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IT Energy Facts

Power saving equipment

  • Typical electrical load of a desktop computer (monitor and system unit) while operating = 120W – 130W. 
  • Electrical load after power-saving equipment is activated = 20W – 30W. 

Therefore, power saving equipment operates with 20% less energy than a typical desktop setup.*

Computer monitors

  • Switch off screen rather than leaving in ‘sleep mode’
  • If you choose a flat screen instead of an ordinary PC monitor, 88kWh is saved yearly.

This corresponds to an annual saving of about €13 on the annual electricity bill. 

  • Computer monitors use 60% of the total power of the computer.
  • Only 10% of people turn off their monitor when they leave their desk for 30 mins.
    Leaving a PC monitor on all night wastes enough energy to microwave 6 dinners
  • In an office with 10 PC monitors left on overnight, enough energy is wasted to run 8 dishwasher loads/13 washing machine loads.


  • The average computer sucks down 35.5 watts when on standby.
    Ave. ‘On’ mode = 82.2watts, Ave. ‘Passive standby’ = 35.5 watts

Therefore, the average computer uses 43% of its total energy on standby*

  • The average laptop uses 16.5 watts when on standby
    Ave. ‘On mode’ = 34.1 watts, Ave. ‘Passive standby’= 16.5 watts

Therefore uses 48.4% of its total energy on standby*

  • Configure your computer to ‘energy saving mode’ or turn off…

Turn off

  • Turning off your computer at night instead of leaving it on will save on average 25% of its annual energy bill. 
  • Turn off when you’re not using for more than an hour.


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