Marathon BESS
135 MW storage in Suffolk, NY · In queue since September 2024 · Proposed COD October 2029
135 MW
Capacity
1
Components
Battery
1y 8m
In Queue
—
IA Status
COD target: 2029
Total Duration
5y 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 not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2029-10-01
The Marathon BESS project is a proposed 135 MW battery storage project located in Suffolk County, New York. Developed by Marathon Power, the project is interconnected to the Long Island Power Authority (LIPA) via the Greenlawn 138kV point of interconnection. The project entered the New York Independent System Operator (NYISO) interconnection queue as queue ID NYISO-C24-138 on September 6, 2024, and has a proposed commercial operation date of October 1, 2029.
The development project consists entirely of battery storage, with a total capacity of 135 MW. The project is currently listed as active in the NYISO interconnection queue. The Marathon BESS project has appeared in recent news coverage regarding energy storage projects on Long Island.
Generated from interconnection queue and public data sources
State
NY
County
Suffolk
Grid Region
NYISO (New York)
Market
ISO/RTO Member
Developer
Marathon Power
Utility
LIPA
Entity
NYISO
Service Type
—
Point of Interconnection
Greenlawn 138kV
Data Source
LBNL + Live
- ISO / RTO
- NYISO
- Trading Hub
- ZONE K
- Hub Confidence
- MEDIUM
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.
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