Common use of SIGNATURE CLAUSE Clause in Contracts

SIGNATURE CLAUSE. Each Participant hereto represents and warrants that the person executing this Amendment No. 6 to the Navajo Project Co-Tenancy Agreement has been duly authorized to act on its behalf. This Amendment No. 6 to the Navajo Project Co-Tenancy Agreement is hereby executed as of the 26th day of july, 1999. UNITED STATES OF AMERICA Signature /s/ Robert W. Johnson ---------------------------------- Name Robert W. Johnson Regionxx Xxxxxxxx Lower Colorado Region Title U.S. Bureau of Reclamation Date Signed Jul 26 1999 ARIZONA PUBLIC SERVICE COMPANY Signature /s/ Jack Davis ---------------------------------- [STAMP] Name Jack Davis Title Executive Vixx Xxxxxxxnt Date Signed September 30, 1998 DEPARTMENT OF WATER AND POWER OF THE CITY OF LOS ANGELES by APPROVED AS TO FORM AND LEGALITY BOARD OF WATER AND POWER COMMISSIONERS JAMES K. HAHN CITY ATTORNEY OF THE CITY OF LOS ANGELES XXX 00 0000 By /s/ Kjehl T. Johansen By /s/ S. David Freeman ----------------------------- ----------------------------------------- KJEHL T JOHANSEN S. DAVID FREEMAN, General Manager Deputx Xxxx Xttorney and /s/ Authorized Signatory ---------------------------------------- Secretary Date Signed Authorized Signatory NEVADA POWER COMPANY Signature /s/ Steven W. Rigazio ---------------------------------- Name Steven W. Rigazio Title Vice Pxxxxxxxx, Xxxxxxx and Planning, Treasurer and CFO Date Signed October 15, 1998 SALT RIVER PROJECT AGRICULTURAL IMPROVEMENT AND POWER DISTRICT Signature /s/ Richard H. Silverman ---------------------------------- APPROVED AS TO FORM Name Richard H. Silverman SALT RIVER PROJECT LEGAL SERVICES By /s/ Autxxxxxxx Xxxxxxxxx Title General Manager ------------------------------ DATE 10-29-98 Date Signed December 18,1998 TUCSON ELECTRIC POWER COMPANY Signature /s/ T.A. Delawdev ---------------------------------- Name T.A. Delawdev Title Vice President EXHIBIT B-B, SHEET 1 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP [TRANSMISSION SYSTEM OWNERSHIP CHART] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 2 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP NAVAJO GENERATING STATION AND NAVAJO 500 kV SWITCHYARD [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 4 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP WESTWING SUBSTATION [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit D. Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 5 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP McCULLOUGH SUBSTATION [CIRCUIT DIAGXXX] *XXX holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit E. ***Ownership percentage calculation shown in Exhibit F. Note: The McCullough 230 kV switchyard and xxxxxxormer banks H.I and J are shown for information purposes only. Revised: 7/31/98 AutoCad BB-5 EXHIBIT B-B, SHEET 6 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP CRYSTAL SUBSTATION [CIRCUIT DIAGRAM] Legend: Termination ___ ___ Crystal 500 kV Switchyard Note: The Crystal 230 kV switchyard, the 500/230 kV transformers banks, and the 230 kV phase-shifting transformers are shown for information purposes only. Revised: 7/31/98 AutoCad EXHIBIT E McCULLOUGH 500 KV SWITCHYARD OWNERSHIP PERCENTAGES OWNERSHIP (%) ------------------------------ SRP FOR LOS UNITED DESCRIPTION OF TERMINATION ANGELES NEVADA STATES* ----------------------------- ------- ------- ------- Banks H and I 500 kV 0.00 50.00 50.00 Crystal-McCullough 48.90 26.10 00.00 Xxxx X 000 kV 71.67 28.33 0.00 McCullough-Victorville Line 1 100.00 0.00 0.00 XxCullough-Eldorado 100.00 0.00 0.00 XxCullough-Victorville Line 2 100.00 0.00 0.00 ------- ------- ------ TOTAL 420.57 104.43 75.00 Sum of Ownership Percentages: Los Angeles + Nevada + SRP for United States* = 420.57 + 104.43 + 75.00 = 600.00 Ownership percentages for the terminations in the McCullough 500 kV Switchyard are shown in the above table and are uxxx xxxxx to determine the ownership percentages for the McCullough 500 kV Switchyard infrastructure facilities such as, but xxx xxxxxed to, the busses, bus protection and metering, steel switchracks and associated concrete works, cable trenches and grounding. Los Angeles = (420.57/600.00) x 100% = 70.1% Nevada = (104.43/600.00) x 100% = 17.4% SRP for United States* = ( 75.00/600.00) x 100% = 12.5% * SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation).

SIGNATURE CLAUSE. Each Participant The signatories hereto represents and warrants represent that the person executing they have been appropriately authorized to enter into this Amendment No. 6 to 2 on behalf of the Navajo Project Co-Tenancy Agreement has been duly authorized to act on its behalfParticipants for whom they sign. This Amendment No. 6 to the Navajo Project Co-Tenancy Agreement 2 is hereby executed as of the 26th 14th day of julyJune, 19991996. UNITED STATES OF AMERICA Signature SIGNATURE /s/ Robert W. Johnson ---------------------------------- Name __________________________________ NAME Robert W. Johnson Regionxx Xxxxxxxx _______________________________________ Regional Director Lower Colorado Region Title TITLE U.S. Bureau of Reclamation Date Signed Jul 26 1999 DATE SIGNED March 3, 1996 ________________________________ ARIZONA PUBLIC SERVICE COMPANY Signature SIGNATURE /s/ Jack Davis ---------------------------------- [STAMP] Name Approved As To Form NAME Jack Davis Title Executive Vixx Xxxxxxxnt Date Signed September 30/s/ TE Parrish TITLE Vice Pxxxxxxxx Xate 6-00-00 DATE SIGNED June 14, 1998 1996 DEPARTMENT OF WATER AND POWER OF THE CITY OF LOS ANGELES by APPROVED AS TO FORM AND LEGALITY By BOARD OF WATER AND POWER COMMISSIONERS JAMES K. HAHN CITY ATTORNEY By /s/ Stanton J. Snyder OF THE CITY OF LOS ANGELES XXX 00 0000 ANCELES ----------------------- Stanton J. Snyder By /s/ Kjehl T. Johansen By /s/ S. David Freeman ----------------------------- ----------------------------------------- KJEHL T JOHANSEN S. DAVID FREEMAN, General Manager William R. Mc Carley Deputx Xxxx Xttorney Xxxxxxxx _________________________________________ Gerneral Manager and /s/ Authorized Signatory ---------------------------------------- Irene N. Kiski ________________________________________ Secretary Date Signed Authorized Signatory NEVADA POWER COMPANY Signature SIGNATURE /s/ Steven W. V. Rigazio ---------------------------------- Name __________________________________ NAME Steven W. V. Rigazio Title TITLE Vice Pxxxxxxxx, Xxxxxxx and Planning, Treasurer and CFO Date Signed October 15DATE SIGNED November 28, 1998 1995 SALT RIVER PROJECT AGRICULTURAL IMPROVEMENT AND POWER DISTRICT Signature SIGNATURE /s/ Richard H. Silverman ---------------------------------- APPROVED AS TO FORM Name Richard H. Silverman SALT RIVER PROJECT LEGAL SERVICES By /s/ Autxxxxxxx Xxxxxxxxx Title Mark B. Bonsall __________________________________ NAME Mark B. Bonsall _______________________________________ TITLE Associate General Manager ------------------------------ ______________________________________ DATE 10-29-98 Date Signed December 18,1998 SIGNED August 22, 1995 ________________________________ TUCSON ELECTRIC POWER COMPANY Signature (Formerly Tucson Gas & Electric Company) SIGNATURE /s/ T.A. Delawdev Steven J. Glaser ---------------------------------- Name T.A. Delawdev Title Vice President NAME Steven J. Glaser TITLE Vxxx Xxxxxxxxx DATE SIGNED July 31, 1995 EXHIBIT B-B, SHEET 1 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP [TRANSMISSION SYSTEM OWNERSHIP CHART] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad EXHIBIT B-B, B SHEET 2 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP NAVAJO GENERATING STATION AND NAVAJO 500 kV WESTWING 230kV SWITCHYARD CIRCUIT [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 4 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP WESTWING SUBSTATION [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit D. Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 5 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP McCULLOUGH SUBSTATION [CIRCUIT DIAGXXX] *XXX holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit E. ***Ownership percentage calculation shown in Exhibit F. Note: The McCullough 230 kV switchyard and xxxxxxormer banks H.I and J are shown for information purposes only. Revised: 7/31/98 AutoCad BB-5 EXHIBIT B-B, SHEET 6 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP CRYSTAL SUBSTATION [CIRCUIT DIAGRAM] Legend: Termination ___ ___ Crystal 500 kV Switchyard Note: The Crystal 230 kV switchyard, the 500/230 kV transformers banks, and the 230 kV phase-shifting transformers are shown for information purposes only. Revised: 7/31/98 AutoCad EXHIBIT E McCULLOUGH 500 KV SWITCHYARD OWNERSHIP PERCENTAGES OWNERSHIP (%) ------------------------------ SRP FOR LOS UNITED DESCRIPTION OF TERMINATION ANGELES NEVADA STATES* ----------------------------- ------- ------- ------- Banks H and I 500 kV 0.00 50.00 50.00 Crystal-McCullough 48.90 26.10 00.00 Xxxx X 000 kV 71.67 28.33 0.00 McCullough-Victorville Line 1 100.00 0.00 0.00 XxCullough-Eldorado 100.00 0.00 0.00 XxCullough-Victorville Line 2 100.00 0.00 0.00 ------- ------- ------ TOTAL 420.57 104.43 75.00 Sum of Ownership Percentages: Los Angeles + Nevada + SRP for United States* = 420.57 + 104.43 + 75.00 = 600.00 Ownership percentages for the terminations in the McCullough 500 kV Switchyard are shown in the above table and are uxxx xxxxx to determine the ownership percentages for the McCullough 500 kV Switchyard infrastructure facilities such as, but xxx xxxxxed to, the busses, bus protection and metering, steel switchracks and associated concrete works, cable trenches and grounding. Los Angeles = (420.57/600.00) x 100% = 70.1% Nevada = (104.43/600.00) x 100% = 17.4% SRP for United States* = ( 75.00/600.00) x 100% = 12.5% * SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation).FLOW CHART]

SIGNATURE CLAUSE. Each Participant hereto represents and warrants that the person executing this Amendment No. 6 8 to the Navajo Project Co-Tenancy Southern Transmission System Operating Agreement has been duly authorized to act on its behalf. This Amendment No. 6 8 to the Navajo Project Co-Tenancy Southern. Transmission System Operating Agreement is hereby executed as of the 26th day of july, 19992016. UNITED STATES OF AMERICA Signature /s/ Robert W. Johnson ---------------------------------- Name Robert W. Johnson Regionxx Xxxxxxxx t o s w f v XXXXXXXX, FEU ER, RCMITY AT LEG^L(TY Title Regional Director Lower Colorado Region Title U.S. Bureau of Reclamation E I BY WM3. Date Signed Jul 26 1999 j ' " XXXXX DRiSCOi.: i DEPUTY CITY ATTOrTNeV ARIZONA PUBLIC SERVICE COMPANY Signature /s/ Jack Davis ---------------------------------- [STAMP] Name Jack Davis , Title Executive Vixx Xxxxxxxnt Date Signed September 30, 1998 DEPARTMENT OF WATER AND POWER OF THE CITY OF LOS ANGELES by APPROVED AS TO FORM AND LEGALITY BY BOARD OF WATER AND WATER'AND POWER COMMISSIONERS JAMES K. HAHN CITY ATTORNEY OF THE CITY OF LOS ANGELES XXX 00 0000 By /s/ Kjehl T. Johansen By /s/ S. David Freeman ----------------------------- ----------------------------------------- KJEHL T JOHANSEN S. DAVID FREEMAN, By: ' XXXXXX X. XXXXX General Manager Deputx Xxxx Xttorney and /s/ Authorized Signatory ---------------------------------------- Chief Engineer Date: And: XXXXX X. XXXXXXXXX Secretary NEVADA POWER COMEANY Signature Name Title Date Signed Authorized Signatory NEVADA POWER COMPANY Signature /s/ Steven W. Rigazio ---------------------------------- Name Steven W. Rigazio Title Vice PxxxxxxxxMay li, Xxxxxxx and Planning, Treasurer and CFO Date Signed October 15, 1998 Zor7 SALT RIVER PROJECT AGRICULTURAL IMPROVEMENT AND POWER DISTRICT Signature /s/ Richard H. Silverman ---------------------------------- APPROVED AS TO FORM Name Richard H. Silverman SALT RIVER PROJECT LEGAL SERVICES By /s/ Autxxxxxxx Xxxxxxxxx Title General Manager ------------------------------ DATE 10-29-98 Date Signed December 18,1998 TUCSON ELECTRIC POWER COMPANY Signature /s/ T.A. Delawdev ---------------------------------- Name T.A. Delawdev Title Vice President Date Signed 26 NEVADA POWER COMPANY Signature Name Title Date Signed ! SALT RIVER PROJECT AGRICULTURAL j IMPROVEMENT. AND POWER DISTRICT Signature Name ;i m Xxxxxxx X. Xxxxxx i ii Title Sr. Director, Power Generation Date Signed $r- is-zon l TUCSON ELECTRIC POWER COMPANY Signature Name Title r Date Signed 6 i \ li 1 I 1t NEVADA POWER COMPANY Signature Name Title Date Signed SALT RIVER PROJECT AGRICULTURAL S IMPROVEMENT AND POWER DISTRICT i Signature Name Title Date Signed :| TUCSON ELECTRIC POWER CORPANi Signature Name Title l/ F* $4Lh.0\jVtU Date Signed ^/'xlt n [ EXHIBIT B-B, SHEET 1 NAVAJO PROJECT CO-TENANCY AGREEMENT A COMPONENTS OF THE SOUTHERN TRANSMISSION SYSTEM OWNERSHIP [The SOUTHERN TRANSMISSION SYSTEM OWNERSHIP CHART] *SRP holds title for the use and benefit shall consist of the United States, Department following Components of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 2 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP NAVAJO GENERATING STATION AND NAVAJO 500 kV SWITCHYARD [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 4 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP WESTWING SUBSTATION [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit D. Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 5 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP McCULLOUGH SUBSTATION [CIRCUIT DIAGXXX] *XXX holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit E. ***Ownership percentage calculation shown in Exhibit F. Note: The McCullough 230 kV switchyard and xxxxxxormer banks H.I and J are shown for information purposes only. Revised: 7/31/98 AutoCad BB-5 EXHIBIT B-B, SHEET 6 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP CRYSTAL SUBSTATION [CIRCUIT DIAGRAM] Legend: Termination ___ ___ Crystal 500 kV Switchyard Note: The Crystal 230 kV switchyard, the 500/230 kV transformers banks, and the 230 kV phase-shifting transformers are shown for information purposes only. Revised: 7/31/98 AutoCad EXHIBIT E McCULLOUGH 500 KV SWITCHYARD OWNERSHIP PERCENTAGES OWNERSHIP (%) ------------------------------ SRP FOR LOS UNITED DESCRIPTION OF TERMINATION ANGELES NEVADA STATES* ----------------------------- ------- ------- ------- Banks H and I 500 kV 0.00 50.00 50.00 Crystal-McCullough 48.90 26.10 00.00 Xxxx X 000 kV 71.67 28.33 0.00 McCullough-Victorville Line 1 100.00 0.00 0.00 XxCullough-Eldorado 100.00 0.00 0.00 XxCullough-Victorville Line 2 100.00 0.00 0.00 ------- ------- ------ TOTAL 420.57 104.43 75.00 Sum of Ownership Percentages: Los Angeles + Nevada + SRP for United States* = 420.57 + 104.43 + 75.00 = 600.00 Ownership percentages for the terminations in the McCullough 500 kV Switchyard are shown in the above table and are uxxx xxxxx to determine the ownership percentages for the McCullough 500 kV Switchyard infrastructure facilities such as, but xxx xxxxxed to, the busses, bus protection and metering, steel switchracks and associated concrete works, cable trenches and grounding. Los Angeles = (420.57/600.00) x 100% = 70.1% Nevada = (104.43/600.00) x 100% = 17.4% SRP for United States* = ( 75.00/600.00) x 100% = 12.5% * SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation).Transmission System:

SIGNATURE CLAUSE. Each Participant hereto represents and warrants that the person executing this Amendment No. 6 8 to the Navajo Project Co-Tenancy Southern Transmission System Operating Agreement has been duly authorized to act on its behalf. This Amendment No. 6 8 to the Navajo Project Co-Tenancy Southern. Transmission System Operating Agreement is hereby executed as of the 26th day of july, 19992016. UNITED STATES OF AMERICA Signature /s/ Robert W. Johnson ---------------------------------- Name Robert W. Johnson Regionxx Xxxxxxxx t o s w f v MICKAELN, FEU ER, RCMITY AT LEG^L(TY Title Regional Director Lower Colorado Region Title U.S. Bureau of Reclamation E I BY WM3. Date Signed Jul 26 1999 j ' " XXXXX DRiSCOi.: i DEPUTY CITY ATTOrTNeV ARIZONA PUBLIC SERVICE COMPANY Signature /s/ Jack Davis ---------------------------------- [STAMP] Name Jack Davis , Title Executive Vixx Xxxxxxxnt Date Signed September 30, 1998 DEPARTMENT OF WATER AND POWER OF THE CITY OF LOS ANGELES by APPROVED AS TO FORM AND LEGALITY BY BOARD OF WATER AND WATER'AND POWER COMMISSIONERS JAMES K. HAHN CITY ATTORNEY OF THE CITY OF LOS ANGELES XXX 00 0000 By /s/ Kjehl T. Johansen By /s/ S. David Freeman ----------------------------- ----------------------------------------- KJEHL T JOHANSEN S. DAVID FREEMAN, By: ' XXXXXX X. XXXXX General Manager Deputx Xxxx Xttorney and /s/ Authorized Signatory ---------------------------------------- Chief Engineer Date: And: XXXXX X. XXXXXXXXX Secretary NEVADA POWER COMEANY Signature Name Title Date Signed Authorized Signatory NEVADA POWER COMPANY Signature /s/ Steven W. Rigazio ---------------------------------- Name Steven W. Rigazio Title Vice PxxxxxxxxMay li, Xxxxxxx and Planning, Treasurer and CFO Date Signed October 15, 1998 Zor7 SALT RIVER PROJECT AGRICULTURAL IMPROVEMENT AND POWER DISTRICT Signature /s/ Richard H. Silverman ---------------------------------- APPROVED AS TO FORM Name Richard H. Silverman SALT RIVER PROJECT LEGAL SERVICES By /s/ Autxxxxxxx Xxxxxxxxx Title General Manager ------------------------------ DATE 10-29-98 Date Signed December 18,1998 TUCSON ELECTRIC POWER COMPANY Signature /s/ T.A. Delawdev ---------------------------------- Name T.A. Delawdev Title Vice President Date Signed 26 NEVADA POWER COMPANY Signature Name Title Date Signed ! SALT RIVER PROJECT AGRICULTURAL j IMPROVEMENT. AND POWER DISTRICT Signature Name ;i m Xxxxxxx X. Xxxxxx i ii Title Sr. Director, Power Generation Date Signed $r- is-zon l TUCSON ELECTRIC POWER COMPANY Signature Name Title r Date Signed 6 i \ li 1 I 1t NEVADA POWER COMPANY Signature Name Title Date Signed SALT RIVER PROJECT AGRICULTURAL S IMPROVEMENT AND POWER DISTRICT i Signature Name Title Date Signed :| TUCSON ELECTRIC POWER CORPANi Signature Name Title l/ F* $4Lh.0\jVtU Date Signed ^/'xlt n [ EXHIBIT B-B, SHEET 1 NAVAJO PROJECT CO-TENANCY AGREEMENT A COMPONENTS OF THE SOUTHERN TRANSMISSION SYSTEM OWNERSHIP [The SOUTHERN TRANSMISSION SYSTEM OWNERSHIP CHART] *SRP holds title for the use and benefit shall consist of the United States, Department following Components of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 2 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP NAVAJO GENERATING STATION AND NAVAJO 500 kV SWITCHYARD [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 4 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP WESTWING SUBSTATION [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit D. Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 5 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP McCULLOUGH SUBSTATION [CIRCUIT DIAGXXX] *XXX holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit E. ***Ownership percentage calculation shown in Exhibit F. Note: The McCullough 230 kV switchyard and xxxxxxormer banks H.I and J are shown for information purposes only. Revised: 7/31/98 AutoCad BB-5 EXHIBIT B-B, SHEET 6 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP CRYSTAL SUBSTATION [CIRCUIT DIAGRAM] Legend: Termination ___ ___ Crystal 500 kV Switchyard Note: The Crystal 230 kV switchyard, the 500/230 kV transformers banks, and the 230 kV phase-shifting transformers are shown for information purposes only. Revised: 7/31/98 AutoCad EXHIBIT E McCULLOUGH 500 KV SWITCHYARD OWNERSHIP PERCENTAGES OWNERSHIP (%) ------------------------------ SRP FOR LOS UNITED DESCRIPTION OF TERMINATION ANGELES NEVADA STATES* ----------------------------- ------- ------- ------- Banks H and I 500 kV 0.00 50.00 50.00 Crystal-McCullough 48.90 26.10 00.00 Xxxx X 000 kV 71.67 28.33 0.00 McCullough-Victorville Line 1 100.00 0.00 0.00 XxCullough-Eldorado 100.00 0.00 0.00 XxCullough-Victorville Line 2 100.00 0.00 0.00 ------- ------- ------ TOTAL 420.57 104.43 75.00 Sum of Ownership Percentages: Los Angeles + Nevada + SRP for United States* = 420.57 + 104.43 + 75.00 = 600.00 Ownership percentages for the terminations in the McCullough 500 kV Switchyard are shown in the above table and are uxxx xxxxx to determine the ownership percentages for the McCullough 500 kV Switchyard infrastructure facilities such as, but xxx xxxxxed to, the busses, bus protection and metering, steel switchracks and associated concrete works, cable trenches and grounding. Los Angeles = (420.57/600.00) x 100% = 70.1% Nevada = (104.43/600.00) x 100% = 17.4% SRP for United States* = ( 75.00/600.00) x 100% = 12.5% * SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation).Transmission System:

SIGNATURE CLAUSE. Each Participant The signatories hereto represents and warrants represent that the person executing they have been appropriately authorized to enter into this Amendment No. 6 to 3 on behalf of the Navajo Project Co-Tenancy Agreement has been duly authorized to act on its behalfParticipants for whom they sign. This Amendment No. 6 to the Navajo Project Co-Tenancy Agreement 3 is hereby executed as of the 26th 11th day of julyFebruary, 19991997. UNITED STATES OF AMERICA Signature SIGNATURE /s/ Robert W. Johnson ---------------------------------- Name Robert W. Johnson Regionxx Xxxxxxxx Authorized Signatory ----------------------------- NAME___________________________________ TITLE Regional Director Lower Colorado Region Title U.S. Bureau of Reclamation Date Signed Jul 26 1999 DATE SIGNED____________________________ ARIZONA PUBLIC SERVICE COMPANY Signature SIGNATURE /s/ Jack Davis ---------------------------------- Authorized Signatory [STAMP] Name Jack Davis Title Executive Vixx Xxxxxxxnt Date Signed September 30, 1998 ------------------------------ NAME___________________________________ TITLE__________________________________ DATE SIGNED____________________________ APS CONTRACT NO. 48178 DEPARTMENT OF WATER AND POWER OF THE CITY OF LOS ANGELES by APPROVED AS TO FORM AND LEGALITY By [STAMP] BOARD OF WATER AND POWER COMMISSIONERS JAMES K. HAHN CITY ATTORNEY OF THE CITY OF LOS ANGELES XXX 00 0000 By /s/ Kjehl T. Johansen By /s/ S. David Freeman ----------------------------- ----------------------------------------- KJEHL T JOHANSEN S. DAVID FREEMAN, General Manager Deputx Xxxx Xttorney Authorized Signatory --------------------------------- GENERAL MANAGER and /s/ Authorized Signatory ---------------------------------------- --------------------------------- Secretary Date Signed Authorized Signatory NEVADA POWER COMPANY Signature SIGNATURE /s/ Steven W. Rigazio ---------------------------------- Name ----------------------------- NAME Steven W. Rigazio Title TITLE Vice PxxxxxxxxXxxxxxxxx, Xxxxxxx Xxxxxce and Planning, Treasurer and CFO Date Signed October 15DATE SIGNED June 21, 1998 1996 [STAMP] SALT RIVER PROJECT AGRICULTURAL IMPROVEMENT AND POWER DISTRICT Signature SIGNATURE /s/ Richard H. Silverman ---------------------------------- APPROVED AS TO FORM Name Richard H. Silverman SALT RIVER PROJECT LEGAL SERVICES By /s/ Autxxxxxxx Xxxxxxxxx Title General Manager Mark B. Bonsall ------------------------------ NAME Mark B. Bonsall TITLE Associxxx Xxxxxxx Xxxager DATE 10-29-98 Date Signed December 18,1998 SIGNED July 25, 1996 APS CONTRACT NO. 48178 TUCSON ELECTRIC POWER COMPANY Signature (Formerly Tucson Gas & Electric Company) SIGNATURE: /s/ T.A. Delawdev ---------------------------------- Name T.A. Delawdev Title Vice President Steven J. Glaser ----------------------------- NAME Steven J. Glaser TITLE Xxxx Xxxxxxxxx DATE SIGNED February 23, 1996 EXHIBIT B-B, B SHEET 1 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP [TRANSMISSION SYSTEM OWNERSHIP CHART] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation)APS CONTRACT NO. Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 2 51763 XXX Xx. 00000 XXXXXXXXX XX. 0 TO THE NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP NAVAJO GENERATING STATION AND NAVAJO 500 kV SWITCHYARD [CIRCUIT DIAGRAM] *SRP holds title By Federal Energy Regulatory Commission ("FERC") order/ notice of acceptance dated _____ . in FERC Docket No. _________, this Amendment No. 4 was accepted for filing and the use and benefit of the United Statesrate schedules became effective on __________________, Department of the Interior (Bureau of Reclamation)19_____. Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET Execution Original APS CONTRACT NO. 51763 AMENDMENT NO. 4 TO THE NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP WESTWING SUBSTATION [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation)TABLE OF CONTENTS 1 PARTIES: .......................................................... 1 2 RECITALS: ......................................................... 1 3 AMENDMENTS: ....................................................... 3 4 EFFECT: ........................................................... 4 5 EXECUTION AND EFFECTIVE DATE: ..................................... 4 6 SIGNATURE CLAUSE: ................................................. 6 APS CONTRACT NO. **Ownership percentage calculation shown in Exhibit D. Revised: 7/31/98 AutoCad EXHIBIT B-B, SHEET 5 51763 AMENDMENT NO. 4 TO THE NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP McCULLOUGH SUBSTATION [CIRCUIT DIAGXXX] *XXX holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit E. ***Ownership percentage calculation shown in Exhibit F. Note: The McCullough 230 kV switchyard and xxxxxxormer banks H.I and J are shown for information purposes only. Revised: 7/31/98 AutoCad BB-5 EXHIBIT B-B, SHEET 6 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP CRYSTAL SUBSTATION [CIRCUIT DIAGRAM] Legend: Termination ___ ___ Crystal 500 kV Switchyard Note: The Crystal 230 kV switchyard, the 500/230 kV transformers banks, and the 230 kV phase-shifting transformers are shown for information purposes only. Revised: 7/31/98 AutoCad EXHIBIT E McCULLOUGH 500 KV SWITCHYARD OWNERSHIP PERCENTAGES OWNERSHIP (%) ------------------------------ SRP FOR LOS UNITED DESCRIPTION OF TERMINATION ANGELES NEVADA STATES* ----------------------------- ------- ------- ------- Banks H and I 500 kV 0.00 50.00 50.00 Crystal-McCullough 48.90 26.10 00.00 Xxxx X 000 kV 71.67 28.33 0.00 McCullough-Victorville Line 1 100.00 0.00 0.00 XxCullough-Eldorado 100.00 0.00 0.00 XxCullough-Victorville Line 2 100.00 0.00 0.00 ------- ------- ------ TOTAL 420.57 104.43 75.00 Sum of Ownership Percentages: Los Angeles + Nevada + SRP for United States* = 420.57 + 104.43 + 75.00 = 600.00 Ownership percentages for the terminations in the McCullough 500 kV Switchyard are shown in the above table and are uxxx xxxxx to determine the ownership percentages for the McCullough 500 kV Switchyard infrastructure facilities such as, but xxx xxxxxed to, the busses, bus protection and metering, steel switchracks and associated concrete works, cable trenches and grounding. Los Angeles = (420.57/600.00) x 100% = 70.1% Nevada = (104.43/600.00) x 100% = 17.4% SRP for United States* = ( 75.00/600.00) x 100% = 12.5% * SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation).AGREEMENT

SIGNATURE CLAUSE. Each Participant hereto represents and warrants that the person executing this Amendment No. 6 5 to the Navajo Project Co-Tenancy Agreement has been duly authorized to act on its behalf. This Amendment No. 6 5 to the Navajo Project Co-Tenancy Agreement is hereby executed as of the 26th 4th day of julySeptember, 19991998. UNITED STATES OF AMERICA Signature /s/ Robert W. Johnson ---------------------------------- LeGrand Neilson --------------------------------- Name Robert W. Johnson Regionxx LeGrand Neilson Regioxxx Xxxxxxxx ACTING FOR Lower Colorado Region Title U.S. Bureau of Reclamation Date Signed Jul 26 1999 September 4, 1998 ARIZONA PUBLIC SERVICE COMPANY [STAMP] Signature /s/ Jack Davis ---------------------------------- [STAMP] Name Jack Davis Title Executive Vixx Xxxxxxxnt X. X. Commercial Operation Date Signed September 30, 1998 3/16/98 [ILLEGIBLE] DEPARTMENT OF WATER AND POWER OF THE CITY OF LOS ANGELES by BOARD OF WATER AND POWER COMMISSIONERS OF THE CITY OF LOS ANGELES APPROVED AS TO FORM AND LEGALITY BOARD OF WATER AND POWER COMMISSIONERS By /s/ Authorized Signatory JAMES K. HAHN CITY ATTORNEY OF THE CITY OF LOS ANGELES XXX 00 0000 By /s/ Kjehl T. Johansen By /s/ S. David Freeman ----------------------------- ----------------------------------------- KJEHL T JOHANSEN S. DAVID FREEMAN, General Manager Deputx Xxxx Xttorney MAY 13 1998 and /s/ Authorized Signatory By /s/ Kjehl T. Johansen ---------------------------------------- --------------------------------- Secretary KJEHL T JOHANSEN DEPUTY CITY ATTORNEY Date Signed Authorized Signatory Jun 16 1000 NEVADA POWER COMPANY Signature /s/ Steven W. Rigazio Authorized Signatory ---------------------------------- Name Steven W. Rigazio Authorized Signatory Title Vice PxxxxxxxxPresident, Xxxxxxx Finance and Planning, Treasurer and CFO Date Signed October 15, 1998 2/26/98 SALT RIVER PROJECT AGRICULTURAL IMPROVEMENT AND POWER DISTRICT Signature /s/ Richard H. Silverman ---------------------------------- APPROVED AS TO FORM Name Richard H. Silverman SALT RIVER PROJECT LEGAL SERVICES Signature /s/ Mark B. Bonsall [ILLEGIBLE] --------------------------------- By /s/ Autxxxxxxx Xxxxxxxxx Authorized Signatory Name Mark B. Bonsall ------------------------ DATE 2.13.98 Title Associate General Manager ------------------------------ DATE 10-29-98 Date Signed December 18,1998 02/20/98 TUCSON ELECTRIC POWER COMPANY Signature /s/ T.A. Delawdev ---------------------------------- Authorized Signatory -------------------------------- Name T.A. Delawdev T. A. Authorized Signatory Title Vice President EXHIBIT B-B, SHEET 1 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP [TRANSMISSION SYSTEM OWNERSHIP CHART] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad BB-1 EXHIBIT B-B, SHEET 2 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP NAVAJO GENERATING STATION AND NAVAJO 500 kV KV SWITCHYARD [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United StatesBB-2 EXHIBIT B-B, Department of the Interior (Bureau of Reclamation). Revised: 7/31/98 AutoCad SHEET 3 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP MOENKOPI 500 KV SWITCHYARD AND YAVAPAI 500 KV SWITCHYARD [CIRCUIT DIAGRAM] BB-3 EXHIBIT B-B, SHEET 4 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP WESTWING SUBSTATION [CIRCUIT DIAGRAM] *SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit D. Revised: 7/31/98 AutoCad BB-4 EXHIBIT B-B, SHEET 5 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP McCULLOUGH SUBSTATION [CIRCUIT DIAGXXX] *XXX holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation). **Ownership percentage calculation shown in Exhibit E. ***Ownership percentage calculation shown in Exhibit F. Note: The McCullough 230 kV switchyard and xxxxxxormer banks H.I and J are shown for information purposes only. Revised: 7/31/98 AutoCad BB-5 EXHIBIT B-B, SHEET 6 NAVAJO PROJECT CO-TENANCY AGREEMENT TRANSMISSION SYSTEM OWNERSHIP CRYSTAL SUBSTATION [CIRCUIT DIAGRAM] Legend: Termination ___ ___ Crystal 500 kV Switchyard Note: The Crystal D ORIGINAL WESTWING 230 kV switchyard, the 500/230 kV transformers banks, and the 230 kV phase-shifting transformers are shown for information purposes only. Revised: 7/31/98 AutoCad EXHIBIT E McCULLOUGH 500 KV SWITCHYARD (INCLUDING COMMON FACILITIES) OWNERSHIP PERCENTAGES OWNERSHIP (%) ------------------------------ ---------------------------------------- SRP FOR LOS UNITED DESCRIPTION OF TERMINATION ANGELES NEVADA STATES* ----------------------------- ARIZONA SRP UNITED STATES(1) --------------------------------- ------- ----- ---------------- 500/230 kV Transformer Bank T1(2) 28.5 44.2 27.3 500/230 kV Transformer Bank T4(2) 28.5 44.2 27.3 Westwing- Pinnacle Peak 0.0 100.0 0.0 Westwing-Agua Fria 0.0 100.0 0.0 Westwing- Pinnacle Peak 0.0 0.0 100.0 Westwing- Liberty 0.0 0.0 100.0 Westwing-Surprise 100.0 0.0 0.0 Westwing-APS (future) 100.0 0.0 0.0 ------- ------- Banks H and I 500 kV 0.00 50.00 50.00 Crystal-McCullough 48.90 26.10 00.00 Xxxx X 000 kV 71.67 28.33 0.00 McCullough-Victorville Line 1 100.00 0.00 0.00 XxCullough-Eldorado 100.00 0.00 0.00 XxCullough-Victorville Line 2 100.00 0.00 0.00 ------- ------- ------ ----- --------- TOTAL 420.57 104.43 75.00 257.0 288.4 254.6 Sum of Ownership Percentages: Los Angeles Arizona + Nevada SRP + SRP for United States* States(1) = 420.57 257.0 + 104.43 288.4 + 75.00 254.6 = 600.00 800.0 Ownership percentages for the terminations in the McCullough 500 original Westwing 230 kV Switchyard (including common facilities) are shown in the above table and are uxxx xxxxx used below to determine the ownership percentages for the McCullough 500 original Westwing 230 kV Switchyard (including common facilities) infrastructure facilities such as, but xxx xxxxxed not limited to, the busses, bus protection and metering, steel switchracks and associated concrete works, cable trenches and grounding. Los Angeles Arizona = (420.57/600.00257.0/800.0) x 100% = 70.132.1% Nevada SRP = (104.43/600.00288.4/800.0) x 100% = 17.436.1% SRP for United States* States(1) = ( 75.00/600.00(254.6/800.0) x 100% = 12.5% * SRP holds title for the use and benefit of the United States, Department of the Interior (Bureau of Reclamation).31.8%