WGL Holdings, Inc., is a public utility holding company that serves more than 1 million customers in the District of Columbia, Maryland, and Virginia. A subsidiary of AltaGas, it provides natural gas, electricity, sustainable energy, carbon neutrality and energy services, and also is engaged in natural gas exploration, production, and storage. The company operates four divisions: Washington Gas, WGL Energy, WGL Midstream, and Hampshire Gas. - Source: Wikipedia