TSP Name: Northwest Pipeline LLC TSP: 67977322
Critical: Y
Notice Stat Desc: SUPERSEDE
Notice Type Desc: MAINTENANCE
Post D/T: 09/22/2025 7:15 AM MCT
Notice Eff D/T: 09/22/2025 7:15 AM MCT
Notice End D/T:
Reqrd Rsp Desc: No response required
Rsp D/T:
Notice ID: 25-161
Prior Notice: 25-139
Subject: Update Chehalis Unplanned Maintenance
Notice Text:
Northwest is in the process of returning Unit #1 to service
with the anticipated full in-service date of Gas Day October 1,
2025.
Please note that flow volumes might fluctuate over the next few
days as we are commissioning, and there may be days when flow
could exceed the 600,000 Dth/d southbound constraint.
Northwest will continue to mitigate Operational Flow Orders
(OFO) and deficiency impacts at the Chehalis compressor station
on an operationally available basis, as referenced in Notice ID
25-139. Any changes or updates to the schedule will be promptly
communicated via the Northwest Pipeline Portal.
Northwest Pipeline is working diligently to safely bring this
station back into service as quickly as possible to minimize
any impacts.
Shippers can monitor throughput quantities and obtain a copy of
Northwest’s OFO procedures on Northwest’s website at
www.northwest.williams.com.
If you have any questions, please contact your Commercial
Services Representative or the hotline at 713-215-6301.
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