Holtsville 138kV Energy Storage
110 MW storage in Suffolk, NY · In queue since December 2019 · Proposed COD September 2026
110 MW
Capacity
1
Components
Battery
6y 5m
In Queue
System Impact Study
IA Status
COD target: 2026
Total Duration
6y 9m
Interconnection request submitted to ISO/RTO
NYISO transitioned to a Transitional Cluster Study (TCS) format in 2024.
Typical: >42 months (historical); ~24 months target
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2026-09-01
The Holtsville 138kV Energy Storage project is a proposed 110 MW battery storage project located in Suffolk County, New York. Developed by Holtsville Energy Storage, LLC, the project is interconnected to the Long Island Power Authority (LIPA) and is in the New York Independent System Operator (NYISO) interconnection queue as queue ID NYISO-956. The project entered the queue on December 10, 2019, and has a proposed commercial operation date of September 1, 2026. Its interconnection status is currently in the System Impact Study phase.
The development project consists of 110 MW of battery storage capacity. The Holtsville 138kV Energy Storage project has been featured in recent industry news.
Generated from interconnection queue and public data sources
State
NY
County
Suffolk
Grid Region
NYISO (New York)
Market
ISO/RTO Member
Developer
Holtsville Energy Storage, LLC
Utility
LIPA
Entity
NYISO
Service Type
—
Point of Interconnection
West Bus 138 kV
Data Source
LBNL
- ISO / RTO
- NYISO
- Trading Hub
- ZONE K
- Hub Confidence
- HIGH
- Nearest Node (Estimated)
- NGRID_A4_DSASP
This project's market context is estimated from its Point of Interconnection. Hub and node assignments are approximate and based on geographic inference from the POI substation name.
Last updated 2026-03-26
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