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Computers, printers, fax machines and copiers consume energy even while they are not in use. The following table provides a summary of typical electrical power requirements and annual energy use for common office equipment. The table compares the annual energy cost of equipment that is turned off at night and over the weekends and equipment that is left on round the clock. By multiplying these values by the number of devices in your office you can get an estimate of how much money is spent on electricity to power these devices, and how much more it costs to leave them on all the time.
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Equipment
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Typical Power Requirements (Watts)
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Annual Energy Cost – Off at Night
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Annual Energy Cost – On 24 Hours/Day
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Computer
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55
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$9
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$39
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Monitor (15")
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75
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$12
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$54
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Laser printer
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60
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$14
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$44
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Fax machine
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35
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$9
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$27
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Copier (small)
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115
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$30
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$83
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Copier (large)
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310
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$80
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$224
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Source: Office Equipment Energy Savings Calculator, LBL.
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