Photo: Volcano eruption, lava flow
Geothermal energy (heat from the earth) taps the volcanically-heated water and steam that occurs naturally in certain areas in Hawaii, particularly the younger islands of Maui and Hawaii where volcanic activity has been most recent.

Geothermal Resources
Three things are needed to produce geothermal energy: heat; a working fluid such as water or steam; and permeable rocks which allow the working fluid to move within the geothermal reservoir, picking up heat which can be brought to the surface through a geothermal well. The Kilauea East Rift Zone, thus far the only region developed for geothermal energy in Hawaii, has all three of these attributes.

Hawaii’s geothermal resource is “hydrothermal,” or water dominated, due to ample seawater and rainwater permeating the island’s lava foundation. In some parts of the world, such as The Geysers in California, geothermal reservoirs produce dry steam. In other places, such as the desert western United States, techniques for extracting the heat using “enhanced geothermal systems” (EGS) are being tested.

Current geothermal production capacity in Hawaii 38 MW Contracted price for first 25 MW of electricity from PGV 18.8¢ on peak, 15.9¢ off peak per kilowatt-hour (kWh)
Estimated probable reserves, Maui and Hawaii 1,000 MW Contracted price for next 5 MW 11.8¢/kWh
Median levelized cost of geothermal energy, U.S. 6¢ per kWh Contracted price for next 8 MW 9¢/kWh

For additional information:

For information and data on renewable energy and energy efficiency in Hawaii, download the Hawaii Energy Facts & Figures, May 2017 Edition.

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