Is this the ultimate in green energy? An electric eel's power has been harnessed in Japan to light a Christmas tree.
Some eels generate electric fields to detect prey in murky waters, by detecting disturbances in the electric field. By placing electrodes in the eels tank, the eel-power is made to flow through a circuit and light up a christmas tree.
This is cute, but I doubt we'll see eel-power used for industrial purposes.