Name: Wave Power Could Be Energy's Next Big Leap
Uploaded: 2021-05-17T08:28:02.000Z
Duration: 10 min 57 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...

Adverbs of manner

that the oceans are actually the largest battery.

We're storing huge amounts of energy in the oceans.

It can extend down several hundred meters,

and once it gets to the near shore, from about 50 meters,

the whole water column is moving backwards and forwards.

As we search for ways to reduce our reliance

to a largely untapped potential source of renewable energy.

In theory, waves off the coast of the United States alone

could generate over two trillion kilowatt hours

enough to power more than half of the country.

Waves intensify and subside not as quickly as the wind,

One of the potential advantages of wave energy is

that it could act as a complementary source of power,

if it were to be scaled up to a commercial scale.

and financial challenges have complicated their efforts.

there were a spate of bankruptcies in the sector,

of kind of continuous proven projects out at sea

to develop the technologies at a steadier pace

Is wave energy just a novelty or something

that can become a major renewable energy source?

The sea is a very challenging environment

So seawater is corrosive and conditions are very rough.

and it increases operating and maintenance costs.

many early wave energy projects hit rough waters,

such as the Pelamis wave energy converter in Portugal

and the Islay LIMPET project in Scotland,

but that hasn't stopped others from trying.

Companies are focused on testing projects out at sea,

proving their durability, trying to raise capital

Finland-based AW Energy is a veteran in the sector.

The first proof of concept of the company's device

was made in the '90s after diver Rauno Koivusaari

observed the strong back and forth movement of a hatch cover

The waves are generated far from the coastline.

So the wind blows on the surface of the water

And that rotation extends deep down below the surface

this rotational energy turns into an elliptical energy

that you probably have noticed if you've been swimming

on the seashore in large waves, you're pulled in and out.

but there's a sweet spot where we deploy.

So around 10 to 15 meters of water depth,

that's where there's still strong wave energy coming in.

After years of research, prototyping and testing,

a 350-kilowatt device in the waters off Portugal.

and 10-meter high steel panel fixed to the seabed

The panel moves back and forth with the waves,

so it's protected from the extreme waves.

We generate electricity by capturing the movement

in a machine room underneath the surface.

That hydraulic energy we turn to electricity

with hydraulic accumulators and hydraulic motors,

The WaveRoller has survived large waves at sea

for over a year and delivered electricity

via an underwater cable to the grid in Portugal.

Meanwhile, the company has won a 2.5 million Euro grant

to work on an upgraded version of the WaveRoller,

aiming to increase the electricity generation capacity

The upscaled device would have a bigger panel,

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Wave Power Could Be Energy's Next Big Leap

potential

eventually

approach

significant