Williams Partners’ Geismar Olefins Plant Achieves 87% of Full Expanded Production Rate

Williams Partners L.P. (NYSE: WPZ) today announced its Geismar, Louisiana olefins plant is approaching its full expanded production rate. As of June 17, the plant’s ethylene production rate was at 4.63 million pounds per day, 87 percent of its full expanded production rate. It should also be noted that the plant is now maximizing propylene production. With the repairs made after a local electrical outage, an expansion plant transformer re-installed and the expansion equipment now online, the plant continues to make progress each day toward its full expanded production rate.

“Our primary objective this year is to once again be a reliable supplier of olefins to our customers and we are very pleased to be progressing toward expanded production at the plant,” said John Dearborn, senior vice president, NGL & Petchem Services. “We continue our emphasis on operational discipline and maintaining the excellent safety performance demonstrated by our Geismar team throughout this expansion process.”

The expanded ethylene production capacity at the plant is 1.95 billion pounds per year. Williams Partners’ share of the total capacity of the expanded plant is approximately 1.7 billion pounds per year.

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 and also in Canada. 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 North American natural gas infrastructure, owns 60 percent of Williams Partners, including all of the 2 percent general-partner interest. www.williams.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.

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Williams Partners L.P.Media Contact:Tom Droege, 918-573-4034orInvestor Contacts:John Porter, 918-573-0797orBrett Krieg, 918-573-4614