MarkWest: 7 New NE Plants Online in Past 4 Mos, 17 More Coming! Economic Impact | Energy Services | Industrywide Issues | MarkWest Energy | Ohio | Pennsylvania | Pipelines | Processing Plants | Statewide OH | Statewide PA | Statewide WV | West Virginia January 31, 2014January 31, 2014 Username Password Remember me Forgot Password? Join Us Related