Methane Emissions from Transmission Harm American Neighborhoods and the Environment Act or the METHANE Act This bill requires operators of distribution pipelines to use advanced leak detection technology to detect and repair leaking pipelines, including high sensitivity methane detectors mounted on a vehicle or aircraft that is equipped with global positioning system technology. The bill also requires operators to report to the Department of Transportation any event that involves a release of gas from a pipeline facility that results in an unintentional estimated gas loss of 50,000 cubic feet or more.