PipeProwler Notable Event
Planned pigging on Columbia Gulf's reversed Mainline 200
Up to ~495 MDth/d of southbound Appalachian takeaway off for 8 days; EGS basis softens, HH effect marginal.
Planned pigging on Columbia Gulf's reversed Mainline 200 cuts up to ~495 MDth/d of southbound Appalachian takeaway, May 30 through June 6. Eastern Gas South basis softens as supply backs up behind the constraint at Leach; Gulf and Henry Hub effects are marginal.
Event details
- Pipeline / operator: Columbia Gulf Transmission (TC Energy)
- Event type: Planned maintenance (pigging), takeaway constraint
- Severity grade: Sev 4
- Affected capacity: 295–495 MDth/d reduction (13–21% of 2,344,656 Dth/d design; reduced setting 1,850–2,050 MDth/d)
- Duration: 8 days; effective May 30 through June 6, 2026
- Corridor / hub linkage: Columbia Gulf Mainline 200 StanSEG (reversed, "Net Backhaul"): Appalachian receipts at Leach KY → Stanton CS → southbound Gulf / LNG feedgas
- Operator notice: Columbia Gulf Notice #26022011, posted May 22, 2026 at 15:38 ET (19:38 UTC)
- First detected: 2026-05-22 15:38 ET
Tags: columbia-gulf-mainline-200 · eastern-gas-south · planned-maintenance · takeaway-constraint · appalachian-basis
Directional reads describe expected supply/demand implications. Not realized prices. Not trading advice.