WGL Holdings, Inc., a public utility holding company, sells and delivers natural gas; and provides energy-related products and services. The company operates through four segments: Regulated Utility, Retail Energy-Marketing, Commercial Energy Systems, and Midstream Energy Services. The Regulated Utility segment sells and delivers natural gas to retail customers; and owns interests in underground natural gas storage facilities, including pipeline delivery facilities located in and around Hampshire County, West Virginia. The Retail Energy-Marketing segment sells natural gas and electricity directly to residential, commercial, retail, and industrial customers. The Commercial Energy Systems segment provides clean and energy efficient solutions, such as commercial solar, energy efficiency, and combined heat and power projects, as well as other distributed generation solutions to government and commercial clients. This segment also focuses on upgrading the mechanical, electrical, and water and energy-related infrastructure of governmental and commercial facilities by implementing traditional and alternative energy technologies. The Midstream Energy Services segment acquires, invests in, manages, develops, and optimizes natural gas storage and transportation midstream infrastructure projects. As of September 30, 2018, the company had approximately 576 miles of transmission mains; 13,188 miles of distribution mains; and 12,449 miles of distribution services, as well as served approximately 108,900 natural gas customers and approximately 101,700 electricity customers located in Maryland, Virginia, Delaware, Pennsylvania, and District of Columbia. WGL Holdings, Inc. was incorporated in 2000 and is headquartered in Washington, District of Columbia. WGL Holdings, Inc. operates as a subsidiary of Wrangler 1 LLC.