When Teresa Harshbarger and her family built their home outside of New Concord several years ago, they bought their water heater from Guernsey-Muskingum Electric Cooperative (GMEC). It came equipped with a radio-controlled switch that allows the cooperative to remotely turn off the heater to curtail electricity use during times of heavy demand. Though she says she’s sure the switch has been activated from time to time, she has never noticed when it happens.