Owned by EQM Midstream Partners, LP (EQM), as of December 31, 2017, the transmission and storage system included an approximately 950-mile FERC-regulated interstate pipeline that connects to seven interstate pipelines and local distribution companies. The transmission and storage system is supported by 18 associated natural gas storage reservoirs with approximately 645 MMcf per day of peak withdrawal capacity, 43 Bcf of working gas capacity, and 41 compressor units, with total throughput capacity of approximately 4.4 Bcf per day and compression of approximately 120,000 horsepower at year-end 2017. Transmission also includes EQM’s investment in the Mountain Valley Pipeline (MVP).
EQM pursues transmission projects aimed at profitably increasing system capacity and invested approximately $111 million on transmission and storage system infrastructure in 2017. Revenues in 2017 increased by approximately $41 million or 12% compared to 2016. The following transmission projects are currently in progress:
Mountain Valley Pipeline
Mountain Valley Pipeline, LLC (MVP Joint Venture) is a joint venture with affiliates of each of NextEra Energy, Inc., Consolidated Edison, Inc., WGL Holdings, Inc. and RGC Resources, Inc. EQM is the operator of the MVP and owned a 45.5% interest in the MVP Joint Venture as of December 31, 2017. The 42-inch diameter pipeline has a targeted capacity of 2.0 Bcf per day and is estimated to span 300 miles extending from Transmission’s existing transmission and storage system in Wetzel County, West Virginia to Pittsylvania County, Virginia providing access to the growing Southeast demand markets. As currently designed, the MVP is estimated to cost a total of $4.6 billion, excluding AFUDC, with EQM funding approximately $2.2 billion of the project cost. The MVP Joint Venture has secured a total of 2.0 Bcf per day of firm capacity commitments at 20-year terms. MVP is expected to be placed in-service during the fourth quarter 2019.
In April 2018, the MVP Joint Venture announced a proposed 70-mile interstate pipeline that will extend from the MVP at Pittsylvania County, Virginia to new delivery points in Rockingham and Alamance Counties, North Carolina. The MVP Southgate project is anchored by a firm capacity commitment from PSNC Energy. The preliminary project cost estimate is $350 million to $500 million, which is expected to be spent in 2019 and 2020. EQM has a 32.7% ownership interest in the project and will operate the pipeline. Subject to approval by the FERC, the MVP Southgate project has a targeted in-service date of the fourth quarter 2020.
In 2018, EQM estimates capital expenditures of approximately $100 million for other transmission expansion projects, primarily attributable to the Equitrans, L.P. Expansion project that is designed to provide north-to-south capacity on the mainline Equitrans, L.P. system for deliveries to the MVP.