Rooftop solar panels are attracting a new demographic of customers who are choosing to lease rather than buy, and enjoying the low upfront costs and immediate savings. The new third-party-lease business model lets homeowners save money the very first month, rather than breaking even a decade later after an initial investment of $10,000 or $20,000. Analysts with the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) found that the solar lease models are surging in southern...