According to the Union of Concerned Scientists, energy vampires (such as plugged-in and turned-on powerstrips, cable boxes, digital clocks, and so on) take up about 5% of the average home’s energy use. This adds up to “65 billion kilowatt-hours of electricity each year (…) $5.8 billion annually and sends more than 87 billion pounds of heat-trapping carbon dioxide into the atmosphere each year.” Of course, this data is from 2006. More current estimates say that energy vampires can take up to 10% of a household’s energy use. Since the average US household uses 920 kilowatt-hours per year, this amounts to 92 kilowatt-hours per household, per year.
I apologize, forgot to add a link to where I found the average US household energy use: http://www.eia.doe.gov/ask/electricity_faqs.asp
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