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29.9 MW Hydro operating in Tuolumne, CA — California Independent System Operator
29.9 MW
Nameplate Capacity
3
Generators
units
Conventional Hydroelectric
Technology
1958
Operating Since
Coordinates
37.8763, -120.6052
County
Tuolumne, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Oakdale&South San Joaquin Irrigation D. | — | — |
| Owner(s) | Oakdale&South San Joaquin Irrigation D. | — | — |
| Status | Operating | — | — |
Tulloch is a hydroelectric power plant located in Tuolumne County, California. The plant has a total capacity of 29.9 MW, distributed across three generators utilizing conventional hydroelectric technology. Tulloch began operating in 1958 and is currently owned and operated by Oakdale & South San Joaquin Irrigation District. The plant is interconnected 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 with available data, Tulloch generated 103,604 MWh of electricity, achieving a capacity factor of 39.4%. Tulloch ranks as the 82nd largest power plant in California out of 247 facilities and is ranked 413th nationally out of 1464 plants.
Generated from EIA, GEM, and public data sources
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
1.1K MWh
Latest Month
103.6K MWh
Annual Generation
39.4%
Capacity Factor
2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $68.6M
Market Position
ISO/RTO Market
CAISO
LMP Node
TULLCK_7_UNITS-APND
Pricing Hub
TH_NP15_GEN-APND
Location Type
Aggregated Node
Node Source
Curated node match
Last updated 2026-03-26
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ask pi about TullochCalifornia Independent System Operator (CISO)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Political Subdivision
Sector
IPP Non-CHP