Intermountain West Production -- Getting Gas to Market

1. Intermountain West Production-- Getting Gas to Market Jim Cleary El Paso Western Pipelines IPAA Mid-Year Meeting June 14, 2004

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, the ability to implement and achieve objectives in our long-range plan; general economic and weather conditions in geographic regions or markets served by the company and its affiliates; 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. El Paso Western Pipelines Big Horn Powder River Wind River Green River Denver-Julesburg Uinta Piceance Anadarko Raton San Juan Permian WIC CIG EPNG Mojave Cheyenne Plains 3

4. 2003 NPC Study – Rockies Supply % of National Production % of Total Undiscovered Potential Lower 48 Lower 48 Rockies Rockies

5. Intermountain West Projected Gulf Coast Trillion Cubic Feet/Yr. Midcontinent Southwest Northeast West Coast Natural Gas Production Source: Energy Information Administration

6. North American RegionalDemand Growth 1.2 1.3 Bcf/d 5.1 6.2 Western Canada Eastern Canada Maritimes 3.4 4.4 0.2 0.3 1.5 1.7 0.4 0.5 1.9 2.3 2.0 2.7 6.88.9 2.6 3.5 8.7 10.7 6.0 7.4 4.0 4.2 4.2 5.7 1.3 1.6 3.2 4.5 Total* 15.6 15.8 2002 74.2 2013 92.8 1.9 3.0 4.2 8.1 Mexico Includes lease, plant and pipeline fuel *Source: El Paso N.A. Macro Feb 2004

7. Major Supply Changes 17.5 18.7 Western Canada Bcf/d 0.5 1.6 Eastern Canada Rockies 5.3 9.5 Mid- Continent 3.9 3.2 6.2 4.7 San Juan 3.6 3.2 Permian U.S. LNG Imports 15.1 14.3 South Central Total North America* 0.6 11.0 2002* 75.1 2013 93.2 4.1 8.6 Mexico (incl LNG) 14.0 15.1 Gulf of Mexico * Supply does not equal demand due to balancing / storage; estimates Source: El Paso Pipelines N.A. Macro Feb. 2004

8. CIG to Mid-Continent Basis CIG to Topock Basis Pipeline Export Capacity Net Supply for Export Capacity Surplus Northern Rockies Net Export Supply vs. Capacity MMcf/d

9. 2003 Northern Rockies Export CapacityApproximately 4.0 Bcf/d East Trailblazer 850 KMI 400 CIG* 330 Southern Star 180 WBI 210 Total 1,970 210 475 West NWP North 475 NWP South 360 Kern 900 TransColorado 300 Total 2,035 850 Denver 400 330 360 180 900 300 * Excludes capacity from Raton 9

10. Rockies Export Expansions

11. Northern Rockies Supply Forecast Powder River Denver Big Horn Wind River Piceance Uinta Green River Overthrust MMcf/d 2003 to 2010 2,000 MMcf/d High Prior 2003 Forecast Low 1990-2002: Data derived from IHS Energy database 2003: Estimate 2004-2010: El Paso forecast

12. WIC CIG Kern River NNG NGPL ANR PEPL SSC EPNG Expansions On-Going El Paso Expansion Efforts Medicine Bow Expansion WIC Reversal / Extension Salt Lake City Cheyenne Plains Denver Piceance Greensburg Las Vegas Raton Basin Line 1903 Project 12

13. Cheyenne Plains 36-Inch Pipeline

14. Thoughts for the Future Gas is Valuable · · Capacity is Cheap · · Connectivity is Priceless