Geothermal Resources

Geothermal Energy Pie Chart

Geothermal energy comes from heat stored in rocks and fluid in the Earth’s crust. Geothermal fluids may be steam or hot water. With more than 650 active, high-temperature (fluids over 212 degrees F) wells that tap into geothermal fields, California is the largest generator of electricity from geothermal energy in the United States. In 2017, the state received 5.7 percent of its electrical energy from geothermal resources.

The Division of Oil, Gas, and Geothermal Resources (DOGGR) regulates production and injection wells used for the discovery and extraction of geothermal resources on state and private land. By overseeing the drilling, operation, maintenance, and permanent closure of these wells, DOGGR supports development of this clean, renewable energy resource while protecting life, property, and underground and surface water. 


DOGGR is revising statewide geothermal regulations. Earlier in 2018, the public had the opportunity to comment on the geothermal Drilling Rig Discussion Draft. The DOGGR geothermal staff and Department of Conservation legal and regulatory staff have reviewed and assessed the public feedback and are developing documentation for a formal regulations draft. 

Current Geothermal Statutes and Regulations

Additional Information

Frequently Asked Questions (FAQs) and Facts

GIS Mapping

Geothermal Data

Geothermal Technical Reports

For Operators

Requirements, Records, and Related Information