Williams Partners Seeks FERC Approval for Southeastern Trail Expansion Project to Serve Growing Demand for Natural Gas in Mid-Atlantic and Southeastern U.S.

TULSA, Okla.–(BUSINESS WIRE)–Williams Partners L.P. (NYSE: WPZ) announced today that Transco has
filed an application with the Federal Energy Regulatory Commission
(FERC) seeking authorization for its Southeastern Trail expansion
project, which would create 296,375 dekatherms per day of additional
firm transportation capacity to markets in the Mid-Atlantic and
Southeastern U.S. for the 2020/2021 winter heating season.

Transco, the nation’s largest-volume and fastest-growing interstate
natural gas pipeline system, is a wholly owned subsidiary of Williams
Partners L.P. (NYSE: WPZ), of which Williams owns approximately 74
percent, including the general-partner interest.

Williams Partners has executed precedent agreements with utility and
local distribution companies located in Virginia, North Carolina, South
Carolina and Georgia for firm transportation service under the project.
Once complete, the project will help meet the growing natural gas demand
in the Southeast, as well as provide access to new sources of domestic
natural gas supply while enhancing system reliability.

“Southeastern Trail is a critical project that will work to bring key
supplies from interconnects in the Mid-Atlantic region to growing demand
centers in the Southeastern U.S.,” said Micheal Dunn, chief operating
officer of Williams Partners’ general partner. “This vital project,
along with additional expansion opportunities under development, will
link low-cost supply to key customers in high-growth markets and
continues the expansion of southbound capacity on the Transco pipeline
system. Construction of this project along Transco’s existing corridor
results in significantly less environmental impact and more economical
transportation rates for our customers than other greenfield projects
serving these same markets.”

The company held an open season for the project last summer and executed
long-term binding precedent agreements with five natural gas shippers
for 100 percent of the firm transportation capacity. Customers served by
the project are PSNC Energy, South Carolina Electric & Gas, Virginia
Natural Gas, the City of Buford, Ga., and the City of LaGrange, Ga.

Subject to approval by the Federal Energy Regulatory Commission, the
Southeastern Trail Expansion project will consist of approximately 7.7
miles of 42-inch pipeline looping facilities in Virginia, horsepower
additions at existing compressor stations in Virginia, and piping and
valve modifications on other existing facilities in South Carolina,
Georgia, and Louisiana to allow for bi-directional flow.

The certificate application reflects an expected capital cost of $404.8
million and a target in-service commitment of Nov. 1, 2020.

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 reach U.S. markets in 12
Southeast and Atlantic Seaboard states, including major metropolitan
areas in New York, New Jersey and Pennsylvania.

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 (NYSE: 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.

Contacts

Williams Partners L.P.
Media Contact:
Christopher
Stockton, 713-215-2010
or
Investor Contact:
Brett
Krieg, 918-573-4614