Many video-game consoles don’t have a “save” feature, so your children (and maybe you?) often leave them running all day and all night, allowing them to consume energy at full throttle the entire time. They won’t shut down automatically like your computer. A new study shows that the United States would have an electricity savings of $1 billion dollars a year if we turned off our game-playing machines when not in use. How much of that $1 billion are you paying?