This report has been prepared by the Institute of Geological and Nuclear Sciences Limited (GNS Science) exclusively for and under contract to Ministry of Research Science and Technology. This desktop study provides an overview of the geothermal potential of selected Pacific islands and territories. It has been based on an initial literature review of 20 Pacific countries and then a subsequent more detailed review of five Pacific countries, Papua New Guinea, Vanuatu, Samoa, Tonga and the Northern Mariana Islands. The report provides information on the geology and known geothermal features in each of the selected nations or territory’s, combined with a summary of energy demand, and potential for geothermal development.