The National Resources Defense Council has released a study that analyzes the energy efficiency of gaming consoles, with the results leaning in favor of Nintendo Wii. The Wii uses up only 16 watts of power, as opposed to the Sony PlayStation 3 which eats up 150 watts and the Xbox 360 which uses up 116 watts.
Does that mean you have to let go of your current console and make the switch to a Wii? Not necessarily. You can just turn off your consoles after using them instead. That simple act can already save a lot of power!