Even when they’re off, energy vampires like computers, DVRs, cable boxes, chargers and even coffee makers slowly drain electricity. Vampire loads use about 5% of the energy consumed in the US, costing electric customers more than $3 billion each year. Tonight turn off your lights and look for standby lights. They’re a sign that something is draining power, even though it isn’t being used. Unplug them when they’re not in use, or use power strip to make powering on and off easier.