Ned Lamont on Tuesday suggested that United Illuminating may soon agree to postpone a final decision on the utility’s controversial plan to erect a new transmission line through sections of Fairfield and Bridgeport. The company has argued that its proposal to build the transmission line on top of what are known as monopoles is the most cost-effective option for ratepayers. In addition, they said the 19 acres needed for easements to construct the transmission line violated the property rights of owners. Officials in both Bridgeport and Fairfield are planning to hold a press conference Wednesday asking the siting council to delay its vote. A representative for the siting council did not immediately respond to a request for comment on Tuesday.