EX-4.27





 Exhibit 4.27 

IDAHO POWER COMPANY 
 TO 

DEUTSCHE BANK TRUST COMPANY AMERICAS, 

Trustee 
 SUPPLEMENTAL INDENTURE

 Dated as of 
 TO 

INDENTURE 
 Dated as of
August 1, 2001 
 DEBT SECURITIES 












 SUPPLEMENTAL INDENTURE dated as of made and entered into by and between IDAHO POWER COMPANY, a
corporation of the State of Idaho (hereinafter, subject to Article XI of the Indenture, called the “Issuer” or the “Company”), having its principal office at 1221 West Idaho Street, Boise, Idaho 83702-5627, and DEUTSCHE BANK
TRUST COMPANY AMERICAS (formerly known as Bankers Trust Company), a banking corporation organized and existing under the laws of the State of New York, as Trustee (hereinafter, subject to Article VII of the Indenture, called the
“Trustee”), having its principal office at 1 Columbus Circle, 17th Floor, Mail Stop: NYC01-1710, New York, New York 10019, as Trustee under the Indenture for Debt Securities dated as of
August 1, 2001 executed and delivered by Idaho Power Company. 
 WHEREAS the Indenture dated as of August 1, 2001 (herein with all indentures
supplemental thereto called the “Indenture”), provides for the issuance of notes, debentures or other evidences of its indebtedness in one or more series (hereinafter called the “Securities”), unlimited in aggregate principal
amount; 
 WHEREAS the Indenture provides in Article III thereof that, prior to the issuance of Securities of any series, the form of such Securities and
the terms applicable to such series shall be established in, or pursuant to, the authority granted in a resolution of the Board of Directors (delivered to the Trustee in the form of a Board Resolution) or established in one or more indentures
supplemental thereto; 
 WHEREAS the Issuer desires by this Supplemental Indenture, among other things, to establish the form of the Securities of a series
of the Issuer, and to establish the terms applicable to such series, pursuant to Sections 3.1 and 10.1(e) of the Indenture; 
 WHEREAS the execution and
delivery of this Supplemental Indenture by the parties hereto are in all respects authorized by the provisions of the Indenture; and 
 WHEREAS all things
necessary have been done to make this Supplemental Indenture a valid agreement of the Issuer, in accordance with its terms. 
 NOW, THEREFORE, THIS
SUPPLEMENTAL INDENTURE WITNESSETH: 
 For and in consideration of the premises, it is mutually covenanted and agreed, as follows: 

ARTICLE I. 
 Notes, Series 

SECTION 1. The title of the series of the Securities established by this Supplemental Indenture shall be “     Notes, Series
             , due             ” of the Issuer (hereinafter called the “Series Notes”). The Series Notes shall
bear interest (computed on the basis of a 360-day year of twelve 30-day months) until the principal amount thereof has been duly paid or provided for in full, at a rate
per annum equal to     % and at the same rate per annum on any overdue principal or (to the extent legally enforceable) on any overdue installment of interest (the “Overdue Rate”). 

SECTION 2. The Series Notes shall be limited in aggregate principal amount to $             , and
shall be issued substantially in the form set forth in Exhibit A hereto (which is hereby incorporated herein and made a part hereof), subject to changes in the form thereof made by the Issuer and acceptable to the Trustee. The Series Notes shall
mature on . 
 Interest shall be payable [quarterly] in arrears on the day of              ,
            , and              (each, an “Interest Payment Date”) and at Maturity. If any Interest Payment Date would
otherwise be a day that is not a Business Day, such Interest Payment Date shall be postponed to the next day that is a Business Day. If Maturity would otherwise be a day that is not a Business Day, the payment of principal and interest due at
Maturity shall be made on the next day that is a Business Day and no interest shall accrue as a result of such delayed payment. 

  
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 Each payment of interest with respect of an Interest Payment Date or at Maturity shall include interest
accrued to but excluding such Interest Payment Date or Maturity, as the case may be (an “Interest Period”). 
 Interest on any Series Note that is
payable, and is punctually paid or duly provided for, on any Interest Payment Date shall be paid to the person in whose name such Series Note is registered at the close of business on the day of the month next preceding such Interest Payment Date
(the “Regular Record Date”). In the case of any Series Note issued between a Regular Record Date and the initial Interest Payment Date, interest for the period beginning on the date of issue and ending on the initial Interest Payment Date
shall be paid to the person to whom such Series Note shall have been originally issued. Notwithstanding the foregoing, any interest that is payable but not punctually paid or duly provided for on any Interest Payment Date shall forthwith cease to be
payable to the registered owner of such Series Note on such Regular Record Date, and may be paid to the person in whose name such Series Note is registered at the close of business on the Special Record Date established by the Issuer pursuant to
Section 3.8 of the Indenture or as otherwise provided in Section 3.8 of the Indenture. 
 Payments of interest on any Series Note (other than
interest payable at Maturity) will be made by mailing a check to the Holder at the address of the Holder appearing on the Securities Register on the applicable record date, unless otherwise agreed to by the Issuer. The principal amount thereof and
any premium and the interest payable at Maturity will be paid at Maturity against presentation of a Series Note at the office or agency of the Issuer maintained for that purpose in the Borough of Manhattan, The City of New York, or as otherwise
provided in the Indenture. 
 [The Series Notes are not redeemable prior to Maturity and the provisions of Article XIV of the Indenture are inapplicable.]

 [The Series Notes are not entitled to any sinking fund and the provisions of Article XV of the Indenture are inapplicable thereto.] 

The Series Notes are subject to the provisions of Article XII of the Indenture, which provide for the satisfaction and discharge of the Indenture under the
circumstances and on the conditions set forth therein. 
 SECTION 3. The Series Notes may be issued in whole or in part as one or more Global Securities and
The Depository Trust Company, or a nominee thereof, shall be the Depository for such Global Security or Global Securities, except in each case as otherwise provided in a Company Order with respect to any Series Notes. The Depository for such Global
Security or Global Securities representing Series Notes may surrender one or more Global Securities representing Series Notes in exchange in whole or in part for individual Series Notes on such terms as are acceptable to the Issuer and such
Depository and otherwise subject to the terms of Section 2.4 of the Indenture. 
 SECTION 4. The Issuer hereby appoints, or confirms the appointment
of, Deutsche Bank Trust Company Americas as the initial Trustee, Securities Registrar and Paying Agent, subject to the provisions of the Indenture with respect to resignation, removal and succession, and subject, further, to the right of the Issuer
to appoint additional agents (including Paying Agents). An Authenticating Agent may be appointed for the Series Notes under the circumstances set forth in, and subject to the provisions of, the Indenture. 

ARTICLE II. 
 Miscellaneous
Provisions 
 SECTION 1. The recitals contained herein shall be taken as the statements of the Issuer, and the Trustee assumes no responsibility for the
correctness of the same. The Trustee shall not be responsible for and makes no representation as to the validity, execution by any party other than the Trustee or sufficiency of this supplemental indenture. The Indenture, as supplemented by this
supplemental indenture, is in all respects hereby adopted, ratified and confirmed. 
 SECTION 2. The titles of the several Articles of this Supplemental
Indenture shall not be deemed to be any part hereof. 

  
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 SECTION 3. This Supplemental Indenture may be executed in any number of counterparts, each of which so
executed shall be deemed to be an original, but all such counterparts shall together constitute but one and the same instrument. 
 SECTION 4. Capitalized
terms used and not otherwise defined in this Supplemental Indenture shall have the meanings ascribed thereto in the Indenture. 
 SECTION 5. In case any
provision in this Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality, and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. 

SECTION 6. This Supplemental Indenture and any Securities issued hereunder shall be governed by and construed in accordance with the laws of the State of
Idaho, except that the obligations, rights and remedies of the Trustee hereunder shall be determined under the laws of the State of New York. 
 SECTION 7.
The Issuer represents and warrants to the Trustee that this Supplemental Indenture has been duly and validly executed and delivered by the Issuer and constitutes the Issuer’s legal, valid and binding obligation, enforceable against the Issuer
in accordance with its terms. 
 SECTION 8. The Trustee shall be entitled to all of the same rights, protections, immunities and indemnities set forth in
the Indenture as if specifically set forth herein. 
 SECTION 9. This Supplemental Indenture shall be binding upon and inure to the benefit of the parties
hereto and their respective successors and assigns. 
 SECTION 10. 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. 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed. 

 

			
	IDAHO POWER COMPANY
		
	By	 	  

		 	Name:
		 	Title:
	
	 DEUTSCHE BANK TRUST COMPANY AMERICAS

not in its individual capacity, but solely as Trustee

		
	By	 	  

		 	Name:
		 	Title:



  
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