Stillwater Hydro Station
Penobscot County, Maine · EIA plant ID 1478 · Operator: Brookfield Black Bear Hydro, LLC
Nameplate2MWSummer 2 MW
Generators4in service
Net generation6GWh12 mo to Dec 2025
Capacity factor32%hydro units, summer MW
Heat rate—thermal plants only
First online1913
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 | 9.2 | 61.5% | — |
| 2002 | 9.3 | 50.4% | — |
| 2003 | 8.9 | 48.4% | — |
| 2004 | 11.5 | 62.5% | — |
| 2005 | 12 | 65.2% | — |
| 2006 | 11.7 | 63.7% | — |
| 2007 | 12.8 | 69.3% | — |
| 2008 | 12.4 | 67.3% | — |
| 2009 | 11.1 | 60.3% | — |
| 2010 | 12.7 | 68.9% | — |
| 2011 | 12.1 | 66.0% | — |
| 2012 | 13.6 | 73.9% | — |
| 2013 | 10.5 | 56.9% | — |
| 2014 | 10.8 | 58.6% | — |
| 2015 | 12 | 65.2% | — |
| 2016 | 10.7 | 57.8% | — |
| 2017 | 8.7 | 47.2% | — |
| 2018 | 8.7 | 47.2% | — |
| 2019 | 10.9 | 59.4% | — |
| 2020 | 7.6 | 41.2% | — |
| 2021 | 7.3 | 39.5% | — |
| 2022 | 9.8 | 53.3% | — |
| 2023 | 12.1 | 65.6% | — |
| 2024 | 7 | 37.7% | — |
| 2025 | 5.9 | 32.1% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| SW01 | Conventional Hydroelectric | HY | 0.4 | 0.5 | Jan 1913 | Operating | — | coming soon |
| SW02 | Conventional Hydroelectric | HY | 0.4 | 0.5 | Jan 1913 | Operating | — | coming soon |
| SW03 | Conventional Hydroelectric | HY | 0.4 | 0.5 | Jan 1916 | Operating | — | coming soon |
| SW04 | Conventional Hydroelectric | HY | 0.6 | 0.6 | Jan 1929 | Operating | — | coming soon |
Owner / operator
Operator: Brookfield Black Bear Hydro, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Brookfield Black Bear Hydro, LLC | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Stillwater B | 2 MW | 0.4 km |
| Orono B | 4 MW | 3.2 km |
| Orono Hydro Station | 3 MW | 3.6 km |
| Red Shield Envir Old Town Facility | 29 MW | 3.9 km |
| Milford Hydro Station | 8 MW | 4.7 km |
| ME CDG 005 | 2 MW | 7.7 km |