For more than 40 years, scientists have dreamed of collecting the sun’s energy in space and beaming it back to Earth. Now, a host of technological advances, coupled with interest from the U.S. military, may be bringing that vision close to reality.

Despite the enormous promise of solar power, the drawbacks of the technology remain significant. People need electricity every day, around the clock, but there’s no part of the United States that is cloud-free 365 days a year — and no solar radiation at night. You have to find some way to store the energy for those sunless periods, and there’s not yet a large-scale way to do that.

Moreover, the best locations for solar arrays — the deserts of the American Southwest — are far from the centers of population, so even under the best of circumstances you’d have to send electricity many hundreds of miles through transmission lines that don’t yet exist.

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A group of recent Massachusetts Institute of Technology graduates has developed a roof tile that remains white in summer to reflect the sun’s energy then turns black in winter to absorb the sun’s rays and heat buildings.

The so-called “thermeleon” (rhymes with chameleon) technology uses a common commercial polymer trapped between layers of plastic, including a black layer at the back. When the temperature drops, the white layer disappears, exposing the black layer.

The MIT graduates say the tiles reflect about 80 percent of the sun’s heat when they are white, translating into a 20 percent savings in cooling costs. When the tiles turn dark, they absorb about 70 percent of solar energy.

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There had been rumors about it earlier this weeks on Globes, Israel’s financial newspaper. But the story was took down, I guess because of a leak.

Now General Electric has unveiled its good news finally, according to ABC News, that it is investing in the Israeli solar technology company SolarEdge. The company allows photovoltaic panels, which convert sunlight into power, to operate up to 25% more efficiently.

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Does that headline grab you? If not, these numbers should:

If that has not grabbed your attention yet, consider that in January of this year, Continental Airlines completed a test flight using a biofuel mixture, which included fuel derived from algae. The test flight yielded a 1.1 percent increase in fuel efficiency compared to a jet engine using traditional jet fuel.

That isn’t exactly a great leap forward, but achieving incremental increases in fuel efficiency coupled with the latest engine technology, as well as use of new materials in aircraft production, such as the Boeing 787, could signal a dynamic shift for the airline industry. (more…)

A recent Jewish Telegraphic Agency article by Dina Kraft on clean technology takes a good look at a number of projects by Israeli clean tech industries and Israel’s military branches in the realm of renewable and alternative energy.

“Beating swords into green plowshares in Israel,” the article talks about solar energy energy companies such as Bright Source Energy, which is involved in building solar energy plants in California’s Mojave Desert and other locations; and Rotem, which utilizes technologies developed in Israel’s aeronautical defense industry.

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A battle over whether to place wind turbines within sight of France’s famous abbey, Mont-Saint-Michel, has touched off a dispute within the country’s environmental community over the visual impact of the alternative energy source.

A coalition of local and national conservationists has opposed locating the wind turbines within view of the abbey on the Normandy coast, even though the windmills would be roughly 10 miles from Mont-Saint-Michel.

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Renewable energy and energy efficiency are key to solving crises in the economy, climate and security, said Al Gore on Friday (videos below).

The former vice president lauded fellow Nobel Peace Prize Laureate Barack Obama for efforts including an economic stimulus package with a significant renewable energy component.

“One way or another the reductions in emissions are about to accelerate,” said Gore at the conference of the Society of Environmental Journalists in Madison, Wis. “What is important, directly or indirectly, is that we put a price on carbon.”

He expressed hope that the U.S. Senate will pass a  bill similar to that of the House, even in advance of the U.N. Climate Change Conference in Copenhagen in December. “There is much more bipartisan dialogue behind the scenes than is publicly visible,” he added.

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Dow Chemical has developed a roof shingle that contains thin-film solar power cells and can be integrated into asphalt roofs, which are used in 90 percent of American homes.

Dow executives said the solar shingles can be handled like a regular asphalt shingle and can be nailed right onto a roof and walked on by roofers.

The company will begin test-marketing the shingles in mid-2010 and the company will initially target new home construction.

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The U.S. government has identified 4,100 contaminated industrial sites, covering more than 5 million acres, suitable for building wind, solar, and geothermal power installations.

With concern about renewable energy projects being built on pristine lands, the construction of wind and solar arrays on idle industrial “brownfields” could be an ideal solution, according to federal officials.

The Daily Climate reports that the U.S. Environmental Protection Agency and the National Renewable Energy Lab will begin conducting detailed studies of some sites this month and will hold five workshops with state and local leaders, renewable energy developers, and conservation groups to discuss constructing alternative energy installations on brownfields.
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A growing number of U.S. colleges and universities supported green initiatives during the last year despite declining endowments, according to a report released by the Sustainable Endowments Institute.

Twenty-six of 332 schools evaluated in the College Sustainability Report Card received the highest-possible grade of A-minus through sustainable management of campus operations and endowment practices.

Now in its fourth year, the College Sustainability Report Card evaluates schools in nine categories, including climate change and energy, food and recycling, and green building.

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