CAPACITY REDUCTION GLGT – Rapid River CS9 (Posted: 10/1/26)
SEV 4/5Compressor Issue0.504 Bcf/dUntil further notice
Summary
Great Lakes Gas Transmission declared unplanned maintenance at Rapid River Compressor Station 9 effective October 1, 2026, with a critical capacity reduction taking effect October 2 until further notice. Eastbound capacity at Crystal Falls CS (LOC #3911656) will be reduced by 504 MMcf/d (0.504 Bcf/d), leaving only 1,210 MMcf/d (1.210 Bcf/d) of eastbound capacity. GLGT explicitly warns this may result in Firm Primary curtailments, estimating 22% impact to Firm Primary service, with Reservation Charge Crediting triggered under Section 6.10.3(d).
Trading note
Unplanned GLGT compressor outage removes 0.504 Bcf/d of eastbound capacity until further notice with confirmed 22% Firm Primary impact; expect bullish pressure at Chicago Citygate, Emerson/Viking GL, and Dawn Ontario basis as Western Canadian supply routed through GLGT is curtailed, with the no-restoration-timeline and firm service curtailment language supporting a sustained tightness signal in Upper Midwest markets.
Reroute potential
Limited: GLGT is a primary Western Canadian import path into the Upper Midwest and Michigan; while ANR and TransCanada Mainline interconnect with the system, the constraint is on GLGT's own mainline eastbound segment and volumes scheduled on this path have limited immediate alternatives at comparable cost or capacity.
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View original notice text (as posted by Great Lakes Gas Transmission)
TSP Name: Great Lakes Gas Transmission Limited Partnership
Notice ID: 1240
TSP: 046077343
Notice Type: Maint
Notice Status: Initiate
Posting Date/Time: 10/01/2026 09:16
Notice Eff Date: 10/01/2026
Notice Eff Time: 09:20
Notice End Date: 10/31/2026
Notice End Time: 08:59
Critical: Yes
Required Response: No response required
Subject: CAPACITY REDUCTION GLGT – Rapid River CS9 (Posted: 10/1/26)
Message Text:
Great Lakes Gas Transmission has unplanned maintenance at Rapid River Compressor Station 9. As a result, capacity will be reduced as follows: 10/1 - Crystal Falls CS Eastbound (LOC #3911656)– No incremental 10/2 - Until further notice – Crystal Falls CS Eastbound (LOC #3911656): 504 MMcf/d (leaving 1,210 MMcf/d) Great Lakes Gas Transmission anticipates that this may result in Firm Primary, Firm Secondary and Interruptible curtailments. The estimated impact to Firm Primary is 22%. The Reservation Charge Crediting Mechanism of Section 6.10.3(d) shall apply to this outage. This notice will be updated as more information becomes available. Please direct any questions to your Account Coordinator, Customer Service Representative, or the Nominations and Scheduling hotline @ 800-827-5267.
Cite thisEnercast Pipe Monitor, “CAPACITY REDUCTION GLGT – Rapid River CS9 (Posted: 10/1/26)” (Great Lakes Gas Transmission), posted 2026-10-01. https://enercast.com/notice/great-lakes-gas-transmission-1240-r1.html
