WILLOW ROCK ENERGY STORAGE
620 MW hybrid in Kern, CA · In queue since April 2020 · Proposed COD July 2030
620 MW
Capacity
2
Components
Other + Battery
6y 1m
In Queue
IA Executed
IA Status
Signed Dec 2023
Queue → IA
3y 8m
IA → COD
6y 7m
Total Duration
3y 8m
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: 2030-07-01
The Willow Rock Energy Storage project is a proposed 620 MW hybrid energy project in Kern County, California. Interconnecting to Southern California Edison (SCE) via the Whirlwind Substation 230kV, the project consists of a 512 MW "Other" technology component and a 108 MW battery energy storage system. The project is listed in the CAISO interconnection queue as queue ID CAISO-1782, with an initial queue entry date of April 15, 2020.
The proposed commercial operation date is July 1, 2030. The project's interconnection agreement (IA) has been executed as of December 29, 2023. The Willow Rock Energy Storage 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.
Last updated 2026-03-26
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