Two California towns are mandating installations, and demand for the systems that generate electricity at home will jump 56 percent nationwide this year,according to the Solar Energy Industries Association. "In the next six months, homebuilders in California and the expensive-energy states will be going solar as a standard,and just incorporating it into the cost of the house like any other feature," Jim Petersen, chief executive officer of the PetersenDean Inc., the largest closely held U.S. roofing and solar contractor, said in an interview. Lashing panels to roofs during construction is about 20percent cheaper than after a house is built. Homeowners...
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