Messalonskee 5
Kennebec County, Maine · EIA plant ID 1500 · Operator: Messalonskee Stream Hydro LLC
Nameplate2MWSummer 2 MW
Generators1in service
Net generation4GWh12 mo to Dec 2025
Capacity factor22%hydro units, summer MW
Heat rate—thermal plants only
First online1935
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% | — |
| 2010 | 3 | 18.9% | — |
| 2011 | 6.7 | 42.8% | — |
| 2012 | 4.4 | 27.7% | — |
| 2013 | 6.5 | 41.3% | — |
| 2014 | 7.2 | 45.7% | — |
| 2015 | 4.8 | 30.6% | — |
| 2016 | 4.2 | 26.4% | — |
| 2017 | 5.5 | 35.0% | — |
| 2018 | 4.7 | 29.6% | — |
| 2019 | 6.3 | 39.9% | — |
| 2020 | 3 | 18.7% | — |
| 2021 | 1.9 | 12.2% | — |
| 2022 | 4.3 | 27.4% | — |
| 2023 | 5.1 | 32.6% | — |
| 2024 | 3.3 | 20.9% | — |
| 2025 | 3.5 | 22.2% | — |
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 | 1.8 | 1.8 | Jan 1935 | 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.
| Cenergy - Waterville (CSG) | 5 MW | 1.4 km |
| Broadhead | 5 MW | 2.3 km |
| Lockwood Hydroelectric Facility | 7 MW | 2.3 km |
| Solar Mule, LLC | 2 MW | 3 km |
| Winslow PV, LLC | 4 MW | 3.2 km |
| Webb Road Solar | 5 MW | 3.6 km |