Williams Partners' Transco Pipeline Delivers Record Volumes

• Pipeline delivers one-day, record-breaking 15.58 million dekatherms
• Important pipeline infrastructure plays a vital role in keeping the country warm
• Record volume made possible by multiple expansions executed in 2017

As frigid weather conditions blanket the U.S., Williams Partners L.P. WPZ announced today that it has delivered a record amount of natural gas on its Transco interstate gas pipeline, providing essential services to gas distribution companies, power generators and other customers located along the Eastern Seaboard and Gulf Coast.

The nation's largest-volume natural gas transmission system, Transco delivered a record-breaking 15.58 million dekatherms (MMdt) on Jan. 5, 2018. The new peak-day mark surpasses the previous high that was set on Jan. 1, 2018. The Transco system, which stretches from South Texas to New York City, also established a new three-day market area delivery record, averaging 14.90 MMdt from Jan. 4 to Jan. 6, 2018.

The natural gas delivery records were made possible thanks to additional firm transportation capacity created by five fully-contracted Transco expansions completed in 2017. Together, Transco's "Big 5" expansions (Gulf Trace, Hillabee Phase 1, Dalton, New York Bay and Virginia Southside II) added more than 2.8 MMdt of firm transportation capacity to the existing pipeline system.

"The incremental capacity from the fully-contracted Transco expansion projects placed into service in 2017 reflects an increase of more than 25 percent in Transco's design capacity – which helped us be in position to meet the growing demand needs of our customers," said Alan Armstrong, chief executive officer of Williams Partners' general partner. "Our focused strategy on natural gas infrastructure in support of consistent and sustainable growth in gas volumes continues to enhance our ability to meet the increasing demand for natural gas for heating, industrial use, clean-power generation and LNG as highlighted by these recent delivery records."

Armstrong added, "When you consider that natural gas reliably heats more than half of all U.S. homes, the current frigid conditions are an important reminder of the vital role transmission pipelines play in keeping millions of Americans safe and secure, especially during winter periods of peak demand."

As natural gas demand continues to increase, construction is currently underway on two additional Transco projects (Atlantic Sunrise and Garden State Phase II), which are designed to create approximately 1.9 MMdt of additional pipeline capacity in 2018.

Transco, the nation's largest-volume and fastest-growing interstate natural gas pipeline system, is a wholly owned subsidiary of Williams Partners L.P. Transco delivers natural gas to customers through its 10,200-mile pipeline network whose mainline extends nearly 1,800 miles between South Texas and New York City. The system is a major provider of cost-effective natural gas services that reaches U.S. markets in 12 Southeast and Atlantic Seaboard states, as well as international markets.

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 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 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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