SOLAR STAR 4
50 MW hybrid in Kern, CA · In queue since May 2016 · Proposed COD August 2026
50 MW
Capacity
2
Components
Solar + Battery
10 years
In Queue
IA Executed
IA Status
Signed Oct 2019
Queue → IA
3y 5m
IA → COD
6y 10m
Total Duration
3y 5m
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 executed — binding commitment to build
Typical: 30–60 days (negotiation)
Project under construction
Typical: 18–30 months
Proposed COD: 2026-08-12
The SOLAR STAR 4 project is a proposed 50 MW hybrid solar and battery energy storage project located in Kern County, California. The development project, consisting of 25.05 MW of solar capacity and 24.95 MW of battery storage, is interconnected to the CAISO grid via Southern California Edison (SCE) at the Whirlwind Substation 230kV.
The project, identified as CAISO-1323 in the CAISO interconnection queue, entered the queue on May 2, 2016, and has a proposed commercial operation date of August 12, 2026. An Interconnection Agreement (IA) was executed on October 11, 2019. The SOLAR STAR 4 project has been the subject of recent news coverage.
Generated from interconnection queue and public data sources
State
CA
County
Kern
Grid Region
CAISO (California)
Market
ISO/RTO Member
Developer
—
Utility
SCE
Entity
CAISO
Service Type
—
Point of Interconnection
Whirlwind Substation 230kV
Data Source
LBNL + Live
- ISO / RTO
- CAISO
- Trading Hub
- TH_SP15_GEN-APND
- Hub Confidence
- MEDIUM
- Nearest Node (Estimated)
- ASTORIA2_7_N001
- POI Substation
- Whirlwind Substation
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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