Hampshire Compressor Station Maintenance (HampSEG), September 9 – November 25, 2026

SEV 4/5Maintenance0.340 Bcf/d78 days

Summary

CGT is scheduling maintenance at Hampshire Compressor Station (HampSEG) from September 9 through November 25, 2026 -- 78 calendar days. Backhaul capacity through HampSEG will be restricted to 2.200-2.350 Bcf/d against a design capacity of 2.541 Bcf/d, a reduction of approximately 0.190-0.340 Bcf/d (87-92% of design). CGT explicitly warns that Primary Firm, Secondary Firm, and Interruptible services are all at risk of curtailment, and Reservation Charge Credits have been triggered -- a firm-service curtailment notice, not merely an informational posting.

Trading note

CGT HampSEG maintenance removes up to 0.340 Bcf/d of backhaul capacity from September 9 through November 25, with explicit risk of Primary Firm curtailments; Columbia Gulf mainline basis has been trading near -0.285 to -0.288 vs Henry Hub as of September 1 -- expect that spread to widen further as northbound backhaul capacity is squeezed during the shoulder/early-winter period, with modest bullish support for Transco Zone 4 and Gulf Coast downstream markets receiving less northbound competition for Gulf Coast gas.

Reroute potential

Moderate: Texas Eastern (TETCO) and Trunkline (TGC) serve overlapping Gulf Coast northbound corridors and provide partial backhaul alternatives; however, the 78-day duration and explicit firm curtailment risk mean alternative paths may face significant competition for remaining capacity, limiting full offset.

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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: 09/02/26

09/02/26

10/02/26
Subject: Subject: Hampshire Compressor Station Maintenance (HampSEG), September 9 – November 25, 2026
Author: Author: Dillon Schoolcraft
Notice Text
Columbia Gulf Transmission LLC (CGT) notifies customers of upcoming maintenance at Hampshire Compressor Station scheduled for Wednesday, September 9, 2026, through Wednesday, November 25, 2026. As a result, the backhaul capacity through HampSEG will be reduced to a level between 2,200,000 and 2,350,000 Dth effective Timely Cycle for Gas Day Wednesday, September 9, 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.

 HampSEG

·       Estimated Capacity Setting: 2,200,000 - 2,350,000 Dth

·       Design Capacity: 2,540,656

·       Posted Percentage: 87-92%

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 August 20-26, 2026, pursuant to the provisions in the Tariff.

Please contact your Customer Services Representative with any questions.

ID: CGT-26210020 | Rev. 1 | Posted: 2026-09-02 17:17 | Direction: Bullish All Columbia Gulf Transmission (CGT) notices · page generated 2026-09-26 06:43 UTC