Between 5% and 20% of your home electric bill comes from vampire electric use--the energy used by appliances when turned off. Unplug small appliances and chargers when not in use.
Check out the Kill-a-Watt meter from the Multimedia Department to see which of your appliances are using the most energy.
Switch to compact fluorescent light bulbs (usually spiral-shaped). CFLs typically last 6,000 to 15,000 hours, whereas standard bulbs last 750 or 1,000 hours. They are also more efficient, using between one-seventh to one-third the energy of ordinary bulbs.
Languishing light bulbs waste energy, create heat, and run up utility bills. Turn the lights off when you leave a room, or better yet buy motion detecting light sensors to attach to your lamps. These detectors cost about $20 but, according to the US Department of Energy, will reduce overall energy consumption by 35-45%.