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60 MW BESS operating in Monterey, CA — California Independent System Operator
60 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2021
Operating Since
Coordinates
35.8667, -120.3294
County
Monterey, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Arevon Energy, Inc. | — | — |
| Owner(s) | Arevon Energy, Inc. | — | — |
| Status | Operating | — | — |
Cal Flats BESS is a 60 MW battery energy storage system located in Monterey County, California. The plant began operating in 2021 and is owned and operated by Arevon Energy, Inc. It is interconnected to the California Independent System Operator (CAISO) balancing authority within the Western Electricity Coordinating Council (WECC) NERC region. The facility consists of a single generator utilizing battery technology with a total storage capacity of 242 MWh, yielding a duration of approximately 4.03 hours. The battery chemistry is lithium-ion (LIB).
Cal Flats BESS is ranked as the 145th largest power plant in California out of 300, and 584th nationally out of 1205. The plant's primary fuel is listed as "MWH," indicating 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
−656 MWh
Net Charging
-11.0K MWh
Annual Net Energy
-2.1%
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.
2021
$1,796/kW
Est. Construction Cost
Total estimated cost: $107.8M
Market Position
ISO/RTO Market
CAISO
LMP Node
C877P2C2_7_N001
Pricing Hub
TH_ZP26_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
Last updated 2026-03-26
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ask pi about Cal Flats BESSCalifornia Independent System Operator (CISO)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP