http://anonhq.com/9th-grader-develops-12-machine-that-produces-renewable-energy-from-ocean-currents/9th Grader Develops $12 Machine That Produces Renewable Energy From Ocean Currents
Hannah Herbst designed an ocean probe capable of powering desalination pumps in third-world countries.
Excerpts:
...The recently-designed energy probe is made of recycled materials and costs just $12. It consists of a 3D-printed propeller, connected by a pulley inside a plastic PVC pipe to a hydroelectric generator, which converts the mechanical movement of ocean currents to usable electricity.
... Unlike large-scale ocean energy projects, the tiny system doesn't
generate a lot of electricity. But Herbst says it's enough power to run a
small desalination machine, turning ocean water into safe drinking
water.
...Because the main parts are made from recycled materials, Herbst
thinks the machine could easily be made anywhere. "When I'm done
developing it, I'm going to open source it," she says. "Everybody in the
world can have access to the materials list and the data I
got—everything you need to make this device."