Williams Partners’ Transco Prices Private Debt Issuance

TULSA, Okla.–(BUSINESS WIRE)–Transcontinental Gas Pipe Line Company, LLC (“Transco”), a wholly owned
subsidiary of Williams Partners L.P. (NYSE: WPZ), announced that it has
priced its previously announced offering of senior notes.

The $400 million in aggregate principal amount of senior notes due 2028
were priced with a 4.000 percent coupon and at an offering price of
99.446 percent of par, with a yield to investors of 4.068 percent. The
$600 million in aggregate principal amount of senior notes due 2048 were
priced with a 4.600 percent coupon and at an offering price of 99.276
percent of par, with a yield to investors of 4.645 percent. Each series
of notes is scheduled to be delivered on March 15, 2018, subject to the
satisfaction of customary closing conditions.

Transco intends to use the net proceeds from the offering to repay
indebtedness, including Transco’s $250 million of 6.05% senior notes due
2018 upon their maturity on June 15, 2018, and for general corporate
purposes, including the funding of capital expenditures.

The notes will be offered pursuant to certain exemptions from
registration under the Securities Act of 1933, as amended (the
“Securities Act”). The offering of the notes has not been registered
under the Securities Act or applicable state securities laws. The notes
may not be offered or sold in the United States absent registration or
an applicable exemption from such registration requirements.

This press release is for informational purposes only and does not
constitute an offer to sell or a solicitation of an offer to buy the
notes described in this press release, nor shall there be any sale of
the notes in any state or jurisdiction in which such an offer, sale or
solicitation would be unlawful prior to registration or qualification
under the securities laws of such jurisdiction.

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 Transco 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 Transco’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 Contact:
Brett Krieg,
918-573-4614