According to the Energy Department, the average U.S. household spends about $1,900 a year on energy costs. Up to 10 percent of those energy costs are wasted on plugged-in appliances and electronics that are not in use. Even when turned off, items that are plugged in still use a small amount of energy. While many of us know to unplug cellphone chargers and televisions when not in use, there are other energy hogs that should also be unplugged: lamps, toaster ovens, coffee makers, cordless phones, stereos, radios, DVD players and modems. Unplugging helps you reduce energy costs and saves you money.