2 Photos by Catherine Meredith, The Morning Call Graphic by AP Sources: Massachusetts Electric Co.; National Grid USA Service Company Inc.; 1. [Paul Stepanoff] stands next to solar panels he installed outside his home in Haycock Township. The system cost $15,000 to install and will pay for itself in 15 years. Excess power generated is sold to PPL. 2. A BATTERY PACKin the basement+ of Paul Stepanoff's Haycock Township home is fully charged in case of power outages. 3. Graphic - RUNNING ON RAYS: While only a fractions of 1 percent of the country's power generation comes from the sun, energy experts hope solar power will be more + common in the homes and businesses of the future. Here's a typical setup: