IP-661
1,000 MW hybrid in Sweetwater, WY · In queue since June 2022 · Proposed COD December 2027
1,000 MW
Capacity
1
Components
Solar
4y 1m
In Queue
IA Executed
IA Phase
Signed Sep 2023
Queue → IA
1y 3m
IA → COD
4y 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: 2027-12-01
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
Realization risk from now to commercial operation — financing close, EPC and tax-equity counterparty mix, and COD probability vs the proposed date. The diligence view that determines whether the deal actually closes. Powered by InfraSure's development-stage modeling stack.
See the full development-risk decomposition for this project.
State
WY
County
Sweetwater
Grid Region
Mountain West
Market
—
Developer
Sawtooth DevCo, LLC
Utility
Idaho Power Company
Entity
IP
Service Type
ERIS
Point of Interconnection
JBRG 345kV Substation
Data Source
LBNL
Composite operating-phase risk view — what this asset's risk profile will look like once it commissions. 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 — first-year production estimate and 10-year P50 trajectory, with probabilistic ranges (P10/P50/P90) across weather, demand, and policy scenarios. 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. First-year DSCR, 10-year cashflow, and counterparty exposure across price and policy scenarios. Powered by InfraSure's asset cashflow stack.
See the full revenue + DSCR projection for this project.
- 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.
Top solar plant owners in the US
Data tables and metrics from the InfraSure database.
Top solar plant owners in the US
Data tables and metrics from the InfraSure database.
Top 10 solar states
Data tables and metrics from the InfraSure database.
Forward forecasts, scenario decomposition, and risk-decision tooling for this queue project.
