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An Oak Ridge National Laboratory study projects how geothermal heat pumps that derive heating and cooling from the ground would improve grid reliability and reduce costs and carbon emissions when widely deployed. Credit: Chad Malone, ORNL, U.S. Dept. of Energy

A modeling analysis led by ORNL gives the first detailed look at how geothermal energy can relieve the electric power system and reduce carbon emissions if widely implemented across the United States within the next few decades. 

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With water heating consuming about 17 percent of the energy for a typical household, it's a good place to start when cutting costs. ORNL's Building Technology Center is assisting in developing a heat pump water heater as a "drop-in" replacement for a conventional 50- or 80-gallon water heater. It fe...