Explore the largest battery storage projects expected to come online in ISO-NE 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 ISO-NE. Each month, we track projects in development and update our list of the largest battery storage projects expected to come online in ISO-NE.
As of May 2026, there are 36 battery storage projects in development in ISO-NE, according to Cleanview's project tracker. Their total planned capacity is 8,327 MW. See also: operating battery storage projects in ISO-NE→
Planned Projects
36
Planned Capacity
8,327 MW
Unique Developers
9
508 MW
Expected Online: May 2028
Location: Middlesex, Massachusetts
Developer: Jupiter Power
500 MW
Expected Online: December 2028
Location: Barnstable, Massachusetts
500 MW
Expected Online: December 2028
Location: Barnstable, Massachusetts
500 MW
Expected Online: April 2028
Location: Middlesex, Massachusetts
500 MW
Expected Online: April 2028
Location: Middlesex, Massachusetts
350 MW
Expected Online: September 2027
Location: Bristol, Massachusetts
300 MW
Expected Online: May 2028
Location: Suffolk, Massachusetts
Developer: Flatiron Energy
300 MW
Expected Online: November 2027
Location: Norfolk, Massachusetts
Developer: Hecate Energy
300 MW
Expected Online: April 2028
Location: Norfolk, Massachusetts
204 MW
Expected Online: February 2027
Location: Worcester, Massachusetts
Developer: Flatiron Energy
170 MW
Expected Online: July 2027
Location: Norfolk, Massachusetts
Developer: ConnectGen
250 MW
Expected Online: August 2027
Location: Suffolk, Massachusetts
Developer: Hecate Energy
350 MW
Expected Online: September 2027
Location: Bristol, Massachusetts
168 MW
Expected Online: September 2027
Location: Bristol, Massachusetts
Developer: Cypress Creek Renewables
300 MW
Expected Online: November 2027
Location: Norfolk, Massachusetts
Developer: Hecate Energy
Cleanview