Tortoise Midstream Energy Fund, Inc. operates as a closed-end investment fund. The firm engages in the natural gas infrastructure master limited partnerships. It also owns and operates a network of pipeline and energy-related logistical infrastructure assets with an emphasis on those that transport, gather, process, and store natural gas and natural gas liquids. The company was founded on April 23, 2010 and is headquartered in Overland Park, KS.