A young man name Conor Klein... Came up with this idea... Known as the Outlet Regulator... He explain the device as being a Leech... Once a leech is full of blood it simply fall off its host to digest... So this device does the same... once it's full of energy it disconnects itself from the source... (saving you some money on that light bill) check out the video after the break...

Outlet Regulator Video from conor klein on Vimeo.