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MarkWest Energy Partners Announces a Long-Term, Fee-Based Agreement with XTO Energy to Transport, Fractionate and Market NGLs originating from XTO Plant in Butler County, Pennsylvania

DENVER--(BUSINESS WIRE)--Jul. 31, 2012-- MarkWest Energy Partners, L.P. (MarkWest) (NYSE: MWE) announced today that it has executed a long-term, fee-based agreement with XTO Energy, Inc. (XTO), a subsidiary of Exxon Mobil Corporation (NYSE: XOM), to extend MarkWest’s natural gas liquids (NGL) gathering pipeline in northwest Pennsylvania to XTO’s processing plant in Butler County, Pennsylvania, which is expected to commence operations in late 2012. MarkWest previously announced an extension of its Marcellus NGL gathering pipeline north from its Houston, Pennsylvania NGL fractionation and marketing complex to the Bluestone processing complex in Butler County, Pennsylvania, which MarkWest acquired in June of this year. The announcement today includes the further extension of the NGL gathering pipeline from the Bluestone processing complex to the XTO processing facility. MarkWest is currently operating three processing complexes in Pennsylvania and northern West Virginia to process rich Marcellus Shale gas production and is constructing two additional processing complexes in northern West Virginia. MarkWest is also constructing two processing complexes in Ohio to support rich-gas production in the Utica Shale. Each of the seven processing complexes will deliver NGLs into MarkWest’s extensive NGL gathering system that will transport the NGLs to either MarkWest’s currently operating Houston, Pennsylvania fractionation and marketing complex or its Harrison County, Ohio fractionation and marketing complex, which is expected to be operational in late 2013. When all of the previously announced facilities are completed, MarkWest will operate approximately 3.0 Bcf/d of gas processing capacity and approximately 270,000 barrels per day of fractionation capacity to support rich-gas production from the Marcellus and Utica Shale formations.

“There are vast potential reserves of rich-gas production in the Marcellus and Utica Shales in northwest Pennsylvania and northeast Ohio and one key to allowing our producer customers to maximize the value of those reserves is to ensure that the NGLs can be effectively gathered, fractionated and marketed into the premium northeast market. Our NGL pipeline extension to the XTO processing facility also ensures that XTO will have access to all of the Marcellus ethane projects,” stated Frank Semple, Chairman, President and Chief Executive Officer of MarkWest. “We have a great relationship with XTO and we are delighted to extend that relationship into the Marcellus.”

About MarkWest

MarkWest Energy Partners, L.P. is a master limited partnership engaged in the gathering, transportation, and processing of natural gas; the transportation, fractionation, marketing, and storage of natural gas liquids; and the gathering and transportation of crude oil. MarkWest has extensive natural gas gathering, processing, and transmission operations in the southwest, Gulf Coast, and northeast regions of the United States, including the Marcellus Shale, and is the largest natural gas processor and fractionator in the Appalachian region.

This press release includes “forward-looking statements.” All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Actual results could vary significantly from those expressed or implied in such statements and are subject to a number of risks and uncertainties. Although MarkWest believes that the expectations reflected in the forward-looking statements are reasonable, MarkWest can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect operations, financial performance, and other factors as discussed in filings with the Securities and Exchange Commission. Among the factors that could cause results to differ materially are those risks discussed in the periodic reports filed with the SEC, including MarkWest’s Annual Report on Form 10-K for the year ended December 31, 2011 and its Quarterly Report on Form 10-Q for the quarter ended March 31, 2012. You are urged to carefully review and consider the cautionary statements and other disclosures made in those filings, specifically those under the heading “Risk Factors.” MarkWest does not undertake any duty to update any forward-looking statement except as required by law.

Source: MarkWest Energy Partners, L.P.

MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
or
Nancy Buese, 866-858-0482
Senior VP & CFO
or
Josh Hallenbeck, 866-858-0482
VP of Finance & Treasurer
E-mail: investorrelations@markwest.com