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Efficient Storage of Wind Energy is in the Bag

Researchers in Denmark have succeeded in storing wind energy in giant synthetic bags, reports the Danish trade newspaper Ingeniøren.

The research project, based in Southern Jutland, has been filling massive air bags buried under sand dunes using wind-powered compressors.

The compressed air is then released to generate power using a pump and turbine system similar to those used for storage in lakes, according to the newspaper’s account.

An initial test, carried out in a 5-metre by 5-metre engine room, rated the efficiency of the storage method at 97%. A later, larger-scale test recorded a figure of 99.5%.

Researchers said the toughest challenge is making sure the massive air bags can cope with repeated inflation and deflation.

"‘But the synthetic membrane has proved to be unproblematic," Ole Hededal, a lecturer at the Technical University of Denmark, told the paper.

"In our tests the bags only stretched 0.5%, and they're made to tolerate tension of up to 14%."

The final phase of testing will use a 50-metre by 15-metre air bag, intended to hold up to 34 kW of wind energy.



Rooftop Solar Panels

Hypocrisy? While Buffett Champions Renewables, His Company Fights Rooftop Solar

Mark Chediak, Noah Buhayar and Margaret Newkirk, Bloomberg Warren Buffett highlights how his Berkshire Hathaway Inc. utilities make massive investments in renewable energy. Meanwhile, in Nevada, the company is fighting a plan that would encourage more residents to use green power.
Renewable Energy Finance

Clean Energy ETFs Are on a Tear

Eric Balchunas, Bloomberg Green investing used to be synonymous with losing money. But while the S&P 500 Index is up 2 percent this year, and the MSCI All-Country World Index is up 5 percent, clean energy ETFs have double-digit re...

Wheels, Towers and Trees: Unconventional Renewable Energy Technologies in the Pipeline

Andrew Williams, International Correspondent A number of companies around the world are developing novel technologies in an effort to grab a slice of the global renewable energy market.  Although many of these technologies are simple incremental improvements to e...
UK Parliament Clean Energy Leaders

UK Government Names Clean Energy Cabinet Members

David Appleyard, Contributing Editor With the UK general election now over and a majority Conservative Party government in place, the re-elected Prime Minister David Cameron has now named key members of the government charged with steering the UK’s clean energ...


Volume 18, Issue 3


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