Transco (Williams) (Southeast, Mid-Atlantic, Northeast): 1,130 active notices, 9 rated severity 4–5; 9 posted in the last 7 days. 1 outage in effect today (no volume stated) at 36" MAINLINE C MAINC Reduced Port Valve Replacement Project…, expected back Oct 31. Capacity Offline →
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Reroute: Not assessed.
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Transco
Update - Notice of Force Majeure Event - Unplanned Outage Station 50 Main Unit 9
SEV 2/5
Restoration1 Days
Transco is reporting that repairs to Main Unit 9 at Compressor Station 50 (MP 517.23, South-to-North, loc ID 9013363) have been completed and the unit has been returned to service. The associated TSB limitation is lifted effective the ID1 cycle for Gas Day October 3, 2026. This notice supersedes prior notice 17324005 and ends the force majeure event.
Station 50 Unit 9 restoration removes the TSB limitation effective ID1 October 3; live capacity data shows CS 50 MP 517.25 at 59.6% utilization with 0.856 Bcf/d headroom, corroborating full return to service -- no residual basis impact expected at Transco Zone 4 or Henry Hub.
Reroute: High: the constraint has been resolved and no reroute is needed; during the outage, Transco's south-to-north mainline south of Station 50 had moderate reroute via alternative southern zone capacity.
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Transco
Update - Notice of Force Majeure Event - Unplanned Outage - Guillory M3681 Meter Station 2026
SEV 1/5
Restoration
Transco has declared the force majeure at the Guillory M3681 Meter Station (Location ID 9013263, MP 473.5) resolved. Repairs to facility piping are complete and the station will be returned to service and available for scheduling effective gas day 10/3/2026. Live capacity data shows the receipt meter at zero operating capacity on the 10/2 evening cycle (vs-design flag), consistent with it being offline prior to restoration.
Force majeure at Guillory M3681 is fully resolved effective 10/3/2026 gas day; no ongoing capacity restriction at this receipt point and no actionable basis signal.
Reroute: Moot -- the constraint is resolved and supply is being restored to full service.
Transco declared a Force Majeure event on 9/28/2026 due to integrity concerns on piping at the Guillory M3681 Meter Station (loc 9013263, Receipt, MP 473.5). The location was immediately restricted to zero scheduled capacity effective ID3 gas day 9/28/2026, with anticipated return to service October 3, 2026 -- a five-day outage. This is a revision superseding prior notice 17328542, with the key new information being the October 3 anticipated return-to-service date.
Transco FM at Guillory M3681 receipt meter eliminates scheduling capacity at this Gulf Coast receipt point through October 2; live capacity data confirms 0 Bcf/d operating and scheduled at loc 9013263 (evening cycle 9/30), corroborating the outage, with bullish implications for Transco Zone 4 basis as Gulf Coast receipt supply is curtailed; no volume stated in the notice so system-wide impact depends on typical throughput at this meter.
Reroute: Limited to moderate: Transco is the dominant Southeast-to-Northeast pipeline and producers with access to alternative interconnects (Gulf South, CGT, TETCO) may be able to reroute volumes, but the specific meter restriction at Guillory M3681 eliminates that receipt point entirely for its contracted shippers.
Transco declared force majeure on 9/28/2026 due to a Variable Frequency Drive failure on Main Unit 9 at Compressor Station 50 (MP 517.23), restricting south-to-north mainline flows effective timely gas day 9/29/2026. The TSB at MP 517 shows design capacity of 1.536 Bcf/d with total available quantity of 1.300 Bcf/d, representing a 0.236 Bcf/d reduction (approximately 15% of design capacity) with 5-12% cuts to primary firm service. Repairs are underway and expected to be completed by end of week, but no firm restoration date is given and duration remains UFN.
Transco Station 50 force majeure removes approximately 0.236 Bcf/d of south-to-north mainline capacity with 5-12% primary firm cuts, supportive of Transco Zone 4 and downstream zone basis widening vs Henry Hub; monitor CS 60 (already at 100% utilization per live data) and CS 65 South (81.5% loaded) as downstream choke points that could amplify impact if repairs extend beyond week-end.
Reroute: Limited: Transco is the dominant pipeline in the Southeast-to-Northeast corridor; Southern Natural Gas provides partial real-world alternative capacity in the Southeast but is unmonitored and cannot be confirmed available. Tennessee Gas Pipeline serves overlapping Northeast markets but cannot fully offset a Transco mainline constraint at this scale.
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Transco
Update - Notice of Force Majeure Event - Unplanned Outage – Guillory M3681 Meter Station 2026
SEV 4/5
Force MajeureUntil Further Notice
Transco declared a force majeure on 9/28/2026 due to integrity concerns on piping at the Guillory M3681 Meter Station (loc 9013263, receipt point, MP 473.5), effective ID3 gas day 9/28. Total available capacity at this receipt point has been zeroed out (EPSQ/0), and the location is unavailable for scheduling or flow until further notice. Repair work is underway with no restoration timeline posted; an updated timeline will follow when available.
Transco receipt FM at Guillory M3681 removes this Gulf Coast receipt point from scheduling UFN with zero available capacity confirmed in live data (loc 9013263 showing 0 Bcf/d operating capacity, 0.015 Bcf/d still scheduled vs-design flag); with Zone 4, Zone 5, and Zone 6 segment headroom already at 0% in today's intraday cycle, any reduction in Gulf Coast receipts adds incremental bullish pressure to Transco Zone 4 and downstream Southeast basis.
Reroute: Moderate: Transco serves Gulf Coast-to-Southeast flows alongside Southern Natural Gas (SNG, unmonitored) and Tennessee Gas Pipeline; shippers at this specific receipt meter have no bypass at this location, but alternative receipt points on Transco and competing pipes may partially offset lost supply. However, with Zone 4 and Zone 5 segment headroom already at 0% today, absorbing rerouted volumes on Transco itself is constrained.
Transco has declared a force majeure event at the Guillory M3681 Receipt Meter Station (Location ID 9013263, MP 473.5) effective ID3 gas day 9/28/2026 through at least the Evening cycle of 9/29/2026 due to equipment failure. The station is unavailable for scheduling or flow until further notice, with no restoration date provided. Live capacity data from intraday 2 on 9/28 showed 0.321 Bcf/d scheduled at this receipt point against 1.03 Bcf/d operating capacity, so the curtailed volume is approximately 0.321 Bcf/d; however, that reading predates the event and current scheduled quantities are now effectively zero per the notice.
Transco force majeure at Guillory M3681 (MP 473.5, Zone 4 corridor) removes approximately 0.321 Bcf/d of receipt capacity until further notice -- expect mild bullish pressure at Transco Zone 4 basis, with limited broader HH signal given the localized receipt-point nature of the outage; mainline segments remain largely unconstrained at this time but the UFN duration warrants monitoring.
Reroute: Limited: as a receipt meter station on Transco, the reroute option is for upstream shippers to redirect gas to alternative Transco receipt points or competing pipelines (Gulf South, CGT) serving this Louisiana corridor, but those arrangements require operational changes and may not fully replace scheduled quantities on short notice.
Transco has declared a force majeure event due to an unplanned equipment failure on Main Unit 9 at Compressor Station 50 (MP 517.23), effective timely gas day 9/29/2026 with no end date provided. The outage restricts south-to-north mainline flows through the TSB at MP 517, reducing total available capacity from 1,536 Mdt/d design capacity to 1,300 Mdt/d available -- a loss of approximately 236 MMdt/d (0.236 Bcf/d) -- with primary firm shippers facing potential cuts of 5-12% based on historical utilization. An updated posting with an estimated return-to-service date is expected no later than September 30, 2026.
Transco CS 50 force majeure removes approximately 0.236 Bcf/d of south-to-north mainline capacity effective 9/29 UFN, expect bullish pressure at Transco Zone 4 and Zone 5/6 as northbound supply tightens, with primary firm shippers at 5-12% cut risk and no restoration timeline yet available.
Reroute: Limited: Transco is the dominant south-to-north mainline in this corridor; Southern Natural Gas (not monitored for live conditions) provides partial Southeast alternative capacity but cannot fully replace Transco mainline throughput for Mid-Atlantic and Northeast deliveries. Tennessee Gas Pipeline offers some competing capacity for Northeast markets but is unlikely to absorb the full constraint volume.
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Transco
Unplanned Maintenance Compressor Station 517 MU5 Outage - Notice of Force Majeure Event
SEV 4/5
Force Majeure2.375 Bcf/dUntil Further Notice
Transco declared force majeure at Compressor Station 517 Main Unit 5 (Leidy Line, MP 127.96) due to equipment failure, limiting primary firm transportation west-to-east through Station 517 effective December 14, 2025 ID2 cycle. Available primary firm capacity is restricted to 2,375 MDth/d (2.375 Bcf/d), representing 30-40% potential cuts to primary firm shippers based on historical utilization. Estimated return to full service was December 24, 2025 to January 1, 2026, with no confirmed end date posted; this is Revision 3 of a notice originally posted December 14, 2025, and the event dates are approximately 8 months prior to the Last Updated timestamp of August 20, 2026, suggesting this is a legacy repost or administrative revision of an event that resolved in late 2025.
Legacy repost or administrative revision of a December 2025 force majeure event -- Transco CS 517 MU5 restricted 2.375 Bcf/d of primary firm west-to-east capacity with 30-40% firm cuts; market impact was priced at the original December 14, 2025 effective date and no new trading signal applies.
Reroute: Limited: Transco is the dominant Southeast-to-Northeast pipeline and Southern Natural Gas (unmonitored) provides partial alternative capacity in overlapping Southeast corridors, but cannot fully offset primary firm curtailments of this magnitude; Tennessee Gas Pipeline (TGP) serves similar Northeast markets but competing capacity may have been tight during the December 2025 winter period.
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Transco
Update - Market and Production Constraints
SEV 4/5
Capacity ConstraintUntil Further Notice1 Days
Transco has posted a system-wide market and production constraint notice effective August 11, 2026, covering multiple throughput section boundaries (TSBs) across Zones 2 through 6. Numerous delivery TSBs are at zero available capacity including SELA (both directions), Central Penn South, NY Bay Lateral, Mainline Milltown, and Rivervale Lateral, with HBLV swing availability also at zero across Zones 2 through 6. An unplanned maintenance constraint is active at Compressor Station 70 MP 662 (Zone 4 receipt, southbound) alongside planned maintenance at CS 160 and ML S35, indicating simultaneous pressure from both unplanned and scheduled events across the system.
Widespread Transco TSB constraints at zero available capacity across Zones 4-6 -- including SELA, Central Penn South, NY Bay Lateral, and Mainline Milltown -- signal a tightly packed system with no swing buffer (HBLV zero Zones 2-6); expect bullish pressure at Transco Zone 4 Southeast and Zone 6 NY basis versus Henry Hub, with highest risk of curtailment at secondary and interruptible service classes on August 11.
Reroute: Limited: Southern Natural Gas (SNG/EGT) provides partial alternative for Southeast Zone 4 volumes, but cannot replace Transco's scale; Tennessee Gas Pipeline offers partial Northeast/Mid-Atlantic reroute but is also frequently constrained in summer peak; no reroute exists for Florida deliveries via FGT if Transco Zone 2 SWLA lateral constraint (40 Mdt/d available) tightens further.
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Transco
Notice of Force Majeure Event - Unplanned Outage Station 70 Main Unit 9
SEV 4/5
Force Majeure0.865 Bcf/dUntil Further Notice
Transco declared force majeure on August 7, 2026 due to an unplanned equipment failure at Compressor Station 70 (MP 662), restricting south-to-north throughput effective ID2 8/7/2026 with no stated return-to-service date. Design capacity at the TSB is 3,344 MDth/d but available primary firm transportation is reduced to 2,479 MDth/d, implying a loss of approximately 865 MDth/d (0.865 Bcf/d) of northbound capacity. Potential shipper cuts of 0-15% on primary firm service are indicated, with major repairs anticipated before full restoration.
Transco FM at Station 70 removes approximately 0.865 Bcf/d of northbound capacity with no restoration timeline; expect bullish pressure on Transco Zone 4 and Zone 5 basis as Southeast and Mid-Atlantic shippers compete for reduced northbound scheduling space, with mild upward bias at Henry Hub given Transco's dominant role in Gulf Coast-to-Northeast flows.
Reroute: Limited: Southern Natural Gas (SNG/EGT) provides partial alternative for Southeast volumes, but SNG capacity is significantly smaller than Transco and cannot absorb a full 0.865 Bcf/d displacement; Tennessee Gas Pipeline serves overlapping Northeast markets but may also face summer throughput constraints, leaving meaningful volumes without viable reroute.
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Transco
Update - Market and Production Constraints
SEV 4/5
Capacity ConstraintUntil Further Notice1 Days
Transco has posted a critical market and production constraints notice effective August 4, 2026, showing widespread capacity restrictions across multiple zones from the Gulf Coast to the Northeast. Key constraints include SELA laterals (Zone 3) at 0 MDt/d for both directions, SWLA Lat at 40 MDt/d NSRP only, Mainline Milltown (Zone 6) at 0 NSRP, NY Bay Lateral at 0 Secondary, Central Penn South at 0 Secondary, and multiple Zone 5 segment TSBs at 0-200 MDt/d NSRP, indicating severe northbound flow restrictions from the Southeast through the Mid-Atlantic. No end date is specified, suggesting conditions are operationally driven on a daily basis with no defined restoration timeline.
Widespread Transco constraint notice with zero available capacity at multiple key Zone 3, 5, and 6 TSBs signals significant northbound flow restrictions; expect bullish pressure at Transco Zone 4, Zone 5, and Zone 6 basis points versus Henry Hub, with particular tightness in Mid-Atlantic and Northeast delivery markets on August 4.
Reroute: Limited: Southern Natural Gas (SNG/EGT) provides partial alternative for Southeast segment volumes, and Tennessee Gas Pipeline serves overlapping Northeast markets, but Transco's dominant capacity share in the Southeast-to-Northeast corridor means partial reroute at best; Zone 6 Mid-Atlantic and Northeast volumes have minimal viable alternatives.
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Showing 32 of 1,130 active notices: every severity 4–5 notice and everything
posted in the last 7 days. The other 1,098 are older routine postings (mostly severity 1–3).
The largest-volume interstate gas pipeline in the U.S. It carries Gulf Coast and, increasingly, Marcellus supply to the Southeast, Mid-Atlantic and New York markets, and feeds several Gulf Coast LNG export terminals.
Operated by
Williams
Runs
South Texas and the Louisiana Gulf Coast to New York City, through the Southeast and Mid-Atlantic
Trading points
Transco Zone 1–6 (Zone 4, Zone 5, Zone 6 NY, Zone 6 non-NY), Leidy, Station 65, Station 85
Mapped facilities
Station 50 (Eunice), Station 60 (St. Francisville), Station 70 (Tylertown), Station 80 (Sanderville), Station 115 (Newnan), Station 110 (Wadley), Station 517 (Benton), Station 35 (Houston)
Line from EIA pipeline data; dots are facilities named in this pipeline’s notices (HIFLD locations). Dashed lines are schematic.
