The robot's power source could come from such diverse sources as waste products like wood chips or grass clippings, vegetable oil or even gasoline, diesel, kerosene and alcohol. All of this will take place outside the actual robot, as the radial 6-cylinder 16-horsepower Cyclone Waste Heat Engine will recharge the robot's battery pack through the use of a generator. If successful, such a device could have wide ranging civil and military applications. We shudder to consider all of them.
[Source: Green Car Congress]