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29.9 MW Hydro operating in Tuolumne, CA
29.9 MW
Nameplate Capacity
3
Generators
units
Conventional Hydroelectric
Technology
1958
Operating Since
Coordinates
37.8763, -120.6052
County
Tuolumne, CA
Nearby Plants
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| 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
California Independent System Operator (CISO)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Political Subdivision
Sector
IPP Non-CHP
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
1.1K MWh
Latest Month
103.6K MWh
Annual Generation
39.4%
Capacity Factor
Forward-looking generation outlook with probabilistic ranges across weather, demand, and policy scenarios. Powered by InfraSure's generation modeling stack.
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $68.6M
Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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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
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
View all articlesForward forecasts, scenario decomposition, and risk-decision tooling for this asset.