Rumford ESS
Oxford County, Maine · EIA plant ID 64763 · Operator: Agilitas Energy, LLC
Nameplate5MWSummer 5 MW
Generators1in service
Net generation-0GWh12 mo to Dec 2025
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2021
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), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
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) |
|---|---|---|---|
| 2024 | -0.1 | — | — |
| 2025 | -0.3 | — | — |
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 |
|---|---|---|---|---|---|---|---|---|
| RUM | Batteries | BA | 4.9 | 4.9 | Jun 2021 | Operating | — | coming soon |
Owner / operator
Operator: Agilitas Energy, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Rumford ESS, LLC | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Rumford Power LLC | 275 MW | 0.3 km |
| Mainely Solar (Wyman Hill Solar LLC) | 4 MW | 1.6 km |
| Mead Rumford Cogen | retired | 2.6 km |
| Rumford Cogeneration | 103 MW | 2.8 km |
| Rumford Falls Hydro Facility | 53 MW | 8.9 km |
| RoxWind | 15 MW | 12.1 km |