Mainline-200 Pipeline Maintenance (BannSEG), August 27 – September 6, 2026

SEV 4/5Maintenance0.190 Bcf/d11 days

Summary

Columbia Gulf Transmission is reducing backhaul capacity on Mainline-200 at BannSEG from August 27 through September 6, 2026 (11 days) for pipeline maintenance. The restriction sets operating capacity at 2.300-2.350 Bcf/d against a design capacity of 2.540 Bcf/d, representing a reduction of approximately 0.190-0.240 Bcf/d (91-93% of design). CGT explicitly warns that Interruptible, Secondary Firm, and Primary Firm services are all at risk of curtailment -- a significant escalation beyond typical non-firm notices.

Trading note

CGT Mainline-200 BannSEG maintenance removes approximately 0.190-0.240 Bcf/d of northbound backhaul capacity beginning August 27; with Primary Firm at risk and BannSEG currently running at 87.7-94.3% utilization in recent cycles (2.23-2.39 Bcf/d scheduled vs. 2.54 Bcf/d operating capacity), expect bullish pressure on Columbia Gulf mainline basis -- most recently trading at -0.420 vs. Henry Hub as of 2026-08-19 -- with tightening likely as the constraint date approaches and firm curtailment risk narrows scheduling flexibility at Transco Zone 4 and TETCO M3 downstream interconnects.

Reroute potential

Moderate: Texas Eastern (TETCO) and Trunkline (TGC) serve overlapping Gulf Coast northbound corridors and may absorb some displaced volumes, though both systems carry their own utilization loads and cannot be assumed to have spare capacity without live confirmation. The firm curtailment risk elevates the difficulty of full reroute.

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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: Mainline-200 Pipeline Maintenance (BannSEG), August 27 – September 6, 2026
Author: Author: Dillon Schoolcraft
Notice Text
Columbia Gulf Transmission LLC (CGT) notifies customers of upcoming pipeline maintenance on Mainline-200 beginning on Thursday, August 27, 2026, through Sunday, September 6, 2026. As a result, the backhaul capacity through BannSEG will be reduced to a level between 2,300,000 – 2,350,000 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.

BannSEG

·        Estimated Capacity Setting: 2,300,000 – 2,350,000 Dth 

·        Design Capacity: 2,540,256 Dth

·        Posted Percentage: 91-93%

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-26151013 | Rev. 1 | Posted: 2026-08-20 19:07 | Direction: Bullish All Columbia Gulf Transmission (CGT) notices · page generated 2026-09-26 06:43 UTC