Crestwood Midstream Buys Compression Assets for Antero Resources

Crestwood MidstreamPartners LP (NYSE: CMLP) announced today anagreement by CMM to acquire natural gas compression and dehydrationassets from Enerven Compression, LLC ("Enerven") for approximately$95 million. The assets, located on CMM's gathering systems inHarrison and Doddridge Counties, West Virginia, serve the MarcellusShale development of Antero Resources Appalachian Corp. ("Antero").The assets are currently operating under a five year compressionservices agreement with Antero and are expected to contributeapproximately $11-12 million of contracted earnings before interest,taxes, depreciation and amortization ("EBITDA") to CMM in 2013. Theacquisition is expected to close before December 31, 2012 and will befinanced through CMM's existing $200 million credit facility. Enerven Compression Assets The Enerven assets, constructed in 2010-2012, include fourcompression and dehydration stations comprised of 31 two and threestage, reciprocating natural gas compressor units and 10 glycoldehydration units. The compressor stations receive Antero's gasproduction from CMM's low pressure gathering facilities forredelivery to downstream high-pressure pipelines and processingplants. CMM is acquiring 43,100 horsepower of compression designed toprovide aggregate capacity of 295 million cubic feet per day("MMcf/d") to Antero. Currently, all of the Enerven compressorstations are being fully utilized with ongoing projects to expand twoof the four stations by approximately 25 MMcf/d. Antero's gas is alsobeing compressed by third party compression not currently owned byEnerven or CMM. Update on Antero and Crestwood Marcellus Activity As discussed in Crestwood's third quarter 2012 earnings call, Anterocontinues to increase its Marcellus Shale development activity andnatural gas production volumes on CMM's gathering systems. Antero iscurrently running 6 rigs on the 127,000 acre area of dedication(Eastern AOD) under CMM's 20-year gathering and compressionagreement, and up to 12 rigs in the area including the Antero leased acreage adjacent and to the west of the Eastern AOD where CMM holds aseven-year right of first offer to acquire midstream assets owned byAntero. Production volumes on the Eastern AOD have increased steadilythroughout 2012 from approximately 200 MMcf/d at the beginning of2012 to an average of 257 MMcf/d in the second quarter 2012, anaverage of 289 MMcf/d in the third quarter 2012 and a spot volume ofapproximately 376 MMcf/d on November 1, 2012. CMM currently has twomajor pipeline and two major compressor station projects with acombined capacity of 100 MMcf/d underway to support Antero's 2013development program which is expected to add over 60 Marcellus Shalewells to the 100 producing wells currently connected to the CMMgathering systems.