SADDLE MOUNTAIN SOLAR
189 MW hybrid in Maricopa, AZ · In queue since April 2020 · Proposed COD December 2025
189 MW
Capacity
2
Components
Solar + Battery
6y 1m
In Queue
System Impact Study
IA Status
COD target: 2025
Total Duration
5y 8m
Schedule
4 months past proposed COD
Interconnection request submitted to ISO/RTO
CAISO uses cluster studies where projects are batched annually and studied together.
Typical: 36–48 months (IR to IA)
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2025-12-31
The Saddle Mountain Solar project is a proposed 189 MW hybrid solar and battery energy storage development in Maricopa County, Arizona. The project consists of a 126.9 MW solar array coupled with a 62.1 MW battery energy storage system. Interconnection is being sought through the CAISO queue, with queue ID CAISO-1818, with San Diego Gas & Electric (SDGE) as the utility. The project entered the queue on April 15, 2020, and has a proposed commercial operation date of December 31, 2025. Its interconnection status is currently in the System Impact Study phase.
The Saddle Mountain Solar project has been the subject of recent news coverage, with three articles appearing in industry and regulatory publications.
Generated from interconnection queue and public data sources
State
AZ
County
Maricopa
Grid Region
CAISO (California)
Market
ISO/RTO Member
Developer
—
Utility
SDGE
Entity
CAISO
Service Type
—
Point of Interconnection
Hassayampa Common Bus 500 kV
Data Source
LBNL + Live
- ISO / RTO
- CAISO
- Trading Hub
- TH_SP15_GEN-APND
- Hub Confidence
- LOW
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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