Pursuant to 18 CFR §358.7(e)(3) and the
Federal Energy Regulatory Commission’s Order No. 717, related orders, and the Standards
of Conduct, Northwest Pipeline hereby posts information concerning merger
partners as Affiliates that may employ or retain Marketing Function Employees.
December 15, 2022, Williams Companies announced that it
entered into an agreement to acquire MountainWest Pipelines Holding Company
from Southwest Gas Holdings, Inc. The transaction is expected to close in 2023,
subject to regulatory approvals.