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
NERC Region
WECC
Balancing Authority
California Independent System Operator
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
−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.
No financial data available for this plant.
Market Position
ISO/RTO Market
CAISO
LMP Node
—
Pricing Hub
TH_SP15_GEN-APND
Node Source
Shared substation inference
How mega batteries are unlocking an energy revolution
As the evening drew in on a sweltering mid-August day in 2020, California's strained electricity grid buckled. Amid an intense heatwave,...
Top 5: Largest BESS Projects in the World in 2025
Of the top 5 largest BESS projects, 4 are from the US. This Middle Eastern Nation made it to the list with its 500 GW / 2000 MWh project.
LG Energy Solution’s system integrator arm signs 8GWh BESS deal with Terra-Gen
The US battery storage system integrator arm of Korean battery manufacturer LG Energy Solution (LG ES) has signed a 4-year supply deal with developer Terra-Gen.
Calpine to bring majority of 680MW California BESS online this summer
Gas and geothermal plant operator Calpine Corporation will bring 510MW of its 680MW capacity battery energy storage system (BESS) project in...
Last updated 2026-03-14
View all 9 articles