Acton-Boxborough Schools BESS
Battery storage project in Middlesex County, Massachusetts. 2.1 MW of nameplate capacity across 1 generator, operated by MSS Energy Holdings, LLC (d.b.a. Calibrant Energy).
Also known as EIA plant 66966
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 2.1 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- May 2021First generator online
- Operator
- MSS Energy Holdings, LLC (d.b.a. Calibrant Energy)EIA operator ID 67085
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- None linkedNo verified ISO node
- Location
- Middlesex County, MA42.4796, −71.4581
- EIA plant ID
- 66966EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Acton-Boxborough Schools BESS produces
Free · EIA-923Net generation, 2025
−148 MWh
−148 MWh, final
Battery discharge, 2025
558 MWh
Charge 706 MWh
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2024 to 2025
−148.0–−100.0
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 | −100 | Not reported | 12 of 12 |
| 2025 | −148 | 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 accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
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 |
|---|---|---|---|
| ABRSD | Batteries | 2.1 | May 2021 |
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 MSS Energy Holdings, LLC (d.b.a. Calibrant Energy) 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 Acton-Boxborough Schools BESS
More plants operated by MSS Energy Holdings, LLC (d.b.a. Calibrant Energy)
Questions about Acton-Boxborough Schools BESS
How much power does Acton-Boxborough Schools BESS produce?
Acton-Boxborough Schools BESS reported −148 MWh (−148 MWh) of net generation in 2025.
Where is Acton-Boxborough Schools BESS?
Acton-Boxborough Schools BESS is in Middlesex County, Massachusetts, at 42.4796, −71.4581. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Acton-Boxborough Schools BESS?
EIA-860M for August 2026 lists MSS Energy Holdings, LLC (d.b.a. Calibrant Energy) as the operator (EIA operator ID 67085). The operator is not always the owner.
When did Acton-Boxborough Schools BESS start operating?
Its first generator began operating in May 2021, according to EIA-860M.
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)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page