Errol Hydroelectric Project
Coos County, New Hampshire · EIA plant ID 10570 · Operator: Errol Hydroelectric Co LLC
Nameplate3MWSummer 3 MW
Generators1in service
Net generation14GWh12 mo to Dec 2025
Capacity factor52%hydro units, summer MW
Heat rate—thermal plants only
First online1986
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 | 13.7 | 52.1% | — |
| 2002 | 13.1 | 49.8% | — |
| 2003 | 12.2 | 46.3% | — |
| 2004 | 16.4 | 62.1% | — |
| 2005 | 25.1 | 95.6% | — |
| 2006 | 18.1 | 69.0% | — |
| 2007 | 17.3 | 66.0% | — |
| 2008 | 16.8 | 63.8% | — |
| 2009 | 18.2 | 69.4% | — |
| 2010 | 17.9 | 68.2% | — |
| 2011 | 18.4 | 70.1% | — |
| 2012 | 16.6 | 63.0% | — |
| 2013 | 16 | 61.0% | — |
| 2014 | 16.5 | 62.7% | — |
| 2015 | 16.2 | 61.6% | — |
| 2016 | 15.3 | 58.2% | — |
| 2017 | 17.3 | 65.9% | — |
| 2018 | 14.5 | 55.2% | — |
| 2019 | 12.5 | 47.6% | — |
| 2020 | 14.9 | 56.6% | — |
| 2021 | 9.8 | 37.3% | — |
| 2022 | 13.6 | 51.8% | — |
| 2023 | 16.2 | 61.8% | — |
| 2024 | 15.3 | 58.2% | — |
| 2025 | 13.6 | 51.9% | — |
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 | 3 | 3 | Nov 1986 | Operating | — | coming soon |
Owner / operator
Operator: Errol Hydroelectric Co LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Errol Hydroelectric Co LLC | 100.0% | 3 MW |
Nearby plants
Within 80 km.
| Granite Reliable Power | 99 MW | 16.1 km |
| Pontook Hydro Facility | 11 MW | 19.7 km |
| Aziscohos Hydroelectric Project | 7 MW | 20.1 km |
| Burgess BioPower | 75 MW | 35.2 km |
| Smith (NH) | 15 MW | 35.5 km |
| Lost Nation | 18 MW | 36.2 km |