| http://www.w3.org/ns/prov#value | - The figures do not account for incentives such as state or federal tax credits that can affect the cost.Ken Johnson, a spokesman for the solar association, said in a statement that solar systems have seen dramatic price declines" in the last few years.he is good for utilities in California, which must obtain a third of their electricity from solar and other renewable sources by 2020.The Ivanpah
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