This growing midstream company still has a bright future.Energy Transfer (ET -1.22%) is considered by many to be a reliable income investment. It's a midstream company that operates over 135,000 miles of pipeline across 44 states, and it charges upstream and downstream companies to use its infrastructure with its "toll road" business model.The business operations are well-insulated from volatile commodity prices. As long as its customers keep their crude oil, natural gas, liquefied natural gas (LNG), and ot ...