Geothermal Resource Assessments

Results of the DOE Phase 1 geothermal play fairway probability analysis for the State of Hawaii

A geothermal resource assessment is a survey of geothermal energy available for use at a particular area. As the Hawaiian islands are a part of a chain of volcanoes that extends 3,800 miles, all of the major Hawaiian islands hold geothermal energy.

From 1978 through the 1980s, the Hawaii Geothermal Resources Assessment Program identified potential geothermal resource areas. In the first phase, the HGRA identified 20 Potential Geothermal Resource Areas (PGRA) through analyzing geological, geochemical and geophysical data. In the second phase, the program confirmed the PGRAs’ geothermal potential through conducting field studies through various geothermal exploration techniques. The program performed a preliminary field analysis for the 15 PGRAs that were determined to have enough resource potential to study.

Currently, HGGRC is conducting another statewide geothermal assessment for the Hawaii Play Fairway Project.


Geothermal Resource Assessments — State of Hawaii

Geothermal Resource Assessments — Hawaii Island (Big Island)

Geothermal Resource Assessments — Hawaii Geothermal Project (Puna, Big Island)

Geothermal Resource Assessments — Oahu Island


Geothermal Resource Subzone Designations — State of Hawaii

Geothermal Resource Subzone Designations — Hawaii Island (Big Island)


Proposals for Technical Advisory Services Relating to Geothermal Services, April 1991


Historical Map —  Hawaii Island (Big Island) — Geothermal resource subzones on the island of Hawaii


Historical Maps — Puna — Hawaii Island (Big Island)


Historical Maps — Kilauea Middle East Rift (KMER) — Hawaii Island (Big Island)


Historical Map — Kilauea Lower East Rift (KMER) — Hawaii Island (Big Island)


Historical Maps — Kamaili and Kapoho — Geothermal Resource Subzones — Hawaii Island (Big Island)