Wyoming Pipeline Authority Meeting

1. Wyoming PipelineAuthority Meeting Steve Newell CIG Marketing El Paso Western Pipelines Colorado Springs, Colorado Casper, WyomingFebruary 20, 2007

2. Cautionary Statement Regarding Forward-looking Statements This presentation includes forward-looking statements and projections, made in reliance on the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. The company has made every reasonable effort to ensure that the information and assumptions on which these statements and projections are based are current, reasonable, and complete. However, a variety of factors could cause actual results to differ materially from the projections, anticipated results or other expectations expressed in this presentation, including, without limitation, our ability to successfully contract, build and operate the pipeline projects described in this presentation; changes in supply of natural gas; general economic and weather conditions in geographic regions or markets served by El Paso Corporation and its affiliates, or where operations of the company and its affiliates are located; the uncertainties associated with governmental regulation; competition, and other factors described in the company’s (and its affiliates’) Securities and Exchange Commission filings. While the company makes these statements and projections in good faith, neither the company nor its management can guarantee that anticipated future results will be achieved. Reference must be made to those filings for additional important factors that may affect actual results. The company assumes no obligation to publicly update or revise any forward-looking statements made herein or any other forward-looking statements made by the company, whether as a result of new information, future events, or otherwise.

3. Agenda • High Plains Pipeline • High Plains Storage • Medicine Bow Lateral Expansion

4. W Y O M I N G CIG, WIC, and Cheyenne Plains CIG WIC Cheyenne Denver Cheyenne Plains U T A H Colorado Springs Pueblo Greensburg C O L O R A D O N E W M E X I C O T E X A S Amarillo

5. Steady Demand Growth inColorado (including Front Range) Compound Annual Growth Rate 2005 – 2015 1.4% 1.4% 0.4% 1.9% 2.0% Bcf/d Bcf/d Bcf/d Denver CO Total ~1.4% Bcf/d 2005 1.03 2010 1.14 2015 1.18

6. High Plains Pipeline Project • 164 miles of natural gas pipeline • 79 miles of 30” • 85 miles of 24” • 875 MDth/d • Major receipt points • Cheyenne Hub • Young Storage • High Plains Storage • Major delivery points • Hudson • Blue Spruce • Tri-Town • East Denver • Rate • $3.95/Dth incremental recourse reservation rate • 0.15% FL&U

7. High Plains Storage

8. High Plains Pipeline Timing April (est.) FERC Filing Fall Anticipated In-Service • Open Season results are pending January 12 Open Season Commenced 2007 2008 February (est.) FERC Approval to Construct February 12 Open Season Ended

9. High Plains Storage Project • Storage description • Depleted gas reservoir (Totem Field) • 10.7 Bcf gas in place • 7 Bcf of working gas • 3.7 Bcf of base gas • 200 MMcf/d maximum withdrawal rate • 100 MMcf/d maximum injection rate • Rates • $4.6392/Dth monthly reservation based on MDWQ • $0.1325/Dth monthly storage capacity charge based on MAC • $0.0627/Dth injection rate • $0.0627/Dth withdrawal rate • 2.6% storage fuel

10. High Plains Storage Project Timing August (est.) FERC Filing Spring Anticipated In-Service • Open Season results are pending January 16 Open Season Commenced 2007 2008 2009 May (est.) FERC Approval to Construct February 16 Open Season Ended

11. WIC Medicine Bow LateralOpen Season Roland Harris Business Development BUSINESS DEVELOPMENT

12. W Y O M I N G CIG, WIC, and Cheyenne Plains CIG WIC Cheyenne Denver Cheyenne Plains U T A H Colorado Springs Pueblo Greensburg C O L O R A D O N E W M E X I C O T E X A S Amarillo

13. POWDER RIVER BASIN WIC Medicine Bow Lateral Expansion Project Existing Douglas C.S. 21,510 HP New Compression Facilities CIG WIC Medicine Bow Cheyenne C.S.

14. Background • Existing Medicine Bow fully contracted at 1,055 MDth/d • Utilization has ramped from 700/d – 900/d in 2006 • Increasing Powder River production requires an expansion • Compression addition based on Open Season interest • Douglas supply area receipts • Thunder Creek, Fort Union, MIGC, KMI • Cheyenne market area deliveries • CIG, WIC mainline, PSCo, Cheyenne Plains, Trailblazer • REX deliveries with upcoming hub service

15. Timing • Open Season is effective February 15, 2007 to March 9, 2007 • Turnback completed by March 2, 2007 • Concurrent Open Season for “seasonal capacity” • Assess need for expansion • WIC decision anticipated by March 31, 2007 • In-service June 2008 • See Open Season at: • http://cigco.com • Informational Postings • Wyoming Interstate Company • Other • Informational Lookup

16. Terms and Conditions • Rate is $0.1434/Dth (current maximum recourse rate) • Term is 7 years • Existing shippers may extend contract • Minimum volume requirement for expansions is 160 MDth/d • WIC Medicine Bow Lateral General Terms & Conditions • 1,015 psig at Douglas • 950 Btu • WIC FL&U of 0.56%

17. Tom Dobson 719-520-4606 Tom.Dobson@elpaso.com Roland Harris 719-520-4380 Roland.Harris@elpaso.com Laine Lobban 719-520-4344 Laine.Lobban@elpaso.com Ed Miller 719-520-4305 Edward.Miller@elpaso.com Contacts High Plains Pipeline/Storage Medicine Bow Lateral Expansion Steve Newell 719-520-4341 Steve.Newell@elpaso.com Greg Ruben 719-520-4870 Gregory.Ruben@elpaso.com