Williams Partners’ Northwest Pipeline Seeks FERC Approval for North Seattle Lateral Upgrade Project

TULSA, Okla.–(BUSINESS WIRE)–Williams Partners L.P. (NYSE: WPZ) announced today that Northwest
Pipeline has filed an application with the Federal Energy Regulatory
Commission (FERC) seeking authorization for its North Seattle Lateral
Upgrade project in south Snohomish County in the state of Washington.

Northwest has executed firm agreements with Puget Sound Energy (PSE) for
the project to expand the delivery capabilities of Northwest Pipeline’s
North Seattle Lateral, which serves PSE customers. PSE operates
Washington’s largest natural gas distribution system serving nearly
800,000 gas customers in six counties.

“Our customers depend on safe, reliable and affordable natural gas
service. By partnering with Williams on the North Seattle Lateral
Upgrade project, we can continue to reliably serve customers in the
growing areas of south Snohomish and north King counties well into the
future,” said Shawnte Anderson, Puget Sound Energy’s Natural Gas project
manager.

Pending all federal, state and local regulatory approvals,
construction-related activities are scheduled to begin in the second
quarter of 2019 and would be completed in the fourth quarter of 2019.

“Demand for natural gas in the North Seattle region and other major
markets continues to grow as customers recognize its value as a clean,
affordable and abundant energy source,” said Walter Bennett, senior vice
president of Williams Partners’ West operating area. “The North Seattle
Lateral Upgrade project will add important energy infrastructure
necessary to meet the region’s growing demand for natural gas.”

Northwest, a wholly owned subsidiary of Williams Partners L.P., owns and
operates an existing interstate natural gas pipeline system, extending
from New Mexico’s San Juan Basin to the border of Canada in Sumas,
Washington. For more than 60 years, Williams Partners’ Northwest system
has been a primary artery for the transmission of natural gas to the
Pacific Northwest and Intermountain Region.

About Williams Partners

Williams Partners is an industry-leading, large-cap natural gas
infrastructure master limited partnership with a strong growth outlook
and major positions in key U.S. supply basins. Williams Partners has
operations across the natural gas value chain including gathering,
processing and interstate transportation of natural gas and natural gas
liquids. Williams Partners owns and operates more than 33,000 miles of
pipelines system wide – including the nation’s largest volume and
fastest growing pipeline – providing natural gas for clean-power
generation, heating and industrial use. Williams Partners’ operations
touch approximately 30 percent of U.S. natural gas. Tulsa, Okla.-based
Williams (NYSE: WMB), a premier provider of large-scale U.S. natural gas
infrastructure, owns approximately 74 percent of Williams Partners.

Portions of this document may constitute “forward-looking statements”
as defined by federal law. Although the partnership believes any such
statements are based on reasonable assumptions, there is no assurance
that actual outcomes will not be materially different. Additional
information about issues that could lead to material changes in
performance is contained in the partnership’s annual and quarterly
reports filed with the Securities and Exchange Commission.

Contacts

Williams Partners L.P.
Media Contact:
Sara Delgado,
918-573-2713
or
Investor Contact:
Brett Krieg,
918-573-4614