Arch 4
150 MW storage in Orange, NY · In queue since August 2024 · Proposed COD December 2028
150 MW
Capacity
1
Components
Battery
1y 9m
In Queue
—
IA Status
COD target: 2028
Total Duration
4y 4m
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: 2028-12-01
Arch 4 is a proposed 150 MW battery storage project located in Orange County, New York. Developed by Terra-Gen Development, LLC, the project consists of 150 MW of battery capacity. It is interconnected to the Central Hudson Gas & Electric (CHGE) grid at the Rock Tavern 345kV Substation.
The project is currently active in the New York Independent System Operator (NYISO) interconnection queue as entry NYISO-C24-085, with a queue entry date of August 9, 2024. Its proposed commercial operation date is December 1, 2028. The Arch 4 project has been the subject of recent news coverage.
Generated from interconnection queue and public data sources
State
NY
County
Orange
Grid Region
NYISO (New York)
Market
ISO/RTO Member
Developer
Terra-Gen Development, LLC
Utility
CHGE
Entity
NYISO
Service Type
—
Point of Interconnection
Rock Tavern 345kV Substation
Data Source
LBNL + Live
- ISO / RTO
- NYISO
- Trading Hub
- ZONE G
- Hub Confidence
- HIGH
- POI Substation
- Rock Tavern Substation (115kV)
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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