Supplemental Indenture, dated as of March 18, 2025

THIS SUPPLEMENTAL INDENTURE, dated as of March 18, 2025, by and between SAN DIEGO GAS & ELECTRIC COMPANY, a corporation duly organized and existing under and by virtue of the laws of the State of California, having its principal office in that State in the City of San Diego (the “Company”), and U.S. BANK NATIONAL ASSOCIATION, a banking association duly organized under an act known as the “National Bank Act,” of the United States of America, having a corporate trust office in the City of Los Angeles, State of California, as Trustee (the “Trustee”).

WHEREAS, the Company executed and delivered a Mortgage and Deed of Trust (the “Original Indenture”), dated July 1, 1940, to The Bank of California, National Association, as predecessor trustee to Bankers Trust Company of California, National Association, as predecessor trustee to First Trust of California, National Association, (subsequently renamed U.S. Bank Trust National Association) as predecessor trustee to the Trustee, to secure payment of the principal of and the interest on all bonds of the Company at any time outstanding thereunder according to their tenor and effect, and to provide the terms and provisions with respect to its First Mortgage Bonds, 3 3/8% Series due July 1, 1970, issued in the aggregate principal amount of $16,000,000 and heretofore retired; and

WHEREAS, the Company executed and delivered to the then current trustee, a First Supplemental Indenture dated as of December 1, 1946, a Second Supplemental Indenture dated as of March 1, 1948, a Third Supplemental Indenture dated as of April 1, 1952, a Fourth Supplemental Indenture dated as of April 1, 1954, a Fifth Supplemental Indenture dated as of October 1, 1955, a Sixth Supplemental Indenture dated as of October 1, 1957, a Seventh Supplemental Indenture dated as of October 1, 1960, an Eighth Supplemental Indenture dated as of March 1, 1967, a Tenth Supplemental Indenture dated as of December 1, 1968, an Eleventh Supplemental Indenture dated as of February 1, 1970, a Twelfth Supplemental Indenture dated as of September 1, 1971, a Thirteenth Supplemental Indenture dated as of January 15, 1974, a Fourteenth Supplemental Indenture dated as of December 15, 1974, a Fifteenth Supplemental Indenture dated as of May 1, 1975, a Seventeenth Supplemental Indenture dated as of July 15, 1976, an Eighteenth Supplemental Indenture dated as of March 15, 1977, a Nineteenth Supplemental Indenture dated as of May 1, 1978, a Twentieth Supplemental Indenture dated as of March 15, 1980, a Twenty-First Supplemental Indenture dated as of August 1, 1980, a Twenty-Second Supplemental Indenture dated as of July 15, 1981, a Twenty-Third Supplemental Indenture dated as of January 15, 1982, a Twenty-Fourth Supplemental Indenture dated as of August 16, 1982, a Twenty-Fifth Supplemental Indenture dated as of August 16, 1982, a Twenty-Sixth Supplemental Indenture dated as of August 16, 1982, a Twenty-Seventh Supplemental Indenture dated as of June 1, 1983, a Twenty-Eighth Supplemental Indenture dated as of July 15, 1983, a Twenty-Ninth Supplemental Indenture dated as of September 1, 1983, a Thirty-First Supplemental Indenture dated as of May 1, 1984, a Thirty-Second Supplemental Indenture dated as of December 1, 1984, a Thirty-Third Supplemental Indenture dated as of September 1, 1985, a Thirty-Fourth Supplemental Indenture dated as of December 1, 1985, a Thirty-Fifth Supplemental Indenture dated as of July 1, 1986, a Thirty-Sixth Supplemental Indenture dated as of December 1, 1986, a Thirty-Seventh Supplemental Indenture dated as of September 1, 1987, a Thirty-Eighth Supplemental Indenture dated as of April 15, 1990, a Thirty-Ninth Supplemental Indenture dated as of December 1, 1991, a Fortieth Supplemental Indenture dated as of April 1, 1992, a Forty-First Supplemental Indenture dated as of June 15, 1992, a Forty-Second Supplemental Indenture dated as of September 1, 1992, a Forty-Third Supplemental Indenture dated as of December 1, 1992, a Forty-Fourth Supplemental Indenture dated as of April 1, 1993, a Forty-Fifth Supplemental Indenture dated as of June 1, 1993, a Forty-Sixth Supplemental Indenture dated as of July 1, 1993, a Forty-Seventh Supplemental Indenture dated as of June 1, 1995, a Forty-Eighth Supplemental Indenture dated as of June 1, 1995, a Forty-Ninth Supplemental Indenture dated as of June 1, 2004, a Fiftieth Supplemental Indenture dated as of May 19, 2005, a Fifty-First Supplemental Indenture dated as of November 17, 2005, a Fifty-Second Supplemental Indenture dated as of June 8, 2006, a Fifty-Third Supplemental Indenture dated as of September 1, 2006, a Fifty-Fourth Supplemental Indenture dated as of September 20, 2007, a Fifty-Fifth Supplemental Indenture dated as of May 14, 2009, a Fifty-Sixth Supplemental Indenture dated as of May 13, 2010, a Fifty-Seventh Supplemental Indenture dated as of August 26, 2010, a Fifty-Eighth Supplemental Indenture dated as

of August 18, 2011, a Fifty-Ninth Supplemental Indenture dated as of October 6, 2011, a Sixtieth Supplemental Indenture dated as of November 17, 2011, a Sixty-First Supplemental Indenture dated as of March 22, 2012, a Sixty-Second Supplemental Indenture dated as of September 9, 2013, a Sixty-Third Supplemental Indenture dated as of March 12, 2015, a Sixty-Fourth Supplemental Indenture dated as of March 12, 2015, a Sixty-Fifth Supplemental Indenture dated May 19, 2016, a Sixty-Sixth Supplemental Indenture dated as of June 8, 2017, a Sixty-Seventh Supplemental Indenture dated as of May 17, 2018, a Sixty-Eighth Supplemental Indenture dated as of May 31, 2019, a Sixty-Ninth Supplemental Indenture dated as of April 7, 2020, a Seventieth Supplemental Indenture dated as of September 28, 2020, a Seventy-First Supplemental Indenture dated as of August 13, 2021, a Seventy-Second Supplemental Indenture dated as of March 11, 2022, a Seventy-Third Supplemental Indenture dated as of March 11, 2022, a Seventy-Fourth Supplemental Indenture dated as of March 10, 2023, a Seventy-Fifth Supplemental Indenture dated as of August 11, 2023 and a Seventy-Sixth Supplemental Indenture dated as of March 22, 2024, whereby, among other things, the Company set forth certain of the particulars of the Bonds of series designated “First Mortgage Bonds, 2 3/4% Series due December 1, 1981” issued in the aggregate principal amount of $2,800,000, “First Mortgage Bonds, Series C due 1978” issued in the aggregate principal amount of $10,000,000, “First Mortgage Bonds, Series D due 1982” issued in the aggregate principal amount of $12,000,000, “First Mortgage Bonds, Series E due 1984” issued in the aggregate principal amount of $17,000,000, “First Mortgage Bonds, Series F due 1985” issued in the aggregate principal amount of $18,000,000, “First Mortgage Bonds, Series G due 1987” issued in the aggregate principal amount of $12,000,000, “First Mortgage Bonds, Series H due 1990” issued in the aggregate principal amount of $30,000,000, “First Mortgage Bonds, Series I due 1997” issued in the aggregate principal amount of $25,000,000, “First Mortgage Bonds, Series J due 1998” issued in the aggregate principal amount of $35,000,000, “First Mortgage Bonds, Series K due 2000” issued in the aggregate principal amount of $40,000,000, “First Mortgage Boards, Series L due 2001” issued in the aggregate principal amount of $45,000,000, “First Mortgage Bonds, Series M due 2004” issued in the aggregate principal amount of $75,000,000, “First Mortgage Bonds, Series N due 1979” issued in the aggregate principal amount of $50,000,000, “First Mortgage Bonds, Series O due 1982” issued in the aggregate principal amount of $40,000,000, “First Mortgage Bonds, Series P due 2006” issued in the aggregate principal amount of $45,000,000, “First Mortgage Bonds, Series Q due 2007” issued in the aggregate principal amount of $50,000,000, “First Mortgage Bonds, Series R due 2008” issued in the aggregate principal amount of $50,000,000, “First Mortgage Bonds, Series S due 2010” issued in the aggregate principal amount of $50,000,000, “First Mortgage Bonds, Series T due 2010” issued in the aggregate principal amount of $75,000,000, “First Mortgage Bonds, Series U-1 due 1984, and U-2 due 1994” issued in the aggregate principal amount of $6,567,000 for Series U-1 and $13,268,000 for Series U-2, “First Mortgage Bonds, Series V due 2011” issued in the aggregate amount of $50,000,000, “First Mortgage Bonds, Series W due 1988” issued in the aggregate principal amount of $40,000,000, “First Mortgage Bonds, Series X due 1987” issued in the aggregate principal amount of $20,000,000, “First Mortgage Bonds, Series Y due 1987” issued in the aggregate principal amount of $15,000,000, “First Mortgage Bonds, Series Z, due 2013” issued in the aggregate principal amount of $65,000,000, “First Mortgage Bonds, Series AA, due 2018” issued in the aggregate principal amount of $150,000,000, “First Mortgage Bonds, Series BB, due 2018” issued in the aggregate principal amount of $150,000,000, “First Mortgage Bonds, Series CC, due 2008” issued in the aggregate principal amount of $53,000,000, “First Mortgage Bonds Series DD, due 2008” issued in the aggregate principal amount of $27,000,000, “First Mortgage Bonds, Series EE, due 2015” issued in the aggregate principal amount of $100,000,000, “First Mortgage Bonds, Series FF, due 2007” issued in the aggregate principal amount of $35,000,000, “First Mortgage Bonds, Series GG, due 2021” issued in the aggregate principal amount of $44,250,000, “First Mortgage Bonds, Series HH, due 2021” issued in the aggregate principal amount of $81,350,000, “First Mortgage Bonds, Series II due 2023” issued in the aggregate principal amount of $25,000,000, “First Mortgage Bonds, Series JJ, due 2015” issued in the aggregate principal amount of $100,000,000, “First Mortgage Bonds, Series KK, due 2015” issued in the aggregate principal amount of $14,400,000, “First Mortgage Bonds, Series LL, due 2022” issued in the aggregate principal amount of $60,000,000, “First Mortgage Bonds, Series MM due 2002” issued in the aggregate principal amount of $80,000,000, “First Mortgage Bonds, Series NN” issued in the aggregate principal amount of $118,615,000, “First Mortgage Bonds, Series OO due 2027” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series PP, due 2018” issued in the aggregate principal amount of $70,795,000, “First Mortgage Bonds, Series QQ, due 2018” issued in the aggregate principal amount of $14,915,000, “First Mortgage Bonds, Series RR, due 2021” issued in the aggregate principal amount of $60,000,000, “First Mortgage Bonds, Series SS, due 2018” issued in the aggregate principal amount of $92,945,000,

“First Mortgage Bonds, Series TT due 2020” issued in the aggregate principal amount of $57,650,000, “First Mortgage Bonds, Series UU due 2020” issued in the aggregate principal amount of $16,700,000, “First Mortgage Bonds, Series VV due 2034” issued in the aggregate principal amount of $43,615,000, “First Mortgage Bonds, Series WW due 2034” issued in the aggregate principal amount of $40,000,000, “First Mortgage Bonds, Series XX due 2034” issued in the aggregate principal amount of $35,000,000, “First Mortgage Bonds, Series YY due 2034” issued in the aggregate principal amount of $24,000,000, “First Mortgage Bonds, Series ZZ due 2034” issued in the aggregate principal amount of $33,650,000, “First Mortgage Bonds, Series AAA due 2039” issued in the aggregate principal amount of $75,000,000, “First Mortgage Bonds, Series BBB due 2035” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series CCC due 2015” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series DDD due 2026” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series EEE due 2018” issued in the aggregate principal amount of $161,240,000, “First Mortgage Bonds, Series FFF due 2037” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series GGG due 2039” issued in the aggregate principal amount of $300,000,000, “First Mortgage Bonds, Series HHH due 2040” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series III due 2040” issued in the aggregate principal amount of $500,000,000, “First Mortgage Bonds, Series JJJ due 2021” issued in the aggregate principal amount of $350,000,000, “First Mortgage Bonds, Series LLL due 2041” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series MMM due 2042” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series NNN due 2023” issued in the aggregate principal amount of $450,000,000, “Floating Rate First Mortgage Bonds, Series OOO due 2017” issued in the aggregate principal amount of $140,000,000, “Amortizing First Mortgage Bonds, Series PPP due 2022” issued in the aggregate principal amount of $250,000,000, “First Mortgage Bonds, Series QQQ due 2026” issued in the aggregate principal amount of $500,000,000, “First Mortgage Bonds, Series RRR due 2047” issued in the aggregate principal amount of $400,000,000, “First Mortgage Bonds, Series SSS due 2048” issued in the aggregate principal amount of $400,000,000, “First Mortgage Bonds, Series TTT due 2049” issued in the aggregate principal amount of $400,000,000, “First Mortgage Bonds, Series UUU due 2050” issued in the aggregate principal amount of $400,000,000, “First Mortgage Bonds, Series VVV due 2030” issued in the aggregate principal amount of $800,000,000, “Green First Mortgage Bonds, Series WWW due 2051” issued in the aggregate principal amount of $750,000,000, “First Mortgage Bonds, Series XXX due 2032” issued in the aggregate principal amount of $500,000,000, “First Mortgage Bonds, Series YYY due 2052” issued in the aggregate principal amount of $500,000,000, “First Mortgage Bonds, Series ZZZ due 2053” issued in the aggregate principal amount of $800,000,000, “Green First Mortgage Bonds, Series AAAA due 2028” issued in the aggregate principal amount of $600,000,000 and “First Mortgage Bonds, Series BBBB due 2054” issued in the aggregate principal amount of $600,000,000, respectively, all of which First Mortgage Bonds have heretofore been retired or redeemed, except the Series BBB due 2035, the Series DDD due 2026, the Series FFF due 2037, the Series GGG due 2039, the Series HHH due 2040, the Series III due 2040, the Series LLL due 2041, the Series MMM due 2042, the Series QQQ due 2026, the Series RRR due 2047, the Series SSS due 2048, the Series TTT due 2049, the Series UUU due 2050, the Series VVV due 2030, the Series WWW due 2051, the Series XXX due 2032, the Series YYY due 2052, the Series ZZZ due 2053, the Series AAAA due 2028, and the Series BBBB due 2054, which are presently issued and outstanding; and

WHEREAS, certain of the provisions of the Original Indenture have been amended by the aforesaid Second and Tenth Supplemental Indentures, a Ninth Supplemental Indenture dated as of August 1, 1968 and a Sixteenth Supplemental Indenture dated August 28, 1975; and

WHEREAS, the Original Indenture and each of said Supplemental Indentures have been recorded in the Official Records of the Recorders of the Counties of San Diego, Orange, Riverside, and Imperial in the State of California, the Counties of Yuma and Maricopa in the State of Arizona and the County of Clark in the State of Nevada, as follows:

WHEREAS, the Original Indenture and each of said Supplemental Indentures that have amended the Original Indenture, as currently in effect, are attached hereto as Exhibit A;

WHEREAS, the execution and delivery of this Supplemental Indenture has been duly authorized by resolution of the Board of Directors of the Company; and

WHEREAS, all the conditions and requirements necessary to make this Supplemental Indenture a valid, binding and legal instrument in accordance with its terms and for the purposes herein expressed have been performed and fulfilled and the execution and delivery hereof have been in all respects duly authorized.

NOW, THEREFORE, in order further to secure the payment of the principal of and premium, if any, and interest on all of the bonds of the Company at any time outstanding under the Original Indenture, as heretofore amended and supplemented, as amended and supplemented by this Supplemental Indenture and as the same may from time to time be further amended and supplemented (the “Indenture”) and to secure the performance and observance of each and every of the covenants, conditions and agreements of the Indenture, as from time to time amended and supplemented, and for and in consideration of the premises, and of the sum of One Dollar ($1.00) to the Company duly paid by the Trustee (the receipt whereof is hereby acknowledged), the Company has executed and delivered this Supplemental Indenture and has granted, bargained, sold, warranted, released, conveyed, assigned, transferred, mortgaged, pledged, hypothecated, granted a security interest in, set over and confirmed, and by these presents does grant, bargain, sell, warrant, release, convey, assign, transfer, mortgage, pledge, hypothecate, grant a security interest in, set over and confirm unto U.S. Bank National Association, as Trustee, and to its respective successors in said trust forever, with power of sale, all property, real, personal and mixed, now owned or hereafter acquired or to be acquired by the Company, and wheresoever situated (except such property as is expressly excepted or excluded from the lien and security interest of the Indenture, and property of a successor corporation or corporations excluded from the lien and security interest thereof by the provisions of Section 3 of Article XIV thereof) subject to the rights reserved by the Company in and by other provisions of the Indenture, including in the property subject and to be subject to the lien and security interest thereof and hereof (without in any manner limiting or impairing by the enumeration of the same the scope and intent of the foregoing or of any general description contained in the Original Indenture or in this or any other supplemental indenture) all lands, rights-of-way, other land rights, flowage and other water rights, power houses, dams, reservoirs, docks, roads, and buildings, structures and other land improvements; steam, and other electric generating plants, including buildings and other structures, turbines, generators, exciters, boilers and other boiler plant equipment, condensing equipment, and all auxiliary equipment; stations and substations; electric transmission and distribution systems, including structures, poles, towers, fixtures, conduits, insulators, wires, cables, transformers, services and meters; steam heating plants and systems, including mains and equipment; gas plants, transmission and distribution systems, including pipe lines, structures, tanks, mains, compressor stations, purifier stations, pressure holders, governors, services and meters; communication systems, office, shop and other buildings and structures, and equipment; apparatus and equipment and materials and supplies of all other kinds and descriptions; and all municipal and other franchises, leaseholds, licenses, permits, and privileges;

TOGETHER WITH all and singular the tenements, hereditaments and appurtenances belonging or in any wise appertaining to the aforesaid property or any part thereof with the reversion and reversions, remainder and remainders, tolls, rents and revenues, issues, income, proceeds, product and profits thereof, and all the estate, right, title and interest and claim whatsoever, at law as well as in equity, which the Company now has or may hereafter acquire in and to the aforesaid property and franchises and every part and parcel thereof (except such property as is expressly excepted or excluded from the lien and security interest of the Indenture, and property of a successor corporation or corporations excluded from the lien and security thereof by the provisions of Section 3 of Article XIV thereof), subject to the rights reserved by the Company in and by other provisions of the Indenture;

It is hereby agreed by the Company that, except as aforesaid, all the property, rights, and franchises acquired by the Company after the date hereof shall be as fully embraced within the lien and security interest hereof as if such property were now owned by the Company and were specifically described herein and conveyed and a security interest therein granted hereby;

SAVING AND EXCEPTING, HOWEVER, anything to the contrary notwithstanding contained herein or in the granting clauses of the Original Indenture and said Supplemental Indentures (a) such property described or referred to in any of such granting clauses as has been from time to time, released or sold free from the lien and security interest of the Original Indenture (or the Original Indenture, as supplemented) in accordance and compliance with the provisions thereof (or of the Original Indenture, as supplemented, as the case may be), and (b) all of the following property (whether now owned by the Company or hereafter acquired by it): (1) all gas, electric energy and steam produced, purchased or otherwise acquired; (2) all contracts, choses in action, shares of stock, bonds, notes, evidences of indebtedness, and other securities, other than any of the foregoing which may be required to be deposited from time to time with the Trustee in accordance with the provisions of the Indenture or are required by some express provision thereof to be deposited with the Trustee; (3) merchandise and appliances at any time acquired for the purpose of sale or lease to customers and others and contracts for the sale of merchandise and appliances; (4) motor vehicles; (5) timber on land owned by the Company; (6) minerals or mineral rights in lands owned by the Company; (7) oil, coal or gas, or oil, coal or gas rights in land owned by the Company or gas wells or oil wells or equipment therefor or coal mines or equipment therefor; (8) fuel and other personal property which are consumable in their use in the operation of the properties of the Company; (9) bills and accounts receivable; (10) cash on hand and in banks other than such cash as may be deposited from time to time with the Trustee in accordance with the provisions of the Indenture or as is required by some express provision thereof to be deposited with the Trustee; and (11) the last day of the term of each leasehold estate now or hereafter enjoyed by the Company. The Company may, however, expressly subject to the lien and security interest and operation of the Original Indenture and all indentures supplemental thereto all or any part of the property of the character described in clause (b) of this paragraph;

TO HAVE AND TO HOLD all said properties, real, personal and mixed, mortgaged, pledged, or conveyed and in which a security interest has been granted by the Company as aforesaid, or intended so to be, unto the Trustee and its successors and assigns forever, subject, however, to Permitted Liens as defined in the Indenture;

IN TRUST NEVERTHELESS, for the equal pro rata benefit and security as provided in the Original Indenture and all indentures supplemental thereto of all and every of the bonds issued and to be issued in accordance with the provisions of the Original Indenture and all indentures supplemental thereto, without preference, priority or distinction as to lien or security interest of any over the others by reason of priority in time of the issue, negotiation or maturity thereof, subject, however, to the provisions of the Original Indenture and all indentures supplemental thereto relating to any sinking fund or similar fund for the benefit of the bonds of any particular series;

The Company does further covenant and agree with the Trustee as follows:

Section 5: To the extent any provision in this Supplemental Indenture conflicts with any provision in the Indenture, the provisions of this Supplemental Indenture shall govern; provided, however, that in the event such conflict would require bondholder consent, the terms and provisions of the Indenture shall govern.

Section 6: The Original Indenture, as heretofore amended and supplemented, insofar as it applies to this Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of California, without regard (to the extent permitted by applicable law) to conflicts of laws principles thereof; provided, that, notwithstanding the foregoing, the creation, perfection and enforcement of any mortgage or lien on real property or improvements thereon or fixtures attached thereto under the Original Indenture, as heretofore amended and supplemented, insofar as it applies to this Supplemental Indenture shall be governed by and construed in accordance with the laws of the State where such real property or improvements thereon or fixtures attached thereto, as the case may be, are located, without regard (to the extent permitted by applicable law) to conflicts of laws principles thereof.

IN WITNESS WHEREOF, SAN DIEGO GAS & ELECTRIC COMPANY has caused this Supplemental Indenture to be signed in its name and behalf by its duly authorized officer and its corporate seal to be hereunto affixed duly attested by its Secretary or one of its Assistant Secretaries, and U.S. BANK NATIONAL ASSOCIATION, to evidence its acceptance of the trusts hereby created, has caused this Supplemental Indenture to be signed in its name and behalf by its duly authorized officer as of the day and year first above written.

    On March 18, 2025, before me, DEBORAH MELLINGER, a Notary Public, personally appeared VALERIE A. BILLE and ERBIN B. KEITH, who proved to me on the basis of satisfactory evidence to be the persons whose names are subscribed to the within instrument and acknowledged to me that they executed the same in their authorized capacities, and that by their signatures on the instrument the persons, or the entity upon behalf of which the persons acted, executed the instrument.

    I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

    WITNESS my hand and official seal.

SIGNATURE OF NOTARY PUBLIC

    On March 18, 2025, before me, LAUREN COSTALES, a Notary Public, personally appeared FONDA HALL, of U.S. BANK NATIONAL ASSOCIATION, who proved to me on the basis of satisfactory evidence to be the person whose name is subscribed to the within instrument and acknowledged to me that he/she executed the same in his/her authorized capacity, and that by his/her signature on the instrument the person, or the entity upon behalf of which the person acted, executed the instrument.

    I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

    WITNESS my hand and official seal.

SIGNATURE OF NOTARY PUBLIC