Mammoth G2
85 Casa Diablo, Mammoth Lakes, CA 93546Plant Summary Information
Mammoth G2 is ranked #39 out of 63 geothermal power plants nationwide in terms of total annual net electricity generation.
Mammoth G2 is comprised of 3 generators and generated 21.0 GWh during the 3-month period between September 2025 to December 2025.
| Plant Name | Mammoth G2 |
|---|---|
| Utility Name | Ormat Nevada Inc |
| Location | Mono County, CA |
| Initial Operation Date | December 1990 |
| Last Update | Dec 2025 |
| Annual Generation | 83.8 GWh |
| Annual Consumption | 312.8 k MMBtu |
| Ranked #3,699 out of 13,081 Power Plants Nationwide | |
| Ranked #39 out of 63 Geothermal Power Plants Nationwide | |
| Ranked #369 out of 1,606 California Power Plants | |
| Ranked #21 out of 30 California Geothermal Power Plants | |
| Fuel Types | Geothermal |
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Monthly Net Generation for Mammoth G2
Monthly Plant Fuel Consumption for Mammoth G2
Mammoth G2 Details
| Summary Information | |
|---|---|
| Plant Name | Mammoth G2 (10481) |
| Plant Address | 85 Casa Diablo, Mammoth Lakes, CA 93546 |
| Utility | Ormat Nevada Inc (34691) |
| Latitude, Longitude | 37.6464, -118.9092 |
| Generation Dates on File | Jan 2001 to Dec 2025 |
| Initial Operation Date | December 1990 |
| Annual Generation | 83.8 GWh |
| Fuel Types | Geothermal |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | Yes |
| FERC Small Power Producer Docket Number | 86-392-001 |
| FERC Exempt Wholesale Generator Status | No |
| Regulatory Information | |
|---|---|
| Regulatory Status | Non-Regulated |
| NERC Region | WECC |
| Balancing Authority | California Independent System Operator (CISO) |
| NAICS Code | Utilities (22) |
| Sector | IPP Non-CHP (2) |
| Water Source | Wells |
| Ash Impoundment | |
| Transmission / Distribution Owner | Southern California Edison Co (17609) CA |
| Grid Voltage | 33.00 kV |
| Energy Storage | No |
Generator 1 Details Operating December 1990
| Technology | Geothermal |
|---|---|
| Prime Mover | Turbines Used in a Binary Cycle |
| Ownership | Wholly Owned by Other Entity |
| Nameplate Capacity | 5 MW |
| Nameplate Power Factor | 0.8 |
| Summer Capacity | 3.3 MW |
| Winter Capacity | 5 MW |
| Minimum Load | 3.3 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
|---|---|
| First Operation Date | December 1990 |
| Combined Heat & Power | No |
| Sector Name | IPP Non-CHP (2) |
| Energy Source | Geothermal |
| Solid Fuel Gasification | No |
| Time From Cold Shutdown To Full Load | OVER |
| Multiple Fuels | No |
Generator 2 Details Operating December 1990
| Technology | Geothermal |
|---|---|
| Prime Mover | Turbines Used in a Binary Cycle |
| Ownership | Wholly Owned by Other Entity |
| Nameplate Capacity | 5 MW |
| Nameplate Power Factor | 0.8 |
| Summer Capacity | 3.3 MW |
| Winter Capacity | 5 MW |
| Minimum Load | 3.3 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
|---|---|
| First Operation Date | December 1990 |
| Combined Heat & Power | No |
| Sector Name | IPP Non-CHP (2) |
| Energy Source | Geothermal |
| Solid Fuel Gasification | No |
| Time From Cold Shutdown To Full Load | OVER |
| Multiple Fuels | No |
Generator 3 Details Operating December 1990
| Technology | Geothermal |
|---|---|
| Prime Mover | Turbines Used in a Binary Cycle |
| Ownership | Wholly Owned by Other Entity |
| Nameplate Capacity | 5 MW |
| Nameplate Power Factor | 0.8 |
| Summer Capacity | 3.3 MW |
| Winter Capacity | 5 MW |
| Minimum Load | 3.3 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
|---|---|
| First Operation Date | December 1990 |
| Combined Heat & Power | No |
| Sector Name | IPP Non-CHP (2) |
| Energy Source | Geothermal |
| Solid Fuel Gasification | No |
| Time From Cold Shutdown To Full Load | OVER |
| Multiple Fuels | No |
Mammoth G2 Plant Owners
| Owner Name | Address | Generator | Ownership |
|---|---|---|---|
| Mammoth Pacific LP | P.O.Box 15843211 Jermantown Road, Mammoth Lakes, CA 93546 | Generator 1 | 100.00% |
| Mammoth Pacific LP | P.O.Box 15843211 Jermantown Road, Mammoth Lakes, CA 93546 | Generator 2 | 100.00% |
| Mammoth Pacific LP | P.O.Box 15843211 Jermantown Road, Mammoth Lakes, CA 93546 | Generator 3 | 100.00% |
Power Plants with Similar Net Generation
Power plants with a similar annual net generation from Geothermal.
| Rank | Plant Name | Plant Location | Annual Generation |
|---|---|---|---|
| #29 | Beowawe | Beowawe, NV | 167.1 GWh |
| #30 | Neal Hot Springs Geothermal Project | Vale, OR | 152.3 GWh |
| #31 | Cove Fort | Cove Fort, UT | 142.1 GWh |
| #32 | Ormesa II | Holtville, CA | 131.7 GWh |
| #33 | Tuscarora Geothermal Power Plant | Tuscarora, NV | 119.8 GWh |
| #34 | Soda Lake 3 | Fallon, NV | 108.3 GWh |
| #35 | Don A Campbell 1 Geothermal | Gabbs, NV | 97.0 GWh |
| #36 | Richard Burdette Geothermal | Reno, NV | 88.8 GWh |
| #37 | Don A Campbell 2 Geothermal | Luning, NV | 88.6 GWh |
| #38 | Raft River Geothermal Power Plant | Malta, ID | 88.1 GWh |
| #40 | Brady | Fallon, NV | 83.3 GWh |
| #41 | Aidlin Geothermal Power Plant | Middletown, CA | 82.4 GWh |
| #42 | Desert Peak Power Plant | Fernley, NV | 78.2 GWh |
| #43 | Patua Acquisition Project, LLC | Hazen, NV | 103.3 GWh |
| #44 | Galena 3 Geothermal Power Plant | Reno, NV | 77.9 GWh |
| #45 | Salton Sea Power Gen Co - Unit 1 | Calipatria, CA | 77.1 GWh |
| #46 | San Emidio | Gerlach, NV | 76.4 GWh |
| #47 | Mammoth G3 | Mammoth Lakes, CA | 75.3 GWh |
| #48 | Salton Sea Power Gen Co - Unit 2 | Calipatria, CA | 74.8 GWh |
| #49 | Steamboat III | Reno, NV | 72.7 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Mammoth G2.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Big Creek 1 | Big Creek, CA | 409.1 GWh | 35.5 mi |
| Big Creek 2 | Auberry, CA | 376.6 GWh | 37.8 mi |
| Big Creek 2A | Auberry, CA | 273.7 GWh | 37.8 mi |
| Bishop Creek 2 | Bishop, CA | 13.2 GWh | 31.7 mi |
| Bishop Creek 3 | Bishop, CA | 23.9 GWh | 31.5 mi |
| Bishop Creek 4 | Bishop, CA | 35.8 GWh | 31.6 mi |
| Bishop Creek 5 | Bishop, CA | 10.7 GWh | 31.9 mi |
| Bishop Creek 6 | Bishop, CA | 8.9 GWh | 31.9 mi |
| CD4 | Mammoth Lakes, CA | 236.3 GWh | 0.4 mi |
| Control Gorge | Bishop, CA | 46.4 GWh | 24.1 mi |
| Lundy | Lee Vining, CA | 6.7 GWh | 30.9 mi |
| Mammoth G1 | Mammoth lakes, CA | 43.6 GWh | 0.3 mi |
| Mammoth G3 | Mammoth Lakes, CA | 75.3 GWh | 0.1 mi |
| Mammoth Pool | North Fork, CA | 568.6 GWh | 37.7 mi |
| Middle Gorge | Bishop, CA | 48.0 GWh | 20.9 mi |
| Pleasant Valley Hydro | Bishop, CA | 6.3 GWh | 26.5 mi |
| Poole | Lee Vining, CA | 22.3 GWh | 26.5 mi |
| Portal | Lakeshore, CA | 26.2 GWh | 30.2 mi |
| Rush Creek | June lake, CA | 30.0 GWh | 14.4 mi |
| Upper Gorge | Bishop, CA | 51.9 GWh | 18.8 mi |