“A CLEAN ENERGY FUTURE FOR THE UNITED STATES: THE CASE OF GEOTHERMAL POWER”. Testimony by the President of Iceland Olafur Ragnar Grimsson at a Senate Hearing Committee on Energy and Natural Resources”. US Senate. 26 Sept. 2007 – The holistic approach does not stop there; in Iceland, tourism is linked to the geothermal production plants, with balneology, health centres, cultural and educational centres, and cosmetic products based the geothermal chemicals, and so on. There is no limit to the spin-offs.