US solar-energy installations spiked during the third quarter of 2011, according to a joint report by the Solar Energy Industries Association in Washington DC and GTM Research, headquartered in Boston, Massachusetts. Declining module prices have aided the boom, but the rush was also driven by a federal programme that provides solar-investment tax credits in the form of cash grants. Although the tax credit will continue until 2016, the cash-grant programme is due to expire at the end of this month.
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