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 7m
In Queue
System Impact Study
IA Phase
Signed Jan 2023
Queue → IA
3y 1m
IA → COD
3y 8m
Total Duration
3y 1m
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 executed — binding commitment to build
Typical: 30–60 days (negotiation)
Project under construction
Typical: 6–18 months
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
Realization risk before commercial operation — cluster-study clearance, IA timing, counterparty mix, and withdrawal probability vs cohort. The diligence view that determines whether this project is worth pursuing. Powered by InfraSure's development-stage modeling stack.
See the full development-risk decomposition for this project.
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
Composite operating-phase risk view — what this asset's risk profile would look like once it reaches commercial operation. Climate hazards across its operating life, expected generation variability, and offtake counterparty exposure, decomposed into a single decision-grade score. Powered by InfraRisk.
See the full risk decomposition + scenarios for this project.
Forward generation outlook — what this project would produce assuming it reaches commercial operation. Probabilistic ranges (P10/P50/P90) across weather, demand, and policy scenarios, conditioned on the proposed COD. Powered by InfraSure's generation modeling stack.
See the full forecast + scenario decomposition for this project.
Forward revenue, DSCR projection, and financing-close risk — conditioned on commercial operation. The bankability view that determines whether the deal clears its covenants once online. Powered by InfraSure's asset cashflow stack.
See the full revenue + DSCR projection for this project.
- 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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