Williams Partners Prices $1.45 Billion of Senior Notes

TULSA, Okla.–(BUSINESS WIRE)–Williams Partners L.P. (NYSE: WPZ) today announced that it has priced a
public offering of $1.45 billion of its 3.75% Senior Notes due 2027 at a
price of 99.949% of par. The expected settlement date for the offering
is June 5, 2017, subject to customary closing conditions.

Williams Partners intends to use the net proceeds of the offering for
general partnership purposes, including repayment of its $1.4 billion
aggregate principal amount of 4.875% Senior Notes due 2023 or other of
its outstanding indebtedness.

BofA Merrill Lynch, Deutsche Bank Securities and RBC Capital Markets are
acting as joint book-running managers for the offering.

This news release is neither an offer to sell nor a solicitation of an
offer to buy any of these securities and shall not constitute an offer,
solicitation or sale in any jurisdiction in which such offer,
solicitation or sale is unlawful.

An automatic shelf registration statement relating to the notes was
previously filed with the Securities and Exchange Commission and became
effective upon filing. Before you invest, you should read the prospectus
in the registration statement and other documents the Company has filed
with the SEC for more complete information about the Company and the
offering. A copy of the prospectus supplement and prospectus relating to
the offering may be obtained on the SEC website at www.sec.gov
or from any of the underwriters including:

Deutsche Bank Securities Inc.
Attn: Prospectus Group
60 Wall
Street
New York, New York 10005-2836
1-800-503-4611
[email protected]

Merrill Lynch, Pierce, Fenner & Smith Incorporated
200 North
College Street
NC1-004-03-43
Charlotte, NC 28255-0001
Attn:
Prospectus Department
Toll-free: 1-800-294-1322
[email protected]

RBC Capital Markets, LLC
200 Vesey Street, 8th Floor
New York,
NY 10281
(866) 375-6829
[email protected]

About Williams Partners

Williams Partners (NYSE: WPZ) 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 from gathering,
processing and interstate transportation of natural gas and natural gas
liquids to petchem production of ethylene, propylene and other olefins.
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:
Keith Isbell,
918-573-7308
or
Investor Contacts:
John Porter,
918-573-0797
or
Brett Krieg, 918-573-4614