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Big news, North Carolina: We just turned on the juice with Duke Energy. More than 1.5 million customers can now link their utility account to the JouleBug iPhone app to track how smart energy use is saving them money.*

This means we’re now covering more than 10 million residences. In the words of our founder: “Woohoooo!”

Duke Energy customers, download the JouleBug app (it’s free and quick) and earn the Bill Collector badge. Players save an average of $200 a year (as long as you don’t cheat).