WILLOW SPRINGS SOLAR 4
75 MW storage in Kern, CA · In queue since April 2015 · Proposed COD June 2026
75 MW
Capacity
1
Components
Battery
11y 1m
In Queue
IA Executed
IA Status
Signed Nov 2018
Queue → IA
3y 7m
IA → COD
7y 7m
Total Duration
3y 7m
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: 6–18 months
Proposed COD: 2026-06-01
The Willow Springs Solar 4 project is a proposed 75 MW battery storage project located in Kern County, California. Interconnecting to Southern California Edison (SCE), the project is in the CAISO queue as entry CAISO-1217, with a queue entry date of April 30, 2015. The proposed commercial operation date is June 1, 2026.
The project has an executed Interconnection Agreement (IA), dated November 20, 2018. The point of interconnection (POI) is the Whirlwind Substation 230kV. The Willow Springs Solar 4 project has been mentioned in 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.
Last updated 2026-03-26
View all articlesNo ask pi reports yet for this entity.
ask pi about WILLOW SPRINGS SOLAR 4
