Means Valve Replacement (StanSEG), August 27 – September 3, 2026

SEV 4/5Maintenance0.395 Bcf/d8 days

Summary

CGT is performing a valve replacement at Means, Kentucky from August 27 through September 3, 2026 (8 days), reducing backhaul capacity on StanSEG to between 1.95 and 2.20 Bcf/d against a design capacity of 2.345 Bcf/d -- a reduction of approximately 0.14 to 0.40 Bcf/d. CGT explicitly warns of potential curtailments to Interruptible, Secondary Firm, and Primary Firm services, meeting the escalation threshold for a severity 4 rating on a planned event. The current live reading shows StanSEG already running at 90.2% utilization (2.12 Bcf/d scheduled of 2.34 Bcf/d operating capacity) on today's timely cycle, meaning the capacity ceiling will drop below current scheduled volumes once the restriction takes effect.

Trading note

CGT valve maintenance at Means, KY cuts StanSEG backhaul to 1.95-2.20 Bcf/d (down from 2.34 Bcf/d design, a maximum reduction of ~0.395 Bcf/d) and explicitly risks Primary Firm curtailments; Columbia Gulf mainline basis, which has averaged -0.406 vs HH over the five trading days ended 2026-08-19 (most recently -0.420 on 2026-08-19), should widen further bearish as northbound backhaul is constrained and Gulf Coast gas backs up, with bullish pressure at downstream Appalachian and Mid-Atlantic delivery points served by CGT northward flows.

Reroute potential

Moderate: Texas Eastern (TETCO) and Trunkline (TGC) serve overlapping Gulf Coast northbound corridors and can absorb some diverted volumes, but the live capacity data shows HartSEG and CorinSEG already running at near-zero headroom (2.5% and 0.0% respectively), suggesting the broader CGT mainline system is already tight and reroute capacity may be limited in practice.

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View original notice text (as posted by Columbia Gulf Transmission (CGT))

TSP Name Columbia Gulf Transmission, LLC
TSP 007854581
Notice Type Description: Maintenance

Notice Stat Desc: Initiate

Prior Notice: 

Critical: Y

Reqrd Rsp Desc: No Response Required
Post

Notice Effective

Notice End



Response
Post Date: 08/20/26

08/20/26

09/20/26
Subject: Subject: Means Valve Replacement (StanSEG), August 27 – September 3, 2026
Author: Author: Dillon Schoolcraft
Notice Text
Columbia Gulf Transmission LLC (CGT) notifies customers of upcoming valve replacement in Means, Kentucky beginning on Thursday, August 27, 2026, through Thursday, September 3, 2026. As a result, the backhaul capacity through StanSEG will be reduced to a level between 1,950,000 and 2,200,000 Dth effective Timely Cycle for Gas Day Thursday, August 27, 2026.

CGT anticipates this restriction may result in curtailments to Interruptible, Secondary Firm, and Primary Firm services. Please see the details provided below for more information.

StanSEG

·        Estimated Capacity Setting: 1,950,000 – 2,200,000 Dth

·        Design Capacity: 2,344,656 Dth

·        Posted Percentage: 83-94%

Due to the potential impact to firm service, CGT encourages customers to monitor the scheduled volumes on the Operationally Available Capacity screen on Informational Postings, as nominations can fluctuate based on market conditions. 

Reservation Charge Credits (RCCs) will be determined per the process set forth in the General Terms and Conditions, Section 40 of CGT’s FERC Gas Tariff (Tariff). By means of this notice, CGT is establishing the 7-day Average Usage Quantity to be the period of June 13-19, 2026, pursuant to the provisions in the Tariff. 

Please contact your Customer Services Representative with any questions.

ID: CGT-26151012 | Rev. 1 | Posted: 2026-08-20 19:07 | Direction: Bullish All Columbia Gulf Transmission (CGT) notices · page generated 2026-09-26 06:43 UTC