Williams Partners’ New York Bay Expansion Project Has Been Placed Into Service; Enables Increased Natural Gas Deliveries to New York City

TULSA, Okla.–(BUSINESS WIRE)–Williams Partners L.P. (NYSE: WPZ) today announced that it has placed
into service an expansion of its Transco pipeline system to increase
natural gas delivery capacity to New York City by 115,000 dekatherms per
day in time for the 2017/2018 heating season.

The New York Bay Expansion provides additional firm transportation
capacity for much-needed incremental natural gas supplies to National
Grid, the largest distributor of natural gas in the northeastern U.S.
The company provides service to 1.8 million customers in Brooklyn,
Queens, Staten Island and Long Island.

“As we have seen with the recent storms that have devastated other
states and neighboring regions, the security of energy supply needs to
be protected and enhanced. A secure and resilient supply of natural gas
is critical to the local New York City and Long Island communities we
serve,” said Ken Daly, President, National Grid New York. “Williams’ New
York Bay Expansion project will help ensure safe, reliable and secure
energy to meet our customers’ needs.”

The New York Bay Expansion Project included horsepower additions at
three existing Transco compressor facilities, in addition to
modifications to existing meter and regulator stations in New Jersey,
Pennsylvania and New York.

“Our Transco pipeline has a long history of providing New York City with
safe, reliable natural gas service,” said Micheal Dunn, Williams’
executive vice president and chief operating officer. “Our New York Bay
Expansion project continues that long-standing commitment, providing
additional supplies of affordable natural gas to support the region’s
economic vitality and ensure a reliable energy supply to the New York
City area.”

The New York Bay Expansion is the fourth of Williams Partners’ projected
five fully-contracted Transco expansion projects to be placed into
service this year, combining with Gulf Trace, Hillabee Phase 1 and the
Dalton Expansion to add more than 2.5 million dekatherms per day
capacity to the Transco pipeline system so far in 2017. The partnership
continues to target a fourth-quarter 2017 in-service date for its fifth
Transco expansion this year – the Virginia Southside II project.

Transco, the nation’s largest-volume and fastest-growing interstate
natural gas pipeline system, has reliably served New York City for more
than 60 years and currently delivers about half of all of the natural
gas consumed in the city. A wholly owned subsidiary of Williams Partners
L.P., Transco delivers natural gas to customers through its 10,000-mile
pipeline network whose mainline extends nearly 1,800 miles between South
Texas and New York City. The system is a major provider of
cost-effective natural gas services that reach U.S. markets in 12
Southeast and Atlantic Seaboard states.

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:
Christopher
Stockton, 713-562-2939
or
Investor Contact:
Brett
Krieg, 918-573-4614