Wyoming Pipeline Authority

August 30, 2005

Gaylen HaagBusiness DevelopmentQuestar Pipeline Company

In the Heart ofthe Rockies

IDAHO

UTAH

WYOMING

COLORADO

Evanston

PrestonOVERTHRUST

GREEN RIVER

UINTA

Rock Springs

SKULL CREEK

SAND WASH

PICEANCE

SAN JUAN

PARADOX

Long Beach

NEVADA

CALIFORNIA

Principal producing basins

Questar Pipeline system

Questar Gas system

Questar Gas cities served

Salt Lake City

TransColorado

Questar Pipeline

Southern Trails

Overthrust

Eastern SectionWestern Section

Pipeline

Kern River

WamsutterClay Basin

Questar Pipeline Expansion Projects

New Expansion Projects

Overthrust Pipeline Tie to Kern’s Painter Lateral Overthrust Pipeline Expansion to Opal Extension to Bison Pipeline Storage Projects

Rock Springs Southwest Wyoming Salt Cavern Storage

Southern System Expansions to Goshen Southern System Expansions to Greasewood /

Meeker

Overthrust Pipeline CompanyProposed

Interconnect with Kern at the Painter

Lateral

NPC

Kern

QPC Kanda

WIC

QPC JL90

QPC Eakin Station

Overthrust Pipeline

Questar Pipeline

New interconnect with Kern River’s Painter Lateral

200,000 Dth/day, available January 1, 2006 (Sold out on August. 26.)

Receipt Points: WIC, CIG & QPC @ Kanda, Granger Plant & Clear Creek Storage

Overthrust Expansion to OpalNorthwest Pipeline

Kern

QPC Kanda

WIC

QPC JL90

Blacksfork /Granger

Overthrust PipelineQuestar Pipeline

Opal

Overthrust extension to Opal

500,000 Dth/day expansion to Opal (West)

Deliveries to Northwest Pipeline and Kern River to go west.

500,000 Dth/day from the Opal Plant to Kanda (East)

Deliveries to WIC & CIG @ Kanda to go east.+

Open Season September / October 2005. In service 4th quarter 2007

To Midwest Markets

NNG, NGPL, Chicago

ANR, Vector, Midwestern,

Guardian, etc.

Wamsutter Pipeline - Extension to Bison

Salt Lake City Cheynne

BismarckMontana North Dakota

South Dakota

Nebraska

ColoradoUtah

Wyoming Gillette

Wamsutter

Wind River Basin

Powder River Basin

Bison Pipeline

Wamsutter Pipeline

Northern Border Pipeline

Rock Springs

Questar Pipeline System

Kern

Riv

er

245 mile Pipeline from Wamsutter to Bison Pipeline

500,000 Dth/day

Wamsutter receipts: Gas Plants (ie. Echo Springs), WIC, CIG, Entrega, Southern Star, Wamsutter area gathering, Lost Creek Lateral etc.

Avoids congested routes to Mid-continent.

UTAH

COLORADO

WYOMING

WAMSUTTER

FERRON

GREATER GREEN RIVER

• Potential development of traditional gas storage in the Rock Springs, Wyoming Area

•19 Bcf working gas capacity

•Proposed ties to QPC, CIG, and WIC, at Kanda, Kern via Overthrust and Overland Trail

•Estimated in-service date: Two years after contract commitments

Rock Springs Storage Project

Southwest Wyoming Salt Cavern Storage Project

UTAH

COLORADO

WYOMING

WAMSUTTER

FERRON

GREATER GREEN RIVER

•Near Evanston, Wyoming

•Ultimate capability 12.5 Bcf working gas – initially 5 Bcf

•Potential deliverability of 500 MMcf/day with 5 Bcf of working gas

•Increased interest with additional electrical generation markets

•Interconnects with QPC and Kern River with potential tie to Overthrust Pipeline

Overthrust Pipeline

Ferron

Clay Basin

ML 40

ML 80

ML 59

ML 103/68

Fidlar

Oak Spring

ML 104

Kern River at Goshen

JL 47

Monument Buttes

Divide Creek

Compression Facilities

Current Southern System Expansion Project

Existing Interconnects

CIG101

ML 40/41

Questar Gas

Blind Canyon

Questar Gas

Power Markets

Greasewood

ML 104

Thistle Creek

2005 Southern System Expansion • 18.7-mile extension of ML 104• Two new compressor stations and modification of existing compression• 102,000 Dth/d, fully subscribed• Projected in-service date of Nov. 1, 2005

WYOMING

Ferron

Clay Basin

ML 40

ML 80ML 59

ML 103/68

Fidlar

Oak Spring

ML 104

Kern River at Goshen

JL 47

Monument Buttes

Divide Creek

Compression Facilities

Future Southern System Expansion Options to Goshen

Existing Interconnects

CIG101

ML 40/41

Questar Gas

Blind Canyon

Questar Gas

Power Markets

Option 2: Proposed 65-mile ML 104 extension• 180,000 Dth/d

Greasewood

ML 104

Thistle

Soldier Creek

Option 1: Proposed 38-mile ML 104 extension• 100,000 Dth/d

• $.26 Dth/d rate with 10-year minimum term

• Target Nov. 2007 in-service date with 2005 commitments

WYOMING