“the decline appears to be continuing apace this year, according to the researchers: ‘Within the first six months of 2013, PV system prices in California fell by an additional 10 to 15 percent, and the report suggests that PV system price reductions in 2013 are on pace to match or exceed those seen in recent years.’

Utility-scale systems are also becoming cheaper. ‘Utility-scale systems installed in 2012 registered even lower prices, with prices for systems larger than 10,000 kW generally rang...