How so? This captures otherwise-wasted kinetic energy. It also has a zero carbon footprint so that funds that would be used for carbon mitigation would be saved. Also, it produces water more cheaply than standard methods. That equates to $40,000 per million cubic meters of water for active coastlines. In government budgetary terms that's a drop in the bucket. Hawai'i comes to mind.
Sounds interesting, the sooner the world gets away from fossil-fuels, the better it will be for all of us.
