Computers and particularly laser printers can really run up your power bills. Keep your printer turned off using the switch on the printer, when not in use. Some printers take as much power as 660 watts, the same as keeping a small microwave oven cooking continuously! We all have a tendancy to keep the computer on if we are not using it because we don't want to wait a couple of minutes to boot up again, but if you are going to be away from the computer for a hour turn it off as you will save more power in that hour than that used to power one 14 watt compact fluorescent lamp for 24 hours.