1. Wyoming Pipeline Authority August 30, 2005 Gaylen Haag Business Development Questar Pipeline Company

2. In the Heart of the Rockies IDAHO UTAH WYOMING COLORADO Evanston Preston OVERTHRUST 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 Section Western Section Pipeline Kern River Wamsutter Clay Basin

3. Questar Pipeline Expansion Projects

4. 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

5. Overthrust Pipeline Company Proposed 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

6. Overthrust Expansion to Opal Northwest Pipeline Kern QPC Kanda WIC QPC JL90 Blacksfork /Granger Overthrust Pipeline Questar 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 4 th quarter 2007

7. To Midwest Markets NNG, NGPL, Chicago ANR, Vector, Midwestern, Guardian, etc. Wamsutter Pipeline - Extension to Bison Salt Lake City Cheynne Bismarck Montana North Dakota South Dakota Nebraska Colorado Utah Wyoming Gillette Wamsutter Wind River Basin Powder River Basin Bison Pipeline Wamsutter Pipeline Northern Border Pipeline Rock Springs Questar Pipeline System Kern River 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.

8. 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

9. 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

10. 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

11. 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 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