does the cost depends on where it is used?
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Here are some sites which should help in your research and yes costs would vary due to the costs of where the infrastructure was built and how easy it is to get to, to maintain the facilities.
http://www.geocollaborative.org/publications/Common_Questions_About_Geothermal_Energy.pdf
http://tonto.eia.doe.gov/energyexplained/index.cfm?page=electricity_factors_affecting_prices
http://www.alternative-energy-news.info/mariah-power-low-cost-wind-energy/