Williams Partners L.P. Announces Public Offering of Common Units

Williams Partners (NYSE: WPZ) announced today that it intends to commence an underwritten public offering of 8,500,000 common units representing limited-partner interests. The units will be offered by Williams Partners pursuant to an effective shelf registration statement on file with the Securities and Exchange Commission.

The underwriters have been granted a 30-day option to purchase up to an additional 1,275,000 common units.

Williams Partners plans to use the net proceeds from the offering to repay amounts outstanding under the partnership’s credit facility. Borrowings under the credit facility were used to fund capital expenditures and working capital. To the extent there are net proceeds from this offering in excess of the outstanding balance under the credit facility, they will be used for general partnership purposes.

Barclays, Citigroup, BofA Merrill Lynch, Morgan Stanley, UBS Investment Bank, Jefferies, Credit Suisse and Wells Fargo are acting as joint book-running managers. In addition, J.P. Morgan; Goldman, Sachs & Co.; Deutsche Bank Securities; RBC Capital Markets; and Raymond James have been named as co-managing underwriters.

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 any of the underwriters, including:

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.

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.

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.