Idaho Power Company Fifty-first Supplemental Indenture, dated effective as of October 14, 2022, to Mortgage and Deed of Trust, dated as of October 1, 1937

SUPPLEMENTAL INDENTURE, dated as of the 14th day of October, 2022, made and entered into by and between IDAHO POWER COMPANY, a corporation of the State of Idaho (successor by merger to Idaho Power Company, a corporation of the State of Maine, hereinafter sometimes called the “Maine Company”), whose address is 1221 West Idaho Street, Boise, Idaho ###-###-#### (hereinafter sometimes called the “Company”), party of the first part, and DEUTSCHE BANK TRUST COMPANY AMERICAS, formerly known as Bankers Trust Company, a corporation of the State of New York whose post office address is 1 Columbus Circle, 17th Floor, Mail Stop: NYC01-1710, New York, New York 10019, party of the second part (hereinafter sometimes called the “Trustee”), as Trustee under the Mortgage and Deed of Trust dated as of October 1, 1937 hereinafter referred to.

WHEREAS, the Maine Company has heretofore executed and delivered to the Trustee its Mortgage and Deed of Trust (hereinafter sometimes referred to as the “Original Indenture”), dated as of October 1, 1937, to secure the payment both of the principal of and interest and premium, if any, on all Bonds at any time issued and outstanding thereunder and to declare the terms and conditions upon which Bonds are to be issued thereunder; and

WHEREAS, the Maine Company was merged into the Company on June 30, 1989; and

WHEREAS, in order to evidence the succession of the Company to the Maine Company and the assumption by the Company of the covenants and conditions of the Maine Company in the Bonds and in the Original Indenture, as supplemented, and to enable the Company to have and exercise the powers and rights of the Maine Company under the Original Indenture, as supplemented, in accordance with the terms thereof, the Company executed and delivered to the Trustee a Twenty-eighth Supplemental Indenture, dated as of June 30, 1989 (which supplemental indenture is hereinafter sometimes called the “Twenty-eighth Supplemental Indenture”); and

WHEREAS, said Twenty-eighth Supplemental Indenture was recorded in the records of the County of Elko, Nevada; the Counties of Baker, Grant, Harney, Malheur, Union and Wallowa, Oregon; the Counties of Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, Elmore, Gem, Gooding, Idaho, Jefferson, Jerome, Lemhi, Lincoln, Minidoka, Oneida, Owyhee, Payette, Power, Twin Falls, Valley and Washington, Idaho; the Counties of Lincoln and Sweetwater, Wyoming; and with the Secretary of State of the States of Idaho, Montana, Oregon, Nevada and Wyoming; and

WHEREAS, pursuant to a written request of the Company under Section 103 of the Original Indenture, Stanley Burg, successor Individual Trustee (as defined in the Original Indenture) to R.G. Page under the Original Indenture, was removed as Individual Trustee under the Original Indenture, effective as of May 18, 2016 and (i) his right, title or interest in and to the trust estate and (ii) all the right, title, and powers of the Trustees (as defined in the Original Indenture) under the Original Indenture devolved upon the Trustee and its successors alone; and

WHEREAS, in accordance with the terms of the Original Indenture the Maine Company or the Company has executed and delivered to the Trustee the following supplemental indentures in addition to the Twenty-eighth Supplemental Indenture:

each of which is supplemental to the Original Indenture (the Original Indenture and all indentures supplemental thereto together being hereinafter sometimes referred to as the “Indenture”); and

WHEREAS, the Original Indenture and said Supplemental Indentures (except said Fifteenth Supplemental Indenture) have each been recorded in the records of the County of Beaverhead, Montana; the Counties of Elko, Humboldt and Lander, Nevada; the Counties of Baker, Grant, Harney, Malheur, Union and Wallowa, Oregon; the Counties of Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, Elmore, Gem, Gooding, Idaho, Jefferson, Jerome, Lake, Lemhi, Lincoln, Minidoka, Oneida, Owyhee, Payette, Power, Twin Falls, Valley and Washington, Idaho; the County of Walla Walla, Washington; the Counties of Lincoln and Sweetwater, Wyoming; and with the Secretary of State of the States of Idaho, Montana, Oregon, Nevada, Washington and Wyoming; and

WHEREAS, the Maine Company or the Company has heretofore issued Bonds, under and in accordance with the terms of the Indenture in the following series and aggregate principal amounts:

which bonds are hereinafter sometimes called bonds of the First through Forty-third Series; and

WHEREAS, Section 22 and Section 121 of the Indenture provide that the Company may amend the Indenture to increase the maximum amount of the obligations to be secured by the Indenture by executing and delivering to the Trustee a supplemental indenture specifying the maximum amount of such obligations thereafter to be secured by the Indenture as so amended, and the Company has determined to increase the maximum amount of obligations to be secured by the Indenture to Three Billion Five Hundred Million Dollars ($3,500,000,000); and

WHEREAS, it is also now desired, for the purpose of more effectually carrying out the purposes of the Original Indenture, to confirm specifically the subjection to the lien thereof and of the Indenture of the certain property acquired by the Company in addition to the property specifically described in the Original Indenture and in said First, Second, Third, Fourth, Fifth, Sixth, Seventh, Ninth, Tenth, Eleventh, Twelfth, Thirteenth, Fourteenth, Sixteenth, Seventeenth, Eighteenth, Nineteenth, Twenty-first, Twenty-second, Twenty-third, Twenty-fourth, Twenty-fifth, Thirty-sixth, Thirty-seventh, Thirty-ninth, Fortieth, Forty-first, Forty-fourth, Forty-fifth, Forty-sixth, Forty-seventh, Forty-eighth, Forty-ninth and Fiftieth Supplemental Indentures; and

WHEREAS, the Company, in accordance with the provisions of the Indenture and pursuant to appropriate resolutions of its Board of Directors, has duly determined to make, execute and deliver to the Trustee this Fifty-first Supplemental Indenture to amend and supplement the Indenture for the purposes herein provided; and

WHEREAS, all things necessary to make the Original Indenture, as heretofore supplemented and as supplemented hereby, a valid and legally binding instrument for the security of the Bonds, have been performed:

NOW, THEREFORE, THIS INDENTURE WITNESSETH:

That in consideration of the premises and of One Dollar to it duly paid by the Trustee at or before the ensealing and delivery of these presents, the receipt whereof is hereby acknowledged, and in order to increase the maximum amount of obligations to be secured by the Indenture, according to their tenor and effect, and the performance of all the provisions of the Indenture and of said Bonds, the Company has duly executed and delivered to the Trustee this Fifty-first Supplemental Indenture and has granted, bargained, sold, released, conveyed, assigned, transferred, mortgaged, pledged, set over and confirmed and by these presents does grant, bargain, sell, release, convey, assign, transfer, mortgage, pledge, set over and confirm unto Deutsche Bank Trust Company Americas, as Trustee as aforesaid, and to its successor or successors in said trust, and to it and its successors and assigns forever, all property, whether real, personal or mixed (except any hereinafter expressly excepted), and wheresoever situated, acquired since the date of said Original Indenture by and now or hereafter owned by the Company including the following described properties, rights and interests in property (in addition to all other properties heretofore subjected to the lien of the Indenture and not heretofore released from the lien thereof)--that is to say:

None

None

All other property, whether real, personal or mixed (except any hereinafter expressly excepted), and wheresoever situated, acquired since the date of said Original Indenture by and now or hereafter owned by the Company.

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, and (subject to the provisions of Section 57 of the Original Indenture) the tolls, rents, revenues, issues, earnings, income, 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.

It is not intended herein or hereby to include in or subject to the lien of the Indenture, and the granting clauses hereof shall not be deemed to apply to, (1) any revenues, earnings, rents, issues, income or profits of the mortgaged and pledged property, or any bills, notes or accounts receivable, contracts or choses in action, except to the extent permitted by law in case a completed default specified in Section 65 of the Indenture shall have occurred and be continuing and the Trustee, or a receiver or trustee, shall have entered upon or taken possession of the mortgaged and pledged property, or (2) in any case, unless specifically subjected to the lien thereof, any bonds, notes, evidences of indebtedness, shares of stock, or other securities or any cash (except cash deposited with the Trustee pursuant to any provisions of the Indenture) or any goods, wares, merchandise, equipment or apparatus manufactured or acquired for the purpose of sale or resale in the usual course of business.

TO HAVE AND TO HOLD all such properties, real, personal and mixed, granted, bargained, sold, released, conveyed, assigned, transferred, mortgaged, pledged, set over or confirmed by the Company as aforesaid, or intended so to be, unto the Trustee (to the extent of its legal capacity to hold the same for the purposes hereof), and its successors, heirs and assigns forever;

IN TRUST, NEVERTHELESS, for the same purposes and upon the same terms, trusts and conditions and subject to and with the same provisions and covenants as are set forth in the Original Indenture, as amended or modified by said First, Second, Third, Fourth, Fifth, Sixth, Seventh, Eighth, Ninth, Tenth, Eleventh, Twelfth, Thirteenth, Fourteenth, Fifteenth, Sixteenth, Seventeenth, Eighteenth, Nineteenth, Twentieth, Twenty-first, Twenty-second, Twenty-third, Twenty-fourth, Twenty-fifth, Twenty-sixth, Twenty-seventh, Twenty-eighth, Twenty-ninth, Thirtieth, Thirty-first, Thirty-second, Thirty-third, Thirty-fourth, Thirty-fifth, Thirty-sixth, Thirty-seventh, Thirty-eighth, Thirty-ninth, Fortieth, Forty-first, Forty-second, Forty-third, Forty-fourth, Forty-fifth, Forty-sixth, Forty-seventh, Forty-eighth, Forty-ninth and Fiftieth Supplemental Indentures and this Fifty-first Supplemental Indenture.

And it is hereby covenanted, declared and decreed by and between the parties hereto, for the benefit of those who shall hold the Bonds and interest coupons, or any of them, issued and to be issued under the Indenture, as follows:

SECTION 1. Pursuant to Section 22 and Section 121 of the Indenture, the maximum amount of obligations to be secured by the Indenture is hereby increased to Three Billion Five Hundred Million Dollars ($3,500,000,000), provided, however, that the maximum amount of obligations to be secured by the Indenture may at any time and from time to time be further increased or decreased (but not below the amount of Bonds at the time outstanding thereunder) as provided in the Indenture.

SECTION 2. That all the terms, conditions, provisos, covenants and provisions contained in the Indenture shall affect and apply to the property hereinabove described and conveyed and to the estate, rights, obligations and duties of the Company and Trustee and the beneficiaries of the trust with respect to said property, and to the Trustee and its successors as trustee of said property, in the same manner and with the same effect as if the said property had been owned by the Company at the time of the execution of the Original Indenture and had been specifically and at length described in and conveyed to the Trustee (to the extent of its legal capacity to hold the same for the purposes of the Indenture) by the Original Indenture as a part of the property therein stated to be conveyed.

SECTION 3. That it is lawfully seized and possessed of all of the mortgaged and pledged property described in the granting clauses of the Indenture, which has not heretofore been released from the lien thereof; that it had or has, at the respective times of execution and delivery of the Original Indenture, the First, Second, Third, Fourth, Fifth, Sixth, Seventh, Eighth, Ninth, Tenth, Eleventh, Twelfth, Thirteenth, Fourteenth, Fifteenth, Sixteenth, Seventeenth, Eighteenth, Nineteenth, Twentieth, Twenty-first (as corrected by the Twenty-second), Twenty-second, Twenty-third, Twenty-fourth, Twenty-fifth, Twenty-sixth, Twenty-seventh, Twenty-eighth, Twenty-ninth, Thirtieth, Thirty-first, Thirty-second, Thirty-third, Thirty-fourth, Thirty-fifth, Thirty-sixth, Thirty-seventh, Thirty-eighth, Thirty-ninth, Fortieth, Forty-first, Forty-second, Forty-third, Forty-fourth, Forty-fifth, Forty-sixth, Forty-seventh, Forty-eighth, Forty-ninth and Fiftieth Supplemental Indentures and this Fifty-first Supplemental Indenture, good, right and lawful authority to mortgage and pledge the mortgaged and pledged property described therein, as provided in and by the Indenture; and that such mortgaged and pledged property is free and clear of any mortgage, lien, charge or encumbrance thereon or affecting the title thereto (other than excepted encumbrances) prior to the lien of the Indenture, except as set forth in the granting clauses of the Indenture.

SECTION 4. That it will deliver to the Trustee annually, within ninety (90) days after the close of each fiscal year, commencing with the fiscal year 2022, a certificate from the principal executive officer, principal financial officer or principal accounting officer as to his or her knowledge of the Company’s compliance with all conditions and covenants under the Indenture. For purposes of this Section 5, such compliance shall be determined without regard to any period of grace or requirement of notice provided under the Indenture.

The Trustee hereby accepts the trust hereby declared and provided and agrees to perform the same upon the terms and conditions in the Original Indenture, as heretofore supplemented and as supplemented by this Fifty-first Supplemental Indenture, and in this Fifty-first Supplemental Indenture set forth, and upon the following terms and conditions:

The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Fifty-first Supplemental Indenture or the due execution hereof by the Company or for or in respect of the recitals contained herein, all of which recitals are made by the Company only.

Capitalized terms used and not otherwise defined in this Fifty-first Supplemental Indenture shall have the meanings ascribed thereto in the Indenture.

In order to comply with laws, rules, regulations and executive orders in effect from time to time applicable to banking institutions, including those relating to the funding of terrorist activities and money laundering, the Trustee is required to obtain, verify and record certain information relating to individuals and entities which maintain a business relationship with the Trustee. Accordingly, each of the parties hereto agrees to provide to the Trustee upon its reasonable request from time to time identifying information and documentation as may be reasonably available to it in order to enable the Trustee to comply with such laws, rules, regulations and executive orders.

Except as hereby expressly amended and supplemented, the Original Indenture heretofore amended and supplemented is in all respects ratified and confirmed, and all the terms and provisions thereof shall be and remain in full force and effect.

This Fifty-first Supplemental Indenture may be executed in any number of counterparts, each of which when so executed shall be deemed to be an original; but such counterparts together constitute but one and the same instrument.

IN WITNESS WHEREOF, Idaho Power Company, party hereto of the first part, caused its corporate name to be hereunto affixed and this instrument to be signed and sealed by its President or a Vice President and its corporate seal to be attested by its Secretary or an Assistant Secretary for and on its behalf, and Deutsche Bank Trust Company Americas, party hereto of the second part, in token of its acceptance of the trust hereby created has caused its corporate name to be hereunto affixed and this instrument to be signed by a Vice President and attested by an Associate, on the date hereinafter acknowledged, as of the day and year first above written.

On the 14 day of October, in the year 2022, before me personally came LISA A. GROW, to me known, who being by me duly sworn did depose and say that she is the President and Chief Executive Officer of Idaho Power Company, one of the corporations described in and which executed the above instrument; that she knows the seal of said corporation; that the seal affixed to said instrument is such corporate seal; that it was so affixed by order of the Board of Directors of said corporation, and that she signed her name thereto by like order; the said LISA A. GROW, having personally appeared and known to me to be the President and Chief Executive Officer of said corporation that executed the instrument, acknowledged to me that said corporation executed the same.

IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal the day and year in this certificate first above written.

On the 13 day of October, in the year 2022, before me personally came Kenneth R. Ring, to me known, who being by me duly sworn did depose and say that he is a Director of Deutsche Bank Trust Company Americas, one of the corporations described in and which executed the above instrument and that he signed his name thereto by order of the Board of Directors of said corporation; the said Kenneth R. Ring, having personally appeared and known to me to be a Director of said corporation that executed the instrument, acknowledged to me that said corporation executed the same.

IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal the day and year in this certificate first above written.

On the 13 day of October, in the year 2022, before me personally came Irina Golovashchuk, to me known, who being by me duly sworn did depose and say that she is a Vice President of Deutsche Bank Trust Company Americas, one of the corporations described in and which executed the above instrument and that she signed her name thereto by order of the Board of Directors of said corporation; the said Irina Golovashchuk, having personally appeared and known to me to be a Vice President of said corporation that executed the instrument, acknowledged to me that said corporation executed the same.

IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal the day and year in this certificate first above written.

LISA A. GROW, being first duly sworn, upon oath, deposes and says: that she is an officer, to wit, the President and Chief Executive Officer of Idaho Power Company, a corporation, the mortgagor described in the foregoing indenture or mortgage, and makes this affidavit on behalf of said Idaho Power Company; that said indenture or mortgage is made in good faith without any design to hinder, delay or defraud creditors, to secure the indebtedness mentioned or provided for therein.

Kenneth R. Ring, being first duly sworn, upon oath, deposes and says: that he is an officer, to wit, a Director of Deutsche Bank Trust Company Americas, a corporation, one of the mortgagees and trustee named in the foregoing indenture or mortgage, and makes this affidavit on behalf of said Deutsche Bank Trust Company Americas; that said indenture or mortgage is made in good faith without any design to hinder, delay or defraud creditors, to secure the indebtedness mentioned or provided for therein.