Wave Garden by Yusuke Obuchi

As an alternative to nuclear power and other conventional energy sources, the Wave Garden is an electric power plant that derives energy from the movement of ocean waves. Its piezo-electro membrane is a flexible electric generator, where bending the material or applying stress creates an electric charge. Conversely, applying electric current to the membranes causes it to deform. Monday through Friday, it generates energy, but at the weekends, the Wave Garden changes into a public garden - thus changing from a space of production to one of recreation and consumption. During the weekends, selected areas lift above the surface of the ocean, acting as a ceiling under which boats approach the entrances.

(via experimentsinmotion)

And maybe combining with solar panels?