Name: Energy 101: Marine and Hydrokinetic Energy
Uploaded: 2014-03-26T04:09:22.000Z
Duration: 3 min 1 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

We all know energy can come from the wind and the sun, but there's a plentiful renewable

resource covering more than 75% of the planet that you might not have thought about: our

water! The movement of the ocean's waves, tides,

and currents carries energy that can be harnessed and converted into electricity to power our

homes, buildings and cities. The energy available in this moving water

is called kinetic energy. Scientists and engineers are learning to capture clean renewable ocean

power using marine and hydrokinetic technologies. Water currents occur naturally all over the

planet. Waves crash against coastlines. Tidal currents ebb and flow and large currents move

water all around our oceans. We can tap into each one of these sources

to generate electricity. It's estimated that along U.S. coastlines, there is enough energy

in waves and tides to meet a significant portion of America's power needs.

So, how does it work? That depends on what kind of hydrokinetic power you're trying to

capture, but the concept is essentially the same: extracting power from moving water.

For example, a buoy can harness energy from the vertical rise and fall of ocean waves,

as well as back-and-forth and side-to-side movements.

Currents and tides can also spin a turbine in various directions as water moves through

an ocean power device, generating electricity. The Energy Department is supporting research

on a range of innovative turbine technologies to capture energy from waves, river, and tidal

currents. Devices that operate in water have to work

under turbulent and harsh conditions. They must be built to withstand strong currents

and impacts from debris carried in the water. Of course, they also have to be designed to

preserve the integrity of the marine environment. One of the greatest benefits of developing

marine energy or, ocean power, is that many of our water resources are right where we

need them -- near the most populated areas. More than half of all Americans live close

to coastlines where the potential for ocean power is the greatest, and some cities and

towns can use power from tidal currents. Marine and hydrokinetic technologies are still

a ways off from widespread adoption. But today, dozens of organizations are already working

to deploy ocean power systems throughout the world.

Marine and hydrokinetic technology: a new wave in harnessing clean, renewable energy

from all sorts of water resources right here at home.