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10 MW BESS operating in Tuolumne, CA — California Independent System Operator
10 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2025
Operating Since
Coordinates
37.8744, -120.4774
County
Tuolumne, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Engie North America | — | — |
| Owner(s) | Enel Green Power NA, Inc., Pacific Ultrapower Chinese Station | — | — |
| Status | Operating | — | — |
Sierra Energy Storage, LLC, is a 10 MW battery energy storage system located in Tuolumne County, California. The plant, identified by the EIA plant code 61803, is operated by Engie North America. It consists of a single generator utilizing batteries as its energy source (MWH).
The facility is located within the California Independent System Operator (CAISO) balancing authority area and the Western Electricity Coordinating Council (WECC) NERC region. Based on total capacity, Sierra Energy Storage ranks as the 208th largest power plant in California out of 300, and 777th nationally out of 1205.
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
$1,361/kW
Est. Construction Cost
Total estimated cost: $13.6M
Market Position
ISO/RTO Market
CAISO
LMP Node
CHSTN_7_B1
Pricing Hub
TH_NP15_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
Last updated 2026-03-26
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ask pi about Sierra Energy Storage, LLCCalifornia Independent System Operator (CISO)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP