Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 94 FERC Electric Tariff, Third Revised Volume No. 6

7901 7891 7900 /---^. TO AEP 138kV NORTH PHARR

^-^ TO AEP 138kV 7790 S.E. EDINBURG 7791 7789 "^ 7143 MC r, STEC D1';2 D113 D103 D102 2.19 MI.' TO 138kV 1-•^MI ss D 1 10 - D100 MERRET TO 138kV ALBERTA TAP

^.S. 1 C.S. D160 - D130

q WNERSHIP CHANGE

138kV LINE

^ Y-Y,^1 ^YY-Y1 N^ {• > CIRCUIT SWITCHER

F-1 CIRCUIT BREAKER

SOUTH TEXAS ELECTRIC COOPERATIVE, INC. D^. W PH-IA P.C. BOX 119 NURSERY, TEXAS 77976 FACILITY PHARR SUBSTATION SCHEDULE 37 HIDALGO COUNTY PHARR TIE CKG. BY______._

DWN 8Y JT i PP'J BY SGIr NA I DAiE .. . G/OS

Issued by: Richard E. Munezinski. Senior Vice President Effective Date: February 19, 20I0 Regulatory Services Issued on: March I2. 20 10 100 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No- 95 FERC Electric Tariff. Third Revised Volume No_ 6

FACILITY SCHEDULE NO. 38

1. Name: North Edinburg 69 2. Facility Location: Company's North Edinburg Substation Company's North Edinburg Substation located on the northwest side of the Monte Cristo Road (FM 1925) and McColl Road intersection in Edinburg, Hidalgo County 3_ Voltage at Point of Interconnection: 69kV 4. Metered Voltage: 69kV, line monitoring meter 5_ Loss Adjustment Due To Meter Location: No 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes 8. Description of Facilities Installed and Owned by Each Party: Company owns all equipment at this substation except for the following, which is owned by MVEC: • Cooperative SCADA monitoring and control equipment • Weather monitoring and communications equipment • Fiber communications equipment used for Cooperative communication • Cooperative's 69kV Faysville tap line connecting to Company's deadend structure inside the station 9_ Operational Responsibilities of Each Party: Cooperative operates Breaker 43390. Company operates all remaining equipment at this station. 10. Maintenance Responsibilities of Each Party: Each Party is responsible for the maintenance of its own equipment. Company will maintain the site including vegetation control. 11. Other Terms and Conditions: Cooperative has access to the station with a lock in the fence gate(s) and access to the control house.

,

Issued by: Richard E. Mtmezinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12. 2010 101 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No_ 96 FERC Electric Tariff. Third Revised Volume No. 6

3317 ^ ^F-,^ 3Ft! TO 3M2 il.Y.EG. 3572 -^f r $81^f -4 TOT^tALti. STEC 11Q XFFlthNt ,=iEP ^t 1Et^iCTs^^ L - 3^ ^ ^t TO 4242 V AM - ^^ fiEEtAYfi. 4240 i0048= ^\ ._.^. _..^#m^ 330 J 3179 8996 38&'i 399g pr N p 32B4 W 30 30 3398 3181 3PI

gm 5M 1 SM T

3PTs

TO TO ^ MW(F t6ERtRD SEEDWG. ^ ^ t ^. 8UST1E ^-^ sW 3318

5m H.p. 58D 3t68.8.

NO t1ptJlCS 38t2 968a Ko. 3810 _J-.` 3P% ^ 3811 ^ 3848 352 ti NA ^® 360 s.& IkZ ^ Tori^iUU 349 El 351 )M sW.

TEXAS CENTRAL COMPANY NORTH EfJf'^^1.BU',^'C^^' ^t ti04 (P^-tr`^i

C}f?FT.RLC ENt;.. A, PP DATE, 1014107 DM..10OWS00.3

Issued by: Richard E. Munczinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 20 10 102 Operating Companies of the First Revised Service Agreement No. 341 Amencan Electric Power System Original Sheet No. 97 FERC Electric Tariff, Third Revised Volume No. 6

FACILITY SCHEDULE NO. 39

1. Name: Raymondville No. 2 2. Facility Location: Company's Raymondville No. 2 Substation approx one mile east of the FM 186 and Hwy 77 Bypass intersection near Raymondville, Willacy County 3_ Voltage at Point of Interconnection: 138kV 4. Metered Voltage: 138kV, line monitoring meter 5. Loss Adjustment Due To Meter Location: No 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes 8. Description of Facilities Installed and Owned by Each Party: Company owns all equipment at this substation except for the following, which is owned by Cooperative: • Weather monitoring and communications equipment. • Cooperative SCADA monitoring equipment. • Communications equipment used for Cooperative communication. • Cooperative's 138kV line connecting to Company's deadend structure in the station 9_ Operational Responsibilities of Each Party: Cooperative operates breaker 1040. Company operates all other equipment at this station. 10. Maintenance Responsibilities of Each Party: Each Party is responsible for the maintenance of its own equipment. Company will maintain the site including vegetation control- 11. Other Terms and Conditions: Cooperative has access to the station with a lock in the fence gate(s) and access to the control room.

Issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 103 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 98 FERC Electric Tariff, Third Revised Volume No. 6

1 as WAR

W 1045

TOW HOW M 240 1036 ^^tt^^.. 1034 AEF jSTEC TO UST AY.4ON AqIE 1041 1R40 1019

TO AUTO 138/69KY €OZt 1^ 1GS9 SEE OY7G. 10255M-1

TO tO'fO1.A ^ iEt 3Q23

TEXAS CENTRAL COMPANY RA ^^^01VD VIL L L 4^4 - SUB if 1025 01'. 1025S1^'t2

Issued by: Richard E. Mtmezinski, Senior Vice President Effective Date: February 19, 20I0 Regulatory Services Issued on: March 12,,20 10 104 Operating Companies of the First Revised Service Agreement No. 34I American Electric Power System Original Sheet No. 99 FERC Electric Tariff Third Revised Volume No. 6

FACILITY SCHEDULE NO. 40

1. Name: Port Mansfield Tie Line 2_ Facility Location: Pole mounted meter on the East Ranch on Company's last pole in the 12.47 kV feeder, approximately 20 miles east of Company's Raymondville No. 2 Substation. 3. Voltage at Point of Interconnection: 12.47 kV 4. Metered Voltage: 12.47 kV 5. Loss Adjustment Due To Meter Location: Yes. 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: No 8. Description of Facilities Installed and Owned by Each Party: Company owns the metering equipment. Cooperative owns the switch that isolates its portion of the 12.47 kV circuit, an RTU and communication equipment. Magic Valley Electric Cooperative owns the distribution line connected past this meter point. 9_ Operational Responsibilities of Each Party: Each party will operate its own equipment. Any switching shall be performed using good utility practice after informing the other party. 10. Maintenance Responsibilities of Each Party: Maintenance is the responsibility of the equipment owner except that Cooperative shall maintain the meter, instrument transformers, and the isolation device(s)- 11. Other Terms and Conditions: Company calculates the loss factor based upon resistances between this meter point and the ERCOT system.

Issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 20 10 Regulatory Services Issued on: March 12, 2010 105 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 100 FERC Electric Tariff, Third Revised Volume No. 6

FACILITY SCHEDULE NO. 41

1. Name: Rangerville 2. Facility Location: Cooperative Rangerville Substation at 18669 FM 800, Rangerville, Cameron County 3. Voltage at Point of Interconnection: 138kV 4_ Metered Voltage: 12.47kV 5. Loss Adjustment Due To Meter Location: Yes 6_ Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes 8. Description of Facilities Installed and Owned by Each Party: Cooperative owns all equipment at this substation except for the following, which is owned by Company: • Company SCADA monitoring and operating equipment • Company's 138kV lines to Wesmer and La Palma connected to Cooperative's deadend structure in the station. 9. Operational Responsibilities of Each Party: Company operates MOS 388, MOS 387 and Circuit Switcher 383. Cooperative operates all remaining equipment at this station. 10. Maintenance Responsibilities of Each Party: Each Party is responsible for the maintenance of its own equipment. Cooperative will maintain the site including vegetation control. 11. Other Terms and Conditions: Company has access to the station with a lock in the entrance gate and access to the control house.

Issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 106 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 10 1 FERC Electric Tariff Third Revised Volume No. 6

STEC . AEP AEP STEC TO AEP 138kV 383 WESNER 0 do

TO AEP 138kV LA PALMAS

R 388 387

LINE TRAP

RG1o4 RC154

C.S. RG1 50

FUTURE EXPANSION

138/112.47k`\/ (YYY1 TRANSFORMER NO. 1

SOUTH TEXAS ELECTRIC COOPERATIVE, INC. DwG NC RC-IA

P O. BOX 119 NURSERY, TEXAS 77976 FACILITY SCHEDULE RANGERVILLE SUBSTATION 41 CAMERON COUNTY RANGERVIL.LE TIE ------^c - _._--. -^------I DWN. Bv JT CMD. 6/ nPPO. ET' _CALE j^f,q_ DATC 6^OH ^ ...... - -

issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12. 2010 107 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 102 FERC Electric Tariff, Third Revised Volume No. 6

FACILITY SCHEDULE NO. 42

1. Name: Rio Hondo 2. Facility Location: Company's Rio Hondo Switching Station west of Searcy Road and north of Rio Hondo, Cameron County 3. Voltage at Point of Interconnection: 138kV 4. Metered Voltage: 138kV, line monitoring meter 5. Loss Adjustment Due To Meter Location: No 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes 8. Description of Facilities Installed and Owned by Each Party: Company owns all equipment at this substation except for the following, which is owned by Cooperative: • Cooperative SCADA monitoring equipment • Fiber and radio communications equipment • Cooperative's 138 kV lines to Burns and East Rio Hondo connecting to Company's deadend structures in the station 9. Operational Responsibilities of Each Party: Company operates all equipment at this station. 10_ Maintenance Responsibilities of Each Party: Each Party is responsible for the maintenance of its own equipment. Company will maintain the site including vegetation control. 11. Other Terms and Conditions: Cooperative has access to the station with a lock in the entrance gate(s) and access to the control house.

Issued by: Richard E. MuneZinski, Senior Vice President Effective Date: February 19, 20t0 Regulatory Services Issued on: March 12. 2010 108 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 103 FERC Electric Tariff, Third Revised Volume No. 6

h('t, aG3 T 235 ;: 203' f TO HAR17NGEN 55 23W6 234 E 1 MOS 5258 & std L;B 5230 c^ 5235 > CCVT

tza ^ 67 ^ M ^ s€`;--t15 182 210 305

306 w vG 21G9 304 T4 3454`.' AUTO Xi'MR 3 SUS PT5 243 f86 ^ 67 715 ^^ C£?IT 242 -„'".3^ a _ _ st5 ^ 3 BUS ^--j^`^ PT'S #2-fi7-,- ^ t97-115 232 240 TO RRYbA0NI1VItt.E #2 241 2s9 CS 1035

so 50 T 329T WAR 3Sil330 215 345 375 WAR E---^ ^ n .•^3F° 3.3-? 2€6 214 344 346 376 r^^} TO LA Pe4Ltm!R 332 G"6 7340 & 7513 377 `92 115 57 247 CCVT

3Pr5 358 , `•-tt5 ._°."'^i^F=R-b7 2 AEPIsTEc ^-3613-AR 385 3CT -67 ! EAST RI0 HONDO 38ffi- 4 (CTEC) R CS R,2t3

EN11RE STATION OWNED & OPERATED BY AEP EXCEPT AS NOTED TEXAS CENTRAL COMPANY RIO HONDO SWITCHING STA. #1035 138KV ONE LINE DIAGRAM PP`D BY : DR. BY : #'tLC CH. SY : DLG I DATE : 12117/09 DISPATCHING I RIVERSIDE PLAZA COLUMBUS, Oh! 43215 DWG. No. 1085St302 IREV 4

Issued by: Richard E. Mtmczinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 109 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 104 FERC Electric Tariff. Third Revised Volume No. 6

FACILITY SCHEDULE NO. 43

1. Name: Weslaco Switching Station 2. Facility Location: Company's Weslaco Switching Station near the intersection of Mile 6 West and Minnesota Roads near Weslaco, Hidalgo County 3. Voltage at Point of Interconnection: 138kV 4_ Metered Voltage: 138kV, line monitoring meter 5. Normal Operation of Interconnection: Closed 6_ Loss Adjustment Due To Meter Location: No 7. One-Line Diagram Attached: Yes 8. Description of Facilities Installed and Owned by Each Party: Company installed and owns all equipment at this substation except for Cooperative's SCADA monitoring and control equipment and associated fiber and radio communications equipment. Cooperative owns the transmission lines to its Val Verde, Weslaco, and Gandy substations that connect to Company's deadend structures inside this station. 9. Operational Responsibilities of Each Party: • Cooperative operates Breaker 2070 and Breaker 2090. • Cooperative operates motor operated air switches 2092, 2097 and 2098. Company operates all remaining equipment at this station. 10. Maintenance Responsibilities of Each Party: Each Party is responsible for the maintenance of the equipment it owns_ Company will maintain the site including vegetation control. 11. Other Terms and Conditions: Cooperative has access to the station with a lock in the entrance gate(s) and access to the control house.

Issued by: Richard E_ Munczinski, Senior Vice President Effective Date- February 19, 2010 Regulatory Services Issued on: March 12, 2010 110 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 105 FERC Electric Tariff. Third Revised Volume No. 6

__...... _...... ^ . . . i

TO 4^m TO DUKE EDIN[iURG '093 2097 E: RIO HOND via t,.ETS STEC 2+r>'6-- i4esia.ro

2081 2£2k9 2076 2074 2069 2070 2077 2080-2 2€775

Bb 2085 2084 ^ 2091 2090 20:.. ^ TT a TO M44'EC ^ e G,AI^D3f FHARIi TO MVEC WkEM ' 2092 2098 ETEC`._^-.EP T T JkEP I STEC

2067

138/69 - 12.5KV 50/83 WA

\ 4019

4020

4021

69KV BUS

4211 43C91 ?754\ 374^} 4210 4i0v

_. .,dill ^-^^ 4214 4Et^4 J 42ti^9 4;.^99

69KV TO 69KV TO N. P HARR L Hk,RUNGEN RiCR 3150 SWITCHING STA. BKR 3260 TEXAS CENTRAL COMPANY WESLA CO SW STA SUP 111107:5 DRFT. CAS Er.G. I c^r;-^: s/23/O.^ .: 1t^i,,^.^001 E 3

Issued by: Richard E. Mtmezinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12. 2010 111 Operating Companies of the First Revised Sen ice Agreement No. 341 American Electric Power System Original Sheet No. 106 FERC Electric Tariff. Third Revised Volume Na 6

FACILITY SCHEDULE NO. 44

1. Name: Coffee Port 2_ Facility Location: Company's Coffee Port Substation on Coffee Port Road between Hwy 802 and Hwy 48 just north of Brownsville, Cameron County 3. Voltage at Point of Interconnection: 138kV 4_ Metered Voltage: 12.47kV 5. Loss Adjustment Due to Meter Location: Yes 6_ Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes 8. Description of Facilities Installed and Owned by Each Party: Company owns all equipment at this substation except for the following, which is owned by Cooperative: • SCADA monitoring, control equipment, and associated communications equipment • Cooperative's 138kV transmission lines to Hwy 511 and Central Avenue that are connected to Company's deadend structure in this station 9. Operational Responsibilities of Each Party: Both Parties may operate the capacitor bank air switch 6043 (AEP's 3446) which has dual lock capability. Cooperative operates MOAS 1073, MOAS 1077, and Switch 1083. Company operates all remaining equipment at this station. 10. Maintenance Responsibilities of Each Party: Each Party is responsible for the maintenance of its own equipment. Company will maintain the site including vegetation control. 11. Other Terms and Conditions: Cooperative has access to the station with a lock in the entrance gate(s) and access to the control house.

Issued by: Richard E. Munczinski. Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 112 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 107 FERC Electric Tariff, Third Revised Volume No. 6

TO MvEC TO tYi`JEC CENTRAL AVE. HWY 511 CB 5100 STEC CE? T1111 ..-°------_------;------__- AEP 1077 9073 28.8 M'AR 3446 3445 RVO BUS #2 BUS -41 CAP

1083 \ _.- (11 CiJT B0 99 73 604

1087

SMD-28/ 50 A

TRANSFORMER #1 Qh..V Z-1 7-5/9.375 MVA 0 55 C rvv, ^! 8, 4/10.5 MVA 0 65 C ^^ ^ TYIr`, 138j'=2A 7 Y/7.2 kVA 21= 8.7%

` 1(}8d

N.^.^0q3 ^

AEP MVEC 1098 ^ 1078 i072 S -S- 3-10 PT'S DUAL WINDING ;Z47kV MAIN BUS 6K

1J9h 1096 ;

1090 1095 :... _

1094 \

1092 'fl^7 N.C. TRANSFER BUS

12 KV FEEDER 12 KV FEEDER TO S. MINNESOTA RD. TO 802 & PADRE ISLAND RD. TEXAS CEIVrRAL COMPANY ^'OFFTEP^^R :^ .; t' fR # i 030 Nil' E DRFT.hf.S ENG. 1?LG APP. TAS DATE: 7123106 W.1 0130S00 f .,. . I . .. ^ ^ .^^ `` ^.^.^.

Issued by: Richard E. Munczinski. Senior Vice President Effective Date: February 19, 20I0 Regulatory Services Issued on: March 72. 2010 113 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 108 FERC Electric Tariff, Third Revised Volume No- 6

FACILITY SCHEDULE NO. 45

1. Name: F. Yturria 2_ Facility Location: Cooperative F. Yturria Substation at 113 CR 4132, Raymondville, Kenedy County approx. 11 miles north of Raymondville on Highway 77 3. Voltage at Point of Interconnection: 138kV 4. Metered Voltage: 12.47kV 5. Loss Adjustment Due To Meter Location: Yes 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes 8. Description of Facilities Installed and Owned by Each Party: Cooperative owns all equipment at this substation except for the following, which is owned by Company: • Radio communication equipment to communicate with Cooperative SCADA RTU • Company's 138kV transmission lines to Armstrong and Raymondville No. 2 connected to Cooperative's deadend structure in the station 9. Operational Responsibilities of Each Party: Company operates Switch 1329 and Switch 1339. Cooperative operates all remaining equipment at this station. 10. Maintenance Responsibilities of Each Party: Each Party is responsible for the maintenance of its own equipment_ Cooperative will maintain the site including vegetation control. 11. Other Terms and Conditions: Company has access to the station with a lock in the entrance gate(s) and access to the control house.

Issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on.- March 12, 2010 114 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 109 FERC Electric Tariff, Third Revised Volume No. 6

AEP STEC STEC AEP

AEP 138kV AEP 138kV ARMSTRONG 1329 1339 RAYMONDVILLE

. FYI 54

30E FUSE

TRANSFORMER 138kV-12.5/7.2kV

SOUTH TEXAS ELECTRIC COOPERATIVE, INC. D- .0 FY-1A

P.o. eoY, 119 NURSERY. TFXdS 77976 FACILITY SC^iEDuLE F. YTURRIA SUBSTATION 45 KENEDY COUNTY ^. YTURRIA TIE

aw^. er J- TncK 9r -_ nv?c n scaF NA tzlE 6/08

Issued by: Richard E_ Munezinski. Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 20i0 115 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 1 10 FERC Electric Tariff, Third Revised Volume No. 6

FACILITY SCHEDULE NO. 46

1. Name: Aderhold 2_ Facility Location: Cooperative's Aderhold Substation at 7318 East Mile 17 North, Edinburg, Hidalgo County near the intersection of Monte Cristo Road and Sharp Road near San Carlos. 3. Delivery Voltage: 138kV 4. Metered Voltage: 12.47kV 5_ Loss Adjustment Due To Meter Location: Yes 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: No 8_ Description of Facilities Installed and Owned by Each Party: Cooperative owns the 1.6 mile hairpin 138kV double circuit transmission line including the dead end structures in Company's North Edinburg - Elsa 138kV line to Cooperative's Aderhold Substation. Cooperative owns all equipment in the Aderhold Substation except for Company's radio equipment including antenna pole for communications with Cooperative's RTU. Company owns the 138kV transmission lines between Cooperative's deadend structure and the North Edinburg and Elsa Substations. Each Party will provide their own SCADA communication circuit from the Aderhold Substation to their respective control centers_ 9. Operational Responsibilities of Each Party: Each Party operates the facilities it owns with the exception that Company also operates 138kV breakers AD110 and AD120. 10. Maintenance Responsibilities of Each Party: Each Party maintains the facilities it owns with the exception that Company maintains the relays that protect the North Edinburg/HEC - Aderhold 138 kV transmission line and the Aderhold - Elsa 138 kV transmission line. 11. Other Terms and Conditions: Company has access to the station with a lock in the entrance gate(s) and access to the control house_

Issued by: Richard E. Mtmez.inski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 116 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. I 1 l FERC Electric Tariff- Third Revised Volume No. 6

1 38 kV AD! 12 GCB AD 1 1 3 TO NEC AD110 1.6 MILES AEP

STEC AD105

C.S. AD150

AD154

TRANSFORMER NO. 1 138/12.47 kV AD 123

GCB 1 AD1221

AD122

1.6 MILES

STFC

AEP

138 kV TO AEP ELSA

SOU -1 H TEXAS ELECTRIC COOPERATIVE, INC. - N- AD-IA

NURSERY, TEXAS 77976 P6 BOX 119 FACILITY SC-HEDJLE ADERHOLD SUBSTATION 46 HIDALGO COUN-FY _ ------ADERHOLD------,------T IE - DWN Fir J F KD $r APPD EY !.`,('ALE NA DATE r 6/08

Issued by: Richard E. Munczinski. Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 117 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 112 FERC Electric Tariff Third Revised Volume No. 6

FACILITY SCHEDULE NO. 47

1. Name: Greta Tie Line 2. Facility Location: Near Quintana Road and Hwy 59 intersection approx 1 I miles northeast of Refugio, Texas 3. Delivery Voltage: 12.47 kV 4. Metering Voltage: 12_47 kV 5. Loss Adjustment Due To Meter Location: Yes 6. Normal Operation of Interconnection : Closed 7. One-Line Diagram Attached: Not Applicable 8. Description of Facilities to be Installed and Owned by Each Party: Company originally installed all metering and isolation equipment including the pole at this distribution line metering point. Company owns the pole and the Company feeder conductors, crossarm, hardware, and the connections to the top of the isolation device. Cooperative owns all equipment mounted on the pole associated with metering and switching the tie point. Victoria Electric Cooperative owns the distribution equipment on the load side of this metering point. 9. Operational Responsibilities of Each Party: Company will operate those facilities it owns including the distribution line serving the tie point. Cooperative will operate the facilities it owns. Any switching shall be performed using good utility practice after informing the other party. 10. Maintenance Responsibilities of Each Party: Maintenance is the responsibility of the equipment owner. 11. Other Terms and Conditions: Company calculates the loss factor based upon resistances between this meter point and the ERCOT system.

Issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 118 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 113 FERC Electric Tariff. Third Revised Volume No. 6

FACILITY SCHEDULE NO. 48

1. Name: Capehart Tie Line 2_ Facility Location: Near S. Emily Drive and US 181 intersection on outskirts of Beeville, Texas 3. Delivery Voltage: 12.47 kV 4. Metering Voltage: 12.47 kV 5. Loss Adjustment Due To Meter Location: Yes 6. Normal Operation of Interconnection : Closed 7. One-Line Diagram Attached: Not Applicable 8. Description of Facilities to be Installed and Owned by Each Party: Company originally installed all metering and isolation equipment including the pole at this distribution line metering point. Company owns the pole and the Company supply feeder conductors, crossarm, hardware, and the connections to the top of the isolation device. Cooperative owns all equipment mounted on the pole associated with metering and switching the tie point_ San Patricio Electric Cooperative owns the distribution equipment on the load side of this metering point. 9. Operational Responsibilities of Each Party: The parties shall operate the facilities they own but shall keep each other informed of switching and outage operations. 10_ Maintenance Responsibilities of Each Party: Maintenance is the responsibility of the equipment owner. 11. Other Terms and Conditions: Company calculates the loss factor based upon resistances between this meter point and the ERCOT system.

Issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 20I0 Regulatory Services Issued on: March 12, 2010 119 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 114 FERC Electric Tariff Third Revised Volume No. 6

FACILITY SCHEDULE NO. 49

1. Name: Hi-Line 2. Facility Location: Cooperative Hi-Line Substation at 1121 W. Highline Road, Pharr, Hidalgo County 3. Delivery Voltage: 138 kV 4. Metered Voltage: 12.47 kV 5. Loss Adjustment Due To Meter Location: Yes 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes 8. Description of Facilities Installed and Owned by Each Party: Cooperative owns all equipment in the Hi-Line Substation with the exception of the following Company owned equipment: • Company's RTU and associated communications equipment • Company's I38kV lines to Hidalgo and Stewart Road that are connected to Cooperative's deadend structures 9. Operational Responsibilities of Each Party: Company operates the equipment it owns and circuit breakers 1270 and 6025. Cooperative operates the remaining equipment it owns. 10. Maintenance Responsibilities of Each Party: Each Party maintains the facilities it owns. 11. Other Terms and Conditions: Company has access to the station with a lock in the entrance gate(s) and access to the control house.

Issued by: Richard E. Mt.tnczinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 20-10 120 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 115 FERC Electric Tariff. Third Revised Volume No_ 6

GCB AEP 138kV TO HIDALGO 1270 AEP STEC 1269 1271

1-111 64

2103 1-11150 C.S.

H1154

138/ 13.2Y7.6:tV 6026 TRANSFORMER NO- 1

GCB 6025

2 6024 STEC

AEP

AEP 138kV T q STEWART ROAD

SOUTH TEXAS ELECTRIC COOPERATIVE, INC.

PO. BOX 1t9 HI-LINE 138kV STATION

HIDALGO COJ'4TY HI-LINE TIE

GwN 61 J T

Issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12. 20 10 121 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System First Revised Sheet No 116 FERC Electric Tariff, Third Revised Volume No. 6 Superseding Original Sheet No. 116

FACILITY SCHEDULE NO. 50

l. Name: Key 2. Facility Location: Company Key Switching Station on Mile 3 Road between Stewart and Bryan Roads approx. 5 miles northwest of McAllen in Palmhurst, Hidalgo County 3. Delivery Voltage: 138 kV 4. Metered Voltage: Not Applicable 5. Loss Adjustment Due To Meter Location: Not applicable 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes 8_ Description of Facilities Installed and Owned by Each Party: Company owns all equipment in its Key Switching Station with the exception of the following owned by Cooperative: • Cooperative 138kV line to Alton that connects to Company's deadend structure in the station • Cooperative RTU and associated communications equipment 9. Operational Responsibilities of Each Party: Each Party operates the facilities it owns except that Cooperative operates circuit breakers 1730, 1735, and 1740- 10. Maintenance Responsibilities of Each Party: Each Party maintains the facilities it awns. 11. Other Terms and Conditions: Cooperative has access to the station with a lock in the entrance gate(s) and access to the control house.

Issued by: Richard E. Munczinski, Senior Vice President Effective: March 29. 2010 Regulatory Services Issued on: April 28, 2010

122 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System First Revised Sheet No. 117 FERC Electric Tariff, Third Revised Volume No. 6 Superseding Original Sheet No. 117

CE 7735

SW 1736 to 0

Lj CO U CB 1740 1> 00^oa SW 1741 t, nQ^ r• to^^^ ^ 4^ SW 17r39 0 t-1

M 50KVA 3 CVTS M T SFASER rw r I SW 1742 i67vJ SW 1.74: (11 .x:vj ^ p MOS 1748

1:m KL' TO N. WALLEN :.b 63^z &, " B 5, 95

TEXAS CENTRAL COMPANY .KEY SWITCH -37A ir,/^)N NO. '078

GRFf.MC.S EI*1G.MC:S AC'P.TGV LATE:8/3OIt15 "'rr 1078-5001 ^ I tva v I Issued by: Richard E. Munczinski, Senior Vice President Effective: March 29. 2010 Regulatory Services Issued on- April 28, 2010

123 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 118 FERC Electric Tariff. Third Revised Volume No. 6

FACILITY SCHEDULE NO. 51

1. Name: Laureles 2. Facility Location: Cooperative Laureles Substation at 30064 Adams Road, San Benito, Cameron County 3. Delivery Voltage: 138 kV 4. Metered Voltage: 12.47 kV 5. Loss Adjustment Due To Meter Location: Yes 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: No 8. Description of Facilities Installed and Owned by Each Party: Cooperative installed and owns all equipment in the Laureles Substation with the exception of the following: Company's 138kV lines to La Palma and Port Isabel that connect to Cooperative's deadend structure in the station + Company's RTU and associated communications equipment 9. Operational Responsibilities of Each Party: Each Party operates the facilities it owns except that Company operates circuit breakers LA 110 and LA 120. - 10_ Maintenance Responsibilities of Each Party: Each Party maintains the facilities it owns- 11- Other Terms and Conditions: Company has access to the station with a lock in the entrance gate(s) and access to the control house_

Issued by: Richard E. Munczinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12. 2010 124 Operating Companies of the First Revised Service Agreement No. 34I American Electric Power System Original Sheet No. It 9 FERC Electric Tariff, Third Revised Volume No. b

GCB AEP 138kV TO LA PALMA LA110 LA112 LA113 AEPS T E C

C.S. LA 150

11 LA154

1 38/ 13.2Y7. 6kV TRANSFORMER NO. 1 LA 105

LA164

IA 123

GCB J LA120

LA1 22 STEC

AEP

AEP 138kV TO PORT ISABEL

LAURELES SUBSTATION CAMERON COUNTY

LAURELES TIE }

owN BY JT

Issued by: Richard E. Munczinski, Senior Vice President Effective Date: February I9, 20I0 Regulatory Services Issued on: March 12, 2010 125 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 120 FERC Electric Tariff, Third Revised Volume No. 6

FACILITY SCHEDULE NO. 52

1. Name: North Laredo 2_ Facility Location: Company's North Laredo Switching Station at 13434 IH 35, Laredo, Webb County 3. Delivery Voltage: 138 kV 4_ Metered Voltage: 24.94 kV 5. Loss Adjustment Due To Meter Location: Yes 6. Normal Operation of Interconnection: Closed 7. One-Line Diagram Attached: Yes.. 8. Description of Facilities Installed and Owned by Each Party: Company installed and owns all equipment in the North Laredo Switching Station including line breakers and associated equipment terminating Cooperative's 138kV line to its Botines Substation. Company installed and owns the jumpers from the Cooperative's tensioned conductor to the station equipment_ Cooperative installed and owns the 138 kV transmission line connecting Cooperative's Botines Station to the North Laredo Switching Station including the conductors to the Company's station deadend structure. 9. Operational Responsibilities of Each Party: Company operates all equipment and facilities it owns. Cooperative shall be allowed access to lock open and tag the air disconnect switch(es) that isolate its Botines - North Laredo 138kV transmission line- 10 . Maintenance Responsibilities of Each Party: Each Party maintains the facilities it owns. 11. Other Terms and Conditions Attached: Company shall provide Cooperative with SCADA information from the breakers associated with this Point of Interconnection from the North Laredo Switching Station via existing communications networks.

Issued by: Richard E. Mtmczinski. Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 126 Operating Companies of tlie First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 121 FERC Electric Tariff, Third Revised Volume No. 6

TO 1303 DILLEY SS CB 80 & CB 7825 (3) VIA ENCINAL & COTULLA CCVT

^ COMBO^^ UNIT T 1287-115V s ^c ^ ------^ 126"7V (3) TO OPERATE BOTINES ^ 7446 7444 TO (STEC) , CB 1440 9577- 7445 (SEE 7036SO01 ) CS-6111 (3) ^ ly, I f Ef 1 -_ STEG AEP co^ { ( ^ t # y fRI IuI t ^ { ^ to BU Li __1

10*s7-240V 1481 1479 TO I .-" - CS 1450 50 KVA 14$0 (SEE 7038SO01) STA. POWER PT #1 S^ (3) CCVT (A3R^R'^C^ `+' 3766 1257-115V ^ 1^B-67V BANK 1318 #1 3^ 28.8 MVAR TO LAREDO VFT NORTH ^7103 GE34260 &C89170 VIA MINES ROAD

ENTIRE STATION OWNED & OPERATED BY AEP EXCEPT AS NOTED TEXAS CENTRAL COMPANY NORTH LAREDO SW. STA. #7036 138KV APPD BY: PLW DR. BY: RLG CH. BY : TQT IDATE : 12i18/09 ONE LINE DIAGRAM DISPATCHING AMERICAN' 1 RlYERS/tW PLAL4 Woric Order #: ^ COLUMBUS, ON 43295 41182693 DWG. No. 7036S002

Issued by: Richard E. Munezinski, Senior Vice President Effective Date: February 19, 20f0 Regulatory Services Issued on: March 12, 2010 127 Operating Companies of the First Revised Service Agreement No. 341 American Electric Power System Original Sheet No. 122 FERC Electric Tariff, Third Revised Volume No. 6

FACILITY SCHEDULE NO. 53

I. Name: Franklins Camp 2. Facility Location: Cooperative Franklins Camp Substation at 5565 FM 2918, Churchill, Brazoria County 3. Delivery Voltage: not applicable 4_ Metering Voltage: 138 kV 5. Loss Adjustment Due To Meter Location: not applicable 6. Normal Operation of Interconnection: not applicable 7. One-Line Diagram Attached: not applicable 8. Description of Facilities to be Installed and Owned by Each Party: Company owns a revenue class meter along with associated wiring and isolation devices connected in parallel with Cooperative's meter on the Franklins Camp to Seaway 138kV transmission line_ Cooperative owns all other equipment at its Franklin's Camp Station. 9. Operational Responsibilities of Each Party: Company operates those facilities it owns. All operations by Company shall be coordinated with STEC using good utility practices. Cooperative will operate its facilities using good utility practices. 10. Maintenance Responsibilities of Each Party: Maintenance is the responsibility of the equipment owner_ 11. Other Terms and Conditions: Company shall make this meter's data available to Cooperative upon request in an approved format usable by Cooperative. Company is also responsible for the communications path to its meter that affects remote reading except for any part of the path that utilizes Cooperatives communications network. Any work on Cooperative communications equipment solely for Company's access to its meter shall be paid by the Company.

Issued by: Richard E. Munczinski, Senior Vice President Effective Date: February 19, 2010 Regulatory Services Issued on: March 12, 2010 128