Shop Talk: Commercial solar projects booming

Solar energy for commercial buildings is now growing at an annual rate of 25 percent. What does the average commercial solar installation cost? What is the lifespan of a solar array? How many years does it take to recoup the investment? And what is the number one objection among companies that decide against installing solar? Jaymes Callinan, co-founder and president of Vista Solar, discusses those questions and others during this interview. (04/2015)