SIENNA SOLAR FARM
400 MW hybrid in San Bernardino, CA · In queue since April 2015 · Proposed COD January 2027
400 MW
Capacity
2
Components
Solar + Battery
11y 3m
In Queue
IA Executed
IA Phase
Signed Nov 2017
Queue → IA
2y 7m
IA → COD
9y 2m
Total Duration
2y 7m
Study Phase
C08
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: 2027-01-28
The Sienna Solar Farm is a proposed 400 MW hybrid solar and battery project located in San Bernardino County, California. The development project consists of 200 MW of solar capacity coupled with 200 MW of battery storage. Interconnection for the project is being managed through the CAISO queue under queue ID CAISO-1207. The project entered the queue on April 30, 2015, and has a proposed commercial operation date of January 28, 2027.
The project has an executed Interconnection Agreement (IA), dated November 7, 2017. The point of interconnection (POI) is the Calcite Substation at 230kV, and the interconnecting utility is Southern California Edison (SCE). The Sienna Solar Farm has been the subject of recent news coverage related to regulatory matters.
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
San Bernardino
Grid Region
CAISO (California)
Market
ISO/RTO Member
Developer
—
Utility
SCE
Entity
CAISO
Service Type
NRIS
Point of Interconnection
Calcite 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_ZP26_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.
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Ask about SIENNA SOLAR FARMForward forecasts, scenario decomposition, and risk-decision tooling for this queue project.
