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103.6 MW Hydro operating in Tuolumne, CA — California Independent System Operator
103.6 MW
Nameplate Capacity
2
Generators
units
Conventional Hydroelectric
Technology
1969
Operating Since
Coordinates
37.8094, -120.2993
County
Tuolumne, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | City & County of San Francisco - (CA) | City & County of San Francisco | — |
| Owner(s) | City & County of San Francisco | City & County of San Francisco | — |
| Status | Operating | operating | — |
GEM identifies the owner as City & County of San Francisco
This entity is not yet in the GEM ownership database — chain unavailable.
Moccasin is a 96.8 MW hydroelectric power plant located in Tuolumne County, California. The plant began operating in 1969 and consists of two generators utilizing conventional hydroelectric technology. It is owned and operated by the City & County of San Francisco. Moccasin is connected to the California Independent System Operator (CAISO) balancing authority and resides within the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year of reported data, Moccasin generated 276,555 MWh of electricity, achieving a capacity factor of 32.5%. The plant is the 44th largest in California out of 247 facilities and ranks 198th nationally out of 1464 power plants. Its primary fuel source is water (WAT).
Generated from EIA, GEM, and public data sources
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
5.4K MWh
Latest Month
276.6K MWh
Annual Generation
32.5%
Capacity Factor
2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $237.7M
Market Position
ISO/RTO Market
CAISO
LMP Node
INTKEP_2_UNITS-APND
Pricing Hub
TH_NP15_GEN-APND
Location Type
Aggregated Node
Node Source
EIA-860 direct report
Last updated 2026-03-14
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ask pi about MoccasinCalifornia Independent System Operator (CISO)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Municipal
Sector
Electric Utility