The more technologically advanced a product is, the more power it consumes. That would be the case with the Nintendo Wii, XBox 360 and PS3. The Nintendo Wii uses about 1/10 the power of the XBox 360, and about 1/20 the power of the PS3.
Wii:
– In Standby Mode: 10w
– Idle @ Wii menu: 17w
– Running a Wii Game in 480i: 17w
Xbox 360:
– In Standby Mode: 2w
– Idle @ Dashboard: 140w
– Running a Game: 160w
– Playing a DVD: 110w
PLaystation 3:
– Running a Game: 380w
SOURCE: Kotaku