computer costs

Did You Know
A computer that is on constantly uses approximately $165 worth of electricity per year. However, if it is on continuously, but goes into 'sleep mode' , it will cost $84 per year to operate. If you shut it off at night, it will cost only $28 per year.

From the Canada School of Public Service's Green Procurement course (C215).

Too bad they don't state the electricity rates or actual power consumption so we can calculate difference at today's rates wherever we happen to be. Still, should be enough to convince people to power their PCs down when not in use for a large chunk of the day.