Northwest Notice 26-110

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.