This is the second science article I have linked to in less than two weeks from Fox News. Huh.
Anyway, this one is about getting energy from the motion of water, as in droplets moving across a transducer. The researchers think this will apply anywhere that there is movement of water. Outsides of houses (probably cars, too), rivers, the ocean, even a flushing toilet.
I wonder how clean you have to keep the surface. That’s got to be a limiting factor here.