A new study this month suggests solar energy in Rhode Island is saving electricity ratepayers money. Solar companies think there are more savings and business to be had — especially on the commercial side — with the rollout of a new state incentive program that could pump an estimated 160 megawatts into the grid over the next five years. The study, conducted by the nonprofit Acadia Center, looked at six solar-energy systems in Rhode Island and estimated solar power in the grid saves ratepayers between 19 and 25 cents per kilowatt hour, largely because it produces an alternative energy resource during hours of peak demand…