Americans use nearly a million dollars worth of energy every minute — night and day — every day of the year. The largest portion of your energy bill goes toward keeping your home a comfortable temperature. Heating accounts for 66 percent of your annual energy bill, followed by 22 percent for cooling. Other big energy users in the home are appliances and the hot water heater. Every kilowatt you conserve and every battery you save can significantly trim your monthly energy bill while helping you protect the planet.