 EQM Midstream Partners LP delayed the expected completion of its Mountain Valley natural gas pipeline from West Virginia to Virginia to early 2021 and said it could boost the 5.4 billion projects cost by 5 to around 5.7 billion. Industry analysts, however, said Mountain Valley and other U.S. pipelines will likely be delayed even further by a Montana courts decision that the U.S. Army Corps of Engineers did not comply with the Endangered Species Act. EQM, which changed the projected in-service date in a statement issued late Thursday, had previously said it expected Mountain Valley to enter service in late 2020. 