NNG Winter Operations 2001 - 2002

1. NNG Winter Operations2001 - 2002 ETS Gas Control Winter Ops Mtg 11/15/01

2. Enron Transportation Services NNG Operations

3. NNG 2001 – 2002 Winter Operation • Zone E/F • Zone D • Zone C • Zone A • Rich/Lean Stream • Bypass Stream • Where in the World Wide Web

4. Enron Transportation Services Zone EF MN Viking Carlton Alexandria NNG Pierz Great Lakes North Branch Hugo WS NBPL Farmington Marshall Faribault Chatfield Welcome La Crescent Ventura Owatonna

5. Enron Transportation Services Zone EF - Willmar Branch Line MN Carlton Alexandria NNG Pierz North Branch Hugo WS Farmington Marshall Faribault Chatfield Welcome La Crescent Ventura Owatonna

6. Enron Transportation Services Zone EF – Willmar Branch Line • Heartland Corn TBS Modifications • Increase capacity of the TBS • Inlet minimum pressure override on the TBS • (Volume will decrease with the minimum pressure point at the TBS)

7. Enron Transportation Services Zone EF – KOCH Expansion MN Carlton Alexandria NNG Pierz North Branch Hugo WS Farmington Marshall Faribault Chatfield Welcome La Crescent Ventura Owatonna

8. Enron Transportation Services Zone EF – KOCH Expansion • 3 miles of 30-inch loop line from Farmington Station south • (D Line Loop) • 2.2 miles of 30-inch loop line north of Farmington • (C Line Loop)

9. Enron Transportation Services Zone EF – Hastings Branch Line Sale MN Carlton Alexandria NNG Pierz North Branch Hugo WS Farmington Marshall Faribault Chatfield Welcome La Crescent Ventura Owatonna

10. Enron Transportation Services Zone EF – Hastings Branch Line Sale ROSEMOUNT Y HASTINGS BRANCH LINE MNB 85802/MNB 85801 NEW TBS FOR HASTINGS OLD TBS FOR HASTINGS MAINLINE MNM 86501 & MNM 86502 Farmington Station

11. Zone E/F – Ventura Interconnect controls • New 12” V-ball for cntrl vlv 1, B-C north. • New 8” V-ball for cntrl vlv 1, B south. • Faster communication to D north control valve at Ventura station.

12. Zone D – East Leg operation • If Zone D plan volume is 650 MM/D or less for 24 hours or more, Hubbard should be on and Waterloo off. • The 260 MM pack and 950 PSIG Galena discharge targets are only required for Galena east plan volumes above 000 MM/D.

13. Zone C – Redfield H2S upset • Above 150 MM/D withdrawal, sour gas is shut in. Monitor situation. • Below 150 MM/D withdrawal sour gas will continue to flow into the Redfield B line. Initiate conference call with Ogden, Redfield, Des Moines Environmental Specialist, Des Moines management team member and Gas Control Director or Coordinator.

14. Zone C – Hubbard electric contract tracking • The new higher monthly target values will be in Hubbard RTU and tracked on the overview page. • Hubbard RTU will send daily alarm starting on the 10th of each month if electric usage is below 15%. The 15% minimum value will be tracked on the overview page.

15. Zone C – Glenwood Interconnect from B line • Side valves will be repositioned to feed NGPL from the B rather than the D line.

16. Zone A – Trailblazer expansion • Capacity increase to 450,000 MMBTU/D. • New flow control run connected to C suction with in-service target of Dec 1. • Can route TB to units 19 – 23 C suction header and discharge to B, C and/or D. • While isolating TB to C suction header, can bypass C, common with B suction or common with D suction.

17. Enron Transportation Services Beatrice Station Trailblazer Interconnect to C Suction • Trailblazer interconnect primarily on B-C line suction • at Beatrice • Wider selection of units for compression • Tie-over to the B line suction • Possible C-D line combination from Bushton to Beatrice • Increase capacity from 320 MMCF/D to 450 MMCF/D

18. Enron Transportation Services Beatrice Station Trailblazer Interconnect to C Suction A LINE FROM UNITS #19 & #20 TO UNITS #19 & #20 B LINE TO UNITS #19, #20, #21, #22, & #23 FROM UNITS #19, 20, #21, #22, #23, #24, &#25 C LINE TO UNITS #21, #22, #23, #24, & #25 FROM UNITS #19, 20, #21, #22, #23, #24, &#25 D LINE TO UNITS #24 & #25 FROM UNITS #24 & #25 UNIT #27 E LINE TRAILBLAZER LINE

19. Zone A – MUD LNG CO2 • The Omaha LNG plant liquefied in Sep/Oct/Nov as well as Apr/May. • Omaha 3rd branchline switched to A line on April 1 and back to B on Oct 1. • Main effort is to minimize TB gas to 3rd branchline.

20. Enron Transportation Services Pony Express Interconnect - Tescott PONY EXPRESS INTERCONNECT TO BEATRICE STATION TWO FLOW STUDIES C LINE PONY EXPRESS 160 MMCF/D 710 PSIG CLIFTON STATION BEATRICE STATION TESCOTT STATION Ps = 679 psig Pd = 679 psig Q = 160 MMCF/D UNIT #27 & #28 Ps = 643 psig Pd = 790 psig Q = 160 MMCF/D UNITS #21 & #22 Ps = 709 psig Pd = 709 psig Q = 160 MMCF/D UNIT #4 C LINE DISCHARGE – BUSHTON 0 MMCF/D C LINE PONY EXPRESS 160 MMCF/D 630 PSIG CLIFTON STATION TESCOTT STATION Ps = 675 psig Pd = 790 psig Q = 320 MMCF/D UNIT #27 & #28 Ps = 665 psig Pd = 790 psig Q = 320 MMCF/D UNITS #21 & #22 Ps = 625 psig Pd = 790 psig Q = 320 MMCF/D UNIT #4 C LINE DISCHARGE – BUSHTON 160 MMCF/D 660 PSIG

21. Rich/Lean Stream – Bushton Processing shut down • No expectations of plant shut down. • Target Palmyra C6+ to 0.1% maximum. • Decide if can blend to meet target. • Curtail highest C6+ production if necessary. • Configure system for blending. • Monitor Palmyra C6+. • Monitor critical points for hydrocarbon liquids.

22. Rich/Lean Stream – Burdett station bypass • Free flow ~105 MM/D from Holcomb. • Operate both Sublette turbines • Revert to operating Burdett from mid Oct through Mar because of open water cooling.

23. Rich/Lean Stream – Burdett to Lean • Oneok request to try and operate their Helium plant. • Divert Burdett line flows to the Lean inlet. • Intended to lower CO2 content but retain enough volume for Helium plant to run. • Bushton Controller 5 check valve flapper removal completed 11/14/01.

24. Bypass Stream – Beaver to Bushton configuration • Are some indicators that more gas will be sourced from the Beaver D-E discharge this season. • If occurs could justify switching Valve 6 to Mullinville C to Bypass service as well as Mullinville to Macksville piping.

25. Enron Transportation Services Beaver to Bushton – Line Utilization MAX FIRM CAPACITY BURDETT LINE 190 MMCF/D MULLINVILLE HUGTON B 310 MMCF/D A LINE 70 MMCF/D MACKSVILLE B LINE B LINE TEXAS B LINE 250 MMCF/D C LINE C LINE C LINE C LINE BEAVER D LINE D LINE BUSHTON C LINE C LINE D LINE D LINE E LINE E LINE CNG-BEAVER D LINE E LINE

26. Enron Transportation Services Beaver to Bushton – Line Utilization EXISTING LINE CONFIGURATION BURDETT LINE 190 MMCF/D MULLINVILLE HUGTON B 310 MMCF/D A LINE 70 MMCF/D MACKSVILLE B LINE B LINE TEXAS B LINE 250 MMCF/D C LINE C LINE C LINE BEAVER D LINE D LINE BUSHTON C LINE C LINE D LINE E LINE E LINE CNG-BEAVER D LINE E LINE

27. Enron Transportation Services Beaver to Bushton – Line Utilization • RECOMMENDATION TO MOVE TO MAX FIRM CAPACITY • Roger Mills volumes increase above 75 MMCF/D - 100 MMCF/D • Sunray C-D volumes increase above 275 MMCF/D - 300 MMCF/D

28. Bypass Stream – Gray County Interconnect • Existing NNG/TW Gray interconnect will remain in place • New tap & 16” line from NNG to CS P-3 being installed • NNG/TW CS P-3 interconnect to be bi-directional having facility capacity of 150 MMcfd (limited to 100 MMcfd by controls) • Delivery or receipts from/to TW will have capability to connect to either suction or discharge of CS P3 as pressures may dictate.

29. Where in the World Wide Web The Optimization website has changed: http://www.ets.enron.com/optimization/ • Log on with your corp id • Has latest Facility Operating Guidelines