There are electricall powered craft out there which work well. Indeed, the Nancy Olfield Trust's cruiser 'Whie Admiral' is one, and their two 'Bass boats' have electric auxilliary power.
Of Course, the Trust have their own charging facilities at the base, but should any private need to charge their propulsion batteries from one of the BA points, they would almost certainly need to join the queue behind those using hair dryers etc.....