Should consumers pay more for renewable energy in order to promote a certain technology? That’s an interesting question raised by California regulators on Thursday, when they approved what they acknowledged to be a pricey contract for Abengoa Solar to sell power to Pacific Gas & Electric.

The California Public Utilities Commission voted 4-1 to approve the 25-year contract, which will allow Abengoa to build the 280-megawatt solar farm called Mojave Solar in southern California. The company already has secured construction permits from state and federal regulators, as well as a $1.2 billion loan guarantee from the U.S. Department of Energy to help pay up to 80 percent of the project’s cost.

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Householders who are in the process of having solar panels put on their roof have six weeks to complete the job or face seeing the predicted income they generate slashed after the government said it was cutting feed-in tariffs by 50%.

Despite pledging to be “the greenest government ever”, the Tory-led coalition last week shocked the renewables sector by announcing that only installations completed by 12 December would get the full payments they were promised. Hundreds of householders who had signed contracts to have panels fitted have now pulled out and others are expected to follow.

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Why we are asking this now?

Solar energy does not require any introduction as a potential source of renewable energy. Sunlight is plenty through out the year in tropical and subtropical regions. And these regions consist all most 50 percent of total land mass in the world. So, if solar energy is harnessed efficiently along these areas, energy generation would become lot greener in future.

However, today’s solar technology has too many problems starting from capturing sunlight to storage and distribution of generated electricity. For power generation, generally, two types of technologies are used – photovoltaic and solar thermal type. And both the technologies are expensive to install. Photovoltaic cells are made of expensive silicon compounds while the thermal type system requires huge parabolic structures to concentrate heat.

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Some solar devices, like calculators, only need a small panel of solar cells to function. But supplying enough power to meet all our daily needs would require enormous solar panels. And solar-powered energy collected by panels made of silicon, a semiconductor material, is limited — contemporary panel technology can only convert approximately seven percent of optical solar waves into electric current.

Profs. Koby Scheuer, Yael Hanin and Amir Boag of Tel Aviv University’s Department of Physical Electronics and its innovative new Renewable Energy Center are now developing a solar panel composed of nano-antennas instead of semiconductors. By adapting classic metallic antennas to absorb light waves at optical frequencies, a much higher conversion rate from light into useable energy could be achieved. Such efficiency, combined with a lower material cost, would mean a cost-effective way to harvest and utilize “green” energy.

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