Madison ESS
Battery storage project in Somerset County, Maine. 4.9 MW of nameplate capacity across 1 generator, operated by Agilitas Energy, Inc..
Also known as EIA plant 64765
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 4.9 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- June 2019First generator online
- Operator
- Agilitas Energy, Inc.EIA operator ID 61514
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- Somerset County, ME44.7930, −69.8760
- EIA plant ID
- 64765EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Madison ESS produces
Free · EIA-923Net generation, 2025
−454 MWh
−454 MWh, final
Battery discharge, 2025
572 MWh
Charge 1.03 GWh
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2024 to 2025
−454.0–−65.0
MWh a year. Low 2025, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | Not reported | Not reported | 0 of 12 |
| 2021 | Not reported | Not reported | 0 of 12 |
| 2022 | Not reported | Not reported | 0 of 12 |
| 2023 | Not reported | Not reported | 0 of 12 |
| 2024 | −65 | Not reported | 12 of 12 |
| 2025 | −454 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Battery plants can report negative net generation, when charging uses more energy than they discharge.
Power prices and basis
Free account · ISONEEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| MESS | Batteries | 4.9 | June 2019 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Agilitas Energy, Inc. as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Madison ESS
More plants operated by Agilitas Energy, Inc.
Questions about Madison ESS
How much power does Madison ESS produce?
Madison ESS reported −454 MWh (−454 MWh) of net generation in 2025.
Where is Madison ESS?
Madison ESS is in Somerset County, Maine, at 44.7930, −69.8760. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Madison ESS?
EIA-860M for August 2026 lists Agilitas Energy, Inc. as the operator (EIA operator ID 61514). The operator is not always the owner.
When did Madison ESS start operating?
Its first generator began operating in June 2019, according to EIA-860M.
Does InfraMap have power prices for Madison ESS?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Madison ESS, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page