |
| 2023 | 0.2 | 25.0% | — |
| 2024 | 0.5 | 61.5% | — |
| 2025 | 0.4 | 40.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | HY | 1.6 | 0.1 | Dec 1985 | Operating (Standby / backup) | — | coming soon |
Owner / operator
Operator: Rocky Brook Electric Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Rocky Brook Electric Inc | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| AGATE BESS | — | 25.7 km |
| Lilliwaup Falls Generating | 1 MW | 30.6 km |
| West Point Treatment Plant | 5 MW | 37.7 km |
| Cushman 1 | 50 MW | 39.7 km |
| Cushman 2 | 85 MW | 42.2 km |
| Port Townsend Paper | 8 MW | 42.9 km |