Gulf Island
Androscoggin County, Maine · EIA plant ID 1491 · Operator: Brookfield White Pine Hydro LLC
Nameplate19MWSummer 23 MW
Generators3in service
Net generation115GWh12 mo to Dec 2025
Capacity factor57%hydro units, summer MW
Heat rate—thermal plants only
First online1926
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 | 123 | 77.0% | — |
| 2002 | 156.2 | 63.9% | — |
| 2003 | 181.5 | 74.3% | — |
| 2004 | 198.3 | 80.9% | — |
| 2005 | 217.9 | 96.4% | — |
| 2006 | 165.6 | 75.9% | — |
| 2007 | 133.3 | 61.1% | — |
| 2008 | 167.2 | 82.0% | — |
| 2009 | 149.1 | 73.4% | — |
| 2010 | 142.1 | 69.9% | — |
| 2011 | 155.2 | 76.3% | — |
| 2012 | 146.1 | 71.7% | — |
| 2013 | 125.8 | 61.9% | — |
| 2014 | 141.9 | 69.8% | — |
| 2015 | 130.2 | 64.1% | — |
| 2016 | 121.4 | 59.6% | — |
| 2017 | 135 | 66.4% | — |
| 2018 | 141.5 | 69.6% | — |
| 2019 | 147.3 | 72.5% | — |
| 2020 | 138.4 | 67.9% | — |
| 2021 | 105.3 | 51.8% | — |
| 2022 | 126.3 | 62.2% | — |
| 2023 | 169.3 | 83.3% | — |
| 2024 | 136.3 | 66.9% | — |
| 2025 | 115 | 56.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GI1 | Conventional Hydroelectric | HY | 6.4 | 7.2 | Jan 1926 | Operating | — | coming soon |
| GI2 | Conventional Hydroelectric | HY | 6.4 | 8.1 | Jan 1926 | Operating | — | coming soon |
| GI3 | Conventional Hydroelectric | HY | 6.4 | 7.9 | Jan 1926 | Operating | — | coming soon |
Owner / operator
Operator: Brookfield White Pine Hydro LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Brookfield White Pine Hydro LLC | 100.0% | 19 MW |
Nearby plants
Within 80 km.
| Merrill Road Solar | 5 MW | 1.1 km |
| Androscoggin 3 | retired | 2 km |
| Deer Rips | 7 MW | 2.1 km |
| Charles E Monty | 28 MW | 6 km |
| Upper Androscoggin | 2 MW | 7.2 km |
| Upper Barker | 1 MW | 7.5 km |