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Williams Companies is a midstream energy company that owns and operates the large Transco and Northwest pipeline systems and associated natural gas gathering, processing, and storage assets. In August 2018, the firm acquired the remaining 26% ownership of its limited partner, Williams Partners.
Kinder Morgan is one of the largest midstream energy firms in the US, with an interest in or an operator on more than 80,000 miles of gas, refined products, and carbon dioxide pipelines. The company also owns one of the largest portfolios of gas and refined products storage and terminals. Most of Kinder Morgan's cash flows stem from fee-based contracts for handling, moving, and storing fossil fuel products.