Geothermal heat pump impact (IMAGE) DOE/Oak Ridge National Laboratory Caption ORNL 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 Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.