Marathon BESS
135 MW storage in Suffolk, NY · In queue since September 2024 · Proposed COD February 2028
135 MW
Capacity
1
Components
Battery
1y 10m
In Queue
—
IA Status
COD target: 2028
Total Duration
3y 5m
Study Phase
C24
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: 2028-02-01
Queue application submitted to NYISO for 135 MW battery storage in Suffolk County
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
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
Marathon Power
Utility
LIPA
Entity
NYISO
Service Type
—
Point of Interconnection
Greenlawn 138kV
Data Source
LBNL + Live
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
- 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.
No Ask reports yet for this entity.
Ask about Marathon BESSForward forecasts, scenario decomposition, and risk-decision tooling for this queue project.
