An Iowa-based utility is trying to broaden its reach to bring natural gas customers lower prices. Des Moines-based MidAmerican Energy is proposing to build a 745-mile pipeline from far northern Alaska to link up with an existing pipeline on the Canadian border to bring a new natural gas supply to the U.S. The six-point-three billion dollar pipeline would tap into previously untouched natural gas supplies in Alaska and deliver them to the “lower 48” states. A MidAmerican spokesman says there are proven reserves of natural gas on Alaska’s North Slope that exceed 35-trillion cubic feet. The pipeline project would have an initial capacity of approximately four-point-five billion cubic feet of gas per day. The spokesman says the much greater supply should eventually lower costs for consumers. MidAmerican’s subsidiaries already own some 18-thousand miles of pipeline, making it the nation’s second-largest interstate natural gas transmission company.