1. D E P E N D A B L E N A T U R A L G A S www.elpaso.com | NYSE:EP Customer Webex September 6, 2011

2. Review Maintenance Information Postings Review of Upcoming Outages September & October 2011 Gulf Coast Central Northern Other major 2011 outages Q&A

3. Anticipated Impacts are estimates. Actual nominations, market demand, weather and pipeline conditions, etc. will determine if, and through what level, restrictions become necessary. Unless otherwise stated, all scheduled dates represent gas days as defined in the Tennessee Gas Pipeline tariff to mean a period of twenty-four consecutive hours, beginning and ending at 9:00 a.m. (Central Clock Time).

4. Scheduled dates are subject to change. Projects may be added, altered, delayed or cancelled. TGP will provide notice of such additions or changes via PASSKEY postings. Dates as posted on PASSKEY should be deemed correct in the event of conflicts between PASSKEY posted dates and dates within this presentation.

5. What reports are out there (and what do they mean to me)? Where can I find them? How can I have Passkey work for me? (subscriptions)

6. TGP Scheduled Outages Updated as of:08/26/11 Tennessee Gas Pipeline 2011 Pipeline Outage and Maintenance Summary This is a summary of the current status of all TGP 2011 Pipeline Outages and Maintenance Projects. This document is subject to change as the season progresses to reflect the updated status of all outages and maintenance projects including, but not limited to, project delays, cancellations and additions. Additionally, anticipated impact and restrictions are subject to change. *Unless otherwise noted, all scheduled dates represent gas days as defined in the Tennessee Gas Pipeline tariff to mean a period of twenty-four consecutive hours, beginning and ending at 9:00 a.m. (Central Clock Time). * Indicates revision Revised Start Date End Date Prev. Start Date Prev. End Date LocationLegZone Maintenance Activity Anticipated Impact Potential Restric-tion Level TOS Potential Restrictions Meter(s) in impacted area 09/12/1 1 09/16/11 Station 3233004 Electrical maintenance; ESD Test. These activities will require a Station outage, and based upon customer nominations restrictions may become necessary. SOP Potential restrictions through a pro-rata portion of Secondary Out of Path (Loan, Park Withdrawal, IT-X, IT, AOT, PAT, Payback From Tennessee, EDS/ERS, SOP) nominations pathed through Station 323. *** 09/12/1 1 09/17/1109/04/1109/13/11 MLV 307-2 to MLV 308-2 3004Install launcher. Physical flow will be suspended at meter 020449 HIGHLAND PENNSYLVANIA for the duration of this project. No additional service impact is anticipated. MTR 020449 HIGHLAND PENNSYLVANIA

19. Questions about maintenance reports and subscriptions?

20. Green No Impact Anticipated Yellow Restrictions are possible, but not likely. With extended duration, restrictions could be necessary from time to time. Red Restrictions are probable, OR Meter(s) affected, OR Combination of the above.

21. MLV 7-2 to 9-2 Emergent Anomaly 7/19 to 12/31 Line 823X-1300 Line abandonment (M) 8/22 to 9/11 MLV 21-3A to 22-3 Line lowering (M) 8/18 to 9/21 Anomaly remediations MLV 46-1 to 47-1 - 9/16 to 9/17 MLV 45-1 to 46-1 - 9/12 to 9/15 MLV 44-1 to 45-1 - 9/6 to 9/9 MLV 42-1 to 43-1 - 9/1 to 9/11 MLV 41-1A to 41-1 - 9/19 to 9/23 MLV 20 to MLV 21 (all three lines) - Line lowering 9/10 to 10/15 Station 823 (~4 hours) ESD Test 9/13 Unit testing 9/13 to 9/16 509A-2900 Line abandonment (M) 9/15 to 9/18 Anomaly remediations MLV 539-1 to 540-1 - 9/24 to 10/5 MLV 538-2 to 539-2 - 9/17 to 9/24 MLV 537-2 to 538-2 - 9/6 to 9/17 MLV 536-2 to 537-2 - 9/15 to 9/24 Vermilion 245 Filter separator installation 9/19 to 9/30 Line 21B-100 (Tomball Line) Hydrostatic test. (M) 9/20 to 9/30 Sta 823 to MLV 516 Maintenance pigging (M) 9/20 Station 827 Peco filter change 9/22 527A-2400 (SP 57 to SP 77) Line abandonment (M) 9/8 to 9/11

22. MLV 200-4 to 202-4 Anomaly remediation 7/5 to 10/7 Station 47 Unit 1E compressor cleaning 9/12 to 9/18 MLV 562-2 to 565-2 Emergent anomaly 7/27 to 11/1 Anomaly remediations MLV 79-1 to 82-1 - 9/12 to 10/15 MLV 82-3C to 86-3 - 7/13 to 9/30 MLV 83-1 to 85-1 - 8/19 to 9/12 MLV 867-2 to 871-2 Anomaly remediation 8/19 to 9/13 MLV 63-4 to 64-4 Hydrostatic test 8/22 to 9/23 MLV 555-1 to 559-1 Anomaly remediation 8/30 to 9/24 MLV 78-3 to 79-3 Install pig launchers, pipe and mainline valves. 9/6 to 9/24 Station 200 ESD test 9/13 to 9/14 Station 47 B &C Bldg(1 at a time) BPS removal 9/27 to 9/29 Station 54 Substation maintenance 9/27 to 9/30 MLV 550-1 to 552-1 Anomaly remediation (M) 9/24 to 10/15

23. Station 315 HP replacement 3/9 to 9/15 Anomaly Remediations MLV 245-1 to 246-1 - 9/19 to 9/30 MLV 246-1 to 247-1 - 8/8 to 9/9 MLV 259-1 to 260-1 - 9/12 to 9/23 Emergent Anomaly Remediations MLV 208-1 to 209-1 - 8/24 to 9/16 MLV 207-1 to 208-1 - 9/10 to 9/15 MLV 213-1 to 214-1 - 9/10 to 9/15 MLV 312-2 to 313-2 Install receiver (M) 8/25 to 9/9 Station 249 Unit 2A maintenance 9/26 to 9/30 Unit 1B maintenanceb9/6 to 9/8 Unit 2B maintenance 9/16 to 9/16 Station 313 Unit work - 9/6 to 9/22 Tie in gas cooler/filter separator 9/13 to 9/15 Station 241 Unit 1A install catalyst 9/8 to 9/24 MLV 307-2 to 308-2 Install launcher (M) 9/9 to 9/15 Station 405A Unit maintenance 9/9 to 9/11 Station 245 Fuel modifications 9/10 Unit work 9/20 to 9/22 Station 266 (Mendon) Unit 1B overhaul 9/12 to 9/16 Station 323 Electric maintenance/ESD Test 9/12 to 9/16 Station 224 ESD Test 9/13 Units 1A-4A maintenance 9/19 to 9/23 MLV 334-1 to 336-1 Pipe relocation (M) 9/13 to 9/19 Station 313 A bldg controls 9/19 to 9/26 300 Line Expansion Tie-ins MLV 315-2 to 315A-102 - 9/19 to 9/25 MLV 317-AD2 to 317A-101 - 9/19 to 9/26 MLV 321-2 to 321-101 - 9/20 to 9/26 MLV 313A-400 to 313A-405 (HC Line) Anomaly remediation 9/20 to 9/30 Line 264B-101 (Spencer) Anomaly remediation 9/26 to 10/1 Line 273B-101 Haverhill Lateral - Anomaly remediation 9/26 to 10/1/11 Station 237 ESD Test 9/27 Station 319 ESD test (1 day) 9/28 to 10/7 Line 261B-100 (Springfield ) Hydrostatic test (M) 9/29 to 10/3 MLV 211-1 to 212-1 Emergent Anomaly (M) 9/10 to 9/15 Station 229 ESD Test. 9/15

24. MLV 25-2 to 27-2 Hydrostatic test 10/4 to 10/31 Station 40 - Unit 500 C1 Unit inspection 10/3 to 10/6 Branch line inspections (M) MLV 33-1 to 34-1 - 10/4 to 10/7 MLV 26-1 to 27-1 - 10/10 to 10/13 MLV 19-1 to 20-1 - 10/17 to 10/21 MLV 15-1 to 16-1 - 10/24 to 10/27 MLV 14-1 to 15-1 - 10/28 to 11/2 MLV 16-3 to 17-3 Relocate pig receiver 10/6 to 10/24 Bluewater—System Pecan Island to Cocodrie Pigging operations. 10/18 to 10/23 MLV 539-1 to 540-1 Anomaly remediation 9/24 to 10/5 MLV 41-1 to 42-1 Anomaly remediation (M) 10/4 to 10/22 Bear Creek Storage Fall shut in test. 10/18 to 10/24 Station 1 ESD Test. 10/27 MLV 32-3 to 34-3 Hydrostatic test (M) 10/4 to 10/31

25. MLV 834-1 to 835-1 ILI pigging operations 10/17 to 10/18 MLV 63-1 to 69-1 ILI pigging operations 10/20 to 10/22 Station 96 MCC replacement 10/3 to 10/14 MLV 200-4 to 202-4 Anomaly remediation 7/5 to 10/7 Anomaly Remediations MLV 550-2 to 554-2 - 10/15 to 10/24 MLV 540-1 to 541-1 - 10/12 to 10/26 MLV 540-2 to 541-2 - 10/26 to 11/3 MLV 110-2 to 114-2 ILI pigging operations 10/5 Station 200 MCC replacement 10/17 to 10/31 MLV 100-4 to 101-4 Pipe replacement 10/22 to 11/4 Station 843 Yard welding 10/26 to 10/27 MLV 550-1 to 552-1 Anomaly remediation (M) 9/24 to 10/15 Anomaly remediations (M) MLV 540-2 to 541-2 - 10/26 to 11/3 MLV 539-2 to 540-2 - 10/5 to 10/12

26. Station 241 3A Unit maintenance 9/26 to 10/7 B Unit maintenance 10/10 to 10/15 Line 217A (Pittsburg Spur) ILI pigging operation 10/1 MLV 313A-405 to 410 (HC Line) - Anomaly remediation 10/1 to 10/7 Meter 020914 (Sabinsville) Meter upgrade 10/1 to 10/16 Station 265E Replace BPS system (M) 10/3 to 10/7 Fall shut in test. Harrison Storage - 10/3 to 10/7 Hebron/Ellisburg Storage 10/24 to 10/28 300 Line Expansion Tie-ins MLV 325-2 to 325D-101 - 10/3 to 10/20 MLV 320-2L to 320-2A - 10/13 to 10/21 MLV 314A-101 to 315-2 - 10/9 to 10/23 Line 265E-100 (RI) ILI pigging operation 10/4 Station 266 ESD Test 10/4 to 10/5 MLV 213-3 to 214-3 Hydrostatic test. 10/10 to 10/21 MLV 237-1 to 245-1 Efficiency pigging. 10/11 MLV 270B-101.1 to 270B-105 ILI pigging (M) 10/11 to 10/13 MLV 318-1 to 319-1, 320-1 to 321-1, and 322-1 to 323-1 Anomaly remediations (M) 10/18 to 10/28

27. 27 MLV 314 Meters in the MLV 318-1 to 319-1 valve section: 012823 ELLIOTT DEHY: RIP 318 101.1 012769 EVANCHICK DEHY: RIP 318C 101.1 020652 WYALUSING SALES Station 315 Station 317 Station 325 Station 313 MLV 316 MLV 318 MLV 320 MLV 324 MLV 322 Meters in the MLV 320-1 to 321-1 valve section: 012751 HOP BOTTOM DEHYD: RIP 320C 101.1 012841 AUBURN DEHYDRATION: RIP 320-1 0.04 012782 LOTT DEHYDRATION: RIP 320D 101.1A 012778 TEEL DEHYDRATION: RIP 320H 101.1A 012825 STRICKLAND HILL DEHY: RIP 320K 101.1 012793 SPRINGVILLE DEHY: RIP 320I 101.1 012821 DIMOCK DEHY: RIP 320J 101.1 012794 KORBAN DEHY:RIP 320E 101.1 Meters in the MLV 322-1 to 323-1 valve section: 020277 HONESDALE PENNSYLVANIA SALES Station 319 Station 321 Station 323 Reduced operating pressures by 20% MLV 318-1 to 319-1, 320-1 to 321-1, and 322-1 to 323-1 Anomaly remediations (M) 10/18 to 10/28 Station 315 Station 323 Station 325 Station 313

28. 28 Station 40 MLV 707 MLV 706 MLV 705 MLV 704 MLV 703 MLV 702 MLV 701 MLV 700 012688 PANOLA TRANSPORT 2 012033 CARTHAGE TRANSPORT 012141 CARTHAGE GAS UNIT 13 (Bi 2 0723 020723 CARTHAGE GAS UNIT 13 (Bi 1 2141) 010031 EAST TEXAS PLANT DEHYDRATION 011200 ENTEX PANOLA TRANSPORT (CI) 011525 BELLE BOWER DEHYDRATION 012764 STATE LINE PROCESSING: RIP 704F 012807 LOGANSPORT B: RIP 704H 101.1A 012759 BURFORD GATHERING: RIP 704 E 101.1 012081 BETHANY LONGSTREET FIELD 012026 GRAND CANE 012706 LOGANSPORT 011327 SPIDER DEHYDRATION 012725 DE SOTO GATHERING 012607 DESOTO HOLLY FIELD 012583 BENSON AND CONVERSE 012814 BLACKSTONE NO 1: RIP 703K 101.1 011442 NABORTON DEHYD D N BELL 1 (CI) 012775 TRENTON SALES: RIP 703H 1 5.38 012765 HARRIS 19.1: RIP 703G 101.1 012736 MARTIN TIMBER (CO) 012610 WEST MANSFIELD 020628 PLEASANT HILL TRANSPORT (CI) 012786 BLACKSTONE IVORY: RIP 702M 101.1 011668 BRUSHY BAYOU FIELD 011755 GROGAN FIELD (CI) 011330 CHEMARD LAKE DEHYDRATION 011590 GROGAN FIELD (CI) 011598 SAN MIGUEL CREEK FIELD (CI) 011143 GROGAN DEHYDRATION TRANSPORT (CI) Pipe replacement in Station 40 yard. 11/1-11/3 Impact: Carthage Lateral shut in at Station 40. -Physical flow into the Carthage Lateral must match physical flow out of the Carthage Lateral. -All receipt meters between MLV 707 (end of lateral) and MLV 700—at Station 40 would have to shut in or schedule flow to Enterprise meter 020723. Station 703

29. Questions?

30. Suggestions for improvements to this meeting Are the meetings beneficial? Is additional information needed? Questions after the meeting? Other? Email to one of the following: Your scheduler PASSKEY Portal