Geothermal energy is also a very cheap and clean source of energy, but in its current form, it has limitations. There are limited geothermal resources, and the supply may not have the potential to be increased substantially without further technological breakthroughs. Currently, the chief geothermal energy supplies are in the United States, Iceland and the Philippines. These supplies are very small and, apart from the geothermal facilities in Iceland, contribute only a relatively small fraction of the total energy supplies. This could change if deep hot rocks are utilized to capture energy. At present the deep hot rock technologies are not economic. But they represent a very large energy source if technological ...
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