Associated Press: The parent company of Central Maine Power is selling three natural gas utilities in New England to help pay for a $1.4 billion power grid upgrade in Maine that’s aimed at assuring reliability and creating capacity for future wind power projects in the state. Utility company UIL Holdings said Tuesday that it will buy Southern Connecticut Gas Co., Connecticut Natural Gas Corp. and the Berkshire Gas Co. from Iberdrola USA for $885 million. Under the deal, UIL Holdings also will take on …