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Wind power project goes deeper out to sea

Windmills anchored on the high seas could produce electricity starting in 2007 in a program likely to please critics who reckon that land-based turbines are an eyesore, Norwegian energy group Norsk Hydro said on Wednesday.
Norsk Hydro released this illustration of what its anchored windmill would look like when it is deployed offshore.
Norsk Hydro released this illustration of what its anchored windmill would look like when it is deployed offshore.Norsk Hydro
/ Source: Reuters

Windmills anchored on the high seas could produce electricity starting in 2007 in a program likely to please critics who reckon that land-based turbines are an eyesore, Norwegian energy group Norsk Hydro said on Wednesday.

Out of sight over the horizon, parks of non-polluting windmills could eventually supply power to coastal cities or to offshore oil and gas platforms anywhere from the North Sea to the Gulf of Mexico.

Hydro said it aimed to go ahead with a project to build a North Sea prototype -- an upright steel and concrete tube about 660 feet tall with 250 feet jutting above the water and rotor blades 200 feet long -- after successful laboratory tests.

Some nations have parks of windmills that stand in shallow waters offshore but none have windmills far from land.

‘Promising’ so far
“The results are promising,” Alexandra Bech Gjoerv, head of New Energy at Hydro, told Reuters of a three-year research program. “We’re very hopeful that we can be first in the world to set up a floating windmill at sea.”

She said rivals in nations from Japan to the United States were also working on designing similar windmills.

Hydro, Norway’s number two oil producer behind Statoil, hopes to deploy a prototype at sea in 2007, likely to cost about $23 million.

Norway is the world’s third largest oil exporter after Saudi Arabia and Russia.

The floating windmills would be tethered at three points to the seabed to keep them stable. The anchoring technology is widely used to build oil platforms.

Costs, benefits
Bech Gjoerv said electricity from offshore windmills was likely to cost more than electricity from fossil fuels, nuclear or big hydropower plants. Maintenance costs could be higher.

“Initially we want to compete with windmills on land. It’s a lot more windy out at sea -- installation costs will be higher but the production will be higher,” she said.

But there are also likely to be fewer objections to windmills offshore, Bech Gjoerv said. “On land there are objections partly to visual pollution, partly problems with birds and other environmental issues like laying cables through the countryside,” she said. Birds are sometimes killed by flying into windmill blades.

Each 5-megawatt windmill would be capable of generating about 22 gigawatt hours a year. That would be enough to supply electricity to about 1,000 typical Norwegian homes.

If the concept works, Hydro envisages parks of perhaps 200 windmills, in waters 700-2,200 feet deep.

“We’re using a tested platform concept, windmill technology that’s well known and an anchoring system that is known. It’s a radical adaptation of the technology,” Bech Gjoerv said.