MarkWest In Long-Term, Fee-Based Deal With XTO On NGLs

MarkWest Energy Partners, L.P. has signed a long-term, fee-based agreement with XTO Energy, Inc. a subsidiary of ExxonMobil Corp., to extend MarkWest’s natural gas liquids (NGL) gathering pipeline in northwest Pennsylvania to XTO’s processing plant in Butler County, PA which is expected to start operations in late 2012.