Williams Partners L.P. (NYSE: WPZ) today announced that it priced a public offering of 21,500,000 common units representing limited-partner interests at $49.00 per unit. The offering is expected to close on August 7, 2013. Williams Partners also granted the underwriters a 30-day option to purchase up to an additional 3,225,000 common units. Williams Partners plans to use the net proceeds from the offering to repay amounts outstanding under the partnership's commercial paper program, to fund capital expenditures and for general partnership purposes. Barclays is acting as the sole underwriter. A copy of the preliminary prospectus supplement and prospectus relating to the offering may be obtained by contacting Barclays c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, toll-free: (888) 603-5847, email@example.com. 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. A copy of the preliminary prospectus supplement and related base prospectus may be obtained on the SEC website at www.sec.gov or from the underwriter: Barclaysc/o Broadridge Financial Solutions1155 Long Island AvenueEdgewood, NY 11717Phone: 888-603-5847E-mail: Barclaysprospectus@broadridge.com About Williams Partners L.P. (NYSE: WPZ) Williams Partners L.P. is a leading diversified master limited partnership focused on natural gas transportation; gathering, treating, and processing; storage; natural gas liquid (NGL) fractionation; and oil transportation. The partnership owns interests in three major interstate natural gas pipelines that, combined, deliver 14 percent of the natural gas consumed in the United States. The partnership’s gathering and processing assets include large-scale operations in the U.S. Rocky Mountains and both onshore and offshore along the Gulf of Mexico. Williams (NYSE: WMB) owns approximately 68 percent of Williams Partners, including the general-partner interest. More information is available at www.williamslp.com, where the partnership routinely posts important information. 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. Any such statements are made in reliance on the “safe harbor” protections provided under the Private Securities Reform Act of 1995. Additional information about issues that could lead to material changes in performance is contained in the partnership’s annual reports filed with the Securities and Exchange Commission.