Tulsa, OK-based midstreamer Williams said Thursday it has reached a deal to acquire MountainWest Pipelines Holding Co. from Southwest Gas Holdings Inc. in a $1.5 billion cash-and-debt transaction.

MountainWest comprises about 2,000 miles of FERC-regulated interstate natural gas pipeline systems located mainly in Utah, Wyoming and Colorado, with roughly 8 Bcf/d of total transmission capacity.

The MountainWest assets also hold 56 Bcf of natural gas storage capacity, including the Clay Basin underground reservoir, “providing valuable service to western markets,” according to Williams

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