NWMT-435
800 MW hybrid in Rosebud, MT · In queue since November 2022 · Proposed COD December 2025
800 MW
Capacity
1
Components
Solar
3y 6m
In Queue
Facility Study
IA Status
COD target: 2025
Total Duration
3y 1m
Schedule
5 months past proposed COD
Interconnection request submitted to ISO/RTO
Project undergoes interconnection studies to assess grid impact.
Typical: 18–36 months
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2025-12-01
The NWMT-435 development project is a proposed 800 MW solar and battery hybrid project located in Rosebud County, Montana. The project, which interconnects with NorthWestern Energy via the Colstrip 500kV Substation, entered the NWMT interconnection queue on November 4, 2022, with a proposed commercial operation date of December 1, 2025.
The project's interconnection status is currently in the Facility Study phase. The hybrid project consists of 800 MW of solar generation capacity. The project has appeared in recent news coverage regarding renewable energy development in Montana.
Generated from interconnection queue and public data sources
State
MT
County
Rosebud
Grid Region
Mountain West
Market
—
Developer
—
Utility
NorthWestern Energy
Entity
NWMT
Service Type
—
Point of Interconnection
Colstrip 500kV Substation
Data Source
LBNL
- ISO / RTO
- MOUNTAIN_WEST
- Trading Hub
- MID-C
- Hub Confidence
- UNKNOWN
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.
