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110 MW Batteries (55 MW) + Solar Photovoltaic (55 MW) planned in San Bernardino, CA
110 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
Planned: —
Planned Operation
Coordinates
34.5067, -116.8901
County
San Bernardino, CA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | 44ST 8ME LLC | — | — |
| Owner(s) | 44ST 8ME LLC | — | — |
| Status | Planned | — | — |
The Sienna 2 Solar and Storage Project is a hybrid power plant located in San Bernardino County, California. The plant has a total capacity of 110 MW and is operated by 44ST 8ME LLC. It utilizes both solar photovoltaic technology and battery storage. The plant consists of two generators and uses a fixed tilt solar tracking system.
Sienna 2 is interconnected to the California Independent System Operator (CAISO) balancing authority and operates within the Western Electricity Coordinating Council (WECC) NERC region. The plant's primary fuel source is electricity (MWH), reflecting its reliance on solar energy and battery storage. In terms of size, Sienna 2 ranks as the 103rd largest plant in California out of 112, and 458th nationally out of 514. Regulatory matters concerning the plant have been the subject of three news articles.
Generated from EIA, GEM, and public data sources
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
California Independent System Operator (CISO)
Grid Voltage
220.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
No generation data available for this plant.
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2023
$1,544/kW
Est. Construction Cost
Total estimated cost: $169.8M
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Market Position
ISO/RTO Market
CAISO
LMP Node
—
Pricing Hub
TH_SP15_GEN-APND
Node Source
OSM spatial match
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
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