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400 MW Batteries (200 MW) + Solar Photovoltaic (200 MW) planned in San Bernardino, CA — California Independent System Operator
400 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
Planned: —
Planned Operation
Coordinates
34.4937, -116.9150
County
San Bernardino, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | 99MT 8me, LLC | — | — |
| Owner(s) | 99MT 8me, LLC | — | — |
| Status | Planned | announced | — |
Sienna Solar Farm is a 400 MW hybrid power plant located in San Bernardino County, California. The plant, identified by the EIA plant code 64632, is owned and operated by 99MT 8me, LLC. It utilizes both solar photovoltaic technology and battery storage. The primary fuel type is listed as MWH, indicating electricity input.
The facility consists of two generators and operates within the California Independent System Operator (CAISO) balancing authority, part of the Western Electricity Coordinating Council (WECC) NERC region. Sienna Solar Farm employs a fixed tilt solar tracking system. It is ranked as the 16th largest solar plant in California out of 112, and 92nd nationally out of 514.
Generated from EIA, GEM, and public data sources
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
No generation data available for this plant.
2023
$1,544/kW
Est. Construction Cost
Total estimated cost: $617.6M
Market Position
ISO/RTO Market
CAISO
LMP Node
—
Pricing Hub
TH_SP15_GEN-APND
Node Source
OSM spatial match
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California Independent System Operator (CISO)
Grid Voltage
220.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP