Williams Partners L.P. (NYSE: WPZ) ("Williams Partners") today announced that it has priced a public offering of $800 million of its 4.85 percent Senior Notes due 2048 at a price of 99.515 percent of par. The expected settlement date for the offering is March 5, 2018, subject to customary closing conditions.

Williams Partners intends to use the net proceeds of the offering for general partnership purposes, including repayment of its $750 million aggregate principal amount of 4.875% Senior Notes due 2024 or other of its outstanding indebtedness.

Citigroup, Morgan Stanley and MUFG 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 (the "SEC") and became effective upon filing. Before you invest, you should read the prospectus in the registration statement and other documents Williams Partners has filed with the SEC for more complete information about Williams Partners 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:

Citigroup Global Markets Inc.c/o Broadridge Financial Solutions1155 Long Island AvenueEdgewood, NY 11717Toll free: (800) 831-9146

Morgan Stanley & Co. LLCAttn: Prospectus Department180 Varick Street, 2nd FloorNew York, NY 10014

MUFG Securities Americas Inc.1221 Avenue of the Americas, 6th FloorNew York, NY 10020Attention: Capital Markets GroupTelephone: 877-649-6848

About Williams Partners

Williams Partners (NYSE: WPZ) is an industry-leading, large-cap natural gas infrastructure master limited partnership with operations across the natural gas value chain including gathering, processing and interstate transportation of natural gas and natural gas liquids. With major positions in top U.S. supply basins, 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 connecting U.S. natural gas and natural gas products to growing demand for cleaner fuel and feedstocks, 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.

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