One Watt, One Year: One dollar


For residential customers in the U.S., the average price of electricity has recently* been at $0.115 per kilowatt-hour. This works out to almost exactly $1.00 per Watt-year:

$150 per year - 0.8 Tons of CO2

Leave a 100 Watt light bulb on for a year, pay $100.

I found this surprising when I calculated it. The number is simple, memorable, and encourages conservation. Pass it on.

*Last November (source: U.S. Energy Information Administration)

Another number: 100 Watts, one year, over 1/2 ton of CO2 emissions.
(based on data from the U.S. Energy Information Administration)

Eric Drexler

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