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Flywheel energy storage

http://en.wikipedia.org/wiki/Flywheel_energy_storage NASA G2 flywheel
http://www.vyconenergy.com/pages/flywheeltech.htm Flywheels have been used since the Bronze Age as a way to store kinetic energy. Today, with new high speed motor technology, VYCON has developed highly efficient flywheel systems which provide consistent, dependable energy for a variety of important applications.

VYCON - Flywheel Technology

Wave Power - Energy from ocean surface waves

http://www.alternative-energy-news.info/technology/hydro/wave-power/ 17Mar Generating Electricity from Wing Waves Just like wind mills and wind turbines that generate power and electricity from the wind, scientists are now working to generate power from the sea.