Wave Energy - One of the many ways the Earth generates power without burning something.

The ocean produces a tremendous amount of power 24-7. Wave energy is frequently captured with buoys that rock with the waves, and also involve a great deal of steel. This is one that uses a long, rubber, under water tube called the Anaconda: As waves push against the tube, a surge of water forms and is pushed all the way to the back of the tube where it hits a turbine. http://www.treehugger.com/renewable-energy/giant-rubber-snake-anaconda-could-bring-cost-of-wave-power-down.html