Entergy Gulf States Inc Louisiana Proposed Transmission Reliability

Entergy Gulf States, Inc. (Louisiana) Proposed Transmission Reliability Projects Entergy Transmission Planning Summit New Orleans, LA July 10, 2003 1

2004 EGSI-LA Transmission Reliability Projects Mc. Manus Capacitor Bank Addition Harelson Substation: 230/69 k. V Auto Replacement Carryover – 4 -30 -2004 ISD Port Hudson 69 k. V Breaker Replacement Coly-Hammond: Build 230 k. V line 2006 ISD. Chlomal-Jennings Line 13 Upgrade Willow Glen: Breaker Replacement Program 5 – 230 k. V breakers Port Hudson-Crown Zellerbach Line upgrade 69 k. V Five Points-Erath Line Upgrade Improve ASI REVISED: Build line Conway-Panama (2004 ISD) Carryover SEE ELI Presentation 2

230 k. V Harelson Substation: Replace 2 nd 2004 230/69 k. V 200 MVA auto with a 300 MVA unit • Harelson 230/69 k. V substation, located in eastern Baton Rouge, has two 200 MVA autotransformers. This substation, in conjunction with Coly substation, serves an area with one of the highest load growths in south Louisiana. • Contingency: Under peak loading conditions, loss of one of the existing 230/69 k. V autotransformers at Harelson can potentially overload the other unit by 19%. • Recommended Solution: Replace 2 nd 200 MVA auto with another 300 MVA unit. The 1 st auto will have been in-service by 12 -13 -2003 (T#2). Substation space constraints prohibited the installation of a third auto. • Total Estimated Cost: $4. 2 M • Estimated In-service Date: 4 -30 -2004 Cost: $700 K 3

2004 230 k. V Harelson Substation Harelson Weiner 4

2004 EGSI-LA Circuit Breaker Replacement Program • Mandatory: Safety Issue – Replace five 230 k. V circuit breakers at Willow Glen Substation – Replace one 69 k. V circuit breaker at Port Hudson • Total Estimated Program Cost: $7. 3 M – 2004 Cost: ~$2. 8 M • Estimated ISD: 7 -30 -2004 5

2004 138 k. V Line 368 Port Hudson-Crown Zellerbach: The 138 k. V substations in East Baton Rouge and East Feliciana Parishes are served by 2 -230/138 k. V autos located at Port Hudson substation. This industrial loop serves approximately 237 MVA. Contingency: Under peak loading conditions, loss of the Repapco-Port Hudson line can potentially overload Line 368 (Port Hudson-Crown Zellerbach) by as much as 36% in 2004, that portion of line composed of 795 AA and rated at 174 MVA. Recommended Solution: Reconductor 7. 5 miles of Line 368 with a conductor capable of at least 301 MVA or 1260 A. Estimated Cost: $3. 81 M 6

2004 138 k. V Line 368 Port Hudson-Crown Zellerbach Line 368 7

Chlomal-Jennings Loop Upgrade 2004 • The 69 k. V transmission system between Jennings and Chlomal substations will serve approximately 73 MW of load including the radial from Lawtag substation in 2004. The main "trunk" of these systems are the contiguous segments comprising of Line 13 (Jennings-Compton-Elton), Line 16 (Elton-Tupper-Serpent -Carter), and Line 11 (Carter-Lacassine-Chlomal). • The other main "trunk" is comprised of Line 14 (Jennings-Lawtag) and Line 12 (Lawtag-Welsh-Derouen-Iowa-Chlomal), which span approximately 29 miles and serve approximately 39 MW. • These lines are over 50 years old. Their age have manifested in reduced reliability and reduced load-serving capacity. Between 1997 and 2001, an average of 19 outages per year occurred on the northern route (Lines 11, 13, and 16). In 2002, 13 outages were recorded. • Splices have been used to make repairs and they are beginning to fail. The current loading can potentially cause the 69 k. V lines to sag into the distribution underbuild that is located along most of these lines. Upgrading these lines is needed to avoid safety and reliability concerns. 8

Line 11/12/13/15/16 69 k. V Upgrade 9

Chlomal-Jennings Loop Upgrade (continued) For Existing Configuration: Contingency Loss of Jennings-Compton Loss of Jennings-Elton Loss of Chlomal-Lacassine Loss of Jennings-Lawtag Overload/Undervoltage Chlomal-Lacassine 13% Depressed local area voltages (0. 78 p. u. at Compton) Chlomal-Lacassine loads to 99% Jennings-Compton 30% Depressed local area voltages(0. 75 p. u. at Lacassine) Elton-Tupper 5% Chlomal-Iowa 6% Depressed local area voltages (0. 91 p. u. at Potter) Possible solution: Upgrade 46 miles of line Chlomal-Serpent and Jennings to Compton rated 33 MVA/ 39 MVA with a conductor capable of 72 MVA or 602 amps. Install breaker at Lacassine. Estimated cost: $13 M ($2. 5 M for 2004) Expected In-Service Date: October 2010 10

Existing Configuration of Lines 11, 12, 13, 14 & 16 Serpent Tupper L 16 Elton Carter Chlomal Welsh Iowa Derouen L 11 Compton L 12 Normally-Opened Lacassine L 13 A Lawtag. L 14 Jennings L 13 Roanoke Robbie LEGEND Radial to Winn/Potter/Thornwell/ Tex. Lake Station with Breaker Non-Breaker Station with Proposed Breakers 11

Chlomal-Jennings Loop Upgrade (continued) For Modified Proposal: Contingency Loss of Jennings-Lawtag Loss of Carter-Lacassine Loss of Chlomal-Lacassine Loss of Lawtag-Compton Overload/Undervoltage Chlomal-Iowa 119% Lawtag-Jennings 32% Lawtag-Jennings 43% Tupper, Serpent, Compton, Elton < 0. 9 p. u. Possible solution: Upgrade 25. 5 miles of line Chlomal to Carter and Jennings to Roanoke pt rated 33 MVA/ 39 MVA with a conductor capable of 93 MVA or 780 amps. Install breaker at Lacassine. Total Estimated cost: $13 M ($3. 5 M for 2004) Expected In-Service Date: October 2010 12

Modified Proposed Reconfiguration Serpent Tupper Elton Carter Compton Chlomal Iowa Lawtag Welsh Derouen Lacassine Jennings Roanoke Robbie LEGEND Station with Breaker Non-Breaker Station Lines that can be deenergized or taken out of service. Station with Proposed Breakers 13 Radial to Winn/Potter/Thornwell/ Tex. Lake

2004 Mc. Manus 69 k. V Substation: Replace Cap Bank & Correct Load PF • Mc. Manus 69 k. V Substation is located north of Baton Rouge in East Feliciana Parish near the end of a 12 mile radial 69 k. V line. There will be approximately 70 MW of load in the area in 2004. • Contingency: Loss of Port Hudson to Jackson 69 k. V will cause voltages less than 0. 91 p. u. near the end of this line. • Recommended Solution: Replace existing 18 MVAr capacitor bank with 1 -30 MVAR capacitor bank. • Estimated Cost: $550 K 14

Mc. Manus 69 k. V Substation 15

69 k. V Line 280 (Five Points -Erath) 2004 • The 69 k. V substations Five Points, Texas Erath, and Le. Blanc in Vermillion and Iberia Parishes are served by two sources, Meaux and Moril. The load served by the four 69 k. V substations will be approximately 41 MW in 2004. • Contingency: Under peak loading conditions, loss of the Moril 138/69 k. V autotransformer can potentially overload a portion of Line 280 (Five Points to Erath) by 13% in 2004, that portion of line is composed of 4/0 ACSR and rated at 39 MVA. • Recommended Solution: Reconductor 5. 01 miles of 69 k. V Five Points-Erath with a conductor capable of 72 MVA. • Estimated Cost: $1. 3 M 16

69 k. V L 280 (Five Points -Erath) These lines (Line 280 & 649) do not connect. TIGRE 17

2005+ EGSI-LA Transmission Target Areas 69 k. V Jackson- Marydale Line Upgrade: ISD 2005 Coly-Hammond: Build 230 k. V line 2006 ISD Winn 69 k. V 18 MVAR Capacitor Installation: ISD 2005 69 k. V Lafayette-Holiday Line Upgrade: ISD 2006 69 k. V Harelson-Flannery Rd Line Upgrade: ISD 2006 18 138 k. V Willow Glen-Alchem Line Upgrade: ISD 2005

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