Computer science professor Christa Lopes holds an appliance communication module attached to the refrigerator in her home in Irvine, California January 26, 2015. Lopes said the Irvine Smart Grid Demonstration, a $79 million project funded half by federal stimulus money and half by Edison and partners like UC Irvine, cut her electric bill to zero in the summer. (Photo by Lucy Nicholson/Reuters)
