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20 MW BESS operating in San Bernardino, CA
20 MW
Nameplate Capacity
2
Generators
units
Batteries
Technology
2016
Operating Since
Coordinates
34.0046, -117.5600
County
San Bernardino, CA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Southern California Edison Co | Southern California Edison | — |
| Owner(s) | Southern California Edison Co | Edison International | — |
| Status | Operating | — | — |
The Mira Loma Energy Storage Facility is a 20 MW battery energy storage system (BESS) located in San Bernardino County, California. The plant, which began operating in 2016, is owned by Edison International and operated by Southern California Edison (SCE). It consists of two generators utilizing lithium-ion battery (LIB) technology. The facility has a total storage capacity of 40 MWh, providing a duration of 4 hours at its full power output.
The Mira Loma facility operates within the California Independent System Operator (CAISO) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. It is ranked as the 183rd largest power plant in California out of 300, and 693rd nationally out of 1205. The plant's primary fuel is listed as "MWH", indicating that it draws power from the grid to charge its batteries.
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
12.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
−121 MWh
Net Charging
-1.9K MWh
Annual Net Energy
-1.1%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
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2016
$1,763/kW
Est. Construction Cost
Total estimated cost: $35.3M
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Point of Interconnection
Nearest Substation
Mira Loma Substation · 500 kV
Substation Distance
0.431 km
Operator
Southern California Edison
Coord Source
OSM spatial
Market Position
ISO/RTO Market
CAISO
LMP Node
MIRALOMA_6_N001
Pricing Hub
TH_SP15_GEN-APND
Location Type
Pricing Node
Node Source
Curated node 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.
Last updated 2026-03-26
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