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Company Description

Contact Info

Tower 1

Suite 1600

1515 Arapahoe Street

Denver, CO 80202

United States

Phone: 303-925-9200

Fax: 303-290-8769

MarkWest Energy Partners, L.P. engages in gathering, processing and transporting natural gas; gathering, transportation, fractionation, storage and marketing of natural gas liquids (NGLs); the gathering and transportation of crude oil. Segments The company conducts its operations in the following segments: Southwest, Northeast, Liberty, and Utica. SOUTHWEST East Texas: The company owns a system that consists of natural gas gathering pipelines, centralized compressor stations, a natural gas processing complex and an NGL pipeline. The East Texas system is located in Panola, Harrison and Rusk counties and services the Carthage Field. For natural gas that is processed in this area, the company purchases NGLs from the producers under percent-of-proceeds arrangements, or the company transports and processes volumes for a fee. The company sells substantially all of the purchased and retained NGLs produced at its East Texas processing facility to Targa Resources Partners, L.P. (Targa) under a long-term contract. Oklahoma: The company owns an extensive natural gas gathering system in the Woodford Shale play in the Arkoma Basin of southeast Oklahoma. The company owns a 40% non-operating membership interest in Centrahoma Processing L.L.C. (Centrahoma), a joint venture with Atlas Pipeline Partners, L.P. (Atlas). The natural gas gathered in the Woodford system is processed through Centrahoma or other third-party processors. The company sells substantially all of the NGLs produced in the Western Oklahoma processing complex to ONEOK Hydrocarbon L.P. (ONEOK) under a long-term contract. Through its joint venture, MarkWest Pioneer L.L.C. (MarkWest Pioneer), the company operates the Arkoma Connector Pipeline, a 50-mile Federal Energy Regulatory Commission (FERC)-regulated pipeline that interconnects with the Midcontinent Express Pipeline and Gulf Crossing Pipeline at Bennington, Oklahoma and is designed to provide approximately 638,000 dekatherms per day (Dth/d) of Woodford Shale takeaway capacity. The company completed an additional interconnect with the Natural Gas Pipeline of America L.L.C (NGPL Pipeline) in Bennington, Oklahoma in April 2012. Javelina: The company owns and operates the Javelina processing and fractionation facility in Corpus Christi, Texas that treats, processes and fractionates off-gas from six local refineries operated by three different refinery customers. Other Southwest: The company owns natural gas gathering systems and lateral pipelines located in Texas, Louisiana and New Mexico, including the Appleby gathering system in Nacogdoches county, Texas. The company gathers a significant portion of the natural gas produced from fields adjacent to its gathering systems, including from wells targeting the Haynesville Shale. In many areas the company is the primary gatherer, and in some of the areas served by its smaller systems the company is the sole gatherer. The company’s Hobbs, New Mexico natural gas lateral pipeline is subject to regulation by FERC. NORTHEAST Kentucky and southern West Virginia: The Northeast segment assets include the Kenova, Boldman, Cobb, Kermit and the Langley natural gas processing complexes, an NGL pipeline, and the Siloam NGL fractionation facility. During 2012, the company completed an additional cryogenic natural gas processing plant at the Langley processing complex with a capacity of 150 MMcf/d (One thousand cubic feet of natural gas per day). In addition, the company has two caverns for storing propane at its Siloam facility and additional propane storage capacity under a long-term firm-capacity agreement with a third-party. Including its presence in the Marcellus Shale, the company is a processor and fractionator of natural gas in the Northeast, with fully integrated processing, fractionation, storage and marketing operations. Michigan: The company owns and operates a FERC-regulated crude oil pipeline in Michigan (Michigan Crude Pipeline) providing interstate transportation service. LIBERTY Marcellus Shale: The company provides natural gas midstream services in southwest Pennsylvania and northern West Virginia through MarkWest Liberty Midstream. Wit

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