FIRST AMENDMENT TO DEED OF TRUST, SECURITY AGREEMENT AND FIXTURE FILING by

Exhibit 4(n)

FIRST AMENDMENT

TO

DEED OF TRUST, SECURITY AGREEMENT AND FIXTURE FILING

by

ONCOR ELECTRIC DELIVERY COMPANY LLC,

as Grantor

to and for the benefit of

THE BANK OF NEW YORK MELLON,

as Collateral Agent

Dated as of March 2, 2009

THIS INSTRUMENT GRANTS A SECURITY INTEREST BY A UTILITY.

THIS INSTRUMENT CONTAINS AFTER-ACQUIRED PROPERTY PROVISIONS.

FIRST AMENDMENT

TO

DEED OF TRUST, SECURITY AGREEMENT AND FIXTURE FILING

THIS FIRST AMENDMENT TO DEED OF TRUST, SECURITY AGREEMENT AND FIXTURE FILING (this “Amendment”) is executed to be dated as of March 2, 2009, by ONCOR ELECTRIC DELIVERY COMPANY LLC, a Delaware limited liability company (“Grantor”), having an organizational identification number of ###-###-#### and an office at Energy Plaza, 1601 Bryan Street, Dallas, Texas 75201, Attention: Treasurer, to and for the benefit of THE BANK OF NEW YORK MELLON (formerly The Bank of New York), a New York banking corporation, as Collateral Agent and Trustee (“Collateral Agent” and “DOT Trustee”) under the Deed of Trust (as defined below), whose address is The Bank of New York Mellon, c/o Corporate Trust Administration, 101 Barclay Street, Floor 8W, New York, New York 10286.

RECITALS:

A. Grantor executed and delivered that certain Deed of Trust, Security Agreement and Fixture Filing dated as of May 15, 2008 (the “Deed of Trust”) to the Collateral Agent, which was filed of record with the Texas Secretary of State pursuant to Section 35.02 of the Texas Business and Commerce Code on May 15, 2008 under file number 08-0016750724.

B. Pursuant to Section 7.1(e) of the Deed of Trust, Grantor wishes to amend the Deed of Trust to correct the figure set forth therein with respect to Available Bond Credits.

C. Grantor has furnished to the Collateral Agent an Officer’s Certificate and an Opinion of Counsel pursuant to Section 25 of the Deed of Trust.

D. Grantor has duly authorized the execution and delivery of this Amendment and hereby requests the Collateral Agent to execute and deliver this Amendment.

E. All things necessary to make this Amendment a valid and binding agreement of the Grantor and an amendment to the Deed of Trust in accordance with its terms have been done and performed.

AGREEMENT:

FOR VALUABLE CONSIDERATION, the receipt and sufficiency of which are hereby acknowledged, Grantor and Collateral Agent hereby agree as follows:

1. Definitions. Capitalized terms used in this Amendment shall have the same meaning as ascribed to such terms in the Deed of Trust unless defined otherwise herein.

2. Amendment. The definition of “Available Bond Credits” in Section 1 of the Deed of Trust is hereby deleted in its entirety and the following is inserted in lieu thereof:

“Available Bond Credits” as of the Execution Date equals $2,241,394,604. Thereafter, Available Bond Credits shall be (a) increased by the principal amount of Obligations (other than Deed of Trust Obligations) paid, retired or cancelled or for the payment of which money has been deposited with the applicable Secured Party Representative, and (b) decreased by the principal amount of Additional Obligations secured pursuant to Section 22 hereof.

3. Ratification. Except as expressly set forth herein, this Amendment shall not alter, amend, modify or otherwise affect the terms, provisions and conditions of the Credit Documents, and Grantor hereby ratifies, confirms and agrees that the Credit Documents and all liens, security interests, assignments, powers, indemnities, waivers and other rights created for Collateral Agent’s benefit thereunder, including, without limitation, the lien created by the Deed of Trust, as amended by this Amendment, shall continue to secure, in the same manner, in the same priority and to the same extent set forth therein, the payment and performance of the Obligations, and all of same are hereby renewed, extended, carried forward, ratified and confirmed and shall be deemed for all purposes in full force and effect.

4. No Waiver. The execution and/or acceptance of this Amendment by Grantor shall not be deemed or construed as: (a) a novation or an accord and satisfaction of any of Grantor’s duties, obligations and liabilities contained in the Credit Documents, as amended; (b) a waiver, modification, restriction or limitation of any and all of the Collateral Agent’s rights and benefits arising under the Credit Documents by operation of law, or otherwise, to demand full, complete and strict performance of the duties, obligations and liabilities contained in the Credit Documents, as amended; or (c) an obligation of the Collateral Agent to grant Grantor any future or further modification, renewal, extension and/or amendment to the Deed of Trust, as amended hereby, or any or all of the other Credit Documents.

5. Counterparts. This Amendment may be executed by one or more of the parties to this Amendment on any number of separate counterparts with the same effect as if the signature thereto and hereto were upon the same instrument, and all of said counterparts taken together shall be deemed to constitute one and the same instrument.

6. Severability. In the event any one or more of the provisions contained in this Deed of Trust shall for any reason be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provision hereof, but each shall be construed as if such invalid, illegal or unenforceable provision had never been included.

7. Entire Agreement. This Amendment and the Credit Documents as amended in writing and signed by the parties represent the entire agreement of the parties with respect to the subject matter hereof, and there are no promises, undertakings, representations or warranties by any party relative to the subject matter hereof not expressly set forth or referred to herein or therein.

8. Further Amendment. Neither this Amendment nor any terms hereof may be amended, supplemented or modified except by a written instrument executed by the parties in accordance with the terms and conditions of the Deed of Trust. This Amendment shall be binding upon and shall inure to the benefit of the parties hereto and their respective successors and assigns.

9. Authority. The Grantor and the respective representative thereof executing this Amendment on its behalf, each represents that such representative has full power, authority and legal right to execute and deliver this Amendment and that the same constitutes a valid and binding obligation of such party.

10. Collateral Agent. The Collateral Agent shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Amendment or for or in respect of the recitals contained herein, all of which recitals are made solely by the Grantor.

11. Governing Law. This Amendment shall be governed by and construed and interpreted in accordance with the laws of the State of Texas, except that Grantor expressly acknowledges that all of the rights, benefits, privileges, immunities and obligations of the Collateral Agent under this Amendment shall be governed and construed in accordance with the laws of the State of New York.

[Signature Page Follows.]

This Amendment has been duly executed by Grantor as of the date first above written and is intended to be effective as of such date.

This instrument was acknowledged before me this 27th day of February 2009, by John M. Casey, Treasurer of ONCOR ELECTRIC DELIVERY COMPANY LLC, a Delaware limited liability company, on behalf of said limited liability company.

This Amendment has been duly executed by Collateral Agent as of the date first above written and is intended to be effective as of such date.

This instrument was acknowledged before me this 2 day of March 2009, by Kimberly P. Davidson, a Vice President of THE BANK OF NEW YORK MELLON, a New York banking corporation, on behalf of said banking corporation.