Buoy house

Water views are expensive but living on the water is cheaper. Why not make and live on a buoy house with power generated from the seas or rivers currents. It could be anchored near a reef and set up with navigation lights and the like. You could be a one man rescue station if you like serving the community. The cost to make would be similar to a normal house with all the council fees and charges. Not to be confused with the shanty boat this would be a service you would supply free or a small charge to run the lights to the waterway users.