Welcome to Geothermal Resources
The Geothermal Section oversees the drilling, operation, maintenance, plugging, and abandonment of geothermal wells on state and private lands to ensure public safety and protect underground and surface waters.
Scanned Geothermal Well Records
The Division of Oil, Gas, & Geothermal Resources has well records for most of the geothermal wells drilled in California. All of these well records have been scanned. Scanned well records for wells that are not confidential can be found here. These records are complete through 2014. For records from 2015 to present, please use GeoSteam.
Operator Submittal of Well Records
Geothermal well records must include complete and accurate information concerning the well location and the cementing details. For more information please see the Notice to Operators (click here to view), issued May 6, 2011.
SB 571 Signed by Governor
Senate Bill 571, introduced by Senator Maldonado, was approved by Governor Schwarzenegger on October 11, 2009. The bill adds Section 3724.32 to the Public Resources Code and reads as follows:
3724.32 When an operator fails to pay a civil penalty imposed pursuant to Section 3754.5, comply with an order of the supervisor issued pursuant to this chapter, or pay a charge assessed under Section 3724.5, the supervisor may deny approval of the operator's proposed well operations until the operator pays the civil penalty, complies with the order of the supervisor, or pays the charge assessed under Section 3724.5.
Coproduction of Geothermal Power from Oil and Gas Fields in California: Hot water produced from oil and gas wells can be used to generate geothermal power under certain temperature and flow conditions. This report provides links to technical reports about produced water and reservoir temperatures from oil and gas fields in California. Links to electric logs and to information on temperature gradients in sedimentary basins within the State are also provided.
The Geothermal Hot Line
Published by the Division of Oil, Gas, & Geothermal Resources from 1971 through 1996, the Geothermal Hot Line has been scanned and is available online. To access the issues of Geothermal Hot Line, click here.
The Division of Oil, Gas, and Geothermal Resources oversees the drilling, operation, maintenance, plugging, and abandonment of geothermal wells on state and private lands to ensure public safety and protect underground and surface waters.
California is the United States' largest generator of electricity from geothermal energy. In 2014, California received nearly 4.4 percent of its electrical energy from geothermal resources (about 13,000 Gigawatt-hours). The state has over 650 active, high-temperature geothermal wells (with fluids over 212° F) and 230 injection wells.
Kids' and Educators' Pages
Games, puzzles, and information about geothermal resources in California. Meet Steamer, the engineering dog, and Electra, the electricity cat.
Division staff in Sacramento, El Centro, and Santa Rosa answer questions about geothermal resources. Staff members permit wells, and make field inspections.
Geothermal Field Maps
View and download the large-scale map of California’s geothermal fields and digitized field maps.