Good news: The iPhone 5 doesn’t just feel light in your hand, it will also feel light in your electric bill. The energy-consumption researchers at Opower on Thursday released a study showing that Apple’s newest smartphone costs just $0.41 per year to charge, or $0.12 less than the Samsung Galaxy S III. In fact, Opower says that the only big-name consumer device to suck up less power than the iPhone 5 was the iPhone 4, which cost just $0.38 to charge per year. By comparison, Opower says that an Xbox 360 costs an average of $40.24 to power per year while a laptop PC costs around $8.31. Read the full story at Boy Genius Report.