Economy: The cost of electric vehicles is low, only about one-fifth of gasoline vehicles. Moreover, the energy conversion efficiency is high, and at the same time, the energy during braking and downhill can be recovered, and the utilization efficiency of energy is improved. At night, the cheap "valley electricity" of the power grid is used for charging, which plays a role in stabilizing the peak-to-valley difference of the power grid. http://en.chtc-evemex.com/electric-boats-and-planes/