How many battery storage projects are in ISO-NE?

There are 150 operating battery storage projects in ISO-NE.

What is the total battery storage capacity in ISO-NE?

The total operating battery storage capacity in ISO-NE is 1,016 MW.

What is the largest battery storage project in ISO-NE?

The largest battery storage project in ISO-NE is Medway Grid at 250 MW, located in Norfolk, Massachusetts.

How many battery storage projects were built in ISO-NE in 2025?

9 battery storage projects were built in ISO-NE in 2025.

How many developers have battery storage projects in ISO-NE?

There are 11 unique developers with operating battery storage projects in ISO-NE.

Battery Storage Projects in ISO-NE

Explore the largest battery storage projects in ISO-NE and see all the utility-scale battery storage projects in ISO-NE on a map.

Last updated: May 2026

On this page, you can explore our real-time database of battery storage projects in ISO-NE. Each month, we track battery storage projects and update our list of the largest battery storage projects in ISO-NE.

As of May 2026, there are 150 utility-scale battery storage projects in ISO-NE, according to Cleanview's project tracker. Their total operating capacity is 1,016 MW. In 2025, there were 9 battery storage projects built in ISO-NE. See also: planned battery storage projects in ISO-NE→

Total Battery Storage Projects

150

Total Capacity

1,016 MW

Built in 2025

ISO-NE Battery Storage Map

Map of battery storage projects in ISO-NE. Marker size reflects capacity — only facilities with reported capacity data are shown.

Largest Battery Storage Projects in ISO-NE

Medway Grid

250 MW

Year Operational: March 2026

Location: Norfolk, Massachusetts

Developer: Eolian Energy

Cross Town Energy Storage

175 MW

Year Operational: November 2025

Location: Cumberland, Maine

Developer: Plus Power

Cranberry Point Energy Storage

150 MW

Year Operational: May 2025

Location: Plymouth, Massachusetts

Developer: Plus Power

Outer Cape Community Battery

25 MW

Year Operational: December 2022

Location: Barnstable, Massachusetts

Great Lakes Hydro America - ME

20 MW

Year Operational: December 2020

Location: Penobscot, Maine

William F Wyman Hybrid

17 MW

Year Operational: December 2016

Location: Cumberland, Maine

Berlin Gorham

14 MW

Year Operational: December 2023

Location: Coos, New Hampshire

Rumford Falls Hydro Facility

8 MW

Year Operational: May 2023

Location: Oxford, Maine

Bonny Eagle

8 MW

Year Operational: April 2023

Location: York, Maine

Recently Built Battery Storage Projects in ISO-NE

Medway Grid

250 MW

Year Operational: March 2026

Location: Norfolk, Massachusetts

Developer: Eolian Energy

Cross Town Energy Storage

175 MW

Year Operational: November 2025

Location: Cumberland, Maine

Developer: Plus Power

NL MA - Division

1 MW

Year Operational: September 2025

Location: Bristol, Massachusetts

Developer: Standard Solar

Wakefield MA BESS 1

5 MW

Year Operational: August 2025

Location: Middlesex, Massachusetts

Developer: Unable to find

Upland

2 MW

Year Operational: June 2025

Location: Plymouth, Massachusetts

Developer: Greenbacker

Ring Road

2 MW

Year Operational: June 2025

Location: Plymouth, Massachusetts

Developer: Greenbacker

Cranberry Point Energy Storage

150 MW

Year Operational: May 2025

Location: Plymouth, Massachusetts

Developer: Plus Power

Kearsarge Riverpark I LLC

5 MW

Year Operational: May 2025

Location: Middlesex, Massachusetts

Developer: Kearsarge Energy

Kearsarge Riverpark II LLC

5 MW

Year Operational: May 2025

Location: Middlesex, Massachusetts

Developer: Kearsarge Energy

Frequently Asked Questions

How many battery storage projects are in ISO-NE?: There are 150 operating battery storage projects in ISO-NE.
What is the total battery storage capacity in ISO-NE?: The total operating battery storage capacity in ISO-NE is 1,016 MW.
What is the largest battery storage project in ISO-NE?: The largest battery storage project in ISO-NE is Medway Grid at 250 MW, located in Norfolk, Massachusetts.
How many battery storage projects were built in ISO-NE in 2025?: 9 battery storage projects were built in ISO-NE in 2025.
How many developers have battery storage projects in ISO-NE?: There are 11 unique developers with operating battery storage projects in ISO-NE.

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