UPDATE: Hampshire Compressor Station Maintenance

SEV 4/5Maintenance0.391 Bcf/d77 days

Summary

CGT has updated its Hampshire Compressor Station maintenance notice, revising the lower bound of the backhaul capacity restriction downward to 2,150,000 Dth/d (from the prior 2,200,000 Dth/d floor), against a design capacity of 2,540,656 Dth/d -- a reduction of up to 0.391 Bcf/d versus design. The maintenance window remains September 9 through November 25, 2026 (77 days). Critically, the prior posting explicitly warned of potential curtailments to Interruptible, Secondary Firm, and Primary Firm services, an escalation trigger that elevates severity; the updated notice widens the capacity reduction range modestly on the downside and removes the explicit firm-service curtailment language, but the prior notice established that risk and it has not been formally withdrawn. Live capacity data for HampSEG (TD4 cycle, timely) shows 2.15 Bcf/d scheduled against 2.54 Bcf/d operating capacity at 84.8% utilization today, consistent with pre-event conditions ahead of the September 9 effective date.

Trading note

CGT Hampshire maintenance removes up to 0.391 Bcf/d of backhaul capacity on HampSEG from September 9 through November 25, representing roughly 15% of the segment's design capacity; with Columbia Gulf mainline basis most recently at -0.215 vs Henry Hub (2026-09-03) against a 5-day trailing average of -0.254, expect this basis to tighten (move less negative or flip positive) as northbound backhaul tightens through Kentucky and into TETCO/Adair Co. interconnects, which is already showing only 3.6% headroom at 0.200 Bcf/d scheduled.

Reroute potential

Moderate: Texas Eastern (TETCO) and Trunkline (TGC) serve overlapping Gulf Coast northbound corridors and provide partial reroute options, but the multi-month duration and the prior notice's warning of firm service curtailments suggest the constraint exceeds what parallel capacity can fully absorb without basis widening.

Get alerts like this, free

Enercast Pipe Monitor tracks critical notices on 190+ U.S. interstate pipelines and scores each one for severity, capacity impact and basis direction. Free subscribers get Severity 4–5 notices by email or Telegram; Pro subscribers get every notice in real time.

Get free alerts See Pro real-time → Today’s critical notices

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: Supersede

Prior Notice: 26210020

Critical: Y

Reqrd Rsp Desc: No Response Required
Post

Notice Effective

Notice End



Response
Post Date: 09/04/26

09/04/26

10/04/26
Subject: Subject: UPDATE: Hampshire Compressor Station Maintenance
Author: Author: Tyler King
Notice Text
Columbia Gulf Transmission, LLC (CGT) notifies customers that based on updated logistics involving the upcoming maintenance at Hampshire Compressor Station, the backhaul capacity will be reduced to a level between 2,150,000 Dth and 2,350,000 Dth effective Timely Cycle for Gas Day Wednesday, September 9, 2026. 

CGT encourages customers to monitor the Daily Capacity Posting each day of the maintenance for the specific capacity setting through HampSEG. 

HampSEG

·       Estimated Capacity Setting: 2,150,000 - 2,350,000 Dth

·       Design Capacity: 2,540,656

·       Posted Percentage: 85-92%





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). 

Please contact your Customer Services Representative with any questions.

  

***Previous Posting***





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-26239018 | Rev. 1 | Posted: 2026-09-04 17:47 | Direction: Bullish All Columbia Gulf Transmission (CGT) notices · page generated 2026-09-26 06:44 UTC