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| Geothermal areas of the United States | |
|---|---|
| Name | Geothermal areas of the United States |
| Caption | Old Faithful Geyser, Yellowstone National Park |
| Location | United States |
| Type | Geothermal areas |
| Notable sites | Yellowstone National Park, Geysers (geothermal field), Coso Volcanic Field, Lassen Volcanic National Park, Beowawe Nevada, Salton Sea Geothermal Field |
Geothermal areas of the United States comprise hot springs, geysers, fumaroles, hydrothermal convection systems, volcanic centers, and engineered reservoirs distributed across the United States. These zones host natural features such as Old Faithful, commercial facilities like The Geysers (geothermal field), and research installations near United States Geological Survey observatories and U.S. Department of Energy programs. Geothermal sites are significant for National Park Service tourism, Bureau of Land Management leasing, and energy development involving entities such as Calpine Corporation and Ormat Technologies.
Geothermal resources in the United States arise where heat from the Mantle and shallow magmatic bodies intersects permeable crustal rocks, producing manifestations at places like Yellowstone Caldera, Long Valley Caldera, Cascades Volcanoes, and the Rio Grande Rift. The resource base spans hydrothermal systems exploited at The Geysers (geothermal field), enhanced geothermal systems trialed by Sandia National Laboratories and Lawrence Berkeley National Laboratory, and low-temperature resources used in Iowa State University research and municipal projects in Portland, Oregon. Federal mapping efforts by the United States Geological Survey and scenario analyses from the U.S. Department of Energy estimate accessible thermal energy in regions such as the Great Basin, Snake River Plain, and Salton Trough. Agencies including the Bureau of Reclamation and the National Renewable Energy Laboratory coordinate assessments alongside universities like Stanford University and University of California, Berkeley.
Major geothermal provinces include the Cascade Range, the Basin and Range Province, the Columbia Plateau, the Salton Trough, the Aleutian Arc, the Hawaiian hot spot, and the Alaska Range. Important fields and sites are The Geysers (geothermal field) in California, Coso Volcanic Field near China Lake Naval Air Weapons Station, Salton Sea Geothermal Field adjacent to Imperial County, Beowawe, Nevada in Eureka County, Steamboat Springs, Nevada, and Lassen Volcanic National Park. Other notable locales include Hot Springs National Park in Arkansas, Chena Hot Springs in Alaska, Dixie Valley, Nevada, and the Valles Caldera adjacent to New Mexico. Infrastructure intersects lands administered by Bureau of Land Management, National Park Service, United States Forest Service, and tribal lands such as those of the Pascua Yaqui Tribe and Shoshone-Bannock Tribes.
Electricity generation is concentrated in plants using flash, binary, and dry steam technologies at facilities owned by Calpine Corporation, Ormat Technologies, Enel North America, and independent producers in California, Nevada, Utah, Oregon, and Hawaii. The largest complex, The Geysers (geothermal field), feeds a regional grid connected to California Independent System Operator operations, while Salton Sea Geothermal Field projects link to Imperial Irrigation District systems and proposals involving Chevron Corporation. Federal incentives from the Investment Tax Credit era and state policies in California Energy Commission and Nevada Public Utilities Commission jurisdictions drove early growth; current research with National Renewable Energy Laboratory explores supercritical systems near the Ring of Fire and Cascadia subduction zone settings. Transmission planning engages Western Electricity Coordinating Council and regional utilities confronting siting on Bureau of Land Management parcels and California Environmental Quality Act review.
Direct-use applications appear in municipal heating, greenhouse agriculture, aquaculture, and balneological facilities in places such as Boise, Idaho, Klamath Falls, Oregon, Reykjavik (Iceland)—as an international comparison—and domestic examples like Pagosa Springs, Colorado. District heating pilots in Boise coordinate with the Idaho National Laboratory and local utilities; greenhouse projects in Imperial County leverage heat from the Salton Sea Geothermal Field alongside research by University of California, Riverside. Spa and resort operations occur at Hot Springs National Park, Glenwood Springs, Colorado, and Warm Springs, Oregon. Universities including Montana State University and Oregon State University operate campus systems and research demonstrating cascade use for heat pumps and building integration in collaboration with the U.S. Department of Energy.
Environmental concerns over geothermal development involve induced seismicity observed near Geysers (geothermal field), subsidence events documented at Salton Sea, fluid disposal issues addressed by the Environmental Protection Agency, and surface impacts within protected areas like Yellowstone National Park and Hot Springs National Park. Regulatory frameworks include leasing procedures by the Bureau of Land Management, permitting through state commissions such as the California Energy Commission and the Nevada Division of Minerals, and tribal consultation requirements under statutes interpreted by the United States Department of the Interior. Litigation and policy debates have implicated entities like Sierra Club, Defenders of Wildlife, and local governments in Imperial County over protected species, cultural resources, and water rights adjudicated in forums like United States District Court for the District of Nevada.
Research centers and initiatives include the U.S. Department of Energy Geothermal Technologies Office, the National Renewable Energy Laboratory, Lawrence Berkeley National Laboratory, Sandia National Laboratories, and university consortia at Stanford University, University of Utah, and University of California, Davis. Exploration uses techniques honed in collaborations with Schlumberger, Halliburton, and academic partners: magnetotellurics at Coso Volcanic Field, 3D seismic at Salton Sea, and enhanced geothermal systems experiments at Newberry Volcano and Raft River Geothermal Area. Advances in drilling from suppliers such as Baker Hughes and reservoir stimulation informed by USGS datasets aim to access supercritical fluids beneath calderas like Long Valley Caldera and Valles Caldera. International partnerships involve Iceland Renewable Energy research exchanges and technology transfers with Japan and New Zealand.
Indigenous peoples including the Shoshone, Paiute, Hopi, and Nez Perce have long-standing cultural connections to hot springs and thermal landscapes at sites later visited by explorers such as John C. Fremont and documented by naturalists like John Muir. The establishment of Yellowstone National Park in 1872 formalized protection of geyser basins while early commercial development at Hot Springs National Park and 20th-century projects in California and Nevada drove industrial uses. Historic figures and institutions—Wallace Pratt, Geysers Electric Company, U.S. Geological Survey, and state geological surveys—shaped mapping and exploitation. Cultural tourism, art, and literature referencing thermal features appear in works by Mark Twain and photographs by Ansel Adams, reflecting ongoing intersections between science, heritage, and resource development.
Category:Geothermal energy in the United States