D E P E N D A B L E N A T U R A L G A S | NYSE:EP Customer Webex October 5, 2011

Review of Upcoming Outages October & Winter 2011 Gulf Coast Central Northern Q&A

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).

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.

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.

Branch line inspection (M) MLV 33-1 to /18 to 10/20 MLV 26-1 to /11 to 10/13 MLV 19-1 to /3 to 10/8 MLV 14-1 to /24 to 11/2 Station 703 Repair seal 10/4 to 10/6 Station 40 Unit 500 C1 Unit inspection 10/10 to 10/13 MLV to Cleaning/Caliper/ILI pigging 10/10 to 10/13 523M-7300 and 523M-7600 Line abandonment (M) 10/4 to 10/15 Anomaly remediation MLV 41-1 to 42-1 (M) 10/3 to 10/12 MLV 45-1 to /7 to 10/14 MLV 43A-100 to A Maintenance pigging (M) 10/12 Station 827 Peco filter change 10/12 to 10/14 Vermilion 245 Vent stack/filter separator installation 10/1 to 10/15 MLV 20 to 21 (all three lines) Line lowering 9/10 to 10/17 Station 409 Unit 1A Maintenance 10/17 Maintenance Pigging St 823 to St 40 10/20 St 823 to St /20 BluewaterSystem Pigging operations 10/18 to 10/23 MLV 16-3 to 17-3 Relocate pig receiver 10/6 to 10/24 Bear Creek Storage Fall shut in test. 10/18 to 10/24 Station 1 ESD Test 10/27 MLV 9-1 to 11-1 Maintenance pigging 10/27 Hydrostatic test MLV 25-2 to /4 to 10/31 MLV 32-3 to /4 to 10/31 MLV 21-3A to 22-3 Line lowering (M) 8/18 to 11/1 MLV 7-2 to 9-2 Emergent anomaly 7/19 to 12/31 Maintenance pigging 409A-1100 (Rio Bravo) 11/1 409A-100 (Pemex) 10/27

Anomaly remediation MLV to (M) 9/20 to 10/5 MLV to (M) 10/26 to 10/29 MLV to (M) 10/5 to 10/12 Station 96 MCC replacement 10/3 to 10/14 Anomaly remediation MLV to /24 to 11/18 MLV to /12 to 10/26 MLV to /19 to 10/7 MLV to ILI pigging10/13 MLV to Anomaly remediation 10/3 to 10/14 Anomaly remediation MLV 83-1 to /5 to 10/20 MLV 80-1 to /17 to 11/8 MLV to Emergent anomaly 7/27 to 10/21 Station 87 E Bldg outage 10/17 to 10/21 MLV to Cleaning/Caliper/ILI pigging 10/17 to 10/27 Station 843 Yard welding 10/26 to 10/27 Station 200 MCC replacement 10/17 to 10/31 MLV to Pipe replacement 10/22 to 11/4 MLV 200-4B to Valve replacements 10/24 to 12/2 MLV 40-2 to 47-2 Pipeline Outage 4/14 to 11/1 (est)

Anomaly remediation MLV 313A-403 to /20 to 10/8 MLV 313A-406 to /3 to 10/5 MLV 313A-410 to /3 to 10/5 300 Line Tie-ins MLV 314A-101 to /17 to 10/20 MLV 317-AD2 to 317A-101 9/26 to 10/5 MLV 320-2L to /17 to 10/20 MLV to /6 to 10/12 MLV to 325D /16 to 10/20 Emergent anomaly MLV to /12 to 10/7 MLV to /24 to 10/5 Station 319 ESD test (1 day) 9/28 to 10/7 Station 265E Replace BPS system 10/3 to 10/7 Fall shut in test Harrison Storage 10/3 to 10/7 Hebron/Ellisburg 10/24 to 10/28 MLV to Efficiency pigging 10/11 MLV to Cleaning Pig 10/11 Station 245 Unit maintenance 10/3 to 10/13 Station 229 Unit maintenance 10/11 to 10/13 MLV 270B to -105 ILI pigging 10/11 to 10/13 Meter (Union City) Meter modifications (M) 10/12 to 10/13 MLV 270B-105 to -106 ILI pigging 10/110to 10/14 Station 241 B Unit maintenance 10/10 to 10/15 Unit 3A maintenance 10/16 to 10/28 Meter (Sabinsville) Meter upgrade (M) 10/1 to 10/16 Station 313 Unit maintenance 9/6 to 10/20 Station 270B ESD Test 10/25 to 10/26 Anomaly remediations MLV to MLV to MLV to /18 to 10/28 MLV to Pipe relocation (M) 10/24 to 10/31 MLV to Hydrostatic test 10/24 to 11/4 MLV and Concord Lateral Emergent anomaly 9/13-11/1 Pipeline Outage MLV to /1 to 11/1 (est) MLV to /1 to 11/1 (est)

Efficiency pigging MLV 32-1 to 40-1 (M) 11/8 MLV 32-3 to 40-3 (M) 11/9 MLV 17-1 to 9-1 Maintenance pigging 11/16 Branch line inspection (M) MLV 14-1 to /24 to 11/2 MLV 15-1 to /8 to 11/10 MLV 3-1 to /14 to 12/3 Carthage St 40 Pipe replacement 11/1 to 11/3 Station 703 Unit maintenance 11/1 to 11/3 Station 527 MCC replacement 11/7 MLV to Maintenance Pigging 11/7 to 11/12 MLV to Anomaly remediation (M) 11/11 to 11/14 Line 21B-100 (Tomball Line) Hydrostatic test (M) 12/1 to 12/20 MLV to Anomaly remediation 10/24 to 11/18

Anomaly remediation MLV to /28 to 12/2 MLV to /4 to 11/18 MLV to /28 to 12/5 MLV to /15 to 11/18 MLV 40-2 to 47-2 Pipeline Outage 4/14 to 11/1 (est) MLV 80-1 to 82-1 Anomaly remediation 10/17 to 11/8 MLV to Pipe replacement 10/22 to 11/4 MLV 200-4B to Valve replacements 10/24 to 12/2

MLV 260A-100 (Northampton) Cleaning Pig 11/8 to 11/9 Station 319 Emissions Testing 11/28 to 12/2 Line 217A (Pittsburg Spur) Cleaning and ILI pigging 12/1 Station 315 Crane Install 11/8/ to11/10 Pipeline Outage MLV to /1 to 11/1 (est) MLV to /1 to 11/1 (est) MLV and Concord Lateral Emergent anomaly 9/13-11/1

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

13 Station 40 MLV 707 MLV 706 MLV 705 MLV 704 MLV 703 MLV 702 MLV 701 MLV PANOLA TRANSPORT CARTHAGE TRANSPORT CARTHAGE GAS UNIT 13 (Bi CARTHAGE GAS UNIT 13 (Bi ) EAST TEXAS PLANT DEHYDRATION ENTEX PANOLA TRANSPORT (CI) BELLE BOWER DEHYDRATION STATE LINE PROCESSING: RIP 704F LOGANSPORT B: RIP 704H 101.1A BURFORD GATHERING: RIP 704 E BETHANY LONGSTREET FIELD GRAND CANE LOGANSPORT SPIDER DEHYDRATION DE SOTO GATHERING DESOTO HOLLY FIELD BENSON AND CONVERSE BLACKSTONE NO 1: RIP 703K NABORTON DEHYD D N BELL 1 (CI) TRENTON SALES: RIP 703H HARRIS 19.1: RIP 703G MARTIN TIMBER (CO) WEST MANSFIELD PLEASANT HILL TRANSPORT (CI) BLACKSTONE IVORY: RIP 702M BRUSHY BAYOU FIELD GROGAN FIELD (CI) CHEMARD LAKE DEHYDRATION GROGAN FIELD (CI) SAN MIGUEL CREEK FIELD (CI) 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 700at Station 40 would have to shut in or schedule flow to Enterprise meter Station 703

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