IP-661
1,000 MW hybrid in Sweetwater, WY · In queue since June 2022 · Proposed COD December 2025
1,000 MW
Capacity
1
Components
Solar
3y 11m
In Queue
IA Executed
IA Status
Signed Sep 2023
Queue → IA
1y 3m
IA → COD
2y 3m
Total Duration
1y 3m
Interconnection request submitted to ISO/RTO
Project undergoes interconnection studies to assess grid impact.
Typical: 18–36 months
Interconnection agreement executed — binding commitment to build
Typical: 30–60 days (negotiation)
Construction pending
Typical: 18–30 months
Proposed COD: 2025-12-31
IP-661 is a proposed 1000 MW hybrid solar and battery project located in Sweetwater County, Wyoming. The development project, sponsored by Sawtooth DevCo, LLC, is interconnected to Idaho Power Company via the JBRG 345kV Substation. The project entered the IP interconnection queue on June 16, 2022, with a proposed commercial operation date of December 31, 2025.
The interconnection agreement for IP-661 was executed on September 12, 2023. The project's interconnection status is currently listed as suspended. Recent news coverage has discussed the project.
Generated from interconnection queue and public data sources
State
WY
County
Sweetwater
Grid Region
Mountain West
Market
—
Developer
Sawtooth DevCo, LLC
Utility
Idaho Power Company
Entity
IP
Service Type
—
Point of Interconnection
JBRG 345kV Substation
Data Source
LBNL
- ISO / RTO
- MOUNTAIN_WEST
- Trading Hub
- FOURCORNERS
- 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.
