A gas turbine stripped down to nothing but its casing brings to mind a scene from an automaker’s assembly line: an empty chassis that’s full of potential. Next year, a GE team will seek to realize such potential at the 435-megawatt Tallawarra A power station, 60 miles south of Sydney on the New South Wales coast. The goal is to transform an existing GE turbine there into one that will be more efficient and require less natural gas to generate electricity.