Mountaineer XPress Pipeline

Columbia Gas Transmission's Marcellus and Utica takeaway line through West Virginia. A leak on Line 100 at the Saunders Creek Regulator Station on September 24, 2026 led to a force majeure and zero capacity on the affected segment, about 1.8 million Dth/d of firm service; the force majeure was lifted on September 27 with no failed component disclosed.

Record verified 1 Oct 2026 against census 2026-10: TC Energy / Columbia Gas Transmission. Tracked since 2026-09.