Gardiner
Kennebec County, Maine · EIA plant ID 50688 · Operator: KEI (Maine) Power Management (III) LLC
Nameplate1MWSummer 1 MW
Generators1in service
Net generation3GWh12 mo to Dec 2025
Capacity factor36%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 | 3.3 | 32.8% | — |
| 2002 | 4.4 | 44.3% | — |
| 2003 | 4.8 | 47.9% | — |
| 2004 | 5 | 50.2% | — |
| 2005 | 6.3 | 62.9% | — |
| 2006 | 6 | 59.7% | — |
| 2007 | 4.9 | 51.0% | — |
| 2008 | 6.4 | 66.3% | — |
| 2009 | 6.7 | 69.1% | — |
| 2010 | 5 | 57.4% | — |
| 2011 | 5.5 | 63.2% | — |
| 2012 | 5.3 | 60.6% | — |
| 2013 | 6.4 | 72.8% | — |
| 2014 | 6.7 | 76.9% | — |
| 2015 | 4.3 | 49.4% | — |
| 2016 | 4.1 | 46.4% | — |
| 2017 | 4.7 | 54.1% | — |
| 2018 | 3.7 | 42.4% | — |
| 2019 | 5.3 | 60.4% | — |
| 2020 | 4.3 | 48.9% | — |
| 2021 | 3.7 | 41.9% | — |
| 2022 | 4.5 | 51.7% | — |
| 2023 | 6.7 | 76.1% | — |
| 2024 | 4.3 | 48.9% | — |
| 2025 | 3.2 | 36.0% | — |
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 | 1 | Jul 1985 | Operating | — | coming soon |
Owner / operator
Operator: KEI (Maine) Power Management (III) LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| KEI (Maine) Power Management (III) LLC | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Gardiner A, LLC | 4 MW | 0.7 km |
| RE Gardiner Solar, LLC | 4 MW | 2.3 km |
| Farmingdale FA01 | 5 MW | 3.1 km |
| Water Street Solar | 5 MW | 3.4 km |
| Market Street Gardiner Solar, LLC | 3 MW | 5.1 km |
| Town House | 5 MW | 7.3 km |