Frontier Midstream

Frontier Midstream (“Frontier II”) was formed in March 2008 with a strategy of acquiring and/or building greenfield midstream development projects, initially located in the Fayetteville Shale, Marcellus Shale, Permian Basin and the Mid-Continent area. Frontier II was led by the previous President and CEO and several other management team members of Frontier Field Services (a Fund II/III portfolio company). Frontier II acquired and/or constructed four natural gas gathering systems in the Fayetteville Shale in Arkansas and a natural gas plant and gathering system in the Granite Wash play of the Texas Panhandle. In April 2011, Frontier II sold all of its assets to Crestwood Midstream Partners, a subsidiary of Crestwood Equity Partners (NYSE: CEQP).

Frontier II was the second partnership between management and Energy Spectrum.