Oceans, which cover more than 70% of Earth's surface, offer vast potential for clean energy from renewable resources such as ocean currents and waves.

Ocean currents here reach power densities above 2,500 watts per square meter, making them 2.5 times stronger than top wind energy sites.

Some of the fastest ocean currents in the world have been discovered off South Africa, Somalia, Kenya, Tanzania and Madagascar. These can be used to generate energy.

Until now, a global evaluation of ocean current energy with actual data was lacking. Using 30 years of NOAA's Global Drifter Program data, a study shows that ocean currents off Florida's ...

Unlike wind or solar energy, ocean currents flow steadily and predictably, providing consistent power production. Still, harvesting ocean energy is just beginning.