03/18/2026- AGT Hourly Customer Specific Operational Flow Order
SEV 4/5
Operational AlertUntil Further Notice
Algonquin Gas Transmission has issued a system-wide Hourly Customer Specific Operational Flow Order (OFO) effective March 18, 2026, and continuing until further notice (notice end date listed as June 16, 2026). The OFO imposes a No Deficiency Point constraint of 25%/250 on an hourly basis for all customers system-wide, indicating active system stress requiring shippers to maintain balanced or surplus positions on an intra-day basis. No specific capacity volume is stated, but the 'until further notice' language and system-wide scope signal an unresolved operational constraint.
Algonquin system-wide Hourly OFO active from March 18 with no firm restoration date -- expect significant bullish pressure at Algonquin Citygate and broader New England basis as shippers scramble to comply with hourly balancing requirements, with heightened spike risk given no reroute alternative exists for core New England deliveries.
Reroute: Limited to none: Algonquin and Iroquois are the two primary pipelines serving New England; Iroquois is not reported constrained at this time but cannot absorb full Algonquin system shortfall. No meaningful reroute exists for the core New England LDC market.
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Northern Border Pipeline (NBPL)
Northern Border Low Inventory OFO
SEV 4/5
Operational AlertUntil Further Notice
Northern Border Pipeline has issued an active OFO effective immediately and until further notice due to low system inventory and linepack concerns driven by sustained cold weather. Shippers are required to stay within 5% or 25,000 Dth/day of posted nominations, with NBPL reserving the right to impose prorated meter capacity restrictions. The OFO was originally posted January 20, 2026 and this revision (Rev 3) confirms the OFO remains in effect through at least January 30, 2026.
Active NBPL OFO with no-notice curtailment authority and an 'until further notice' posture tightens Canadian gas flows into the Chicago/Midwest corridor, supporting bullish basis pressure at Chicago Citygate and NGPL Midcontinent vs Henry Hub.
Reroute: Limited: Alliance Pipeline provides an alternative Canadian border crossing into Chicago, but Alliance volumes are typically fully subscribed, especially during cold weather events, limiting meaningful displacement of constrained NBPL capacity.
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Northern Border Pipeline (NBPL)
UPDATE: OFO - Under Performance, Effective ID1 Gas Day January 21
SEV 4/5
Operational Alert0.740 Bcf/dUntil Further Notice
NBPL has issued a Revision 3 OFO for under-performance, active since January 21, 2026 and continuing until further notice. Receipt capacity at Stateline is capped at 100,000 MMBtu/d and Spring Creek at 640,000 MMBtu/d, combining for approximately 0.740 Bcf/d of constrained Canadian border receipt capacity. This revision escalates prior capacity limits (Stateline was 50,000 and Spring Creek was 600,000 in the Timely cycle) and the OFO remains active with no restoration timeline, indicating ongoing supply under-delivery from the Canadian side.
Active NBPL OFO with 0.740 Bcf/d of combined border receipt capacity constrained until further notice tightens Canadian gas imports into the Midwest; expect bullish pressure at Chicago Citygate and NGPL Midcontinent basis versus Henry Hub with no defined restoration date amplifying the signal.
Reroute: Limited: Alliance Pipeline provides an alternative Canadian import corridor into Chicago but is typically fully subscribed; partial mitigation is possible but NBPL volumes cannot be fully replaced, leaving Midwest markets structurally short on Canadian supply.
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El Paso (EPNG)
[FORCE MAJEURE] Force Majeure – Casa Grande C Station
SEV 4/5
Force MajeureUntil Further Notice1 Days
EPNG has declared force majeure at Casa Grande C Compressor Station, effective 03/17/2026 at 11:41 AM with an expected restoration by 03/18/2026 at 9:00 AM. Casa Grande is located in Arizona on EPNG's westbound mainline, meaning this constraint affects gas movement from the Permian/Waha origin area toward SoCal Border and Arizona delivery points. No specific capacity volume was stated in the notice. Duration is approximately one day.
EPNG force majeure at Casa Grande C Station restricts westbound flow on the Permian-to-SoCal/Arizona corridor; expect bearish pressure at Waha as basin gas backs up and bullish pressure at SoCal Border and Arizona delivery points for the next ~22 hours.
Reroute: Moderate: Transwestern Pipeline (TW) is the primary competing westbound pipeline serving SoCal Border and Arizona markets and may absorb some displaced volumes, though available spare capacity on TW will determine how fully the constraint can be offset.
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Energy Transfer
[Enable Mississippi River Transmission] [Oper Alert] Warm Weather SPW
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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Energy Transfer
[Enable Mississippi River Transmission] [Oper Alert] Warm Weather SPW TERMINATED
Below alert threshold -- no detailed analysis performed.
Reroute: Not assessed.
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Northern Border Pipeline (NBPL)
UPDATE: OFO - Under Performance, Effective ID2 Gas Day January 21
SEV 2/5
Informational0.855 Bcf/d
This is Revision 3 of an OFO under-performance notice originally issued January 21, 2026, now reposted on March 20, 2026. The current revision updates North Roosevelt receipt capacity to 115,000 Dth/d (from 100,000 Dth/d) while Stateline (100,000 Dth/d) and Spring Creek (640,000 Dth/d) remain unchanged, for a combined capped receipt capacity of approximately 855,000 Dth/d across the three locations. No new escalation triggers are present relative to the prior revision; the OFO and capacity caps remain in place with no restoration timeline.
No new market impact -- operational situation unchanged from prior revision, market has already priced this constraint.
Reroute: Limited: Alliance Pipeline provides partial alternative Canadian gas import capacity into Chicago, but is typically fully subscribed; NBPL remains the dominant Western Canadian supply conduit into the U.S. Midwest and no fully offsetting reroute exists.
