Caterpillar Lands Milestone MarkWest Order; Over 70 Cat® G3600 gas compression engines ordered

Houston, TX – Caterpillar Oil & Gas is pleased to announce MarkWest Energy Partners L.P. has ordered over seventy Cat® G3600 engines, the company’s flagship series for gas compression applications. A combination of G3608 engines rated at 2370 hp and G3612 engines rated at 3550 hp will be used to support natural gas gathering operations across the Utica Shale and Marcellus Shale formations. Initial shipments of the gas compression package systems are scheduled to begin in early 2014 with deliveries scheduled throughout the year. AG Equipment, based in Broken Arrow, Oklahoma, has been awarded a contract for initial packaging of this equipment. AG Equipment along with Cat dealer Warren Cat led Caterpillar’s efforts on the sale. Cat dealers Cleveland Brothers and Ohio Cat are coordinating after sale support services.

“This order is a significant achievement for Caterpillar in the gas compression industry,” Dave Dunlevy, Caterpillar Oil & Gas general manager stated. “It is one of our largest orders of G3600s for gas compression and we are appreciative of MarkWest for their continued support of our industry-leading power solutions and unparalleled service provided by the Cat dealer network."

 “We are pleased to work with Caterpillar Oil & Gas to expand our gathering and compression footprint in the Northeast,” stated Frank Semple, Chairman, President, and Chief Executive Officer at MarkWest. “The installment of quality Caterpillar technology will be critical to support the continued development of producers’ rich-gas acreage in the heart of two of America's most prolific shale plays.”

Manufactured in Lafayette, Indiana, Cat G3600 engines for gas compression have logged 140 million operating hours around the world. Built using the proven Cat diesel platform, the gas-fueled G3600 units stand up to the most demanding natural gas applications, delivering 1775 to 4735 hp, with virtually no unscheduled downtime. In addition to the proven power ratings, the G3600 engine’s efficiency and technology result in longer overhaul intervals and reduced maintenance.

Interested in our gas compression solutions? Visit us at the upcoming GCA Show in Galveston, Texas, April 7th - 9th as well as at the GPA Show in Dallas, Texas, April 13th - 16th. For up to the minute information on Caterpillar Oil & Gas, follow us on Facebook: http://www.facebook.com/caterpillaroilandgas & Twitter: http://www.twitter.com/catoilandgas. For more information on the comprehensive gas compression solutions Caterpillar offers, please visit catoilandgasinfo.com  or watch a short video on our product portfolio for gas compression

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About MarkWest Energy Partners, L.P.

MarkWest Energy Partners, L.P. is a master limited partnership engaged in the gathering, processing and transportation of natural gas; the gathering, transportation, fractionation, storage and marketing of natural gas liquids; and the gathering and transportation of crude oil. MarkWest has a leading presence in many unconventional gas plays including the Marcellus Shale, Utica Shale, Huron/Berea Shale, Haynesville Shale, Woodford Shale and Granite Wash formation.

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 (SEC).  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, 2012 and our Quarterly Report on Form 10-Q for the quarter ended September 30, 2013. 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.

About Caterpillar Oil & Gas

Caterpillar Oil & Gas, with headquarters in Houston, Texas, consolidates all the sales and service activities for Cat oil and gas power solutions that include reciprocating engines, generator sets, transmissions and well stimulation pumps. Since the 1930s, Caterpillar has manufactured engines for the oilfield and today provides power solutions with outputs from 31 to 16,000 kW. The sales and service network includes more than 2,100 dealer locations worldwide dedicated to support customers in the drilling, production, well service and gas compression segments. More information is available at: http://www.catoilandgasinfo.com.

About Caterpillar

For nearly 90 years, Caterpillar Inc. has been making sustainable progress possible and driving positive change on every continent. Customers turn to Caterpillar to help them develop infrastructure, energy and natural resource assets. With 2013 sales and revenues of $55.656 billion, Caterpillar is the world’s leading manufacturer of construction and mining equipment, diesel and natural gas engines, industrial gas turbines and diesel-electric locomotives. The company principally operates through its three product segments - Resource Industries, Construction Industries and Energy & Transportation - and also provides financing and related services through its Financial Products segment. For more information, visit caterpillar.com. To connect with us on social media, visit caterpillar.com/social-media.

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