190 MW Hydro operating in Madera, CA — California Independent System Operator
190 MW
Nameplate Capacity
2
Generators
units
Conventional Hydroelectric
Technology
1960
Operating Since
Coordinates
37.2203, -119.3380
County
Madera, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Southern California Edison Co | Southern California Edison | — |
| Owner(s) | Southern California Edison Co | Edison International | — |
| Status | Operating | operating | — |
Mammoth Pool Dam is a hydroelectric dam located on the San Joaquin River in the southern Sierra Nevada mountain range of California, about 45 miles (72 km) northeast of Fresno. It forms Mammoth Pool Reservoir and lies within the Sierra National Forest. The dam and reservoir were named after a large natural pool in the river that was once located above the present dam site.
Read more on WikipediaMammoth Pool is a 190 MW conventional hydroelectric power plant located in Madera County, California. The plant began operating in 1960 and has two generators. It is owned by Edison International and operated by Southern California Edison Co. The primary fuel source is water (WAT). The plant operates within the California Independent System Operator (CAISO) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
In the latest year of reported generation, Mammoth Pool produced 465,889 MWh of electricity, resulting in a capacity factor of 27.9%. According to available data, the installed cost of the plant was $383.51 per kW. Mammoth Pool is ranked as the 15th largest hydroelectric plant out of 42 in California, and 99th out of 194 nationally. News reports indicate that the plant has been mentioned in the news 10 times, with 8 articles related to hazards.
Generated from EIA, GEM, and public data sources
NERC Region
WECC
Balancing Authority
California Independent System Operator
Grid Voltage
220 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
35.8K MWh
Latest Month
465.9K MWh
Annual Generation
27.9%
Capacity Factor
$411/kW
Installed Cost
$12.9/MWh
Operating Cost
Southern California Edison Company
Reporting Utility
Cumulative Installed Cost
Per-Unit Cost Trends
Market Position
ISO/RTO Market
CAISO
LMP Node
MAMOTH2G_7_B1
Pricing Hub
TH_ZP26_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
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Last updated 2026-03-26
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