An electric bike does double duty as a home electricity generator

Ride this e-bike around town, and then park it in your living room and generate clean electricity.

A 20" folding e-bike can be cycled just like any other e-bike, with a 350W rear hub motor for pedal-assist or throttle-based electric riding, a removable 36V 10 Ah lithium-ion battery, a top speed of 20 mph, and a range of 20-30 miles per charge, but they also come with a heavy duty stand that allows the bikes to be used as pedal-powered generators. These bikes can produce anywhere between 30 and 100 watts, depending on the rider, which can go directly back into the home via a standard wall outlet. Granted, this isn't nearly enough power to take your home off of the grid, by any means, but it is a way to cleanly charge or offset the electricity of a number of small electronics devices.