ABSTRACT
The global distribution of the most productive geothermal sources is largely dictated by geography, since this energy source is most abundant and accessible at places on Earth near tectonic plate boundaries, or in major volcanic regions. In most other places, geothermal has not yet proven economically competitive to exploit-at least for electricity generation. Given that many of the best sites for geothermal electricity generation have already been exploited, its future rapid growth is contingent on making technological advances that will allow lower grade resources to be exploited at costs competitive with other sources.
