EGTS Restrictions Top First Marcellus/Utica Pipeline Outage Watch

Eastern Gas Transmission & Storage has cut receipt capacity both south and north of its Valley Gate area since Nov. 7, making it the single biggest squeeze on Marcellus/Utica gas flows this week. The restrictions stack onto reduced operations at Mountain Valley Pipeline, a lingering cap at a Stonewall Gas Gathering interconnect, and trim notices on Texas Eastern and Transco.

This is the first edition of MDN's Pipeline Outage Watch, a weekly roundup of pipeline problems that can bottle up Marcellus/Utica gas (the Appalachian shale producing region spanning Pennsylvania, West Virginia and Ohio).

What is EGTS restricting, and why?

EGTS — formerly Dominion Transmission — imposed the constraints in two steps. Since Nov. 7 it has limited how much gas it will accept at points south of its Valley Gate area. Since Nov. 10 the same limits apply at points north of it.

The operator cited two causes: operating conditions and caps on how much gas it can push into storage. That second point matters. Storage injection limits (the physical ceiling on how much gas a system can force into depleted reservoirs for winter withdrawal) suggest the constraint is seasonal rather than a mechanical failure. The company has not said when the restrictions will lift. That silence is the story — producers and shippers are left guessing on duration.

Takeaway: The region's biggest storage system is telling the market it is full, or close to it, and flows are paying the price.

How much capacity is actually off the table?

The numbers vary by pipeline, but each one is firm:

• EGTS: Receipt limits south of Valley Gate effective Nov. 7; north of Valley Gate effective Nov. 10. No numeric cap disclosed.
• Columbia Gas Transmission: The receipt cap at DT Midstream's Stonewall Gas Gathering interconnect in Braxton County, W.Va., keeps creeping back up — to 1,007,000 Dth/d (dekatherms per day, roughly equivalent to a million cubic feet of gas) as of Nov. 10. Recovery, but not full restoration.
• Mountain Valley Pipeline: Ran the entire week of Nov. 9–13 at reduced capacity — 1,760,000 Dth/d — for maintenance at its Harris Compressor Station.
• Texas Eastern (TETCO): Trimming southbound firm transportation service at Danville, Ky., by roughly 9–14%.
• Transco: A one-day hiccup on its southbound mainline, since resolved.

Rover, NEXUS and Millennium ran quiet all week.

Takeaway: MVP's week-long derate is the largest single numeric cut, but EGTS's undisclosed cap may be the bigger market factor.

What should shippers watch next?

Three things move this story forward. First, whether EGTS lifts its receipt limits once storage injection season winds down — the operator gave no date. Second, whether Columbia's Stonewall cap continues its crawl back toward unrestricted levels; 1,007,000 Dth/d on Nov. 10 is progress, but the trajectory matters more than the snapshot. Third, whether MVP's Harris Compressor Station maintenance wraps on schedule and restores the line above 1,760,000 Dth/d.

The quiet systems deserve a note too. Rover, NEXUS and Millennium reported no constraints. In a week like this, that is capacity producers can actually use.

Takeaway: Watch EGTS for a storage-driven relief date and MVP for a maintenance completion notice — those two notices will reset Appalachian flow economics more than anything else on the board.