© 2013 The Williams Companies, Inc. All rights reserved. 1

Transcontinental Gas Pipe Line Company, LLC Gas-Electric Partnership Conference February 6, 2014 Reverse Flow Expansion Projects Presented by James P. Corley, Business Development Lead

© 2013 The Williams Companies, Inc. All rights reserved. 2

Mobile Bay South III

85

> Provides additional firm southbound capacity on Mobile Bay line. – Begins at Station 85. – Extends as far south as the interconnection

with FGT at Citronelle. > Shippers are Southern Company for 200 MDth/d

and PowerSouth for 25 MDth/d. > Capacity: 225 MDth/d.

– Three MB expansions total 858 MDth/d of southward flow.

> Target in-service date: 2nd Qtr 2015.

83

Citronelle M&R

S S

Bay Gas Storage Southern Pines Storage

Compression & modifications

Compression

Expand meter station

© 2013 The Williams Companies, Inc. All rights reserved. 3

Virginia Southside Expansion

Zone 5

Zone 6

Washington, D.C.

Richmond

165 167

175

185

195

160

200 210 Philadelphia

New York

Brunswick

Cascade Creek

> Expansion from Transco’s Zone 6 Station 210 Pooling Point to Transco’s Cascade Creek, Pleasant Hill and proposed Brunswick delivery meters on the South Virginia Lateral.

> Shippers are Dominion Virginia Power for 250 MDth/d and Piedmont Natural Gas Company for 20 MDth/d.

> Capacity: 270 MDth/d.

> Target in-service date: September 1, 2015.

Pleasant Hill

© 2013 The Williams Companies, Inc. All rights reserved. 4

Leidy Southeast

> Expansion of Transco’s system from various receipt points along the Leidy Line to east coast markets as far south on the mainline as Station 85 in Choctaw County, AL.

> 525 MDth/d of firm transportation on 2 firm paths. > Provides access to markets in Zones 6, 5 and 4. > Target in-service date is December 1, 2015.

Station 520 PathStation 517 PathZone 6Zone 5Zone 4

Project Shippers: Dth/d > Capitol Energy Ventures Corp. 20,000 > Anadarko Energy Services Company 50,000 > MMGS Inc. 50,000 > Piedmont Natural Gas Company 100,000 > Public Service Company of North Carolina, Inc. 100,000 > South Carolina Electric & Gas Company 40,000 > Washington Gas Light Company 165,000

© 2013 The Williams Companies, Inc. All rights reserved. 5

Rock Springs Rock Springs > Expansion of Transco’s Mainline from Station 210 to a new delivery

point at the terminus of a new 10.7-mile lateral to serve Old Dominion Electric Cooperative’s proposed 1,000 MW power plant in Cecil County, MD.

> Service will be provided under Transco’s FT Service. > Facilities: 10.7 mi. of 20-inch; compression. > Capacity: 192 MDthd. > ISD: August 1, 2016.

210

195 Rock Springs

© 2013 The Williams Companies, Inc. All rights reserved. 6

Atlantic Sunrise

Zone 5

Zone 4

Zone 6 195

85

> Expansion of Transco’s Leidy Line to Mid-Atlantic and Southeast Markets.

> 450 – 1,000+ MDth/d of firm transportation.

> Provides access to markets in Zones 6, 5 and 4.

> Target in-service date is July 1, 2017.

© 2013 The Williams Companies, Inc. All rights reserved. 7

Dalton Expansion

210

165

150

140

125 115

195

Zone 4

Zone 5

Zone 6

NC

NJ

PA

DE

MD

VA

GA

SC 130

160

> Expansion from Transco’s Station 210 to interconnections in northern Georgia.

> Facilities include compression, pipe and new interconnections and mainline modifications.

> Capacity: Up to 500 MDth/d. > Estimated In-service date: TBD.

© 2013 The Williams Companies, Inc. All rights reserved. 8

Gulf Coast Market Development

85

65

45

30

Zone 2

Zone 3

Zone 4

Golden Pass LNG

Freeport LNG

Sabine Pass LNG

Cameron LNG

Sasol GTL

Trunkline LNG MS River Industrials Steel, Fertilizer, Methanol, etc.

> Low gas prices and abundant supply (Marcellus displacement) is attracting massive amounts of investment to the hydraulically rich Gulf Coast.

> Upwards of 10 Bcf of incremental demand.

> Could be 10% of US demand by 2020.

© 2013 The Williams Companies, Inc. All rights reserved. 9

Transco After Shale Development

Zone 4

Zone 5

Zone 3

Mid-Atlantic markets

Southeast markets

Zone 2

Zone 1

Eagle Ford Shale

Northeast markets

Mid-Continent Shale Barnett, Haynesville,

Woodford, Fayetteville

Florida markets

Gulf Coast Markets

Shale Gas to Transco Flows on Transco? Shale Play Transco Shale Receipts

Marcellus/Utica Shale

85

65 45