How many planned battery storage projects are in Maine?

There are 2 planned battery storage projects in Maine.

What is the total planned battery storage capacity in Maine?

The total planned battery storage capacity in Maine is 15 MW.

What is the largest planned battery storage project in Maine?

The largest planned battery storage project in Maine is South Portland ESS, LLC at 10 MW, located in Cumberland, Maine.

How many developers have planned battery storage projects in Maine?

There are 2 unique developers with planned battery storage projects in Maine.

Planned Battery Storage Projects in Maine

Explore the largest battery storage projects expected to come online in Maine and see all proposed battery storage projects on a map.

Last updated: May 2026

On this page, you can explore our database of planned battery storage projects in Maine. Each month, we track projects in development and update our list of the largest battery storage projects expected to come online in Maine.

As of May 2026, there are 2 battery storage projects in development in Maine, according to Cleanview's project tracker. Their total planned capacity is 15 MW. See also: operating battery storage projects in Maine→

Planned Projects

Planned Capacity

15 MW

Unique Developers

Planned Maine Battery Storage Map

Map of planned battery storage projects in Maine. Marker size reflects planned capacity.

Largest Planned Battery Storage Projects in Maine

South Portland ESS, LLC

10 MWExpected Online: December 2026Location: Cumberland, MaineDeveloper: South Portland ESS

Sanford ESS, LLC

5 MWExpected Online: December 2026Location: York, MaineDeveloper: Energy Management

Battery Storage Projects Coming Online Soon in Maine

South Portland ESS, LLC

10 MWExpected Online: December 2026Location: Cumberland, MaineDeveloper: South Portland ESS

Sanford ESS, LLC

5 MWExpected Online: December 2026Location: York, MaineDeveloper: Energy Management

Frequently Asked Questions

How many planned battery storage projects are in Maine?: There are 2 planned battery storage projects in Maine.
What is the total planned battery storage capacity in Maine?: The total planned battery storage capacity in Maine is 15 MW.
What is the largest planned battery storage project in Maine?: The largest planned battery storage project in Maine is South Portland ESS, LLC at 10 MW, located in Cumberland, Maine.
How many developers have planned battery storage projects in Maine?: There are 2 unique developers with planned battery storage projects in Maine.

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