Buying a rooftop solar array costs in the neighborhood of $30,000 depending on the size, before a 30 percent federal tax rebate and state incentives. Solar panels themselves, though, are far less than half the cost of the entire system. Installation is about half the overall cost and other hardware, such as inverters, figures in as well.
The research company projects that grid parity will come to commercial rooftop solar installations first, with 10 countries reaching that point by 2016. Hawaii, which has the highest electricity rates in the U.S., is the exception with residential grid parity expected this year.
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