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Submission + - Towards a 50% Efficient Solar Cell

necro81 writes: IEEE Spectrum magazine has a feature article describing DARPA-funded work towards developing a solar cell that's 50% efficient, for a finished module that's 40% efficient — suitable for charging a soldier's gadgets in the field. Conventional silicon and thin-film PV tech can hit cell efficiencies of upwards of 20%, with finished modules hovering in the teens. Triple-junction cells can top 40%, but are expensive to produce and not practical in most applications. Current work by the Very High Efficiency Solar Cell program uses optics (dichroic films) to concentrate incoming sunlight by 20-200x, and split it into constituent spectra, which fall on many small solar cells of different chemistries, each tuned to maximize the conversion of different wavelengths.
Google

Submission + - Google Applies to become Energy Marketer

necro81 writes: Google consumes massive amounts of electrical energy to power its data centers across the country and world. Now it has created a subsidiary, Google Energy LLC, and applied (pdf) to the Federal Energy Regulatory Commission to become a utility-scale energy trader. Google's stated aim is to be able to purchase renewable energy directly from producers at bulk rates, pursuing its goal of becoming carbon neutral. It is likely that Google Energy would also permit Google's own renewable energy projects to sell their energy at more favorable rates. Google reportedly does not have plans to actively become an energy broker, a la Enron.

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