WGL Holdings, Inc. (WGL) is a holding company. The Company operates through four segments. The Regulated Utility segment consists of Washington Gas Light Company, which provides regulated gas distribution services to end use customers and natural gas transportation services to an unaffiliated natural gas distribution company and Hampshire Gas Company, which provides regulated interstate natural gas storage services. The Retail Energy-Marketing segment consists of the operations of WGL Energy Services, Inc., which sells natural gas and electricity directly to retail customers. The Commercial Energy Systems segment consists of the operations of WGL Energy Systems, Inc., WGSW, Inc. and the results of operations of affiliate-owned commercial distributed energy projects. The Midstream Energy Services segment consists of the operations of WGL Midstream, Inc., which engages in acquiring, investing in, managing and optimizing natural gas storage and transportation assets.