Waste Management Inc was incorporated in Oklahoma in 1987 under the name USA Waste Services, Inc. and was reincorporated as a Delaware company in 1995. In a 1998 merger, the Illinois-based waste services company formerly known as Waste Management, Inc. became a wholly-owned subsidiary of the Company and changed its name to Waste Management Holdings, Inc. (WM Holdings). At the same time, its parent holding company changed its name from USA Waste Services to Waste Management, Inc. The Company is the provider of comprehensive waste management environmental services. It partners with its residential, commercial, industrial and municipal customers and the communities it serves to manage and reduce waste at each stage from collection to disposal, while recovering valuable resources and creating clean, renewable energy. Through its subsidiaries, it is also a developer, operator and owner of landfill gas-to-energy facilities in the United States. The Wheelabrator business provided waste-to-energy services and managed waste-to-energy facilities and independent power production plants. The Company owns or operates 252 landfill sites. The Company competes with governmental, quasi-governmental and private sources in all aspects of its operations.