El Paso Corporation Nominations and Scheduling Customer Advisory Group Update May 14, 2009 Colorado Interstate Gas Company Wyoming Interstate Company Cheyenne Plains Gas Pipeline Company

Agenda Completed items Transactional Tracking Project Status Head Station Pool Enhancement Plan EBB Enhancement Project Status Outstanding Issues to Discuss WestPipe Connect Status Other Items  Data Center move  Next call 2

The Process for Enhancements Communication (1) Prioritization (2) Tracking and Execution (3) (a)Gathering and under- standing customer requests (b) Reporting timelines and status In-depth analysis, specifications, development, testing, training, etc. Getting customer priorities and evaluating available and needed resources 3

Completed NAS Items Completed DateComments Auto-population of C/O column in Location Pools2/24/2009See Notice #7596 Display associated constraint point with Pipeline reductions in the Shipper nomination tracking screen 2/18/2009See Notice #7590 Allow customers the option to hide transactions with zero quantities on the Location Pooling Confirmations screen. 2/18/2009See Notice #7590 Added Location Pool Monitoring Report to help identify mismatches before deadline11/25/2008See Notices #7457 and #7460 Replaced Pooler reduction reason codes POM (Market Reduction) and POS (Supply Reduction) with PRR (Confirming Party Reduction at the Receipt) and PRD (Confirming Party Reduction at the Delivery). 10/28/2008See Notice #7388 Replaced the Shipper reduction reason code UPD (Update) with RVL(Re-evaluate) on the Shipper tracking screens. 10/21/2008See Notice #7365 Added Location Pool screen enhancements and Pool tracking screens10/14/2008See Notice #7328 Replaced reduction reason code ICM with HRY (Hourly Service Entitlement Reduction).7/9/2008See Notice #7208 Introduced new CIG, WIC and CP web portal pages.6/20/2008See Notice #7189 Highlights of Nominations and Scheduling Changes Completed in the last 12 months Current list of requested changes posted on our website Informational Postings > Other > Informational Look up > Customer Initiative 4

Transactional Tracking – Completed Items Phase I – completed November 2008 Phase 2 – completed in March 2009  Added PRR and PRD Reduction Reason Codes to Location Pool Tracking  PRR: Confirming Party Reduction at the Receipt Location  PRD: Confirming Party Reduction at the Delivery Location  Added tracking of ADD to nominations which span a date range  Added point of constraint to nominations tracking Feedback? 5

Transactional Tracking - EPSQ in Pools This project is to address problems which cause pools to be scheduled below EPSQ (Elapsed Pro Rated Scheduled Quantity) Four development phases Each phase will be implemented independently 6

EPSQ in Pools - Breakdown by Phase Phase 1 – will prevent poolers from reducing their nomination/confirmation below EPSQ in Cycles 3 and 4  In test for June 2009 Phase 2 – will prevent pools from being scheduled below EPSQ due to CBL (Contract Balancing) or CPR (Confirming Party Reduction – used in pools) reduction reason codes  In development for 3Q 2009 Phase 3 – will prevent capacity reductions from taking pool transactions below EPSQ  To follow phase 2 Phase 4 – will prevent underconfirmations by operators from reducing pool transactions below EPSQ  To follow phase 3 All phases anticipated to be implemented in

Headstation Pool Enhancement Plan (Requests #4, 5, 10, 29) Development planned to begin after Phase 4 EPSQ Redesign main screen for ease of use and improved functionality Add features which will allow poolers to perform all necessary tasks from the pooling screen Add Status screens and Tracking for both Supply and Market sides of the pool Add the following reduction reason codes to Headstation Pool Tracking:  PRR: Confirming Party Reduction at the Receipt Location  PRD: Confirming Party Reduction at the Delivery Location  CBL: Contract Balancing  CPR: Confirming Party Reduction – Pools  PCC: Pipeline Capacity Constraint 8

EBB Web Site Enhancement Project Status Many enhancements planned  Improved look and feel  Column sorting, dragging, pinning, filtering  Enhanced query and download features Phased migration  Phase 1 (June 2009): Index of Customers, Operationally Available Capacity, Notices  Phase 2 (August 2009): Transactional Reports, Storage Field Inventory  Phase 3 (October 2009): Unsubscribed Capacity (From Pipelines, From Expiring Contracts), Gas Quality  Phase 4 (November 2009): Posted Imbalances 9

Outstanding Issues to Discuss Proposal to take no further action on:  Allow CIG Schedulers to correct mismatched nominations after the nomination deadline  Add process to auto-populate DUNS numbers associated with upstream and downstream contracts Proposal to proceed with:  Adding reduction reason codes to the Location Pool Balancing report and the Contract Routes report Provide analysis for:  New items identified at November meeting with Customer Advisory Group  Recommendations in next concall for implementation or delay to new Xpress system 10

WestPipe Connect Status Launched Fall 2008 with the goal of completely rewriting Xpress by September 2011 Phased approach  System framework (in development)  Customer needs and preferences are at the forefront of the new design  Security system (in test)  Allocations system – customer access (June/July 2009)  Remainder of 2009 focused on necessary internal framework  Remaining core systems (2010 and 2011)  Contracts, Nominations, Scheduling, Invoicing Additional customer input during the rewrite is invaluable Select enhancements being made to the existing Xpress system are to help customers until the new system is complete 11

Additional items Data Center moves  Planned for May 2009  Interfaces to EDI – May 19 (1:30 am to 4:30 am MCT)  Xpress Data Warehouse – May 21 (1:30 am to 4:30 am MCT)  Xpress – May 27 (1:30 am to 4:30 am MCT) Next call  August 13, 2009, at 1:30 pm MCT 12