- A screen saver is not necessarily an energy saver.
The average desktop computer consumes between 60 to 250 watts a day. Compared with a machine left on all day, a computer that is in use four hours a day and turned off the rest of the time would save you about $70 a year, not to mention the enormous reduction on CO2 emissions.
So make it a habit to turn off your monitor when you leave your desk and shut down your computer when you're leaving for the day.