Giant suction cup for creating green energy

This week's email brought this article from Grist about a new way to create electricity from wind.  I guess it's appropriate that the giant toilet plungers will be used in water, eh?  Gotta love the picture!

I'm still a fan of small local networks of energy production rather than the big grid but that's not going to be the first step.  The first step is feeding into the big grid with cleaner, less expensive energy sources and this is a less destructive part of that.