Columbia Gulf Transmission (CGT) (Gulf Coast, Appalachia): 52 active notices, 5 rated severity 4–5; 3 posted in the last 7 days. 1 outage in effect today: 0.391 Bcf/d offline at Hampshire Compressor Station Hampseg, expected back Nov 25. Capacity Offline →
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Maintenance0.100 Bcf/d cut (capped at 0.700 Bcf/d)2 Days
CGT is conducting planned maintenance at Lake Arthur Compressor Station on October 27-28, 2026, which will reduce delivery capacity at Cameron LNG (loc 4246) from its design capacity of 0.800 Bcf/d to 0.700 Bcf/d (Primary Only), a reduction of 0.100 Bcf/d. CGT explicitly warns that this restriction may result in curtailments to Interruptible, Secondary Firm, and Primary Firm services. Live capacity data for Cameron LNG (loc 4246) shows the point currently running at 0.696 Bcf/d scheduled against 0.800 Bcf/d operating capacity, confirming the new 0.700 Bcf/d cap is effectively at or just above current flows but Primary Firm curtailment risk makes this actionable.
CGT maintenance cuts Cameron LNG feed gas delivery cap by 0.100 Bcf/d (0.800 to 0.700 Bcf/d) on Oct 27-28 with explicit Primary Firm curtailment risk; gas that cannot be exported stays domestic, bearish for Henry Hub and Gulf Coast basis over the two-day window.
Reroute: Limited: Cameron LNG feed gas can only arrive via pipelines serving that terminal; no alternative LNG export outlet exists for these specific curtailed volumes, so the gas remains in the domestic market.
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the explicit firm-service curtailment language, but the prior notice established that risk and it has not been formally withdrawn.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.
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: 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.
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Columbia Gulf Transmission (CGT)
COMPLETED: Means Valve Replacement (StanSEG), Effective ID2 for September 4, 2026
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.
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: 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.
Below alert threshold -- no detailed analysis performed.
Reroute: Not assessed.
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Columbia Gulf Transmission (CGT)
CAPACITY POSTING - TIM for August 15-17, 2026
SEV 4/5
Force Majeure2.350 Bcf/dUntil Further Notice
Columbia Gulf Transmission declares a capacity constraint notice for August 15-17, 2026, with an active force majeure at Corinth Compressor Station Unit 505 that has been in effect since June 19, 2026. The CorinSEG is restricted to 2,350,000 Dth/d (2.350 Bcf/d) in the net backhaul direction, while all other segments are listed at total capacity. No OFO has been declared, but Due Shipper service is unavailable. Several point constraints show zero availability (CROSSTEX-GIBSON, TRANSCO/TERREBONNE, SEA ROBIN-ERATH, BURLINGTON-TERREBONNE, SOUTHEASTERN SUPPLY HEADER, Texas Gas Isola), indicating meaningful localized tightness alongside the mainline FM.
Active CGT force majeure at Corinth CS Unit 505 restricts CorinSEG backhaul to 2.350 Bcf/d with no restoration date; CGT mainline basis has recently traded at -0.300 vs Henry Hub (2026-08-12), and continued FM with no timeline raises risk of widening at Columbia Gulf mainline and supportive pressure at Henry Hub as northbound backhaul throughput remains constrained -- watch Transco Zone 4 for downstream tightening.
Reroute: Moderate: Texas Eastern (TETCO) and Trunkline (TGC) serve overlapping Gulf Coast northbound corridors and provide partial reroute options, but the CGT FM has been active since June 19 with no restoration timeline, limiting the market's ability to fully offset the constraint through alternatives.
CGT declares a Critical capacity constraint notice for August 14, 2026 reflecting an active force majeure at Corinth Compressor Station Unit 505 originally declared June 19, 2026, with no restoration date provided. CorinSEG is capped at 2.350 Bcf/d on the backhaul (net backhaul), and InvrnSEG is capped at 2.325 Bcf/d. A single point change from the prior posting restricts MidWestern Pipeline deliveries (Loc 4197) to 50,000 Dth/d effective ID1 for 8/13/2026. Due Shipper service is not available, indicating system tightness; no OFO has been declared.
Active CGT force majeure limits CorinSEG backhaul to 2.350 Bcf/d and InvrnSEG to 2.325 Bcf/d on an unresolved 'until further notice' basis since June 19; Columbia Gulf mainline basis was -0.300 as of 2026-08-12 (5-day average -0.278 vs Henry Hub), and continued force majeure with no restoration timeline supports widening of Southeast delivery basis at Transco Zone 4 and TETCO M3 versus CGT mainline as northbound backhaul capacity remains constrained.
Reroute: Moderate: Texas Eastern (TETCO) and Trunkline (TGC) serve overlapping Gulf Coast northbound corridors and can absorb some volumes, but both are fully subscribed segments of a tight Gulf Coast system; the multi-month duration of this force majeure means alternative paths are likely already being utilized, limiting incremental reroute relief.
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Columbia Gulf Transmission (CGT)
REVISED: CAPACITY POSTING - TIM for August 11, 2026
