If you still have incandescent lightbulbs in your house, here is the tool for you. A calculator that can show you the huge savings of switching to CFL lighting.
Just put in the number of bulbs, and their nightly run time, and it will tell you how much could save. It tried some numbers of a typical house, and found a fairly substantial saving of $213.
It's much more user-friendly than my old method.
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