Messalonskee 3
Kennebec County, Maine · EIA plant ID 1498 · Operator: Messalonskee Stream Hydro LLC
Nameplate2MWSummer 2 MW
Generators1in service
Net generation4GWh12 mo to Dec 2025
Capacity factor27%hydro units, summer MW
Heat rate—thermal plants only
First online1918
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 | -0 | -0.0% | — |
| 2002 | -0 | -0.1% | — |
| 2003 | -0 | -0.2% | — |
| 2004 | 0 | 0.0% | — |
| 2005 | 0 | 0.0% | — |
| 2006 | 7.4 | 52.6% | — |
| 2007 | 5.2 | 37.0% | — |
| 2008 | 8.8 | 62.7% | — |
| 2009 | 7.2 | 51.6% | — |
| 2010 | 3 | 21.7% | — |
| 2011 | 6.8 | 48.7% | — |
| 2012 | 4.4 | 31.3% | — |
| 2013 | 6.8 | 48.8% | — |
| 2014 | 7.7 | 54.7% | — |
| 2015 | 5 | 35.5% | — |
| 2016 | 4.3 | 30.4% | — |
| 2017 | 5.6 | 39.8% | — |
| 2018 | 4.9 | 35.1% | — |
| 2019 | 5.4 | 38.2% | — |
| 2020 | 5 | 35.3% | — |
| 2021 | 4.2 | 30.0% | — |
| 2022 | 4.8 | 34.5% | — |
| 2023 | 7.3 | 52.0% | — |
| 2024 | 6.5 | 46.3% | — |
| 2025 | 3.8 | 26.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 1.6 | 1.6 | Jan 1918 | Operating | — | coming soon |
Owner / operator
Operator: Messalonskee Stream Hydro LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Messalonskee Stream Hydro LLC | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Oakland | 5 MW | 0.8 km |
| Solar Mule, LLC | 2 MW | 1.6 km |
| Messalonskee 2 (Oakland) | 3 MW | 3.3 km |
| Cenergy - Waterville (CSG) | 5 MW | 3.6 km |
| Messalonskee 5 | 2 MW | 4.6 km |
| Webb Road Solar | 5 MW | 4.8 km |