Solar energy is going to play an increasingly important role in the next 20 years, Georgia Public Service commissioners said Monday during a panel discussion of the state’s solar industry. The commission is wrapping up hearings on Georgia Power Co.’s 2013 integrated resource plan, which is a long-range plan for the utility that forecasts electric power needs for the next three years. The commission, a state agency that regulates utilities, is expected to issue a decision on the plan July 11.