Exhibit 10.1

JOINDER AGREEMENT

This JOINDER AGREEMENT is entered into as of May 15, 2012 (this “Agreement”)
among Oncor Electric Delivery Company LLC (the “Borrower”), JPMorgan Chase Bank,
N.A., as administrative agent under the Credit Agreement referred to below (the
“Administrative Agent”), each party that executes and delivers a signature page
hereto as an “Incremental Lender” (the “Incremental Lenders”), the Swingline
Lender (as defined in the Credit Agreement) and each Fronting Bank (as defined
in the Credit Agreement), and is executed and delivered pursuant to
Section 2.19(c) of the Credit Agreement.

Reference is made to (i) the Amended and Restated Revolving Credit Agreement,
dated as of October 11, 2011 (the “Credit Agreement”), among the Borrower, the
Administrative Agent, the Swingline Lender, the Fronting Banks and the Lenders
(such term and other capitalized terms defined in the Credit Agreement are used
herein as defined therein), and (ii) a letter, dated May 1, 2012, from the
Borrower pursuant to which the Borrower has requested an Incremental Commitment
Increase pursuant to Section 2.19(a) of the Credit Agreement.

The Borrower and each Incremental Lender hereby agree that, subject to the
satisfaction of the conditions precedent set forth in Section 2.19(b) of the
Credit Agreement and the payment by the Borrower to each Incremental Lender of a
fee equal to 0.25% of such Incremental Lender’s share of the Incremental
Commitment Increase, the amount of the Commitment of such Incremental Lender
shall be increased by the amount set forth opposite such Incremental Lender’s
name on such Incremental Lender’s signature page. The Agreement is subject to
the provisions of Sections 8.05, 8.07, 8.12, 8.15, 8.19 and 8.21 of the Credit
Agreement, each of which is incorporated herein by reference, mutatis mutandis.

Except as expressly set forth herein, this Agreement shall not by implication or
otherwise limit, impair, constitute a waiver of, or otherwise affect the rights
and remedies of the Administrative Agent, any Fronting Bank, the Swingline
Lender or any Lender under the Credit 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 Credit
Agreement or any other Credit Document, all of which are ratified and affirmed
by the Borrower in all respects and shall continue in full force and effect.

[signature pages follow]

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IN WITNESS WHEREOF, each party named below has executed this Agreement and
delivered the same to the Administrative Agent for the benefit of each party to
the Credit Agreement as of the date and year first above written.

 

ONCOR ELECTRIC DELIVERY COMPANY LLC By   /s/ John M. Casey  

 

  John M. Casey   Vice President - Treasurer

 

[Signature Page to Oncor Joinder Agreement]

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JPMORGAN CHASE BANK, N.A., as Administrative Agent, Swingline Lender and
Fronting Bank By   /s/ Peter Christensen  

 

  Peter Christensen   Vice President BARCLAYS BANK PLC, as Fronting Bank By  
/s/ May Huang  

 

  May Huang   Assistant Vice President BANK OF AMERICA, N.A., as Fronting Bank
By   /s/ Mike Mason  

 

  Mike Mason   Director CITIBANK, N.A., as Fronting Bank By   /s/ Anita J.
Brickell  

 

  Anita J. Brickell   Vice President THE ROYAL BANK OF SCOTLAND PLC, as Fronting
Bank By   /s/ Emily Freedman  

 

  Emily Freedman   Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$35,000,000

   

JPMORGAN CHASE BANK, N.A.,

as Incremental Lender

    By   /s/ Peter Christensen       Peter Christensen       Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$35,000,000

   

BARCLAYS BANK, PLC,

as Incremental Lender

    By   /s/ Michael Mozer       Michael Mozer       Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$35,000,000

   

BANK OF AMERICA, N.A.,

as Incremental Lender

    By   /s/ Mike Mason      

Mike Mason

Director

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$35,000,000

   

CITIBANK, N.A.,

as Incremental Lender

    By   /s/ Anita J. Brickell      

Anita J. Brickell

Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$35,000,000

   

THE ROYAL BANK OF SCOTLAND PLC,

as Incremental Lender

    By   /s/ Emily Freedman      

Emily Freedman

Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$55,000,000

   

ROYAL BANK OF CANADA,

as Incremental Lender

    By   /s/ Frank Lambrinos      

Frank Lambrinos

Authorized Signatory

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$35,000,000

   

CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH,

as Incremental Lender

    By   /s/ Alain Daoust      

Alain Daoust

      Director     By   /s/ Kevin Buddhdew       Kevin Buddhdew       Associate

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$35,000,000

   

MORGAN STANLEY SENIOR FUNDING, INC.,

as Incremental Lender

    By   /s/ Kelly Chin      

Kelly Chin

      Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$25,000,000

   

UNION BANK, N.A.,

as Incremental Lender

    By   /s/ Jeff Fesenmaier      

Jeff Fesenmaier

Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$25,000,000

   

WELLS FARGO BANK, NATIONAL ASSOCIATION,

as Incremental Lender

    By   /s/ Scott Bjelde      

Scott Bjelde

Managing Director

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$25,000,000

   

U.S. BANK NATIONAL ASSOCIATION,

as Incremental Lender

    By    /s/ Eric J. Cosgrove       Eric J. Cosgrove       Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$10,000,000

   

THE NORTHERN TRUST COMPANY,

as Incremental Lender

    By    /s/ Morgan A. Lyons      

Morgan A. Lyons

      Senior Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$10,000,000

   

PNC BANK, NATIONAL ASSOCIATION,

as Incremental Lender

    By    /s/ M. Colin Warman      

M. Colin Warman

      Vice President

 

[Signature Page to Oncor Joinder Agreement]

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Incremental Commitment:

$5,000,000

   

BOKF, N.A. DBA BANK OF TEXAS,

as Incremental Lender

    By    /s/ Alan R. Morris      

Alan R. Morris

      Vice President

 

[Signature Page to Oncor Joinder Agreement]