Concrete Energy Storage Spheres
Youtube text: Uploaded June 6, 2013 – MIT has patented an energy storage system it posits makes offshore wind energy more sustainable. The intermittent and unreliable nature of wind energy makes the green energy source untenable in certain conditions. By anchoring offshore wind turbines with 30 meter diameter hollow concrete spheres, scientist believe they have created a way to extend the generation power of the wind turbines. During peak energy production periods, excess energy produced by the wind turbines is used to pump seawater out of the spheres, which sit on the seafloor. During slack periods, a valve in the spheres are opened and seawater rushes in, spinning a turbine also connected to the grid. This video shows how the concrete energy storage spheres would work.