VULCAN
500 MW hybrid in Maricopa, AZ · In queue since April 2018 · Proposed COD December 2027
500 MW
Capacity
2
Components
Solar + Battery
8y 3m
In Queue
System Impact Study
IA Phase
COD target: 2027
Total Duration
9y 8m
Study Phase
C11
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: 2027-12-31
The VULCAN project is a proposed 253.8 MW hybrid solar and battery energy storage project located in Maricopa County, Arizona. The development project consists of a 225 MW solar array coupled with a 28.8 MW battery. The project is in the California Independent System Operator (CAISO) interconnection queue as entry CAISO-1534, with an original queue entry date of April 16, 2018. The proposed commercial operation date is December 31, 2027.
The interconnection utility is San Diego Gas & Electric (SDGE), and the point of interconnection is the Hassayampa Common Bus 500 kV. The project's interconnection status is currently in the System Impact Study phase. The VULCAN project has been the subject of recent news coverage, with four articles related to regulatory matters, development, deals, and industry news.
Generated from interconnection queue and public data sources
Realization risk before commercial operation — cluster-study clearance, IA timing, counterparty mix, and withdrawal probability vs cohort. The diligence view that determines whether this project is worth pursuing. Powered by InfraSure's development-stage modeling stack.
See the full development-risk decomposition for this project.
State
AZ
County
Maricopa
Grid Region
CAISO (California)
Market
ISO/RTO Member
Developer
—
Utility
SDGE
Entity
CAISO
Service Type
ERIS
Point of Interconnection
Hassayampa Common Bus 500 kV
Data Source
LBNL + Live
Composite operating-phase risk view — what this asset's risk profile would look like once it reaches commercial operation. 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 — what this project would produce assuming it reaches commercial operation. Probabilistic ranges (P10/P50/P90) across weather, demand, and policy scenarios, conditioned on the proposed COD. 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. The bankability view that determines whether the deal clears its covenants once online. 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
- 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.
Last updated 2026-03-26
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