Mammoth Pool
Sierra National Forest, North Fork, CA 93643Plant Summary Information
Mammoth Pool is ranked #6 out of 207 hydroelectric power plants in California in terms of total annual net electricity generation.
Mammoth Pool is comprised of 2 generators and generated 221.5 GWh during the 3-month period between March 2026 to June 2026.
| Plant Name | Mammoth Pool |
|---|---|
| Utility Name | Southern California Edison Co |
| Location | Madera County, CA |
| Initial Operation Date | March 1960 |
| Last Update | Jun 2026 |
| Annual Generation | 571.5 GWh |
| Annual Consumption | 2.2 M MMBtu |
| Ranked #1,202 out of 13,094 Power Plants Nationwide | |
| Ranked #66 out of 1,309 Water Power Plants Nationwide | |
| Ranked #65 out of 1,607 California Power Plants | |
| Ranked #6 out of 207 California Water Power Plants | |
| Fuel Types | Water |
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Monthly Net Generation for Mammoth Pool
Monthly Plant Fuel Consumption 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 Jun 2026 |
| Initial Operation Date | March 1960 |
| Annual Generation | 571.5 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 |
|---|---|---|---|
| #56 | Big Bend Dam | Chamberlain, SD | 745.8 GWh |
| #57 | Gavins Point | Crofton, NE | 694.0 GWh |
| #58 | Chickamauga | Chattanooga, TN | 693.8 GWh |
| #59 | Palisades Dam | Palisades, ID | 657.3 GWh |
| #60 | Bull Shoals | Mountain Home, AR | 647.3 GWh |
| #61 | Fort Loudoun | Lenoir City, TN | 633.1 GWh |
| #62 | Hungry Horse | Columbia Falls, MT | 632.9 GWh |
| #63 | Barkley | Kuttawa, KY | 624.9 GWh |
| #64 | Mayfield | Silver Creek, WA | 602.5 GWh |
| #65 | Nickajack | New Hope, TN | 577.6 GWh |
| #67 | Calderwood | Tallassee, TN | 568.7 GWh |
| #68 | Yellowtail | Hardin, MT | 566.2 GWh |
| #69 | J Strom Thurmond | Clarks Hill, SC | 566.0 GWh |
| #70 | Dion R Holm | Groveland, CA | 550.4 GWh |
| #71 | Folsom | Folsom, CA | 535.7 GWh |
| #72 | Diablo | Rockport, WA | 518.2 GWh |
| #73 | Dardanelle | Dardanelle, AR | 517.3 GWh |
| #74 | James B Black | Big Bend, CA | 512.8 GWh |
| #75 | Guntersville | Guntersville, AL | 509.1 GWh |
| #76 | Swift 1 | Cougar, WA | 503.6 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 | 24.1 GWh | 10.4 mi |
| Balch 1 | Balch Camp, CA | 71.2 GWh | 25.5 mi |
| Balch 2 | Balch Camp, CA | 342.3 GWh | 25.6 mi |
| Big Creek 1 | Big Creek, CA | 409.1 GWh | 5.5 mi |
| Big Creek 2 | Auberry, CA | 376.6 GWh | 2.2 mi |
| Big Creek 2A | Auberry, CA | 302.6 GWh | 2.2 mi |
| Big Creek 3 | Auberry, CA | 747.9 GWh | 5.6 mi |
| Big Creek 4 | North Fork, CA | 397.6 GWh | 10.1 mi |
| Big Creek 8 | Auberry, CA | 151.8 GWh | 0.9 mi |
| Clovis East High School | Clovis, CA | 1.3 GWh | 33.5 mi |
| Clovis North High School | Fresno, CA | 1.5 GWh | 31.7 mi |
| Friant Hydro Facility | Friant, CA | 73.5 GWh | 25.3 mi |
| Haas | Balch Camp, CA | 153.3 GWh | 26.8 mi |
| J S Eastwood | Shaver Lake, CA | 108.6 GWh | 6.7 mi |
| Kerckhoff 2 | Auberry, CA | 443.6 GWh | 15.9 mi |
| Kings River PH | Balch Camp, CA | 80.8 GWh | 25 mi |
| Pine Flat | Piedra, CA | 348.4 GWh | 26.8 mi |
| Portal | Lakeshore, CA | 26.2 GWh | 10.2 mi |
| SCCCD - Clovis Community College | Fresno, CA | 2.0 GWh | 31.7 mi |
| Site 980 65 | Madera, CA | 1.8 GWh | 32.9 mi |