MarkWest Energy acquires Keystone Midstream Services

Yesterday, MarkWest Energy Partners, L.P. announced that it was purchasing Keystone Midstream Services, LLC for $512 million, Business Wire reports. Keystone's assets, located in Butler County, Pennsylvania, include "two cryogenic gas processing plants totaling 90 million cubic feet per day (MMcfd) of capacity, a gas gathering system and associated field compression," the article said. For more, read the full story here.