Battery Storage
BetaActiveBatteryISO-NELBNL + Live
508.248 MW storage in Middlesex, MA · In queue since June 2021 · Proposed COD May 2028
508.248 MW
Capacity
1
Components
Battery
4y 9m
In Queue
IA Executed
IA Status
COD target: 2028
Interconnection Timeline
Total Duration
6y 11m
Construction75%
Queue EntryJun 15, 2021
Interconnection request submitted to ISO/RTO
TCS Study
ISO-NE is transitioning to cluster studies per FERC Order 2023.
Typical: 25–30 months (recent)
Interconnection Agreement
Interconnection agreement executed — binding commitment to build
Typical: 30–60 days (negotiation)
ConstructionCurrent
Project under construction
Typical: 6–18 months
Commercial Operation
Proposed COD: 2028-05-31
Project Details
State
MA
County
Middlesex
Region
ISO-NE
Developer
—
Utility
ISO-NE
Entity
ISO-NE
Point of Interconnection
Mystic 345 kV between breaker 101, 106 and 107
Data Source
LBNL + Live
No news available for this project.