TSP Name: Northwest Pipeline LLC TSP: 67977322
Critical: Y
Notice Stat Desc: SUPERSEDE
Notice Type Desc: MAINTENANCE
Post D/T: 05/07/2026 9:15 AM MCT
Notice Eff D/T: 05/07/2026 9:15 AM MCT
Notice End D/T:
Reqrd Rsp Desc: No response required
Rsp D/T:
Notice ID: 26-110
Prior Notice: 26-109
Subject: REVISED: Vernal ESD/Solar Inspections, Zillah ESD, & Mt. Vernon ESD - Maintenanc
Notice Text:
As posted in the maintenance schedule on Northwest Pipeline's
website, Northwest will be performing maintenance at the
following locations next week:
- Vernal CS: located at MP 330.25 in Uintah County, Utah
beginning gas day May 11, 2026, through gas day May 13,
2026.
- Zillah CS: located at MP 57.59 in Yakima County,
Washington beginning gas day May 11, 2026, through gas
day May 15, 2026.
- Mt. Vernon CS: located at MP 1440.18 in Skagit County,
Idaho Washington beginning gas day May 12, 2026,
through gas day May 13, 2026.
The Vernal CS will be limited to 331,000 Dth/d northbound and
242,000 Dth/d southbound for the duration of the outage.
If primary nomination requests through the Vernal CS exceeds
the available capacity of 331,000 Dth/d northbound or 242,000
Dth/d southbound (or whatever NWP cannot mitigate during any
day of the maintenance), pursuant to Sections 10.2 and 10.3 of
Rate Schedule TF-1 in Northwest's Tariff, Northwest will give
notice of a Declared Deficiency Period based on a design
capacity of 353,000 Dth/d northbound or 324,000 Dth/d
southbound. The deficiency period will continue until the work
has been completed.
The Zillah CS will be limited to 29,000 Dth/d northbound for
the duration of the outage.
If primary nomination requests through the Zillah CS exceeds
the available capacity of 29,000 Dth/d northbound (or whatever
NWP cannot mitigate during any day of the maintenance),
pursuant to Sections 10.2 and 10.3 of Rate Schedule TF-1 in
Northwest's Tariff, Northwest will give notice of a Declared
Deficiency Period based on a design capacity of 49,000 Dth/d
northbound. The deficiency period will continue until the work
has been completed.
The Mt. Vernon CS will be limited to 1,152,000 Dth/d southbound
for the duration of the outage.
If primary nomination requests through the Mt. Vernon CS
exceeds the available capacity of 1,152,000 Dth/d southbound
(or whatever NWP cannot mitigate during any day of the
maintenance), pursuant to Sections 10.2 and 10.3 of Rate
Schedule TF-1 in Northwest's Tariff, Northwest will give notice
of a Declared Deficiency Period based on a design capacity of
1,277,000 Dth/d southbound. The deficiency period will continue
until the work has been completed.
Additionally, the available southbound capacity at the Caldwell
CS referenced in Notice ID # 26-076 has increased from 363,000
Dth/d to 397,000 Dth/d effective in the ID1 cycle for gas day
May 07, 2026, through gas day May 23, 2026.
If primary nomination requests through the Caldwell CS exceeds
the available capacity of 397,000 Dth/d southbound (or whatever
NWP cannot mitigate during any day of the maintenance),
pursuant to Sections 10.2 and 10.3 of Rate Schedule TF-1 in
Northwest's Tariff, Northwest will give notice of a Declared
Deficiency Period based on a design capacity of 475,000 Dth/d
southbound. The deficiency period will continue until the work
has been completed.
Please reference the Maintenance Schedule tab at
www.northwest.williams.com for more information.
If you have any questions, please call your Commercial Services
Representative or the hotline at 713-215-6301.
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