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Marcellus Shale plant opens in southwestern Pa.

HOUSTON, Pa. — A joint venture to draw natural gas from the Marcellus Shale formation, which includes Butler County in southwestern Pennsylvania, has a gas processing plant up and running south of Pittsburgh.

The facility near Route 519 near Houston, Washington County, can process 30 million cubic feet of natural gas each day.

The plant is a joint venture of MarkWest Energy Partners LP, of Denver, and NGP Midstream & Resources LP, a private equity firm based in Houston, Texas.

The plant is about 15 miles south of Pittsburgh.

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