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WhiteWater, MPLX and ONEOK and Enbridge to Construct Eiger Express Pipeline

08.25.25

Simpson Thacher represented WhiteWater Midstream LLC (“WhiteWater”) in connection with the formation of a joint venture with MPLX LP and ONEOK, Inc. to construct the Eiger Express Pipeline, through their existing joint venture with MPLX, ONEOK and Enbridge Inc. for the Matterhorn Express Pipeline.

The Eiger Express Pipeline is designed to transport up to 2.5 billion cubic feet per day (Bcf/d) of natural gas through approximately 450 miles of 42-inch pipeline from the Permian Basin in West Texas to the Katy area. Supply for the Eiger Express Pipeline will be sourced from multiple connections in the Permian Basin, including gas processing facilities in the Midland Basin, and from the Delaware Basin via the Agua Blanca Pipeline, a joint venture between WhiteWater, Enbridge and MPLX.

The Eiger Express Pipeline will be constructed and operated by WhiteWater and is expected to be in service in mid-2028, pending the receipt of customary regulatory and other approvals.

WhiteWater is an Austin, Texas-based infrastructure company and operator of multiple gas transmission assets, including the Matterhorn Express Pipeline and the Eiger Express Pipeline.

The Simpson Thacher team included Shamus Crosby, Katy Lukaszewski, Breen Haire, Tushar Parashar, Gavin Jaco, Jacob Bryant, John Carter and Kimberly Jacobs (Corporate); and Adam Arikat and Elizabeth Trask (Tax).