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 3m
In Queue
IA Executed
IA Phase
Signed Dec 2023
Queue → IA
3y 8m
IA → COD
6y 7m
Total Duration
3y 8m
Study Phase
C13
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
DOE LPO announces $1.8B conditional commitment for compressed air storage project
sourceCalifornia Energy Commission grants final Power Plant License approval
source50 MW offtake agreement signed with California Community Power for portion of 500 MW facility
sourceConstruction contract executed for compressed air storage facility
sourceThe 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
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
CA
County
Kern
Grid Region
CAISO (California)
Market
ISO/RTO Member
Developer
—
Utility
SCE
Entity
CAISO
Service Type
NRIS
Point of Interconnection
Whirlwind Substation 230kV
Data Source
LBNL + Live
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
- 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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Ask about WILLOW ROCK ENERGY STORAGEForward forecasts, scenario decomposition, and risk-decision tooling for this queue project.
