Even though that doesn't amount to a huge amount of energy (the 12kW of electricity is only enough to power a few homes, for instance), it is nonetheless highly efficient. The real obstacle to the implementation of the Solar Sunflower is its cost. Its gallium-arsenide photovoltaic cells, though more efficient than standard PV cells, are not cheap. Add up construction costs and the costs of the fancy cooling system, and the design isn't going to be able to financially compete with less innovative but sure-fire solar energy harvesters already on the market.Read more: http://www.mnn.com/earth-matters/energy/stories/solar-sunflower-technology-harnesses-power-5000-suns#ixzz3kTCnj3Hh
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