A wave of power plant replacements could treble GE's turbine business by 2040.: John Flannery’s breakup plan will trim General Electric down to three businesses, each of which are built around the manufacture and sale of equipment that shares the common theme of spinning around and making electricity. First wind turbines ($9 billion annual sales), then airplane engines ($27 billion), and at the base of the business: power plants that burn natural gas ($35 billion). Is that a shaky base on which to rebuild? A boom in solar power has gutted the gas turbine business in recent years. Last year power division profits fell 45%.