Columbia Gas Transmission (TCO) (Appalachia, Midwest): 94 active notices, 8 rated severity 4–5; 4 posted in the last 7 days. 1 outage in effect today (no volume stated) at Stonewall Gas Gathering Braxton Interconnect Meter 842867. Capacity Offline →
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TCO has issued a revision to its October 14, 2026 force majeure on MXP Line-100 in West Virginia, originally triggered by a detected leak near the Saunders Creek Regulator Station (a separate event from the September 24 force majeure on the same line). As of this update, MXPSEG remains at zero total capacity, with firm service impact estimated at 1.9 MMDth/day; TCO is estimating a return to service for Gas Day Saturday October 17, 2026, though the timeline is subject to change and Timely/Evening Cycle nominations for October 17 are likely to be impacted. The force majeure and capacity elimination remain fully in effect, and RCC eligibility requires 10 or more consecutive days of firm curtailment.
TCO force majeure on MXPSEG remains at zero total capacity with 1.9 Bcf/d of estimated firm service impact; targeted return is October 17 but is not guaranteed, keeping bearish pressure on Columbia Appalachia basis and mildly bearish pressure on Dominion South and TETCO M2 through at least the weekend gas days.
Reroute: Limited to moderate: TETCO (monitored) and Equitrans serve overlapping Appalachian markets, but TCO MXPSEG is very high capacity and 1.9 Bcf/d of stranded firm volumes cannot be fully absorbed by competing pipes without significant basis pressure at Columbia Appalachia pool.
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Columbia Gas Transmission (TCO)
REVISED: CAPACITY POSTING - TIM for October 16, 2026
TCO has declared a new Force Majeure effective Gas Day October 14, 2026, due to a detected leak near the Saunders Creek Regulator Station in West Virginia on MXP Line-100 -- explicitly separate from the September 24 FM (Notice 26276009). Effective the Evening Cycle of October 15 and until further notice, scheduled volumes through the MXPSEG MA42 internal constraint are reduced to zero total capacity, with estimated firm service impact of 1.9 MMDth/d (1.9 Bcf/d). Live capacity data at MXPSEG (loc_id MXPSEG, dir TD1:SGQ:FTS) already shows NON-FIRM-RESTRICTED with zero operating capacity posted against 1.85 Bcf/d scheduled as of the timely cycle on Oct 14, corroborating the constraint. TCO will provide an update by Friday morning October 16.
New TCO force majeure on MXP Line-100 eliminates 1.9 Bcf/d of Appalachian firm transport capacity to zero effective Oct 15 evening cycle (MXPSEG already NON-FIRM-RESTRICTED at 1.85 Bcf/d scheduled vs zero operating capacity in the Oct 14 timely cycle); expect significant bullish pressure on Dominion South, TETCO M2, and downstream Mid-Atlantic basis, with bearish pressure at Appalachian receipt points where gas backs up in-basin -- this is a second, independent TCO FM active simultaneously with the Sep 24 event.
Reroute: Limited to moderate: TETCO (monitored) and Equitrans serve overlapping Appalachian markets and provide partial reroute, but with 1.9 Bcf/d of firm capacity offline and a simultaneous active TCO force majeure from September 24 still in effect, the combined system stress severely limits practical bypass options for affected shippers.
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Columbia Gas Transmission (TCO)
LIFTED: OFO - Receipt Points in Market Areas 26, 30, 35, 41, 42, Eff. ID1 Tuesday, October 13, 2026
lifted ✓Restoration1.800 Bcf/dUntil Further Notice3 Days
TCO has lifted the Force Majeure on MXP Line-100 in West Virginia, effective Intraday 1 Cycle for Gas Day September 27, 2026 (with Timely Cycle restoration for September 28, 2026), reinstating full capacity through the MXPSEG MA42 internal constraint. The original force majeure was declared September 24, 2026 following detection of a leak at the Saunders Creek Regulator Station, which had reduced MXPSEG to zero total capacity and impacted an estimated 1.8 MMDth/day of firm service. The FM was active for approximately three gas days (September 24-27) before being lifted.
Restoration of 1.8 Bcf/d of MXPSEG capacity is bearish for Appalachian basis -- Columbia Gas Appalachia basis was trading at -1.060 vs Henry Hub as of September 25; expect that discount to widen modestly as previously backed-up Appalachian supply is released back into TCO downstream markets including TETCO M2 and Mid-Atlantic points.
Reroute: Moderate: Texas Eastern (TETCO, monitored) and Equitrans serve overlapping Appalachian markets; Transco provides partial Mid-Atlantic alternative. The original 1.8 Bcf/d firm impact was too large to fully offset on alternatives, so the restoration is fully market-moving.
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Columbia Gas Transmission (TCO)
COMPLETED: SM-80 Pipeline Maintenance Eff. ID1 Gas Day September 25, 2026
DT Midstream (DTM) has declared a Force Majeure at the Stonewall Gas Gathering (SGG) TCO West Braxton delivery meter (#842867), which feeds Columbia Gas Transmission (TCO). Effective 9/26/2026 Timely cycle, DTM is revising the FM upward: maximum capacity at the meter increases from 400,000 Dth/d to 550,000 Dth/d (0.550 Bcf/d), until further notice, with no estimated return to full normal capacity. The prior restriction beginning 9/23/2026 had reduced the meter to 400,000 Dth/d; this revision partially restores but does not eliminate the constraint.
DTM FM at Braxton (meter 842867) restricts TCO receipts to 0.550 Bcf/d until further notice -- live data shows the meter operating at 1.50 Bcf/d capacity with only 0.400 Bcf/d scheduled as of 9/25 Timely, but the new FM cap of 0.550 Bcf/d limits upside; Columbia Gas Appalachia basis, recently at -0.795 vs HH (most recent day 2026-09-24), faces upward pressure as Appalachian supply into TCO remains force-majeure constrained with no restoration timeline.
Reroute: Moderate: TCO interconnects with TETCO (monitored) and Equitrans (not monitored) in Appalachia, offering partial alternative routing for Marcellus/Utica producers, but the constraint is at the gathering level (DTM Stonewall SGG) and cannot be bypassed by upstream producers without alternative gathering infrastructure.
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Columbia Gas Transmission (TCO)
UPDATE: Force Majeure – MXP Line
SEV 5/5
Force Majeure1.800 Bcf/dUntil Further Notice
TCO declared force majeure on MXP Line-100 in West Virginia following detection of a gas leak at the Saunders Creek Regulator Station on September 24, 2026. As of September 25, 2026, MXPSEG MA42 is reduced to zero total capacity, eliminating an estimated 1.8 Bcf/d of firm service through this internal constraint; the outage is expected to persist at minimum through the weekend gas days September 26-28, with restoration timing still 'until further notice.' Live capacity data confirms TM MXP MA42 (loc_id TMMXP) is posting 0 Bcf/d scheduled against 0.500 Bcf/d operating capacity, consistent with the constraint being upstream of that delivery metering point, though the notice-stated firm impact of 1.8 Bcf/d is the controlling figure.
TCO force majeure on MXP Line-100 eliminates 1.8 Bcf/d of firm throughput through MXPSEG with no firm restoration date; expect significant bullish pressure on Dominion South and TETCO M2 basis as Appalachian supply is stranded, with downstream Mid-Atlantic and Midwest markets tightening -- Columbia Gas Appalachian basis was already at -0.795 vs HH on 2026-09-24 and is likely to narrow sharply or flip positive given the scale of firm curtailment.
Reroute: Limited: TETCO (monitored) and TCO itself are the primary Appalachian corridor pipes; at 1.8 Bcf/d of firm curtailment, competing capacity on TETCO M2 and Rover is unlikely to absorb the full volume, and any available headroom will clear at a premium basis.
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Columbia Gas Transmission (TCO)
UPDATE: Receipt Point OFO Lifted in Market Areas 41-42, Effective September 24, 2026
TCO has declared a Force Majeure on MXP Line-100 in West Virginia following detection of a leak at the Saunders Creek Regulator Station on September 24, 2026. Effective the Timely Cycle for Gas Day September 25, 2026, MXPSEG is reduced to zero total capacity with an estimated firm service impact of 1.8 MMDth/d (1.8 Bcf/d); the Force Majeure remains in effect until further notice with no restoration timeline provided. This is Revision 1 (superseding prior notice 26276009), but it meets escalation trigger criteria -- force majeure active, firm service eliminated at 1.8 Bcf/d scale, and 'until further notice' duration -- and must be scored as a fresh high-severity event.
TCO force majeure eliminates 1.800 Bcf/d of MXPSEG firm capacity until further notice; live capacity data confirms MXPSEG MA42 (loc MXPSEG) posted at 0 Bcf/d operating capacity with 1.84 Bcf/d scheduled and flagged NON-FIRM-RESTRICTED as of the timely cycle 2026-09-24, fully corroborating the notice -- expect sharp bullish pressure at Dominion South and Columbia Gas Appalachia basis (most recently -1.505 vs HH on 2026-09-23, likely to tighten significantly) and spillover bullish pressure at TETCO M2 and Transco Zone 4 as Appalachian supply backs out of downstream Mid-Atlantic and Midwest markets.
Reroute: Limited to moderate: TETCO (monitored) and Equitrans serve overlapping Appalachian markets and provide some partial reroute potential, but TCO is a very high-capacity system and a 1.8 Bcf/d firm-service loss at a single internal constraint is extremely difficult to fully offset; no restoration timeline increases the duration risk significantly.
TCO has declared a Force Majeure effective Gas Day September 24, 2026 (Intraday 1 cycle) due to an unexpected mechanical issue on MXP Line-100 between Mt. Olive Compressor Station and Saunders Creek Regulator Station in West Virginia. Effective the Timely Cycle for September 25, 2026, and until further notice, the MXPSEG MA42 internal constraint is reduced to zero total capacity, with estimated firm service impact of 1.8 MMDth/day. TCO targets an update by Friday morning, September 25, with no restoration timeline currently committed.
TCO force majeure on MXPSEG MA42 eliminates 1.8 Bcf/d of scheduled firm capacity from Gas Day September 25 until further notice; the live capacity table confirms MXPSEG (loc_id MXPSEG) is already posted at 0 Bcf/d operating capacity with 1.84 Bcf/d scheduled and flagged NON-FIRM-RESTRICTED, corroborating the impact; Columbia Gas Appalachia basis has been running at approximately -1.505 vs Henry Hub (as of 2026-09-23) and is likely to tighten sharply as Marcellus/Utica supply is stranded within the MA42 market area until the line is restored.
Reroute: Limited: TCO is a high-capacity Appalachian system and TETCO M2, TCO, and Equitrans serve overlapping markets, but the 1.8 Bcf/d firm impact on an internal constraint (MXPSEG MA42) is large relative to available spare capacity on competing pipes; partial reroute via TETCO (monitored) is possible but unlikely to absorb the full volume on short notice.
DT Midstream Stonewall Gas Gathering has declared a Force Majeure at the TCO West Braxton delivery meter (842867), effective 9/23/2026 ID1 cycle, reducing maximum capacity at that meter to 400,000 Dth/d (0.400 Bcf/d) until further notice with no estimated return to normal capacity. TCO is coordinating with DTM but cannot provide a restoration timeline. The live capacity table shows Braxton (loc 842867) was posting 1.50 Bcf/d operating capacity with 0.981 Bcf/d scheduled as of the timely cycle on 9/23/2026, confirming a material reduction from the pre-event operating level to the FM-capped 0.400 Bcf/d ceiling.
DT Midstream FM at Braxton (842867) cuts TCO receipt capacity by approximately 1.1 Bcf/d from the timely-cycle scheduled level to a 0.400 Bcf/d cap with no return date; Columbia Gas Appalachia basis was already trading at -1.500 vs Henry Hub on 2026-09-21 (five-day average -1.384), and this unresolved FM curtailment of Appalachian supply into TCO is supportive of a tightening (less negative) Columbia Gas App basis, with neutral-to-mildly-bearish signal for Henry Hub as downstream Mid-Atlantic and Midwest markets lose Appalachian supply.
Reroute: Limited: TCO is a dominant Appalachian transmission system; TETCO (monitored) and Equitrans serve overlapping Appalachian markets and may absorb some displaced volume, but the 'until further notice' duration and scale of the FM at Braxton -- one of the larger receipt points on the system -- limits full offset, and no single alternative gathering system replaces Stonewall Gas Gathering's Braxton feed.
Below alert threshold -- no detailed analysis performed.
Reroute: Not assessed.
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Columbia Gas Transmission (TCO)
OFO – Receipt Points in Market Areas 26, 30, 35, 41, 42, Effective September 12, 2026
SEV 3/5
Operational AlertUntil Further Notice
TCO has issued an Operational Flow Order effective Gas Day September 12, 2026 for receipt points in Market Areas 26, 30, 35, 41, and 42, requiring shippers to keep physical receipts at or below scheduled quantities to protect system integrity amid mild weather, lower demand, and elevated storage and linepack levels. The OFO continues until further notice, with penalties assessed on excess receipts beyond a 5% or 5,000 Dth tolerance. No specific capacity volume is stated; the constraint is a receipt-cap across five Appalachian market areas, not a hard capacity loss.
TCO OFO caps Appalachian receipts in MAs 26, 30, 35, 41, and 42 effective Sept 12; no concrete curtailment volume stated, but the action is bearish Columbia Gas Appalachia basis -- already averaging -1.275 vs Henry Hub over the five days ended Sept 9 (most recently -1.140 on Sept 9) -- as Marcellus/Utica gas is forced back into the basin with no new downstream demand catalyst.
Reroute: Moderate: Texas Eastern (TETCO, monitored) and Equitrans serve overlapping Appalachian markets, and Transco provides partial Mid-Atlantic alternative; however, a basin-wide receipt cap driven by oversupply and elevated linepack means reroute does not resolve the fundamental oversupply condition at the source.
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Columbia Gas Transmission (TCO)
Critical Day for Storage Injections: Effective Saturday, September 12, 2026
Below alert threshold -- no detailed analysis performed.
Reroute: Not assessed.
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Columbia Gas Transmission (TCO)
OFO – Receipt Points in Market Areas 26, 30, 35, 41, 42, Effective September 5, 2026
SEV 3/5
Operational AlertUntil Further Notice
TCO has issued a formal OFO effective Gas Day September 5, 2026, requiring shippers with receipts in Market Areas 26, 30, 35, 41, and 42 to align physical receipts at or below scheduled quantities. The OFO is driven by mild weather, reduced market demand, and elevated storage and linepack levels causing excess Appalachian production to threaten system integrity. The order runs until further notice, with penalties up to three times the Columbia Gas Appalachia spot price for non-compliant shippers.
TCO receipt-side OFO across five Appalachian market areas caps physical injections and forces upstream producers to curtail flows into the basin, adding bearish pressure to Columbia Gas Appalachia basis, which was already at -1.265 vs Henry Hub on 2026-09-03 (five-day average -1.122); no volume cap is stated, but the open-ended duration and system-wide geographic scope across MAs 26, 30, 35, 41, and 42 keeps downward pressure on Dominion South and TETCO M2 as excess supply is trapped in the Appalachian basin.
Reroute: Limited: the OFO restricts the receipt side of TCO's Appalachian network; affected producers have few near-term alternatives as TETCO (monitored) and TCO are the two dominant Appalachian takeaway pipes, and any TCO receipt constraint that backs gas up in the basin similarly pressures available TETCO capacity at M2 points. Some modest diversion to Rover or REX Zone 3 is possible but unlikely to absorb material volumes given the broad market-area scope of the OFO.
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Columbia Gas Transmission (TCO)
Critical Day for Storage Injections, Effective Saturday, September 5, 2026
Below alert threshold -- no detailed analysis performed.
Reroute: Not assessed.
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Columbia Gas Transmission (TCO)
Force Majeure: Emporia Compressor Station
SEV 3/5
Force MajeureUntil Further Notice
TCO has declared force majeure effective January 23, 2026 due to an unexpected mechanical failure at Emporia Compressor Station Unit 3 in Greensville County, Virginia. As of this third revision (last updated March 20, 2026), TCO states there is no anticipated commercial impact under current operating conditions, but the Emporia VA-34 interconnect (E13) may be restricted if pressures or nominations fluctuate. No restoration timeline has been provided and the force majeure remains active with no confirmed curtailments.
Force majeure remains active at TCO Emporia CS with no confirmed volume curtailments and no restoration date; monitor Transco Zone 4 and Dominion South basis for any tightening if E13 interconnect restrictions are triggered.
Reroute: Moderate: Texas Eastern (TETCO, monitored) and Equitrans serve overlapping Appalachian/Mid-Atlantic markets, providing partial reroute options if commercial restrictions materialize at the Emporia E13 interconnect.
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About Columbia Gas Transmission (TCO)
A dense Appalachian network that gathers Marcellus and Utica supply and serves Mid-Atlantic and Midwest utilities, with large storage fields and laterals such as Mountaineer Xpress (MXP).
Operated by
TC Energy
Runs
Appalachia: Pennsylvania, Ohio, West Virginia, Kentucky, Virginia, Maryland and New York
