Owned by EQM Midstream Partners, LP (EQM), as of December 31, 2017, the gathering system included approximately 630 miles of high-pressure gathering lines with approximately 2.3 Bcf per day of total firm contracted gathering capacity, compression of approximately 305,000 horsepower, and multiple interconnect points with the transmission and storage system and five interstate pipelines. The gathering system also included approximately 1,500 miles of FERC-regulated low-pressure gathering lines.
EQM pursues gathering expansion projects for EQT and third-party producers and invested approximately $255 million on gathering projects in 2017 that added 475 MMcf per day of firm gathering capacity in southwestern Pennsylvania. This included the final phase of the header pipeline for Range Resources, which was placed in-service during the second quarter of 2017. The system now provides total firm gathering capacity of 600 MMcf per day. This system, other expansion projects, primarily for EQT, and the assets acquired in EQT’s acquisition of Rice Energy, Inc. supported increased gathered volumes of 34% and gathering revenues of 28% in 2017.
In 2018, EQM estimates capital expenditures of approximately $750 million on gathering expansion projects, primarily driven by wellhead and header projects in Pennsylvania and West Virginia. These expansion projects include the Hammerhead project, a 1.2 Bcf per day gathering header connecting Pennsylvania and West Virginia production to the Mountain Valley Pipeline.