How much energy is wasted by leaving my computer on overnight, (Given average wattage of a machine in sleep mode, you could answer this one.) David Whitehouse at Peterborough (Ontario, Canada) Utilities Services just gave me the answer to this one for a column I'm working on. Here are two pages from a powerpoint presentation (Canadian dollars; current Peterborough electricity rates): This Computer was shut down every night at 4:30 and all Weekend over the last week. It used 4.48 kWh in one week and would use 215 kWh in a Year. That equates to $23.65 in a Year This Computer has been running all day, every night and all Weekend for the Last week! It used 20.68 kWh in one week and would use 993 kWh in a Year. That equates to $109.19 in a Year. The difference, I am noting in my column, is $85.54 for the year, or $427.70 over five years, just about enough to pay for a new CPU, which you are going to need after five years anyway.
Cheers,
John
John Bird,
Communications Coordinator Peterborough Green-Up
360 George St. N (Peterborough Square, lower level)
705-745-3238 [email protected]
Re: Computer Electricity Usage
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You forgot one piece. If that computer is in air conditioned space, multiply the electric loads by a factor (around here we use 1.3) which accounts for the portion of that energy that turns into heat and has to be electrically cooled. That will make the savings even better.
Thanks & Adios,
CJD --
Carol J. Dollard, P.E.,
LEED AP Utility Engineer
[email protected]
(970) 491-0151
(970) 491-6116 FAX
Mailing Address: Facilities Management Colorado State University
6030 Campus Delivery Fort Collins, CO 80523-6030