Photo: Flickr, CC
"Leave a 100 Watt light bulb on for a year, pay $100."
Eric Drexler (sometimes called the father of nanotechnology, or more precisely, of molecular manufacturing) has been blogging for a little while and he recently had a short post with a useful rule of thumb to estimate electricity costs ins the US, and thus encourage conservation.
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:
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.
Of course a 100-watt bulb usually isn't on all the time for a year, but if it's on approximately 1/3 of the time, it'll take 3 years... The point is more to make energy use seem more real by using a real world usage. Unfortunately, most people still have no idea what their lights, appliances, electronics gadgets, etc, cost them and the planet.
Via Eric Drexler
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