Mark West Energy

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MarkWest Energy Partners, L.P. (NYSE: MWE) builds and maintains gas gathering systems and plants. Their Marcellus shale assets include refrigeration processing facilities, compressor stations, and miles of high pressure gathering lines. These are dedicated to Range Resources' Marcellus production.

MarkWest is the leading gas processing company in the Appalachian Basin.

According to an October, 2008 report, MarkWest has invested $200 million in this infrastructure project and has already completed a refrigeration plant near Houston in Chartiers Township, Washington County in southwestern Pennsylvania. It will have the capacity of processing 30 million cubic feet (Mmcf) of natural gas per day. It also includes three compressor stations and roughly 25 miles of pipelines. Other plans include:

• A cryogenic processing plant with a capcity of 30 Mmcf per day. It include three compressor stations as well as 20 miles of pipeline gathering system. It will be built next to the refrigeration plant in Chartiers Township. It will produce propane from gas for local southwestern-Pennsylvania consumption using a depropanizer. According to an April, 2009 update from the company, the plant is complete. Combined with the capacity of the above mentioned refrigeration plant, it gives Range throughput of 60 Mmcf per day. Range has 15 wells in the area which in April were still awaiting hookup to these plants.

• Another cryogenic plant to extract gas liquids. Its capacity will be 120 MMcf per day and will be done in late 2009.

MarkWest is building two additional plants for Range located on State Route 519, three miles north of Houston, Pennsylvania.

In January, 2009 it was reported that NGP Midstream & Resources LP was investing $200 million of start-up capital in a joint venture with MarkWest for processing Marcellus shale gas. The latter will also invest $100 million of Marcellus assets in the venture.

Frank Semple is the President and CEO of MarkWest.

Randy Nickerson is Chief Commercial Officer.