Antero Midstream Corp. plans to acquire the Marcellus Shale natural gas gathering and compression assets owned by Crestwood Equity Partners LP (CEQP), the companies reported Monday.

The $250 million bolt-on acquisition, which requires regulatory approval, would boost Appalachian Basin pure-play Antero’s gas compression capacity by 20% and gas compression mileage by 15%, said management.

CEQP entered the Appalachian Basin with its 2012 purchase of the assets, located in the rich gas core of the southwestern Marcellus.

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The assets span 140,000 acres in Doddridge and Harrison counties, WV, and include 72 miles of dry gas gathering pipelines...