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"Geothermal energy is a type of renewable energy that encourages conservation of natural resources. According to the U.S. Environmental Protection Agency, geo-exchange systems save homeowners 30-70 percent in heating costs, and 20-50 percent in cooling costs, compared to conventional systems.[19] Geo-exchange systems also save money because they require much less maintenance. In addition to being highly reliable they are built to last for decades. Some utilities, such as Kansas City Power and Light, offer special, lower winter rates for geothermal customers, offering even more savings"