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47 MW BESS operating in Kern, CA — California Independent System Operator
47 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2023
Operating Since
Coordinates
34.9581, -118.1078
County
Kern, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Terra-Gen Operating Co-BESS | — | — |
| Owner(s) | EdSan 1B Group 2, LLC | — | — |
| Status | Operating | — | — |
Sanborn BESS 4 is a 47 MW battery energy storage system located in Kern County, California. The plant began operating in 2023 and has one generator. It is owned and operated by Terra-Gen Operating Co-BESS. The facility utilizes lithium-ion (LIB) batteries with a total storage capacity of 188 MWh, providing a duration of 4 hours.
The plant operates within the California Independent System Operator (CAISO) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. Sanborn BESS 4 ranks as the 159th largest power plant in California out of 300, and 622nd 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
−1.8K MWh
Net Charging
-10.0K MWh
Annual Net Energy
-2.4%
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.
2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $64.0M
Market Position
ISO/RTO Market
CAISO
LMP Node
—
Pricing Hub
TH_SP15_GEN-APND
Node Source
Shared substation inference
Last updated 2026-03-26
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ask pi about Sanborn BESS 4California Independent System Operator (CISO)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP