Steve Newell CIG Marketing El Paso Western Pipelines Colorado Springs, Colorado Casper, Wyoming February 20, 2007 Wyoming Pipeline Authority Meeting

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 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 companys (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 PipelineHigh Plains Pipeline High Plains StorageHigh Plains Storage Medicine Bow Lateral ExpansionMedicine Bow Lateral Expansion

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

5 Steady Demand Growth in Colorado (including Front Range) Compound Annual Growth Rate 2005 – % 0.4% 1.9% 2.0% Bcf/d CO Total ~1.4%Bcf/d CO Total ~1.4%Bcf/d Denver Bcf/d

6 High Plains Pipeline Project 164 miles of natural gas pipeline164 miles of natural gas pipeline 79 miles of 3079 miles of miles of 2485 miles of MDth/d875 MDth/d Major receipt pointsMajor receipt points Cheyenne HubCheyenne Hub Young StorageYoung Storage High Plains StorageHigh Plains Storage Major delivery pointsMajor delivery points HudsonHudson Blue SpruceBlue Spruce Tri-TownTri-Town East DenverEast Denver RateRate $3.95/Dth incremental recourse reservation rate$3.95/Dth incremental recourse reservation rate 0.15% FL&U0.15% FL&U

7 High Plains Storage

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

9 High Plains Storage Project Storage descriptionStorage description Depleted gas reservoir (Totem Field)Depleted gas reservoir (Totem Field) 10.7 Bcf gas in place10.7 Bcf gas in place 7 Bcf of working gas7 Bcf of working gas 3.7 Bcf of base gas3.7 Bcf of base gas 200 MMcf/d maximum withdrawal rate200 MMcf/d maximum withdrawal rate 100 MMcf/d maximum injection rate100 MMcf/d maximum injection rate RatesRates $4.6392/Dth monthly reservation based on MDWQ$4.6392/Dth monthly reservation based on MDWQ $0.1325/Dth monthly storage capacity charge based on MAC$0.1325/Dth monthly storage capacity charge based on MAC $0.0627/Dth injection rate$0.0627/Dth injection rate $0.0627/Dth withdrawal rate$0.0627/Dth withdrawal rate 2.6% storage fuel2.6% storage fuel

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

Roland Harris Business Development WIC Medicine Bow Lateral Open Season BUSINESS DEVELOPMENT

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

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

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

15 Timing Open Season is effective February 15, 2007 to March 9, 2007Open Season is effective February 15, 2007 to March 9, 2007 Turnback completed by March 2, 2007Turnback completed by March 2, 2007 Concurrent Open Season for seasonal capacityConcurrent Open Season for seasonal capacity Assess need for expansionAssess need for expansion WIC decision anticipated by March 31, 2007WIC decision anticipated by March 31, 2007 In-service June 2008In-service June 2008 See Open Season at:See Open Season at: Informational PostingsInformational Postings Wyoming Interstate CompanyWyoming Interstate Company OtherOther Informational LookupInformational Lookup

16 Terms and Conditions Rate is $0.1434/Dth (current maximum recourse rate)Rate is $0.1434/Dth (current maximum recourse rate) Term is 7 yearsTerm is 7 years Existing shippers may extend contractExisting shippers may extend contract Minimum volume requirement for expansions is 160 MDth/dMinimum volume requirement for expansions is 160 MDth/d WIC Medicine Bow Lateral General Terms & ConditionsWIC Medicine Bow Lateral General Terms & Conditions 1,015 psig at Douglas1,015 psig at Douglas 950 Btu950 Btu WIC FL&U of 0.56%WIC FL&U of 0.56%

17 Contacts Tom Dobson Roland Harris Laine Lobban Ed Miller Steve Newell Greg Ruben High Plains Pipeline/StorageMedicine Bow Lateral Expansion