Mammoth Pool
Sierra National Forest, North Fork, CA 93643Plant Summary Information
Mammoth Pool is ranked #15 out of 209 hydroelectric power plants in California in terms of total annual net electricity generation.
Mammoth Pool is comprised of 2 generators and generated 73.4 GWh during the 3-month period between August 2025 to November 2025.
| Plant Name | Mammoth Pool |
|---|---|
| Utility Name | Southern California Edison Co |
| Location | Madera County, CA |
| Initial Operation Date | March 1960 |
| Last Update | Nov 2025 |
| Annual Generation | 439.2 GWh |
| Annual Consumption | 1.5 M MMBtu |
| Ranked #1,484 out of 12,574 Power Plants Nationwide | |
| Ranked #94 out of 1,331 Water Power Plants Nationwide | |
| Ranked #98 out of 1,603 California Power Plants | |
| Ranked #15 out of 209 California Water Power Plants | |
| Fuel Types | Water |
Map of Mammoth Pool
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Monthly Net Generation for Mammoth Pool
Mammoth Pool Details
| Summary Information | |
|---|---|
| Plant Name | Mammoth Pool (344) |
| Plant Address | Sierra National Forest, North Fork, CA 93643 |
| Utility | Southern California Edison Co (17609) |
| Latitude, Longitude | 37.2203, -119.33798 |
| Generation Dates on File | Jan 2001 to Nov 2025 |
| Initial Operation Date | March 1960 |
| Annual Generation | 439.2 GWh |
| Fuel Types | Water |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | No |
| FERC Exempt Wholesale Generator Status | No |
| Regulatory Information | |
|---|---|
| Regulatory Status | Regulated |
| NERC Region | WECC |
| Balancing Authority | California Independent System Operator (CISO) |
| NAICS Code | Utilities (22) |
| Sector | Electric Utility (1) |
| Water Source | San Joaquin River |
| Ash Impoundment | |
| Transmission / Distribution Owner | Southern California Edison Co (17609) CA |
| Grid Voltage | 220.00 kV |
| Energy Storage | No |
Generator 1 Details Operating March 1960
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| Nameplate Capacity | 95 MW |
| Nameplate Power Factor | 1 |
| Summer Capacity | 95 MW |
| Winter Capacity | 95 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
|---|---|
| First Operation Date | March 1960 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Time From Cold Shutdown To Full Load | 10M |
Generator 2 Details Operating March 1960
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| Nameplate Capacity | 95 MW |
| Nameplate Power Factor | 1 |
| Summer Capacity | 95 MW |
| Winter Capacity | 95 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | March 1960 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Time From Cold Shutdown To Full Load | 10M |
Mammoth Pool Plant Owners
| Owner Name | Address | Generator | Ownership | We couldn't locate any owners for this plant |
|---|
Power Plants with Similar Net Generation
Power plants with a similar annual net generation from Water.
| Rank | Plant Name | Plant Location | Annual Generation |
|---|---|---|---|
| #84 | John H Kerr | Boydton, VA | 462.9 GWh |
| #85 | Long Lake | Ford, WA | 456.2 GWh |
| #86 | Guntersville | Guntersville, AL | 454.8 GWh |
| #87 | Lay Dam | Clanton, AL | 454.4 GWh |
| #88 | Walter Bouldin Dam | Wetumpka, AL | 450.3 GWh |
| #89 | Douglas Dam | Dandridge, TN | 446.4 GWh |
| #90 | Meldahl Hydroelectric Project | Foster, KY | 445.6 GWh |
| #91 | Balch 2 | Balch Camp, CA | 443.4 GWh |
| #92 | Pit 7 | Montgomery Creek, CA | 442.2 GWh |
| #93 | Jaybird | Camino, CA | 440.6 GWh |
| #95 | Old Hickory | Hendersonville, TN | 436.6 GWh |
| #96 | Thompson Falls | Thompson Falls, MT | 436.4 GWh |
| #97 | Ryan | Great Falls, MT | 434.6 GWh |
| #98 | Hawks Nest Hydro | Gauley Bridge, WV | 433.8 GWh |
| #99 | Caribou 2 | Belden, CA | 429.1 GWh |
| #100 | Hartwell Lake | Hartwell, GA | 422.6 GWh |
| #101 | C J Strike | Bruneau, ID | 422.3 GWh |
| #102 | Walter F George | Ft. Gaines, GA | 421.7 GWh |
| #103 | Cannelton Hydroelectric Plant | Hawesville, KY | 415.9 GWh |
| #104 | Flaming Gorge | Dutch John, UT | 407.9 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Mammoth Pool.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| A G Wishon | North Fork, CA | 21.6 GWh | 10.4 mi |
| Balch 1 | Balch Camp, CA | 138.8 GWh | 25.5 mi |
| Balch 2 | Balch Camp, CA | 443.4 GWh | 25.6 mi |
| Big Creek 1 | Big Creek, CA | 405.3 GWh | 5.5 mi |
| Big Creek 2 | Auberry, CA | 355.2 GWh | 2.2 mi |
| Big Creek 2A | Auberry, CA | 231.9 GWh | 2.2 mi |
| Big Creek 3 | Auberry, CA | 637.1 GWh | 5.6 mi |
| Big Creek 4 | North Fork, CA | 347.6 GWh | 10.1 mi |
| Big Creek 8 | Auberry, CA | 173.8 GWh | 0.9 mi |
| Clovis North High School | Fresno, CA | 1.5 GWh | 31.7 mi |
| Friant Hydro Facility | Friant, CA | 59.8 GWh | 25.3 mi |
| Haas | Balch Camp, CA | 208.3 GWh | 26.8 mi |
| J S Eastwood | Shaver Lake, CA | 82.3 GWh | 6.7 mi |
| Kerckhoff 2 | Auberry, CA | 396.4 GWh | 15.9 mi |
| Kings River PH | Balch Camp, CA | 106.9 GWh | 25 mi |
| Kings River Syphon | Sanger, CA | 325.0 MWh | 32 mi |
| Pine Flat | Piedra, CA | 331.2 GWh | 26.8 mi |
| Portal | Lakeshore, CA | 18.7 GWh | 10.2 mi |
| SCCCD - Clovis Community College | Fresno, CA | 2.0 GWh | 31.7 mi |
| Site 980 65 | Madera, CA | 4.9 GWh | 32.9 mi |