Rooftop residential solar is having a moment in the sun, with one company reporting a 50 percent increase in sales. Lightforce Solar, a nationwide installer, is opening a new branch in Queenstown. The company says its sales are up 50 percent this month on the same time last year. Figures from the Electricity Authority also show in the 12 months to March, there have been 10,344 new residential solar installations, up four percent on the previous 12 month period. Canterbury is leading the pack with 2101 new residential solar installations, followed by Auckland with 1200 and Wellington with 1099. John Harman, owner of Light Force Solar, spoke to Lisa Owen.