On Mon, 17 May 2010 21:30:35 -0600, WW wrote:

if the utility KW cost $.10 you can figure out the rest.

Our utility prices are 11 cents (¢) per kilowatt (KW) for the first KW of
the month but 48¢ for the last two or three weeks' worth of kilowatts. I
would guess the average KW out here to then be about 35¢.

So, if I add a dozen of these lighted switches, and they're on most of the
day, say, 20 hours per day for 30 days in a month, at .096 watts per hour,
that comes to about a penny per day, I think.

12switches x 20hours/day x 30days/month x 0.1watts x 35¢/KW x 1KW/1000W =
25¢/month