Document:

Amendment No. 1 to Contract for Services

 Exhibit 10(aa) 
 AMENDMENT NO. 1 TO CONTRACT FOR SERVICES 
 This Amendment No. 1
to Contract for Services (the “Amendment”), effective as of August 16, 2011, is made by and between Oncor Electric Delivery Company LLC (“Company”) and Rob D. Trimble III (“Executive”) and amends that
certain Contract for Services (the “Agreement”), dated as of April 1, 2010, by and between the Company and Executive. Undefined capitalized terms used herein shall have the meanings given them in the Agreement. 

In consideration of the promises and mutual agreements in this Amendment, and for other good and valuable consideration, the receipt and
legal sufficiency of which are hereby acknowledged, the parties agree as follows: 
 1. Amendments. 

A. Section 1.1. of the Agreement is hereby amended and restated in its entirety to read as follows: 

“The term of this Agreement is for a three (3) year period commencing on April 1, 2010 and, unless otherwise terminated in
accordance with the provisions of Section 1.9 hereof, terminating on March 31, 2013 (the “Term”).” 
 B. Section 1.5 of the Agreement is hereby amended and restated in its entirety to read as follows: 
 “During the Term, in consideration of Executive’s being available to perform and, when requested by the Company, performing the Services contained in the Agreement, the Company shall pay
Executive a yearly retainer (the “Yearly Retainer”) of one hundred fifty thousand dollars ($150,000.00) in the first year and seventy-five thousand dollars ($75,000.00) in the second and third years which shall be paid at a time
mutually agreed between Executive and the Services Administrator.” 
 C. Section 3.6 of the Agreement is hereby amended
to replace the Company’s address for notices with the following: Oncor Electric Delivery Company, 1616 Woodall Rodgers Freeway, Dallas, Texas 75202, Attn: Debra L. Elmer. 
 2. Entirety of Agreement. The Agreement, as amended by this Amendment, constitutes the entire agreement between the parties hereto with respect to the subject matter hereof and supersedes
and replaces any and all prior negotiations, undertakings, understandings, or agreements (whether written or oral). Except as expressly set forth herein, this Amendment shall not alter, amend, modify or otherwise affect the terms, provisions and
conditions of the Agreement, all of which remain in full force and effect. 
 [SIGNATURE PAGE FOLLOWS] 

  
 1 

 IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the date first
written above. 
  

									
	EXECUTIVE	 		 	 ONCOR ELECTRIC DELIVERY
 COMPANY LLC

				
	/s/ Rob D. Trimble, III	 		 	By:	 	/s/ Debra L. Elmer
	Rob D. Trimble, III	 		 		 	Debra L. Elmer
		 		 		 	Senior Vice President, Human Resources

  
 2Amendment No. 1 to Revolving Credit Agreement

 Exhibit 10(cc) 

AMENDMENT No. 1, dated as of August 4, 2011 (this “Amendment”), to that certain Revolving Credit
Agreement, dated as of October 10, 2007 (the “Agreement”), by and among Oncor Electric Delivery Company LLC (the “Borrower”), the lending institutions from time to time parties thereto (each a
“Lender” and, collectively, the “Lenders”), JPMorgan Chase Bank, N.A. (“JPMorgan Chase”), as administrative agent for the Lenders (in such capacity, the “Agent”), Citibank, N.A.
(“Citibank”), as syndication agent (in such capacity, the “Syndication Agent”), Credit Suisse, Cayman Island Branch (“CS”), Goldman Sachs Credit Partners L.P. (“GSCP”), Lehman
Commercial Paper Inc. (the “Lehman Lender”), Morgan Stanley Senior Funding, Inc. (“MSSF”, together with CS, GSCP and the Lehman Lender, collectively, the “Co-Documentation Agents”), J.P. Morgan
Securities Inc., Citigroup Global Markets Inc., Credit Suisse Securities (USA) LLC, GSCP, Lehman Brothers Inc. and MSSF (collectively, the “Joint Lead Arrangers and Bookrunners”), JP Morgan Chase, as swingline lender (in such
capacity, the “Swingline Lender”) and JP Morgan Chase and Citibank as fronting banks for letters of credit issued thereunder (each a “Fronting Bank”). Capitalized terms used but not defined herein have the meanings
provided in the Agreement, as amended hereby. 
 WHEREAS, Section 8.08 of the Agreement permits the Lenders or, with the
consent of the Lenders, the Agent, to enter into amendments, supplements or other modifications to the Agreement with the Borrower; 
 WHEREAS, the Borrower has requested that (i) the Commitment of the Lehman Lender set forth on Schedule 2.01 to the Agreement be terminated and (ii) the Lehman Lender’s outstanding Loans be
repaid in their entirety, in each case as set forth in this Amendment (collectively, the “Lehman Lender Transaction”); 
 WHEREAS, the consent of each Lender is required in order to effect the Lehman Lender Transaction; and 
 WHEREAS, each Lender has consented to the Lehman Lender Transaction on the terms and conditions set forth herein. 
 NOW, THEREFORE, in consideration of the promises and covenants contained herein and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties
hereto, intending to be legally bound hereby, agree as follows: 
 Section 1 Amendments. 

(a) The following defined terms shall be added to Section 1.01 to the Agreement in the appropriate order: 

“‘First Amendment’ shall mean Amendment No. 1 to the Agreement, dated as of August 4, 2011.”

 ‘First Amendment Effective Date’ shall mean August 4, 2011. 

‘Lehman Loan’ shall mean loans made by the Lehman Lender to the Borrower; provided, that at no time following the
First Amendment Effective Date shall the aggregate principal amount of all outstanding Lehman Loans be greater than $0. 

  

 ‘Original Lehman Commitment’ shall mean the commitment of the Lehman Lender
in an amount set forth in Schedule 2.01 to the Agreement, as such Commitment may have been permanently reduced from time to time pursuant to Section 2.08 of the Agreement or modified from time to time pursuant to Section 8.04 of the
Agreement, in each case prior to the First Amendment Effective Date. 
 ‘Original Total Commitment’ shall mean
the aggregate amount of the Commitments of all the Lenders, as in effect immediately prior to the First Amendment Effective Date, which such amount was $2,000,000,000. 

(b) The term “Total Commitment” in Section 1.01 of the Agreement shall be amended and restated in its
entirety as follows: 
 “‘Total Commitment’ shall mean, at any time, the aggregate amount of the
Commitments of all the Lenders (other than the Lehman Lender) as in effect at such time (including the Incremental Commitment Increase of any Lender that becomes a Post-Increase Revolving Lender pursuant to Section 2.19). The amount of the
Total Commitment as of the First Amendment Effective Date is $1,868,125,000.” 
 (c) Section 2.05 is
hereby amended by inserting the following sentence at the end of clause (a): 
 “Amounts prepaid or repaid in respect of
the Lehman Loans may not be reborrowed.” 
 (d) Section 2.08(c) is hereby amended by deleting it in its
entirety and replacing it with the following new Section 2.08(c) in lieu thereof: 
 “(c) Each
reduction in the Commitments shall be made ratably among the Lenders in accordance with their respective Commitments; provided, that such pro rata reduction in Commitments shall not apply to the reduction of the Original Lehman Commitment to
zero and the termination of the Original Lehman Commitment pursuant to the First Amendment, and the resulting reduction of the Original Total Commitment to the Total Commitment, in each case as effected by the First Amendment. The Borrower shall pay
to the Agent for the account of the Lenders, on the date of each termination or reduction of the Commitments, the Facility Fee and Utilization Fee on the amount of the Commitments so terminated or reduced, in each case accrued through the date of
such termination or reduction; provided, that the Borrower shall not be required to pay to the Agent for the account of any Lender (other than the Lehman Lender) any Facility Fee or Utilization Fee on the First Amendment Effective Date.”

  
 -2-

 (e) Section 2.12 is hereby amended by deleting it in its entirety and
replacing it with the following new Section 2.12 in lieu thereof: 
 “(a) With respect to Commitments
(other than the Original Lehman Commitment) and Revolving Credit Loans (other than the Lehman Loans), except as required under Sections 2.10 and 2.15, each Extension of Credit, each payment or prepayment of principal of any Borrowing, each payment
of interest on the Loans, each payment of a reimbursement obligation in respect of a drawn Letter of Credit, each payment of the applicable Facility Fees and Utilization Fees, each reduction of the Total Commitment and each refinancing or conversion
of any Borrowing of Revolving Credit Loans with a Borrowing of Revolving Credit Loans of any Type, shall be allocated pro rata among the Lenders in accordance with their respective Percentages (or, if such Lender’s Commitment shall have expired
or been terminated, in accordance with the respective principal amounts of their Outstanding Credits). For purposes of determining the Available Commitments of the Lenders (other than the Lehman Lender) at any time, the LC Outstandings and Swingline
Outstandings shall be deemed to have utilized the Commitments of such Lenders pro rata in accordance with their respective Percentages at such time. Each such Lender agrees that in computing such Lender’s portion of any Extension of Credit to
be made hereunder, the Agent may, in its discretion, round each such Lender’s percentage of such Extension of Credit to the next higher or lower whole dollar amount. 

(b) With respect to the Lehman Loans, each payment or prepayment of principal, each payment of interest, and each payment
of the applicable Facility Fee and Utilization Fee shall be allocated pro rata among the Lehman Lender(s) in accordance with the aggregate principal amount of Lehman Loans held.” 

(f) The header and footer set forth on Schedule 2.01 to the Agreement are hereby amended by deleting them in their
entirety and replacing them with “Schedule 2.01” and “Schedule 2.01-1”, respectively. 
 (g)
Schedule 2.17(i) to the Agreement is hereby amended by deleting it in its entirety and replacing it with Schedule 2.17(i) attached hereto. 
 Section 2 Representations and Warranties, No Default. The Borrower represents and warrants to the Lenders as of the date hereof and as of the date of effectiveness of this Amendment:

 (a) The execution, delivery and performance by the Borrower of this Amendment, (i) have been duly authorized by all
requisite limited liability company action and (ii) will not (A) violate (x) any provision of any material Applicable Law or of the certificate of formation or other constitutive documents (including the limited liability company
agreement) of the Borrower or any of its Subsidiaries to which the Borrower or any of its Subsidiaries, as the case may be, is subject, or (y) any provision of any indenture, agreement or other instrument to which the Borrower or any of its
Subsidiaries is a party or by which it or any of its property is or may be bound, (B) be in conflict with, result in a breach of or constitute (alone or with notice or lapse of time or both) a default under any such indenture, agreement or
other instrument or (C) result in the creation or imposition of any Lien upon any property or assets of the Borrower or any of its Subsidiaries, other than in the case of clauses (ii)(A)(y), (ii)(B) and (ii)(C), any such violation, breach,
default or Lien that could not reasonably be expected to have a Material Adverse Change. 

  
 -3-

 (b) The representations and warranties set forth in the Agreement and in the other Credit
Documents are true and correct in all material respects with the same effect as if made on the date hereof, except to the extent such representations and warranties expressly relate to an earlier date, in which case such representations and
warranties shall have been true and correct in all material respects as of such earlier date. 
 (c) At the time of and after
giving effect to this Amendment, no Default or Event of Default has occurred and is continuing. 
 Section 3
Conditions to Effectiveness of Amendment. On the First Amendment Effective Date, this Amendment will become effective upon: 
 (a) receipt by the Agent of executed signature pages to this Amendment from each Lender and the Borrower; 
 (b) repayment by the Borrower of all Lehman Loans outstanding immediately prior to the First Amendment Effective Date, including all interest thereon; and 

(c) payment by the Borrower of the reasonable costs and expenses of the Agent in connection with this Amendment (including the reasonable
fees, disbursements and other charges of Cahill Gordon & Reindel LLP as counsel to the Agent). 

Section 4 Counterparts. This Amendment may be executed in any number of counterparts and by different parties hereto
on separate counterparts, each of which when so executed and delivered shall be deemed to be an original, but all of which when taken together shall constitute a single instrument. Delivery of an executed counterpart of a signature page of this
Amendment by facsimile transmission shall be effective as delivery of a manually executed counterpart hereof. 
 Section
5 Applicable Law. THIS AMENDMENT SHALL BE GOVERNED BY, CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 
 Section 6 Headings. The headings of this Amendment are for purposes of reference only and shall not limit or otherwise affect the meaning hereof. 

Section 7 Effect of Amendment. Except as expressly set forth herein, this Amendment shall not by implication or
otherwise limit, impair, constitute a waiver of or otherwise affect the rights and remedies of the Lenders or the other Secured Parties under the Agreement or any other Credit Document, and shall not alter, modify, amend or in any way affect any of
the terms, conditions, obligations, covenants or agreements contained in the Agreement or any other provision of either such agreement or any other Credit Document. Each and every term, condition, obligation, covenant and agreement contained in the
Agreement or any other Credit Document is hereby ratified and re-affirmed in all respects and shall continue in full force and effect. The Borrower reaffirms its obligations under the Credit Documents and the validity of the Liens granted by it
pursuant to the Security Documents. From and after the effective date of this Amendment, all references to the Agreement in any Credit Document shall, unless expressly provided otherwise, refer to the Agreement as amended by this Amendment.

  
 -4-

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of
the date first above written. 
  

			
	ONCOR ELECTRIC DELIVERY COMPANY LLC
		
	By 	 	/s/ John M. Casey
		 	Name: John M. Casey
		 	Title: Vice President - Treasurer

 Signature Page to First Amendment 

  

 
			
	JPMORGAN CHASE BANK, N.A., as Agent, Swingline Lender, Fronting Bank and as a Lender
		
	By:	 	/s/ Peter Christensen
		 	Name: Peter Christensen
		 	Title: Vice President

 Signature Page to First Amendment 

  

 
			
	 COMERICA BANK,
 as
a Lender,

		
	By:	 	/s/ Vontoba Terry
		 	Name: Vontoba Terry
		 	Title: Corporate Banking Officer

 Signature Page to First Amendment 

  

 
			
	 MACQUARIE BANK LIMITED,
 as a Lender,

		
	By:	 	/s/ Andrew Dainton
		 	Name: Andrew Dainton
		 	Title: Associate Director

			
		
	By:	 	/s/ Carol Ip
		 	Name: Carol Ip
		 	Title: Senior Manager

 Signature Page to First Amendment 

  

 
			
	 Bank Hapoalim B.M,
 as a Lender,

		
	By:	 	/s/ Helen H. Gateson
		 	Name: Helen H. Gateson
		 	Title: Vice President

			
		
	By:	 	/s/ Frederic S. Becker
		 	Name: Frederic S. Becker
		 	Title: Senior Vice President

 Signature Page to First Amendment 

  

 
			
	 COMMERZBANK AG, New York and Grand Cayman Branches,
 as a Lender,

		
	By:	 	/s/ Hans J. Scholz
		 	Name: Hans J. Scholz
		 	Title: Director

			
		
	By:	 	/s/ Barbara Stacks
		 	Name: Barbara Stacks
		 	Title: Assistant Vice President

 Signature Page to First Amendment 

  

 
			
	 THE ROYAL BANK OF SCOTLAND NV,
 as a Lender,

		
	By:	 	/s/ Bhavin Shah
		 	Name: Bhavin Shah
		 	Title: Managing Director

 Signature Page to First Amendment 

  

 
			
	 Skandinaviska Enskilda Banken AB (publ),
 as a Lender,

		
	By:	 	/s/ Karl Nylander
		 	Name: Karl Nylander

			
		
	By:	 	/s/ Mats Holmström
		 	Name: Mats Holmström

 Signature Page to First Amendment 

  

 
			
	 DEUTSCHE BANK AG NEW YORK BRANCH,
 as a Lender,

		
	By:	 	/s/ Philippe Sandmeier
		 	Name: Philippe Sandmeier
		 	Title: Managing Director

			
		
	By:	 	/s/ Ming K. Chu
		 	Name: Ming K. Chu
		 	Title: Vice President

 Signature Page to First Amendment 

  

 
			
	 PNC Bank, National Association,
 as a Lender,

		
	By:	 	/s/ M. Colin Warman
		 	Name: M. Colin Warman
		 	Title: Assistant Vice President

 Signature Page to First Amendment 

  

 
			
	 BANK OF AMERICA, N.A.,

as a Lender,

		
	By:	 	/s/ Michael Mason
		 	Name: Michael Mason
		 	Title: Director

 Signature Page to First Amendment 

  

 
			
	 Bank of Taiwan, Los Angeles Branch,
 as a Lender,

		
	By:	 	/s/ Chwan-Ming Ho
		 	Name: Chwan-Ming Ho
		 	Title: VP & General Manager

 Signature Page to First Amendment 

  

 
			
	 Credit Suisse AG, Cayman Islands Branch,
 as a Lender,

		
	By:	 	/s/ Alain Daoust
		 	Name: Alain Daoust
		 	Title: Director

			
		
	By:	 	/s/ Kevin Buddhdew
		 	Name: Kevin Buddhdew
		 	Title: Associate

 Signature Page to First Amendment 

  

 
			
	 WELLS FARGO BANK, NATIONAL ASSOCIATION,
 as a Lender,

		
	By:	 	/s/ Shawn Young
		 	Name: Shawn Young
		 	Title: Director

 Signature Page to First Amendment 

 
			
	 Sumitomo Mitsui Banking Corporation,
 as a Lender,

		
	By:	 	/s/ Masakazu Hasegawa
		 	Name: Masakazu Hasegawa
		 	Title: General Manager

 Signature Page to First Amendment 

 
			
	 CREDIT AGRICOLE CORPORATE & INVESTMENT BANK,
 as a Lender,

		
	By:	 	/s/ Darrell Stanley
		 	Name: Darrell Stanley
		 	Title: Managing Director
		
	By:	 	/s/ Sharada Manne
		 	Name: Sharada Manne
		 	Title: Director

 Signature Page to First Amendment 

 
			
	 The Northern Trust Company,
 as a Lender,

		
	By:	 	/s/ Morgan A. Lyons
		 	Name: Morgan A. Lyons
		 	Title: Senior Vice President

 Signature Page to First Amendment 

 
			
	 Mega International Commercial Bank
 Silicon Valley Branch,
 as a Lender,

		
	By:	 	/s/ Yuan-Hsi Lin
		 	Name: Yuan-Hsi Lin
		 	Title: SVP & General Manager

 Signature Page to First Amendment 

 
			
	 Barclays Bank PLC,

as a Lender,

		
	By:	 	/s/ May Huang
		 	Name: May Huang
		 	Title: Assistant Vice President

 Signature Page to First Amendment 

 
			
	 Lehman Commercial Paper Inc.,
 as a Lender,

		
	By:	 	/s/ Bennett Leichman
		 	Name: Bennett Leichman
		 	Title: Authorized Signatory

 Signature Page to First Amendment 

  

 
			
	 OAK HILL CREDIT PARTNERS II, LIMITED,
 as a Lender

	
	 By: Oak Hill CLO Management II, LLC
 As Investment Manager

		
	By:	 	/s/ Scott D. Krase
		 	Name: Scott D. Krase
		 	Title: Authorized Person
	
	 OAK HILL CREDIT PARTNERS III, LIMITED,
 as a Lender

		
	By:	 	Oak Hill CLO Management III, LLC
	As Investment Manager
		
	By:	 	/s/ Scott D. Krase
		 	Name: Scott D. Krase
		 	Title: Authorized Person
	
	 OAK HILL CREDIT PARTNERS IV, LIMITED,
 as a Lender

		
	By:	 	Oak Hill CLO Management IV, LLC
	As Investment Manager
		
	By:	 	/s/ Scott D. Krase
		 	Name: Scott D. Krase
		 	Title: Authorized Person

 Signature Page to First Amendment 

 
			
	 Land Bank of Taiwan, New York Branch,
 as a Lender,

		
	By:	 	/s/ Henry Leu
		 	Name: Henry Leu
		 	Title: SVP & General Manager

 Signature Page to First Amendment 

 
			
	 The Bank of New York Mellon,
 as a Lender,

		
	By:	 	/s/ Hussam S. Alsahlani
		 	Name: Hussam S. Alsahlani
		 	Title: Vice President

 Signature Page to First Amendment 

 
			
	 ERSTE GROUP BANK AG,

as a Lender,

		
	By:	 	/s/ Bryan J. Lynch
		 	Name: Bryan J. Lynch
		 	Title: Executive Director
		
	By:	 	/s/ Patrick W. Kunkel
		 	Name: Patrick W. Kunkel
		 	Title: Director

 Signature Page to First Amendment 

 
			
	 Morgan Stanley Bank, NA,
 as a Lender,

		
	By:	 	/s/ Scott Taylor
		 	Name: Scott Taylor
		 	Title: Authorized Signatory

 Signature Page to First Amendment 

 
			
	 Citibank, N.A.,
 as
a Lender,

		
	By:	 	/s/ Anita J. Brickell
		 	Name: Anita J. Brickell
		 	Title: Vice President

 Signature Page to First Amendment 

 
			
	 Taiwan Cooperative Bank, Seattle Branch,
 Seattle, Washington
 as a Lender,

		
	By:	 	/s/ Ming-Chih Chen
		 	Name: Ming-Chih Chen
		 	Title: VP and General Manager

 Signature Page to First Amendment 

 
			
	 GOLDMAN SACHS LENDING PARTNERS LLC,
 as a Lender,

		
	By:	 	/s/ Rick Canonico
		 	Name: Rick Canonico
		 	Title: Authorized Signatory

 Signature Page to First Amendment 

 
			
	 Union Bank, N.A.,

as a Lender,

		
	By:	 	/s/ Harvey Horowitz
		 	Name: Harvey Horowitz
		 	Title: VP

 Signature Page to First Amendment 

 SCHEDULE 2.17(i) 
 LC FRONTING BANK COMMITMENTS 
  

					
	Fronting Bank	  	LC Fronting Bank Commitment	 
	 JPMorgan Chase Bank, N.A.
	  	$	934,062,500	  
	 Citibank, N.A.
	  	$	934,062,500	  
		  	  
	  
	 
	 Total
	  	$	1,868,125,000	  

  
 Schedule
2.17(i) - 1

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