Jan 13, 2012 RPG Meeting

El Campo – Vanderbilt 69 kV Project – Status report

Ehsan Ur RehmanPlanning EngineerERCOT

2 Jan. 13, 2012 RPG Meeting

Project Background

Jackson Electric Cooperative (JEC) Load addition

• Areas surrounded by Jackson, Victoria and Wharton Counties are part of Eagle Ford shale formation and are newly discovered oil exploration areas

• Oil reserves are estimated to be 3 billion barrels and is said to be the sixth largest oil field discovered in the USA

• Oil and gas exploration leads towards significant amount of load addition

• Approx. 118 MW of new electric load will be added in Jackson County, TX by the end of 2013

• Existing 69kV (STEC) system is composed of 4/0 ACSR conductor (45MVA) and cannot support the new load addition

3 RPG Meeting Jan 13, 2012

Map of the Area of concern

4 Jan. 13, 2012 RPG Meeting

Base Case Model & Assumptions

Study Cases

• The latest 2014 & 2016 Reliability Cases from the 2011 5YTP

Load Changes

• Load was updated/increased in the area of concern based on STEC’s submittal

• 2016 Case:- STEC load: 1503 MW

• 2014 Case:- STEC load: 1395 MW

Generation Changes

• Monticello 1 & 2 (in-service)

• Sam Bertron 1 & 2 (in-service)

• Greensbayou 5 (in-service)

• Panda Temple 1 (not available in 2014)

• All other mothballed units (turned off)

5 RPG Meeting Jan 13, 2012

Monitored Facility CntIndContingency RatingContLoading 8126 FORMOSA4A 138 80054 FOR A 69.0 1 FORMOSA(3) 133 185.53 8126 FORMOSA4A 138 80055 FOR B 69.0 1 FORMOSA(3) 149 168.99 5530 ROUNDMOTSW9 69.0 5535 RICEBIRD69KV 69.0 1 Vanderbilt - ETP & El Toro Sw Station - El Toro Switch 45 151.54 5516 ELTOROSWSTA9 69.0 5518 ELTOROSW9 69.0 1 ETP -Ricebird & Round Mott Sw - Ricebird 45 151.29 5530 ROUNDMOTSW9 69.0 5532 HILLJESUB9 69.0 1 Vanderbilt - ETP & El Toro Sw Station - El Toro Switch 45 147.5 5516 ELTOROSWSTA9 69.0 5518 ELTOROSW9 69.0 1 ETP -Ricebird & Hillje - Round Mott SW 45 146.88 5530 ROUNDMOTSW9 69.0 5535 RICEBIRD69KV 69.0 1 BTB ELTOROSWSTA9-ELTOROSW9 & ELTOROSW9-EL 45 141 5530 ROUNDMOTSW9 69.0 5535 RICEBIRD69KV 69.0 1 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 45 141 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 ETP -Ricebird & Round Mott Sw - Ricebird 45 140.9 5530 ROUNDMOTSW9 69.0 5532 HILLJESUB9 69.0 1 BTB ELTOROSWSTA9-ELTOROSW9 & ELTOROSW9-EL 45 136.89 5530 ROUNDMOTSW9 69.0 5532 HILLJESUB9 69.0 1 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 45 136.89 5528 LOUISESUB9 69.0 5532 HILLJESUB9 69.0 1 Vanderbilt - ETP & El Toro Sw Station - El Toro Switch 45 136.86 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 ETP -Ricebird & Hillje - Round Mott SW 45 136.53 5516 ELTOROSWSTA9 69.0 5518 ELTOROSW9 69.0 1 ETP -Ricebird & Louise - Hillje 45 133.13 5516 ELTOROSWSTA9 69.0 5518 ELTOROSW9 69.0 1 BTB LOUISESUB9-HILLJESUB9 & ROUNDMOTSW9-H 45 133.11 5516 ELTOROSWSTA9 69.0 5582 VANDERBLTSW9 69.0 1 ETP -Ricebird & Round Mott Sw - Ricebird 36 128.99 5525 GANADOSW9 69.0 5528 LOUISESUB9 69.0 1 Vanderbilt - ETP & El Toro Sw Station - El Toro Switch 45 126.48 5528 LOUISESUB9 69.0 5532 HILLJESUB9 69.0 1 BTB ELTOROSWSTA9-ELTOROSW9 & ELTOROSW9-EL 45 126.24 5528 LOUISESUB9 69.0 5532 HILLJESUB9 69.0 1 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 45 126.24 5516 ELTOROSWSTA9 69.0 5582 VANDERBLTSW9 69.0 1 ETP -Ricebird & Hillje - Round Mott SW 36 124.8 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 ETP -Ricebird & Louise - Hillje 45 122.53 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 BTB LOUISESUB9-HILLJESUB9 & ROUNDMOTSW9-H 45 122.52 5524 CORDELESUB9 69.0 5525 GANADOSW9 69.0 1 Vanderbilt - ETP & El Toro Sw Station - El Toro Switch 45 122.46 5516 ELTOROSWSTA9 69.0 5582 VANDERBLTSW9 69.0 1 5500 RAYBURN9 69.0 5504 NURSERYSUB9 69.0 1 36 122.26 5516 ELTOROSWSTA9 69.0 5518 ELTOROSW9 69.0 1 ETP -Ricebird & Ganado SW - Louise 45 120.27 5525 GANADOSW9 69.0 5528 LOUISESUB9 69.0 1 BTB ELTOROSWSTA9-ELTOROSW9 & ELTOROSW9-EL 45 116.06 5525 GANADOSW9 69.0 5528 LOUISESUB9 69.0 1 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 45 116.06 5516 ELTOROSWSTA9 69.0 5518 ELTOROSW9 69.0 1 ETP -Ricebird & Cordele - Ganado Sw 45 115.84 5516 ELTOROSWSTA9 69.0 5518 ELTOROSW9 69.0 1 BTB EDNASUB9-GANADOSW9 & GANADOSW9-GANADO 45 115.78 5516 ELTOROSWSTA9 69.0 5582 VANDERBLTSW9 69.0 1 BTB LOUISESUB9-HILLJESUB9 & ROUNDMOTSW9-H 36 114.56 5516 ELTOROSWSTA9 69.0 5582 VANDERBLTSW9 69.0 1 ETP -Ricebird & Louise - Hillje 36 114.48 5524 CORDELESUB9 69.0 5525 GANADOSW9 69.0 1 BTB ELTOROSWSTA9-ELTOROSW9 & ELTOROSW9-EL 45 112.19 5524 CORDELESUB9 69.0 5525 GANADOSW9 69.0 1 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 45 112.19 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 ETP -Ricebird & Ganado SW - Louise 45 110.33 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 ETP -Ricebird & Cordele - Ganado Sw 45 105.96 5518 ELTOROSW9 69.0 5522 EDNASUB9 69.0 1 BTB EDNASUB9-GANADOSW9 & GANADOSW9-GANADO 45 105.89 5516 ELTOROSWSTA9 69.0 5582 VANDERBLTSW9 69.0 1 5504 NURSERYSUB9 69.0 5510 FORDTRANSW9 69.0 1 36 103.51 5516 ELTOROSWSTA9 69.0 5582 VANDERBLTSW9 69.0 1 ETP -Ricebird & Ganado SW - Louise 36 103.31

Overloads on existing system due to updated loading in 2014

6 Jan 13, 2012 RPG Meeting

Project Options

Option 1 (345 kV)

• Build a new 345 kV station near Cordelle and loop the STP – Elm Creek 345 kV line into it

• Add a 345/138 kV auto-transformer

• Build a new 138 kV line (approx. 1.5 miles) to the new load serving 138/24.9 kV distribution system

• Add 9.6 Mvar capacitor banks at Cordele and Ganado Switch

Total Cost :- $24.5 million

Facts

• The load will be radially connected to the 345 kV station

• The 18.7 MW of load at Cordelle 69 kV still requires Vanderbilt – Eltoro and Ricebird – Round Mott 69 kV line to be upgraded

• No New load can be served through the existing weak 69 kV transmission system without these upgrades

7 RPG Meeting Jan 13, 2012

Option 1 (345 kV) topology with entire load moved to the new distribution station

8 RPG Meeting Jan 13, 2012

Loading after moving the Cordelle load (18.7 MW) served radial from 345 kV (2016 case)

Monitored Facility Contingency RatingContBaseFlRs 8126 FORMOSA4A 138 80054 FOR A 69.0 1 FORMOSA(3) 133 184.18 8126 FORMOSA4A 138 80055 FOR B 69.0 1 FORMOSA(3) 149 167.76 1813 CUMBY1_T9 69.6 1815 CUMBY1_T8 138 1 Base Case 38 102.99 7182 L_MCCALA8_1Y 138 7186 L_RARO128_1Y 138 1 L_ZORN__8_1Y:L_MCCALA8_1Y/L_ZORN__8_1Y:L_ 220.6 102.01 38850 TNDICKNSON1 138 38920 TNLEAGCITY1 138 1 38890 TNSOUSHORE1 138 42015 P_H_R___138C 138 1 210 99.97 3119 NACOGDSE_5 345 3120 NACOGDSE_8 138 1 MARTINLK_5-MTENTRPR_5 & MTENTRPR_5-TRINDA 600 99.6 8126 FORMOSA4A 138 8140 JOSLIN 4 138 1 FORMOSA(3) 216 98.93 5516 ELTOROSWSTA9 69.0 5582 VANDERBLTSW9 69.0 1 5500 RAYBURN9 69.0 5504 NURSERYSUB9 69.0 1 36 98.85 7180 L_ZORN__8_1Y 138 7184 L_MCCALA8_2Y 138 1 ZORN-BEEBACK/ZORN-McCARTY 441.2 98.12 1794 MOSES_T8 138 1796 SULBLF1_8 138 1 MOSES_5-SULSP_SS1_5 & MOSES1_T5-ALLENSW2_ 186 98.12 13430 SAND_TXU_8 138 13431 SANDOW SW_8 138 1 SANDOW1_8-SAND_TXU_8 & SAND_TXU_8-SANDTXU_1899 717 98.02 44100 BRAZOS__8015 138 44231 CFLEWLN_8040 138 09 MASON_-FLEWLN_25 (44230-44450) & OBRIEN-F 280 97.95 32871 BRYN_BUSPARK 69.0 32875 BRYN_DSBY69 69.0 1 32875 BRYN_DSBY69 69.0 32897 BRYN_DSBY138 138 1 108 97.75 41310 QUANAB__138A 138 41400 S_R_B___138A 138 06 JEFFER-PASDNA_06 (41240-43040)[MSL &1] & C 526 97.47 7178 L_MARION8_1Y 138 7603 L_WEILRO8_1Y 138 1 L_MARION8_1Y-L_GPISWI8_1Y & L_MARION8_1Y- 279 97.11 3120 NACOGDSE_8 138 3319 HERTYNOR_8 138 1 MARTINLK_5-MTENTRPR_5 & MTENTRPR_5-TRINDA 214 96.93 7180 L_ZORN__8_1Y 138 7184 L_MCCALA8_2Y 138 1 McCARTY-BEEBACK/ZORN-McCARTY 441.2 96.74 7228 L_SEGUIN8_1Y 138 7229 L_SEGUWE8_1Y 138 1 7044 L_MARION5_1Y 345 7178 L_MARION8_1Y 138 1 220 96.71 44120 BRITMR__138A 138 44311 HAYES24_8015 138 24 47012 BELAIR24138D 138 47442 ULRICH248035 138 24 290 96.67 45511 T_H_W81_8090 138 45515 T_H_W___138E 138 81 CAMRON-T_H_W__21 (45700-45515) & BRITMR-T 526 96.61 47700 MAG_PK__138A 138 47751 UNIVER__8000 138 70 GRNBYU-WHITOK_03 (40715-46610)[MSL &1] & G 526 96.28 38820 TNFRWYPARK1 138 38850 TNDICKNSON1 138 1 38890 TNSOUSHORE1 138 42015 P_H_R___138C 138 1 287 96.28 7186 L_RARO128_1Y 138 7190 L_HILLTO8_1Y 138 1 L_ZORN__8_1Y:L_MCCALA8_1Y/L_ZORN__8_1Y:L_ 220.6 96 3118 LUFKNSS_8 138 3333 LUFTXFND_8 138 1 3319 HERTYNOR_8 138 3326 LUFKINE_8 138 1 251 95.95 7603 L_WEILRO8_1Y 138 7608 L_CIBOLO8_1Y 138 1 L_MARION8_1Y-L_GPISWI8_1Y & L_MARION8_1Y- 279 95.41 5530 ROUNDMOTSW9 69.0 5535 RICEBIRD69KV 69.0 1 Vanderbilt - ETP & El Toro Sw Station - El Toro Switch 45 95.41 32872 BRYN_NALL 69.0 32877 BRYN_BRCREST 69.0 1 32864 BRYN_ATK69 69.0 32862 BRYN_ATK138 138 1 44 95.41 7352 L_LAGOVI8_1Y 138 7526 L_NAMELE8_1Y 138 1 7529 L_WHITES8_1Y 138 7531 L_BUTTER8_1Y 138 1 220.6 95.22 9077 MCNEILS 138 9238 MAGPLANT 138 1 9079 MCNEILN 138 9279 SUMMITN 138 1 480 95.21

9 Jan 13, 2012 RPG Meeting

Project Options (Cont.)

Option 2 (69/138 kV rebuild)

• Rebuild the existing 69 kV line (22 miles) from El Campo and Cordelle as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively

• Rebuild the existing 69 kV line (13 miles) from Cordelle and El Toro switch as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively

• Rebuild the existing 69 kV line (13.6 miles) from El Toro and Vanderbilt switch as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively

• Install 9.6 Mvars of capacitor banks at Louisville 69 kV, Ganado 69 kV, Cordele 69 kV and ETP sub 138kV

• Construct a new 138 kV double circuit line (on a new R.O.W) from the ETP substation to a single new 84 MW load

Total Cost :- $ 27.33 million

10 Jan 13, 2012 RPG Meeting

Option 2 Upgrades

11 RPG Meeting Jan 13, 2012

Monitored Facility CntInd Contingency RatingContLoading 8126 FORMOSA4A 138 80054 FOR A 69.0 1 2000 FORMOSA(3) 133 185.5 8126 FORMOSA4A 138 80055 FOR B 69.0 1 2000 FORMOSA(3) 149 168.96 1791 MOSESMIN_8 138 1795 MOSES1_8 138 1 1622 MOSES_5-SULSP_SS1_5 & MOSES1_T5-ALLENSW2_ 124 103.05 8126 FORMOSA4A 138 8140 JOSLIN 4 138 1 2000 FORMOSA(3) 216 102.41 7182 L_MCCALA8_1Y 138 7186 L_RARO128_1Y 138 1 1460 L_ZORN__8_1Y:L_MCCALA8_1Y/L_ZORN__8_1Y:L_ 220.6 100.61 3119 NACOGDSE_5 345 3120 NACOGDSE_8 138 1 1866 MARTINLK_5-MTENTRPR_5 & MTENTRPR_5-TRINDA 600 99.65 1813 CUMBY1_T9 69.6 1815 CUMBY1_T8 138 1 0 Base Case 38 99.22 44100 BRAZOS__8015 138 44280 FTBEND__138D 138 09 1067 MASON_-FLEWLN_25 (44230-44450) & OBRIEN-F 280 99 9076 MCNEILW 138 9188 DECK_MB3 138 1 6868 9045 DUNLAP8 138 9190 TECHRIDG 138 1 480 98.48 32871 BRYN_BUSPARK 69.0 32875 BRYN_DSBY69 69.0 1 8558 32875 BRYN_DSBY69 69.0 32897 BRYN_DSBY138 138 1 108 97.81 13430 SAND_TXU_8 138 13431 SANDOW SW_8 138 1 1898 SANDOW1_8-SAND_TXU_8 & SAND_TXU_8-SANDTXU_1898 717 97.61 7352 L_LAGOVI8_1Y 138 7356 L_MARSFO8_1Y 138 1 6348 7529 L_WHITES8_1Y 138 7531 L_BUTTER8_1Y 138 1 217.3 97.58 40370 CONIAL__138X 138 41670 WABURN__138B 138 84 1001 JEFFER-PASDNA_06 (41240-43040)[MSL &1] & C 220 97.54 47500 DWNTWN__138A 138 47730 POLK____138A 138 91 1056 GABLE_-GRNBYU_21 (40710-47630)[MSL &1] &_1056 334 97.45 5500 RAYBURN9 69.0 5504 NURSERYSUB9 69.0 1 2039 BTB Vanderbilt - ETP & Vanderbilt - El Toro Sw Station 45 97.2 3120 NACOGDSE_8 138 3319 HERTYNOR_8 138 1 1866 MARTINLK_5-MTENTRPR_5 & MTENTRPR_5-TRINDA 214 96.23 7215 L_LOCKHA9_1Y 69.0 7216 L_LOCKHA8_1Y 138 1 6150 7216 L_LOCKHA8_1Y 138 7224 L_LULING8_1Y 138 1 45 96 7186 L_RARO128_1Y 138 7190 L_HILLTO8_1Y 138 1 1460 L_ZORN__8_1Y:L_MCCALA8_1Y/L_ZORN__8_1Y:L_ 220.6 95.15

Option 2 (n-1) results for 2014

12 RPG Meeting Jan 13, 2012

Option 2 (n-1) results for 2016

Monitored Facility CntInd Contingency RatingContLoading 8126 FORMOSA4A 138 80054 FOR A 69.0 1 2001 FORMOSA(3) 133 183.87 8126 FORMOSA4A 138 80055 FOR B 69.0 1 2001 FORMOSA(3) 149 167.48 1813 CUMBY1_T9 69.6 1815 CUMBY1_T8 138 1 0 Base Case 38 103 7182 L_MCCALA8_1Y 138 7186 L_RARO128_1Y 138 1 1461 L_ZORN__8_1Y:L_MCCALA8_1Y/L_ZORN__8_1Y:L_ 220.6 102.05 38850 TNDICKNSON1 138 38920 TNLEAGCITY1 138 1 7208 38890 TNSOUSHORE1 138 42015 P_H_R___138C 138 1 210 100.98 1794 MOSES_T8 138 1796 SULBLF1_8 138 1 1623 MOSES_5-SULSP_SS1_5 & MOSES1_T5-ALLENSW2_ 186 100.76 3119 NACOGDSE_5 345 3120 NACOGDSE_8 138 1 1867 MARTINLK_5-MTENTRPR_5 & MTENTRPR_5-TRINDA 600 99.62 44100 BRAZOS__8015 138 44231 CFLEWLN_8040 138 09 1068 MASON_-FLEWLN_25 (44230-44450) & OBRIEN-F 280 98.32 5500 RAYBURN9 69.0 5504 NURSERYSUB9 69.0 1 2040 BTB Vanderbilt - ETP & Vanderbilt - El Toro Sw Station 45 98.31 7180 L_ZORN__8_1Y 138 7184 L_MCCALA8_2Y 138 1 1451 ZORN-BEEBACK/ZORN-McCARTY 441.2 98.18 13430 SAND_TXU_8 138 13431 SANDOW SW_8 138 1 1899 SANDOW1_8-SAND_TXU_8 & SAND_TXU_8-SANDTXU_1899 717 98.16 8126 FORMOSA4A 138 8140 JOSLIN 4 138 1 2001 FORMOSA(3) 216 97.93 5500 RAYBURN9 69.0 5502 RAYBURN8 138 1 717 BTB RAYBURN8-VANDERBLTSW8 84 97.9 32871 BRYN_BUSPARK 69.0 32875 BRYN_DSBY69 69.0 1 8619 32875 BRYN_DSBY69 69.0 32897 BRYN_DSBY138 138 1 108 97.75 41310 QUANAB__138A 138 41400 S_R_B___138A 138 06 1002 JEFFER-PASDNA_06 (41240-43040)[MSL &1] & C 526 97.49 1796 SULBLF1_8 138 1797 ROCKWELL_T8 138 1 1623 MOSES_5-SULSP_SS1_5 & MOSES1_T5-ALLENSW2_ 186 97.32 7178 L_MARION8_1Y 138 7603 L_WEILRO8_1Y 138 1 1422 L_MARION8_1Y-L_GPISWI8_1Y & L_MARION8_1Y- 279 97.24 38820 TNFRWYPARK1 138 38850 TNDICKNSON1 138 1 7208 38890 TNSOUSHORE1 138 42015 P_H_R___138C 138 1 287 97.03 7228 L_SEGUIN8_1Y 138 7229 L_SEGUWE8_1Y 138 1 8499 7044 L_MARION5_1Y 345 7178 L_MARION8_1Y 138 1 220 97 3120 NACOGDSE_8 138 3319 HERTYNOR_8 138 1 1867 MARTINLK_5-MTENTRPR_5 & MTENTRPR_5-TRINDA 214 96.96 5500 RAYBURN9 69.0 5502 RAYBURN8 138 1 8426 5605 WARBURTON9 69.0 8907 WRBRTN8 138 1 84 96.82 7180 L_ZORN__8_1Y 138 7184 L_MCCALA8_2Y 138 1 1452 McCARTY-BEEBACK/ZORN-McCARTY 441.2 96.8 44120 BRITMR__138A 138 44311 HAYES24_8015 138 24 7878 47012 BELAIR24138D 138 47442 ULRICH248035 138 24 290 96.67 45511 T_H_W81_8090 138 45515 T_H_W___138E 138 81 1048 CAMRON-T_H_W__21 (45700-45515) & BRITMR-T 526 96.5 5500 RAYBURN9 69.0 5502 RAYBURN8 138 1 8425 5582 VANDERBLTSW9 69.0 5584 VANDERBLTSW8 138 1 84 96.28 47700 MAG_PK__138A 138 47751 UNIVER__8000 138 70 964 GRNBYU-WHITOK_03 (40715-46610)[MSL &1] & G 526 96.26 7186 L_RARO128_1Y 138 7190 L_HILLTO8_1Y 138 1 1461 L_ZORN__8_1Y:L_MCCALA8_1Y/L_ZORN__8_1Y:L_ 220.6 96.04 3118 LUFKNSS_8 138 3333 LUFTXFND_8 138 1 4755 3319 HERTYNOR_8 138 3326 LUFKINE_8 138 1 251 95.96 7603 L_WEILRO8_1Y 138 7608 L_CIBOLO8_1Y 138 1 1422 L_MARION8_1Y-L_GPISWI8_1Y & L_MARION8_1Y- 279 95.54 38530 TNTEJAS___1 138 38575 TNGRENBELT1 138 1 7185 38575 TNGRENBELT1 138 38710 TNCADDO___1 138 1 379 95.52 32872 BRYN_NALL 69.0 32877 BRYN_BRCREST 69.0 1 8615 32864 BRYN_ATK69 69.0 32862 BRYN_ATK138 138 1 44 95.42 9077 MCNEILS 138 9238 MAGPLANT 138 1 6927 9079 MCNEILN 138 9279 SUMMITN 138 1 480 95.28 7352 L_LAGOVI8_1Y 138 7526 L_NAMELE8_1Y 138 1 6386 7529 L_WHITES8_1Y 138 7531 L_BUTTER8_1Y 138 1 220.6 95.04

13 Jan 13, 2012 RPG Meeting

G-1 analysis for Option 2

• Option 2 (rebuilding of existing 69 kV and adding 138kV lines) was analyzed under G-1 conditions

• The biggest combined cycle train at Colorado Bend (252 MW) was turned off.

• Nursery – Rayburn 69 kV line was shown overloaded in both 2014 and 2016

14 Jan 13, 2012 RPG Meeting

Facts about Option 2 upgrades

• Load will not be radially connected with Option 2

• More load can be connected to the 69 kV system with Option 2 in future

• Nursery – Rayburn 69 kV line has to be upgraded with Option 2 upgrades

15 Jan 13, 2012 RPG Meeting

Summary

Summary

Rebuilding the existing 69 kV transmission system (Option 2 upgrades) seems to be a better option as additional load may be connected to the existing 69 kV substations in future.

However, after performing the G-1 analysis, it is mandatory to include Nursery – Rayburn 69 kV upgrade as a part of Option 2 Upgrades to serve future loads additions.

Thus the final Option 2 Upgrades are listed on the following slide

16 Jan 13, 2012 RPG Meeting

Summary (Cont.)

Updated Option 2 Upgrades (69/138 kV rebuild)

• Rebuild the existing 69 kV line (22 miles) from El Campo and Cordelle as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively

• Rebuild the existing 69 kV line (13 miles) from Cordelle and El Toro switch as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively

• Rebuild the existing 69 kV line (13.6 miles) from El Toro and Vanderbilt switch as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively

• Install 9.6 Mvars of capacitor banks at Louisville 69 kV, Ganado 69 kV, Cordele 69 kV and ETP sub 138kV

• Construct a new 138 kV double circuit line (on a new R.O.W) from the ETP substation to a single new 84 MW load

• Upgrade Nursery – Rayburn 69 kV line such the the Circuit Rate B is 122 MVA

Total Updated Cost :- $ 28.15 million

17 September 17, 2010 RPG Meeting March 12, 2010

Questions?