Great Lakes Gas Transmission (U.S.): 28 active notices, 1 rated severity 4–5; 4 posted in the last 7 days. 2 outages in effect today: 0.504 Bcf/d offline at Rapid River Compressor Station 9, expected back Oct 31; the other has no stated volume. Capacity Offline →
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Great Lakes Gas Transmission
MAINTENANCE SCHEDULE for Great Lakes Gas Transmission (Posted: 10/26/26)
Below alert threshold -- no detailed analysis performed.
Reroute: Not assessed.
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Great Lakes Gas Transmission
CAPACITY REDUCTION at Richfield
SEV 3/5
Capacity Constraint0.029 Bcf/d
Great Lakes Gas Transmission has declared a Critical Notice effective 10/1/2026 intraday, restricting capacity at Richfield (LOC#482605) to 0 MMcf/d due to gas quality tariff compliance issues, until further notice. The operating capacity at this receipt point is 0.029 Bcf/d, now fully curtailed, with GLGT warning of potential Firm Secondary and Interruptible curtailments. Duration is indeterminate with no restoration timeline given.
GLGT Richfield receipt point (0.029 Bcf/d) is restricted to zero capacity for gas quality compliance on an until-further-notice basis, tightening Canadian import flows into the Upper Midwest and pressuring Emerson/Viking GL and Chicago basis mildly higher, though the small absolute volume limits broader HH impact.
Reroute: Moderate: ANR and TransCanada Mainline interconnects serve overlapping Upper Midwest and Dawn markets, but rerouting depends on available capacity at those interconnects and shipper access; the small volume involved (0.029 Bcf/d) limits systemic reroute urgency.
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).
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: 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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Great Lakes Gas Transmission
MAINTENANCE SCHEDULE for Great Lakes Gas Transmission (Posted: 9/25/26)
