# EDGAR Filing Document

**Accession Number:** 0000081020
**File Stem:** 0001104659-26-024731
**Filing Date:** 2026-3
**Character Count:** 187028
**Document Hash:** 1fb53f3f7a648a248088e1ceb37c0c10
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-024731.hdr.sgml**: 20260306

**ACCESSION NUMBER**: 0001104659-26-024731

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20260306

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260306

**DATE AS OF CHANGE**: 20260306

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Duke Energy Indiana, LLC
- **CENTRAL INDEX KEY:** 0000081020
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 350594457
- **STATE OF INCORPORATION:** IN
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-03543
- **FILM NUMBER:** 26731431

**BUSINESS ADDRESS:**
- **STREET 1:** 1000 EAST MAIN STREET
- **CITY:** PLAINFIELD
- **STATE:** IN
- **ZIP:** 46168
- **BUSINESS PHONE:** 704-382-3853

**MAIL ADDRESS:**
- **STREET 1:** 1000 EAST MAIN STREET
- **CITY:** PLAINFIELD
- **STATE:** IN
- **ZIP:** 46168

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Duke Energy Indiana, Inc.
- **DATE OF NAME CHANGE:** 20061003

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PSI ENERGY INC
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PUBLIC SERVICE CO OF INDIANA INC
- **DATE OF NAME CHANGE:** 19900509

?xml version='1.0' encoding='ASCII'?

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

**Washington, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the**

**Securities Exchange Act of 1934**

Date of Report (Date of earliest event reported): **March 6, 2026**

**DUKE ENERGY INDIANA, LLC**

(Exact Name of Registrant as Specified in its Charter)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Indiana** | &nbsp;&nbsp;**1-3543** | &nbsp;&nbsp;**35-0594457** |
| &nbsp;&nbsp;(State or Other Jurisdiction of<br> Incorporation or Organization) | &nbsp;&nbsp;(Commission File Number) | &nbsp;&nbsp;(IRS Employer<br> Identification No.) |

---

**1000 East Main Street, Plainfield, Indiana 46168**

(Address of Principal Executive Offices, including Zip code)

**(800) 488-3853**

(Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

◻ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

◻ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

◻ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

◻ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class:** | **Trading Symbol(s):** | **Name of each exchange on which registered:** |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

◻ Emerging growth company

◻ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

**Item 8.01. Other Events.**

On March 6, 2026, Duke Energy Indiana, LLC (the "Company") consummated the issuance and sale of the securities described below pursuant to an underwriting agreement, dated March 4, 2026 (the "Underwriting Agreement"), with BMO Capital Markets Corp., CIBC World Markets Corp., MUFG Securities Americas Inc. and U.S. Bancorp Investments, Inc., as representatives of the several underwriters named therein (the "Underwriters"), pursuant to which the Company agreed to issue and sell to the Underwriters $500,000,000 aggregate principal amount of the Company's First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036 (the "Bonds"). The Bonds were sold to the Underwriters at a discount to their principal amount. The Bonds were issued under the Company's Indenture of Mortgage or Deed of Trust, dated September 1, 1939, between the Company and Deutsche Bank National Trust Company, as Trustee, as amended and supplemented from time to time (the "Indenture"), including by the Seventy-Fourth Supplemental Indenture, dated as of March 6, 2026 (the "Supplemental Indenture"). The disclosure in this Item 8.01 is qualified in its entirety by the provisions of the Indenture, the Supplemental Indenture, which together with the form of global bond evidencing the Bonds, is filed as Exhibit 4.1 hereto, and the Underwriting Agreement, which is filed as Exhibit 99.1 hereto. Such exhibits are incorporated herein by reference. Also, in connection with the issuance and sale of the Bonds, the Company is filing a legal opinion regarding the validity of the Bonds as Exhibit 5.1 to this Form 8-K for the purpose of incorporating the opinion into the Company's Registration Statement on Form S-3, No. 333-290475-03.

**Item 9.01. Financial Statements and Exhibits.**

(d) Exhibits

---

| | |
|:---|:---|
| **Exhibit** | **Description** |
| [Exhibit 4.1](tm268077d1_ex4-1.htm) | [Seventy-Fourth Supplemental Indenture, dated as of March 6, 2026, between the Company and Deutsche Bank National Trust Company, as Trustee and form of global bond.](tm268077d1_ex4-1.htm) |
| [Exhibit 5.1](tm268077d1_ex5-1.htm) | [Opinion regarding validity of the Bonds.](tm268077d1_ex5-1.htm) |
| [Exhibit 23.1](tm268077d1_ex5-1.htm) | [Consent (included as part of Exhibit 5.1).](tm268077d1_ex5-1.htm) |
| [Exhibit 99.1](tm268077d1_ex99-1.htm) | [Underwriting Agreement, dated March 4, 2026, among the Company, BMO Capital Markets Corp., CIBC World Markets Corp., MUFG Securities Americas Inc. and U.S. Bancorp Investments, Inc., as representatives of the several underwriters named therein.](tm268077d1_ex99-1.htm) |
| Exhibit 104 | Cover Page Interactive Data file (the Cover Page Interactive Data file is embedded within the Inline XBRL document) |

---

**SIGNATURE**

Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | | |
|:---|:---|:---|:---|
|  | DUKE ENERGY INDIANA, LLC | DUKE ENERGY INDIANA, LLC | DUKE ENERGY INDIANA, LLC |
| Date: March 6, 2026 |  |  |  |
|  | By: | /s/ Elizabeth H. Jones | /s/ Elizabeth H. Jones |
|  |  | Name: | Elizabeth H. Jones |
|  |  | Title: | Assistant Secretary |

---

## Exhibit 4.1

**Exhibit 4.1**

**Seventy-FOURTH SUPPLEMENTAL<br> INDENTURE**

**TO**

**INDENTURE DATED SEPTEMBER 1, 1939**

**DUKE ENERGY INDIANA, LLC**

**TO**

**DEUTSCHE BANK NATIONAL TRUST COMPANY<br> AS TRUSTEE**

**DATED AS OF March 6, 2026**

**CREATING<br> FIRST MORTGAGE BONDS, Series DDDD, 4.95%, DUE March 15, 2036**

**AND**

**OTHERWISE SUPPLEMENTING AND AMENDING THE INDENTURE**

**TABLE OF CONTENTS**

**<u>Page</u>**

---

| | |
|:---|:---|
| PARTIES: |  |
| Company (Duke Energy Indiana, LLC, formerly named Duke Energy Indiana, Inc., formerly named each of PSI Energy, Inc. and Public Service Company of Indiana, Inc., and successor by consolidation to Initial Mortgagor (Public Service Company of Indiana)), and Trustee | 1 |
| RECITALS: |  |
| Indenture of the Initial Mortgagor, dated September 1, 1939, and First Supplemental Indenture thereto of the Initial Mortgagor, dated as of March 1, 1941 | 1 |
| Consolidation of Initial Mortgagor (and four other companies) into the Company | 1 |
| Execution by Company of Second Supplemental Indenture to the original Indenture | 1 |
| Company substituted for Initial Mortgagor under Indenture | 1 |
| Execution by Company of Third through the Seventy-Second Supplemental Indentures to the original Indenture | 2 |
| LaSalle Bank National Association appointed as Successor Trustee | 2 |
| Resignation of Bank of America, N.A., as successor by merger to LaSalle Bank National Association, and appointment of Deutsche Bank National Trust Company as Successor Trustee | 2 |
| Change of name of Company from Public Service Company of Indiana, Inc. to PSI Energy, Inc., to Duke Energy Indiana, Inc., and thereafter to Duke Energy Indiana, LLC | 3 |
| Amount of bonds presently outstanding under the Indenture | 3 |
| Seventy-Fourth Supplemental Indenture and Bonds of Series DDDD authorized | 3 |
| Conditions precedent performed | 3 |
| EXECUTING CLAUSE | 3 |

---

---

| | | |
|:---|:---|:---|
| ARTICLE I. | ARTICLE I. | ARTICLE I. |
| FIRST MORTGAGE BONDS, SERIES DDDD, 4.95%, DUE MARCH 15, 2036 | FIRST MORTGAGE BONDS, SERIES DDDD, 4.95%, DUE MARCH 15, 2036 | 4 |
| *Section 1.* | Creation and designation of Bonds of Series DDDD | 4 |
| *Section 2.* | Bonds of Series DDDD to be in registered form only | 4 |
|  | Form of Face of Bond Of Series DDDD | 7 |
|  | Form of Reverse of Bond of Series DDDD | 9 |
|  | Form of Trustee's Certificate | 13 |
| *Section 3.* | Date of Bonds of Series DDDD | 14 |
| *Section 4.* | Maturity date, interest rate and payment date, and principal payment of Bonds of Series DDDD | 14 |
| *Section 5.* | Place and manner of payment of Bonds of Series DDDD | 14 |
| *Section 6.* | Denominations and numbering of definitive Bonds of Series DDDD | 14 |
|  | Temporary Bonds of Series DDDD and exchange thereof for definitive bonds | 14 |
| *Section 7.* | Maintenance and Renewal Fund shall not apply to Bonds of Series DDDD | 14 |

---

ii

---

| | | |
|:---|:---|:---|
| *Section 8.* | Inspection requirements shall not apply to Bonds of Series DDDD | 15 |
| *Section 9.* | Company's right to further amend the original Indenture | 15 |
| *Section 10.* | No sinking fund for Bonds of Series DDDD | 16 |
| ARTICLE II. | ARTICLE II. | ARTICLE II. |
| ISSUANCE OF BONDS OF SERIES DDDD. | ISSUANCE OF BONDS OF SERIES DDDD. | 16 |
| *Section 1.* | Aggregate principal amount of Bonds of Series DDDD issuable at once | 16 |
| *Section 2.* | Issuance of additional Bonds of Series DDDD | 16 |
| ARTICLE III. | ARTICLE III. | ARTICLE III. |
| INDENTURE AMENDMENTS. | INDENTURE AMENDMENTS. | 16 |
| *Section 1.* | Amendments to Article I of the original Indenture | 16 |
| *Section 2.* | Amendments to Article VII of the original Indenture | 16 |
| ARTICLE IV. | ARTICLE IV. | ARTICLE IV. |
| CONCERNING THE TRUSTEE. | CONCERNING THE TRUSTEE. | 19 |
| Acceptance of trusts by Trustee | Acceptance of trusts by Trustee | 19 |
| Trustee not responsible for validity or sufficiency of Seventy-Fourth Supplemental Indenture, etc. | Trustee not responsible for validity or sufficiency of Seventy-Fourth Supplemental Indenture, etc. | 19 |
| Terms and conditions of Article XVII of the original Indenture to be applied to the Seventy-Fourth Supplemental Indenture | Terms and conditions of Article XVII of the original Indenture to be applied to the Seventy-Fourth Supplemental Indenture | 19 |
| ARTICLE V. | ARTICLE V. | ARTICLE V. |
| MISCELLANEOUS PROVISIONS. | MISCELLANEOUS PROVISIONS. | 19 |
| *Section 1.* | References in any article or section of the original Indenture refer to such article or section as amended by all seventy-four Supplemental Indentures thereto | 19 |
| *Section 2.* | Operation and construction of amendments to the original Indenture | 19 |
| *Section 3.* | All covenants, etc., for sole benefit of parties to the Seventy-Fourth Supplemental Indenture and holders of bonds | 19 |
| *Section 4.* | Table of contents and headings of articles not part of Seventy-Fourth Supplemental Indenture | 19 |
| *Section 5.* | Execution of Seventy-Fourth Supplemental Indenture in counterparts; Electronic Signatures | 20 |
| *Section 6.* | Payments due on non-Business Days | 20 |
| ATTESTATION CLAUSE | ATTESTATION CLAUSE | 21 |
| SIGNATURES | SIGNATURES | 22 |
| ACKNOWLEDGMENT BY COMPANY | ACKNOWLEDGMENT BY COMPANY | 23 |
| ACKNOWLEDGMENT BY TRUSTEE | ACKNOWLEDGMENT BY TRUSTEE | 24 |

---

iii

SEVENTY-FOURTH SUPPLEMENTAL INDENTURE dated as of the 6th day of March, 2026, made and entered into by and between DUKE ENERGY INDIANA, LLC (hereinafter commonly referred to as the "Company"), a limited liability company organized and existing under the laws of the State of Indiana, formerly named Duke Energy Indiana, Inc., and formerly named each of PSI Energy, Inc. and Public Service Company of Indiana, Inc., and the successor by consolidation to Public Service Company of Indiana, an Indiana corporation, party of the first part, and DEUTSCHE BANK NATIONAL TRUST COMPANY, a national banking association organized and existing under the laws of the United States and having its office or place of business in the City of Chicago, State of Illinois, successor trustee to Bank of America, N.A., as successor by merger to LaSalle Bank National Association, which was the successor trustee to The First National Bank of Chicago (hereinafter commonly referred to as the "Trustee"), party of the second part, PARTIES:

WITNESSETH:

WHEREAS, Public Service Company of Indiana (hereinafter commonly referred to as the "Initial Mortgagor"), prior to its consolidation with certain other corporations to form the Company, executed and delivered to the Trustee a certain indenture of mortgage or deed of trust (hereinafter called the "original Indenture" when referred to as existing prior to any amendment thereto, and the "Indenture" when referred to as heretofore, now or hereafter amended), dated September 1, 1939, and a First Supplemental Indenture thereto, dated as of March 1, 1941, to secure the bonds of the Initial Mortgagor, its successors and assigns, issued from time to time under the Indenture in series for the purposes of and subject to the limitations specified in the Indenture; and

WHEREAS, the Company on September 6, 1941, became, through a consolidation, the successor of the Initial Mortgagor (and four other companies) and succeeded to all the rights and became liable for all the obligations of the Initial Mortgagor (and such other companies); and

WHEREAS, after said consolidation, the Company executed and delivered a Second Supplemental Indenture, dated as of November 1, 1941, to the original Indenture for the purposes, among others, of (i) the making by the Company of an agreement of assumption and adoption by it of the Indenture, (ii) the assumption by the Company of the bonds (and interest and premium, if any, thereon) issued or to be issued under the Indenture, and of all terms, covenants and conditions binding upon it under the Indenture, and the agreeing by the Company to pay, perform and fulfill the same, and (iii) the conveying to the Trustee upon the trusts declared in the Indenture, but subject to any outstanding liens and encumbrances, all the property which the Company then owned or which it might thereafter acquire, except property of a character similar to the property of the Initial Mortgagor which is excluded from the lien of the Indenture; and

WHEREAS, all conditions have been met and all acts and things necessary have been done and performed to make the Indenture the valid and binding agreement of the Company and to substitute the Company for the Initial Mortgagor under the Indenture, and to vest the Company with each and every right and power of the Initial Mortgagor, including the right and power to issue bonds thereunder; and

WHEREAS, the Company has subsequently executed and delivered, for purposes authorized under the Indenture, a Third Supplemental Indenture dated as of March 1, 1942, a Fourth Supplemental Indenture dated as of May 1, 1943, a Fifth Supplemental Indenture dated as of August 1, 1944, a Sixth Supplemental Indenture dated as of September 1, 1945, a Seventh Supplemental Indenture dated as of November 1, 1947, an Eighth Supplemental Indenture dated as of January 1, 1949, a Ninth Supplemental Indenture dated as of May 1, 1950, a Tenth Supplemental Indenture dated as of July 1, 1952, an Eleventh Supplemental Indenture dated as of January 1, 1954, a Twelfth Supplemental Indenture dated as of October 1, 1957, a Thirteenth Supplemental Indenture dated as of February 1, 1959, a Fourteenth Supplemental Indenture dated as of July 15, 1960, a Fifteenth Supplemental Indenture dated as of June 15, 1964, a Sixteenth Supplemental Indenture dated as of January 1, 1969, a Seventeenth Supplemental Indenture dated as of March 1, 1970, an Eighteenth Supplemental Indenture dated as of January 1, 1971, a Nineteenth Supplemental Indenture dated as of January 1, 1972, a Twentieth Supplemental Indenture dated as of February 1, 1974, a Twenty-First Supplemental Indenture dated as of August 1, 1974, a Twenty-Second Supplemental Indenture dated as of August 1, 1975, a Twenty-Third Supplemental Indenture dated as of January 1, 1977, a Twenty-Fourth Supplemental Indenture dated as of October 1, 1977, a Twenty-Fifth Supplemental Indenture dated as of September 1, 1978, a Twenty-Sixth Supplemental Indenture dated as of September 1, 1978, a Twenty-Seventh Supplemental Indenture dated as of March 1, 1979, a Twenty-Eighth Supplemental Indenture dated as of May 1, 1979, a Twenty-Ninth Supplemental Indenture dated as of March 1, 1980, a Thirtieth Supplemental Indenture dated as of August 1, 1980, a Thirty-First Supplemental Indenture dated as of February 1, 1981, a Thirty-Second Supplemental Indenture dated as of August 1, 1981, a Thirty-Third Supplemental Indenture dated as of December 1, 1981, a Thirty-Fourth Supplemental Indenture dated as of December 1, 1982, a Thirty-Fifth Supplemental Indenture dated as of March 30, 1984, a Thirty-Sixth Supplemental Indenture dated as of November 15, 1984, a Thirty-Seventh Supplemental Indenture dated as of August 15, 1985, a Thirty-Eighth Supplemental Indenture dated as of October 1, 1986, a Thirty-Ninth Supplemental Indenture dated as of March 15, 1987, a Fortieth Supplemental Indenture dated as of June 1, 1987, a Forty-First Supplemental Indenture dated as of June 15, 1988, a Forty-Second Supplemental Indenture dated as of August 1, 1988, a Forty-Third Supplemental Indenture dated as of September 15, 1989, a Forty-Fourth Supplemental Indenture dated as of March 15, 1990, a Forty-Fifth Supplemental Indenture dated as of March 15, 1990, a Forty-Sixth Supplemental Indenture dated as of June 1, 1990, a Forty-Seventh Supplemental Indenture dated as of July 15, 1991, a Forty-Eighth Supplemental Indenture dated as of July 15, 1992, a Forty-Ninth Supplemental Indenture dated as of February 15, 1993, a Fiftieth Supplemental Indenture dated as of February 15, 1993, a Fifty-First Supplemental Indenture dated as of February 1, 1994, a Fifty-Second Supplemental Indenture dated as of April 30, 1999, a Fifty-Third Supplemental Indenture dated as of June 15, 2001, a Fifty-Fourth Supplemental Indenture dated as of September 1, 2002, a Fifty-Fifth Supplemental Indenture dated as of February 15, 2003, a Fifty-Sixth Supplemental Indenture dated as of December 1, 2004, a Fifty-Seventh Supplemental Indenture dated as of August 21, 2008, a Fifty-Eighth Supplemental Indenture dated as of December 19, 2008, a Fifty-Ninth Supplemental Indenture dated as of March 23, 2009, a Sixtieth Supplemental Indenture dated as of June 1, 2009, a Sixty-First Supplemental Indenture dated as of October 1, 2009, a Sixty-Second Supplemental Indenture dated as of July 9, 2010, a Sixty-Third Supplemental Indenture dated as of September 23, 2010, a Sixty-Fourth Supplemental Indenture dated as of December 1, 2011, a Sixty-Fifth Supplemental Indenture dated as of March 15, 2012, a Sixty-Sixth Supplemental Indenture dated as of July 11, 2013, a Sixty-Seventh Supplemental Indenture dated as of January 1, 2016, a Sixty-Eighth Supplemental Indenture dated as of May 12, 2016, a Sixty-Ninth Supplemental Indenture dated as of September 27, 2019, a Seventieth Supplemental Indenture dates as of March 12, 2020, a Seventy-First Supplemental Indenture dated as of March 23, 2023, a Seventy-Second Supplemental Indenture dated as of March 1, 2024 and a Seventy-Third Supplemental Indenture dated as of May 15. 2025, each supplementing and amending the Indenture; and

WHEREAS, the Thirty-Fifth Supplemental Indenture authorized and appointed LaSalle Bank National Association, a national banking association duly organized and existing under the laws of the United States of America with its principal office in Chicago, Illinois and formerly named LaSalle National Bank, as Successor Trustee to The First National Bank of Chicago, which appointment was accepted, and all trust powers under the Indenture were thereby transferred from The First National Bank of Chicago to LaSalle Bank National Association; and

WHEREAS, by an Instrument of Resignation, Appointment and Acceptance dated as of December 15, 2008, Bank of America, N.A., as successor by merger to LaSalle Bank National Association, resigned as trustee and the Company appointed the Trustee as Successor Trustee thereto, which appointment was thereby accepted by the Trustee effective as of that date, and all trust powers were thereby transferred from Bank of America, N.A. to the Trustee; and

WHEREAS, the Forty-Sixth Supplemental Indenture amended the Indenture to reflect a change in the name of the Company from Public Service Company of Indiana, Inc. to PSI Energy, Inc. effective as of April 20, 1990, the Fifty-Seventh Supplemental Indenture amended the Indenture to reflect a change in the name of the Company from PSI Energy, Inc. to Duke Energy Indiana, Inc., effective as of October 1, 2006, and the Sixty-Seventh Supplemental Indenture amended the Indenture to reflect the Company's conversion of its form of organization effective January 1, 2016 from an Indiana corporation to an Indiana limited liability company named "Duke Energy Indiana, LLC"; and

WHEREAS, as of March 6, 2026, the only bonds that have been heretofore issued under the Indenture which are now outstanding are $38,000,000 aggregate principal amount of "PSI Energy, Inc. First Mortgage Bonds, Series DDD, 8.31%, Due September 1, 2032" and $500,000,000 aggregate principal amount of "Duke Energy Indiana, Inc. First Mortgage Bonds, Series LLL, 6.35%, Due August 15, 2038" and $450,000,000 aggregate principal amount of "Duke Energy Indiana, Inc. First Mortgage Bonds, Series MMM, 6.45%, Due April 1, 2039" and $250,000,000 aggregate principal amount of "Duke Energy Indiana, Inc. First Mortgage Bonds, Series UUU, 4.20%, Due March 15, 2042" and $350,000,000 aggregate principal amount of "Duke Energy Indiana, Inc. First Mortgage Bonds, Series WWW, 4.90%, Due July 15, 2043" and $500,000,000 aggregate principal amount of "Duke Energy Indiana, LLC First Mortgage Bonds, Series XXX, 3.75%, Due May 15, 2046" and $500,000,000 aggregate principal amount of "Duke Energy Indiana, LLC First Mortgage Bonds, Series YYY, 3.25%, Due October 1, 2049" and $550,000,000 aggregate principal amount of "Duke Energy Indiana, LLC First Mortgage Bonds, Series ZZZ, 2.75%, Due April 1, 2050" and $500,000,000 aggregate principal amount of "Duke Energy Indiana, LLC First Mortgage Bonds, Series AAAA, 5.40%, Due April 1, 2053" and $300,000,000 aggregate principal amount of "Duke Energy Indiana, LLC First Mortgage Bonds, Series BBBB, 5.25%, Due March 1, 2034"; and

WHEREAS, in accordance with the provisions of Section 1 of Article XVIII of the Indenture, the Board of Directors has authorized the execution and delivery by the Company of a Seventy-Fourth Supplemental Indenture, substantially in the form of this Seventy-Fourth Supplemental Indenture, for the purpose of creating a seventy-fourth series of bonds to be issued under the Indenture, to be known as "Duke Energy Indiana, LLC First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036" (such bonds being hereinafter referred to as the "Bonds of Series DDDD"), and prescribing the form and substance of the Bonds of Series DDDD and the terms, provisions and characteristics thereof, and for the purpose of adding to the covenants and agreements of the Company for the protection of the bondholders and of the trust estate, of providing the terms and conditions for the redemption of the Bonds of Series DDDD, of adding certain other covenants and undertakings with respect to the Bonds of Series DDDD and of making such changes in the Indenture as are deemed necessary or desirable and as are permitted by the Indenture; and

WHEREAS, all conditions and requirements necessary to make this Seventy-Fourth Supplemental Indenture a valid, binding and legal instrument have been done, performed and fulfilled and the execution and delivery hereof have been in all respects duly authorized:

NOW, THEREFORE, in consideration of the premises, and of the acceptance and purchase of the Bonds of Series DDDD by the holders and registered owners thereof, and of the sum of One Dollar ($1.00) duly paid by the Trustee to the Company, the receipt whereof is hereby acknowledged, and in accordance with and subject to the terms and provisions of the Indenture, the Company and the Trustee, respectively, have entered into, executed and delivered this Seventy-Fourth Supplemental Indenture for the uses and purposes hereinafter expressed, that is to say:

ARTICLE I.

FIRST MORTGAGE BONDS, Series DDDD, 4.95%, DUE March 15, 2036

*Section 1.* There are hereby created a seventy-fourth series of bonds to be issued under and secured by the Indenture, to be designated as "Duke Energy Indiana, LLC First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036" (such series being the Bonds of Series DDDD hereinbefore referred to).

*Section 2.* The following provisions shall apply to the Bonds of Series DDDD.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The Bonds of Series DDDD shall be issued in fully registered form only. However, except as provided elsewhere in this Section, the registered owner of all of the Bonds of Series DDDD initially shall be The Depository Trust Company ("DTC") or its nominee, and such Bonds of Series DDDD initially shall be registered in the name of DTC or its nominee. Payment of the principal of or interest on Bonds registered in the name of DTC or its nominee shall be made in the manner specified in DTC's rules and by-laws. DTC (and any successor securities depository) and its (or their) participating institutions (each, a "Participant") shall maintain a book-entry registration and transfer system with respect to ownership of beneficial interests in the Bonds of Series DDDD (the "Book-Entry System").

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) The Bonds of Series DDDD initially shall be issued in the form of one or more authenticated, fully registered bonds for such series (each, a "Global Security") which (i) need not be in the form of a lithographed or engraved certificate, but may be typewritten or printed on ordinary paper or such paper as the Trustee may reasonably request, (ii) shall represent and be denominated in an amount equal to 100% of the aggregate principal amount of the Bonds of Series DDDD issued under this Supplemental Indenture, (iii) shall be executed by the Company and authenticated by the Trustee in accordance with the provisions of the Indenture, (iv) shall be registered in the name of DTC or its nominee, and delivered to DTC or its nominee or a custodian therefor, and (v) shall contain the following legend on the face thereof:

Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation ("DTC"), to issuer or its agent for registration of transfer, exchange or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered holder hereof, Cede & Co., has an interest herein.

Unless and until it is exchanged in whole or in part for Bonds of Series DDDD in definitive certificated form, each Global Security representing the Bonds of Series DDDD may not be transferred except as a whole by DTC to a nominee of DTC or by a nominee of DTC to DTC or another nominee of DTC or by DTC or any such nominee to a successor securities depository or a nominee of any such successor securities depository.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) The Trustee and the Company may treat Cede & Co. or its nominee, or any successor securities depository or nominee thereof (collectively, the "Depository") as the sole and exclusive owner of the Bonds of Series DDDD, registered in its name for the purposes of payment of the principal or redemption price of or interest on the Bonds of Series DDDD, giving any notice permitted or required to be given to holders of the Bonds of Series DDDD under the Indenture or this Supplemental Indenture, registering the transfer of the Bonds of Series DDDD, obtaining any consent or other action to be taken by holders of the Bonds of Series DDDD, and for all other purposes whatsoever and neither the Trustee nor the Company shall be affected by any notice to the contrary. Neither the Company nor the Trustee nor any registrar nor any paying agent shall have any responsibility or obligation to any Participant, any person claiming a beneficial ownership interest in the Bonds of Series DDDD under or through the Depository or any Participant, or any other person which is not shown on the registration books as being a holder of the Bonds of Series DDDD with respect to (i) the accuracy of any records maintained by the Depository or any Participant; (ii) the payment by the Depository to any Participant of any amount in respect of the principal or interest on the Bonds of Series DDDD or the redemption price of the Bonds of Series DDDD; (iii) the payment by any Participant to any owner of a beneficial ownership interest in the Bonds of Series DDDD, in respect of the principal of or interest on the Bonds of Series DDDD or (iv) any consent or other action taken by the Depository as owner of the Bonds of Series DDDD. The Trustee shall pay all principal of and interest on the Bonds of Series DDDD only to or upon the order of the registered holder or holders of the Bonds of Series DDDD, as shown on the registration books, and all such payments shall be valid and effective to fully satisfy and discharge the Company's obligations with respect to the principal or redemption price of and interest on the Bonds of Series DDDD, to the extent of the sum or sums so paid. No person other than a holder of the Bonds of Series DDDD, as shown on the registration books of DTC, shall receive an authenticated Bond evidencing the obligation of the Company to make payment of the principal of and interest on the Bonds of Series DDDD, pursuant to the Indenture and this Supplemental Indenture. Upon delivery by DTC to the Trustee of written notice to the effect that DTC has determined to substitute a new nominee for Cede & Co, and subject to the provisions of the Indenture and this Supplemental Indenture, the word "Cede & Co.", as used in this Supplemental Indenture, shall refer to each new nominee of DTC.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) In the event that after the occurrence of an event of default relating to the Bonds of Series DDDD that has not been cured or waived, holders of a majority in aggregate principal amount of the beneficial interests in the Bonds of Series DDDD, as reflected in the books and records of the Depository, notify the Trustee, through the Depository or any Participant, that the continuation of the Book-Entry System is no longer in the best interests of such holders of beneficial interests in the Bonds of Series DDDD, then the Trustee shall notify the Depository and the Company, and the Depository will notify each Participant of the availability through the Depository of definitive certificated Bonds of Series DDDD.

In such event, the Company shall execute, and the Trustee, upon receipt of a written order of the Company, signed by its President or a Vice President and by its Treasurer, Assistant Treasurer, Secretary or Assistant Secretary (an "Issuer Order"), for the authentication and delivery of definitive certificated Bonds of Series DDDD, will authenticate and deliver Bonds of Series DDDD in definitive certificated form, in any authorized denominations, all pursuant to the provisions of the Indenture, to the person or persons specified to the Trustee in writing by the Depository in the aggregate principal amount of the Global Security or Securities and in exchange for such Global Security or Securities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) If at any time the Depository notifies the Company that it is unwilling or unable to continue as Depository for the Bonds of Series DDDD, or if at any time the Depository shall no longer be registered as a clearing agency in good standing under the Securities Exchange Act of 1934, as amended, or other applicable statute or regulation, the Company may appoint a successor Depository with respect to the Bonds of Series DDDD. If a successor Depository for the Bonds of Series DDDD is not appointed by the Company within 90 days after the Company receives such notice or becomes aware of such condition, the Company will execute, and the Trustee, upon receipt of an Issuer Order for the authentication and delivery of definitive certificated Bonds of Series DDDD, will authenticate and deliver Bonds of Series DDDD in definitive certificated form, in any authorized denominations, all pursuant to the provisions of the Indenture, to the person or persons specified to the Trustee in writing by the Depository in the aggregate principal amount of the Global Security or Securities and in exchange for such Global Security or Securities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) The Company may at any time and in its sole discretion determine that the Bonds of Series DDDD shall no longer be represented by a Global Security or Securities. In such event the Company will execute, and the Trustee, upon receipt of an Issuer Order for the authentication and delivery of definitive certificated Bonds of Series DDDD, will authenticate and deliver the Bonds of Series DDDD in definitive certificated form, in any authorized denominations, all pursuant to the provisions of the Indenture, to the person or persons specified to the Trustee in writing by the Depository in the aggregate principal amount of the Global Security or Securities and in exchange for such Global Security or Securities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) Upon the exchange of any Global Security for the Bonds of Series DDDD in definitive certificated form, in authorized denominations, the Global Security or Securities shall be cancelled by the Trustee.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) Whenever the Depository requests the Company and the Trustee to do so, the Trustee and the Company will cooperate with the Depository in taking appropriate action after reasonable notice to (i) make available one or more separate Global Securities evidencing the Bonds of Series DDDD to any Participant having Bonds of Series DDDD credited to its account at the Depository, or (ii) arrange for another Depository to maintain custody of the Global Security or Securities evidencing the Bonds of Series DDDD.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) In connection with any notice or other communication to be provided to holders of the Bonds of Series DDDD pursuant to the Indenture and this Supplemental Indenture by the Company or the Trustee with respect to any consent or other action to be taken by holders of the Bonds of Series DDDD, the Company or the Trustee, as the case may be, shall establish a record date for such consent or other action and give the Depository notice of such record date not less than 15 calendar days in advance of such record date to the extent possible. Such notice to the Depository shall be given only so long as a Depository or its nominee is the sole holder of the Bonds of Series DDDD.

The Bonds of Series DDDD and the Trustee's certificate to be endorsed thereon shall be substantially in the following forms, respectively:

[THE REMAINDER OF THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY.]

(FORM OF FACE OF BOND OF Series DDDD)

[Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation ("DTC"), to issuer or its agent for registration of transfer, exchange or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered holder hereof, Cede & Co., has an interest herein.]<sup>1</sup>

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|:---|:---|
| No. DDDD-R- | $|

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CUSIP No: 26443T AG1

ISIN: US26443TAG13

DUKE ENERGY INDIANA, LLC<br> FIRST MORTGAGE BOND, Series DDDD, 4.95%,<br> DUE March 15, 2036

Duke Energy Indiana, LLC, an Indiana limited liability company (hereinafter called the "Company"), for value received, hereby promises to pay to , or registered assigns, the principal sum of Dollars ($) on the fifteenth day of March, 2036 and to pay interest on said sum from the date hereof, until said principal sum is paid, at the rate of 4.95% per annum, payable semi-annually on the fifteenth day of March and September in each year, beginning on September 15, 2026. Both the principal of and the interest on this bond shall be payable in any coin or currency of the United States of America which at the time of payment is legal tender for the payment of public and private debts at the office or agency of the Company in Plainfield, Indiana, or, at the option of the registered owner hereof, at the office or agency of the Company in the Borough of Manhattan, The City of New York, State of New York, except that interest on this bond may be paid, at the option of the Company, by check or draft mailed to the address of the person entitled thereto as it appears on the books of the Company maintained for that purpose.

REFERENCE IS MADE TO THE FURTHER PROVISIONS OF THIS BOND SET FORTH ON THE REVERSE HEREOF. SUCH FURTHER PROVISIONS SHALL FOR ALL PURPOSES HAVE THE SAME EFFECT AS THOUGH FULLY SET FORTH AT THIS PLACE.

This bond shall not be valid or become obligatory for any purpose unless and until it shall have been authenticated by the execution by the Trustee, or its successor in trust under the Indenture, of the certificate endorsed hereon.

<sup>1</sup> This should be included only if the Bonds of Series DDDD are being issued in global form.

IN WITNESS WHEREOF, Duke Energy Indiana, LLC has caused this bond to be executed in its name by the manual, electronic or facsimile signature of its President or an Executive Vice President or one of its Vice Presidents, and its company seal or a facsimile thereof to be hereto affixed and attested by the manual or facsimile signature of its Secretary or one of its Assistant Secretaries.

Dated as of:

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| | |
|:---|:---|
| DUKE ENERGY INDIANA, LLC | DUKE ENERGY INDIANA, LLC |
| By | |
| | President |

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| | |
|:---|:---|
| ATTEST: | ATTEST: |
| | Secretary |

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(FORM OF REVERSE OF BOND OF Series DDDD)

This bond is one of the bonds of the Company issued and to be issued from time to time under and in accordance with and all secured by an indenture of mortgage or deed of trust, dated September 1, 1939, from Public Service Company of Indiana (predecessor of the Company) to The First National Bank of Chicago, as Trustee, to which Deutsche Bank National Trust Company is successor trustee (which indenture as amended by all supplemental indentures is hereinafter referred to as the "Indenture"). Said Trustee or its successor in trust under the Indenture is hereinafter sometimes referred to as the "Trustee." Reference is hereby made to the Indenture for a description of the property mortgaged and pledged and the nature and extent of the security for said bonds. By the terms of the Indenture, the bonds secured thereby are issuable in series which may vary as to date, amount, dates of maturity, rate of interest and in other respects as in the Indenture provided.

The rights and obligations of the Company and of the bearers and registered owners of bonds may be modified or amended with the consent of the Company by an affirmative vote of the bearers or registered owners entitled to vote of at least seventy-five per centum (75%) in principal amount of the bonds then outstanding at a meeting of bondholders called for the purpose (and by an affirmative vote of the bearers or registered owners entitled to vote of at least seventy-five per centum (75%) in principal amount of bonds of any series affected by such modification or amendment in case one or more, but less than all, series of bonds are so affected), all in the manner and subject to the limitations set forth in the Indenture, any consent by the bearer or registered owner of any bond being conclusive and binding upon such bearer or registered owner and upon all future bearers or registered owners of such bond, irrespective of whether or not any notation of such consent is made on such bond; provided that no such modification or amendment shall, among other things, extend the maturity or reduce the amount of, or reduce the rate of interest on, or otherwise modify the terms of the payment of the principal of, or interest or premium (if any) on this bond, which obligations are absolute and unconditional, or permit the creation of any lien ranking prior to or equal with the lien of the Indenture on any of the mortgaged property. The Seventy-Fourth Supplemental Indenture provides that at any time when no bonds issued under the Indenture prior to the issuance of the "PSI Energy, Inc. First Mortgage Bonds, Series BBB, 8%, Due July 15, 2009" are outstanding, the Company reserves the right to amend the Indenture, without the consent or other action by the holders of the bonds outstanding at that time, to decrease the seventy-five per centum (75%) vote requirement referred to above to sixty-six and two-thirds per centum (66-2/3%).

Prior to December 15, 2035 (the "Par Call Date"), the Company may redeem at its option the Bonds of Series DDDD, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Bonds of Series DDDD matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate applicable to the Bonds of Series DDDD plus 15 basis points less (b) interest accrued to the redemption date; and 100% of the principal amount of the Bonds of Series DDDD to be redeemed, plus, in either case, accrued and unpaid interest thereon to, but excluding, the redemption date. The Company shall notify the Trustee of the redemption price with respect to any redemption pursuant to this paragraph promptly after the calculation thereof. The Trustee shall not be responsible for calculating said redemption price.

On or after the Par Call Date, the Company may redeem at its option the Bonds of Series DDDD, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Bonds of Series DDDD to be redeemed plus accrued and unpaid interest thereon to, but excluding, the redemption date.

"Business day" means any day other than a day on which banks in New York City are required or authorized to be closed.

"Treasury Rate" means, with respect to any redemption date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as "Selected Interest Rates (Daily)—H.15" (or any successor designation or publication) ("H.15") under the caption "U.S. government securities—Treasury constant maturities — Nominal" (or any successor caption or heading) ("H.15 TCM"). In determining the Treasury Rate, the Company shall select, as applicable:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;· the yield for the Treasury constant maturity on H.15 exactly equal to the
period from the redemption date to the Par Call Date (the "Remaining Life"); or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;· if there is no such Treasury constant maturity on H.15 exactly equal to the
Remaining Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one
yield corresponding to the Treasury constant maturity on H.15 immediately longer than such Remaining Life—and shall interpolate
to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal
places; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;· if there is no such Treasury constant maturity on H.15 shorter than or longer
than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to such Remaining Life. For purposes of this
clause, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant
number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third business day preceding the redemption date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company's actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

The Trustee shall have no obligation or duty whatsoever to determine, or to verify the Company's calculations of, the redemption price.

If a Tax Credit Event (as defined below) occurs, the Company may redeem, upon the sending of a notice of redemption to the holders of the Bonds of Series DDDD, the Bonds of Series DDDD in whole but not in part at a redemption price equal to 101% of the principal amount of the Bonds of Series DDDD being redeemed, plus accrued and unpaid interest to but excluding the redemption date. A notice of redemption of the Bonds of Series DDDD upon the occurrence of a Tax Credit Event (i) may only be sent by the later of (a) the end of the calendar year in which the Bonds of Series DDDD were issued and (b) six months from the date of issuance of the Bonds of Series DDDD and (ii) shall be accompanied by a certificate from an officer of the Company stating that a Tax Credit Event has occurred.

The consummation of a redemption upon a Tax Credit Event may be subject to the Trustee's receipt of the required redemption moneys on or before the redemption date (and in such case no such redemption shall occur unless such moneys have been received by the Trustee on or before such date).

A "Tax Credit Event" occurs with respect to the Bonds of Series DDDD if, in the Company's reasonable determination, there exists a material risk, due to the Bonds of Series DDDD (considered together with other debt) having been issued, as part of an original issuance, to one or more "specified foreign entities," as defined in Section 7701(a)(51)(B) of the Internal Revenue Code (the "Code"), that the Company or any of its affiliates would be unable to utilize or otherwise ineligible to claim any tax credits otherwise allowed under Section 38 of the Code.

Notice of any redemption by the Company will be mailed at least 30 days but not more than 60 days before any redemption date to each holder of Bonds of Series DDDD to be redeemed. If less than all the Bonds of Series DDDD are to be redeemed at the option of the Company, and if the Bonds of Series DDDD are not Global Securities, the Bonds of Series DDDD will be redeemed by lot.

Unless the Company defaults in payment of the redemption price, on and after any redemption date, interest will cease to accrue on the Bonds of Series DDDD or portions thereof called for redemption.

In the case of any of certain events of default specified in the Indenture, the principal of this bond may be declared or may become due and payable prior to the stated date of maturity hereof in the manner and with the effect provided in the Indenture.

No recourse shall be had for the payment of the principal of or interest on this bond, or for any claim based hereon, or otherwise in respect hereof or of the Indenture, to or against any incorporator, shareholder, officer or director, past, present or future, of the Company or of any predecessor or successor company, either directly or through the Company or such predecessor or successor company, under any constitution or statute or rule of law, or by the enforcement of any assessment or penalty, or otherwise, all such liability of incorporators, shareholders, directors and officers being waived and released by the registered owner hereof by the acceptance of this bond and being likewise waived and released by the terms of the Indenture.

The Bonds of Series DDDD are issuable only in registered form without coupons. This bond is transferable by the registered owner hereof, in person or by an attorney duly authorized, at the principal office or place of business of Deutsche Bank Trust National Company, the Trustee, or its successor in trust under the Indenture, or, if the Bonds of Series DDDD are not Global Securities, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City of New York, State of New York, upon the surrender and cancellation of this bond, and upon any such transfer a new registered bond or bonds of the same series and maturity date and for the same aggregate principal amount will be issued to the transferee in exchange herefor.

The Bonds of Series DDDD are issuable in denominations of $2,000 and integral multiples of $1,000 in excess thereof as shall from time to time be determined and authorized by the Board of Directors of the Company. In the manner and subject to the limitations provided in the Indenture, Bonds of Series DDDD are exchangeable as between authorized denominations, upon presentation thereof for such purpose by the registered owner, at the principal office or place of business of Deutsche Bank National Trust Company, the Trustee, or its successor in trust under the Indenture, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City of New York, State of New York.

No service charge will be made for any transfer or exchange of this bond, but the Company may require a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

(FORM OF TRUSTEE'S CERTIFICATE)

TRUSTEE'S CERTIFICATE

This bond is one of the Bonds of Series DDDD designated therein referred to and described in the within mentioned Indenture and Seventy-Fourth Supplemental Indenture.

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|:---|:---|
| DEUTSCHE BANK NATIONAL TRUST COMPANY, AS TRUSTEE | DEUTSCHE BANK NATIONAL TRUST COMPANY, AS TRUSTEE |
| By | |
|  | Authorized Officer |

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[THE REMAINDER OF THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY.]

*Section 3.* The Bond of Series DDDD issued prior to the first interest payment date shall be dated as of March 6, 2026, and otherwise shall be dated as provided in Section 1 of Article II of the Indenture.

*Section 4.* All Bonds of Series DDDD shall be due and payable on March 15, 2036, and shall bear interest from the date thereof at the rate of 4.95% per annum, payable semi-annually on the fifteenth day of March and September in each year, commencing on September 15, 2026, to each holder of record at the close of business on the record date for the applicable interest payment date, which will be (i) the close of business on the Business Day immediately preceding such interest payment date so long as all of the Bonds of Series DDDD remain in book-entry only form or (ii) the close of business on the fifteenth calendar day immediately preceding such interest payment date if any of the Bonds of Series DDDD do not remain in book-entry only form, in each case, until the principal amount of the Bonds of Series DDDD has been paid or made available for payment. Interest on the Bonds of Series DDDD shall be computed on the basis of a 360-day year consisting of twelve 30-day months.

*Section 5.* Subject to agreements with or the rules of the Depository or any successor book-entry security system or similar system with respect to Global Securities, both the principal of and the interest on the Bonds of Series DDDD shall be payable in any coin or currency of the United States of America which at the time of payment is legal tender for the payment of public and private debts, at the office or agency of the Company in Plainfield, Indiana, or, at the option of the holder thereof, at the office or agency of the Company in the Borough of Manhattan, The City of New York, State of New York, except that interest on the Bonds of Series DDDD may be paid, at the option of the Company, by check or draft mailed to the address of the person entitled thereto as it appears on the books of the Company maintained for that purpose.

*Section 6.* Definitive Bonds of Series DDDD shall be issuable in denominations of $2,000 and integral multiples of $1,000 in excess thereof, numbered consecutively from "DDDD-R-1" upward.

The Bonds of Series DDDD shall be executed on behalf of the Company by the manual or facsimile signature of its President or an Executive Vice President or one of its Vice Presidents and shall have affixed thereto the seal of the Company or a facsimile thereof attested by the manual or facsimile signature of its Secretary or one of its Assistant Secretaries and shall be authenticated by the execution by the Trustee of the certificate endorsed on said bonds.

No service charge will be made by the Company for the transfer or for the exchange of Bonds of Series DDDD except, in the case of transfer, a charge sufficient to reimburse the Company for any tax or other governmental charge payable in connection therewith.

Pursuant to the provisions of Section 11 of Article II of the Indenture, the Bonds of Series DDDD may be issued in temporary form, and if temporary bonds be issued, the Company shall, with all reasonable dispatch, at its own expense and without charge to the holders of the temporary bonds, prepare and execute definitive Bonds of Series DDDD and exchange the temporary bonds for such definitive bonds in the manner provided for in said section, provided, however, no presentation or surrender of temporary Bonds of Series DDDD shall be necessary in order for the holders entitled to interest thereon to receive such interest.

*Section 7.* Article IX of the Indenture, "Maintenance and Renewal Fund and Sinking Fund Provisions", as heretofore amended or supplemented shall not apply to the "PSI Energy, Inc. First Mortgage Bonds, Series BBB, 8%, Due July 15, 2009" (such bonds being hereinafter referred to as the "Bonds of Series BBB") or to any subsequently created series of bonds (which includes the Bonds of Series DDDD) from and after the date on which no series of bonds created under the Indenture prior to the Bonds of Series BBB are outstanding.

*Section 8.* Section 22 of Article V of the Indenture as heretofore amended or supplemented which, among other things, requires an inspection of the mortgaged property every two years by an independent engineer, shall not apply to the Bonds of Series BBB or to any subsequently created series of bonds (which includes the Bonds of Series DDDD), from and after the date on which no series of bonds created under the Indenture prior to the Bonds of Series BBB are outstanding.

*Section 9.* The Company reserves the right, without consent or other action by the holders of the Bonds of Series BBB or of any subsequently created series of bonds (which includes the Bonds of Series DDDD), to amend the Indenture, as heretofore amended or supplemented, at any time after all bonds of any series created prior to the Bonds of Series BBB are no longer outstanding under the Indenture, as follows:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) by substituting for the words "in principal amount not greater than sixty per centum (60%) of" in Section 3 of Article IV thereof the following:

"in principal amount not greater than sixty-six and two-thirds per centum (66-2/3%) of".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) by substituting for the words "shall exceed sixty per centum (60%) of the value of bondable property so acquired" in Section 9 of Article V thereof the following:

"shall exceed sixty-six and two-thirds per centum (66-2/3%) of the value of bondable property so acquired".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) by substituting for the words "shall be deemed to be paid within the meaning of this article; *provided,* that the date for the payment or redemption of such bonds shall be not more than one (1) year after such moneys shall have been so set apart or paid." in the first paragraph of Article XIV thereof the following:

"shall be deemed to be paid within the meaning of this article.".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) by substituting for the words "with the consent of holders of at least seventy-five per centum (75%) in aggregate principal amount of the bonds at the time outstanding;" in sub-section (a) of Section 3 of Article XVIII thereof the following:

"with the consent of holders of at least sixty-six and two-thirds per centum (66-2/3%) in aggregate principal amount of the bonds at the time outstanding;".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) by substituting for the words "holders (or persons entitled to vote the bonds) of not less than seventy-five per centum (75%) in aggregate principal amount of the bonds entitled to be voted" in subsection (l) of Section 3 of Article XVIII thereof the following:

"holders (or persons entitled to vote the bonds) of not less than sixty-six and two-thirds per centum (66-2/3%) in aggregate principal amount of the bonds entitled to be voted".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) by substituting for the words "holders (or persons entitled to vote the bonds) of at least seventy-five per centum (75%) in principal amount of the bonds outstanding" in sub-section (m) of Section 3 of Article XVIII thereof the following:

"holders (or persons entitled to vote the bonds) of at least sixty-six and two-thirds per centum (66-2/3%) in principal amount of the bonds outstanding".

*Section 10.* The Bonds shall not be entitled to the benefit of a sinking fund.

ARTICLE II.

ISSUANCE OF BONDS OF Series DDDD.

*Section 1.* An initial issue of the Bonds of Series DDDD, in the aggregate principal amount not exceeding five hundred million dollars ($500,000,000) may be executed by the Company and delivered to the Trustee for authentication, and shall be authenticated and delivered by the Trustee to or upon the order of the Company (which authentication and delivery may be made without awaiting the filing or recording of this Seventy-Fourth Supplemental Indenture), upon receipt by the Trustee of the resolutions, certificates, orders, opinions and other instruments required by the provisions of Section 3 of Article IV of the Indenture to be received by the Trustee as a condition to the authentication and delivery by the Trustee of bonds pursuant to said Section 3.

*Section 2.* Subject to the limitations provided in Section 24 of Article V of the Indenture, additional Bonds of Series DDDD may be issued by the Company under the provisions of Sections 2, 3 or 4 of Article IV of the Indenture.

ARTICLE III.

INDENTURE AMENDMENTS.

*Section 1.* Article I of the Indenture, as heretofore amended, is hereby further amended (i) by adding immediately after subdivision "(109)" thereof an additional subdivision numbered "(110)" and reading as follows:

and (ii) by changing the numbering of the present subdivision "(110)" thereof to "(111)".

*Section 2.* Article VII of the Indenture, as heretofore amended, is hereby further amended by inserting therein immediately after Section 55 thereof, a new section designated "Section 56" and reading as follows:

"Section 56. Prior to December 15, 2035 (the "Par Call Date"), the Company may redeem at its option the Bonds of Series DDDD, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Bonds of Series DDDD matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate applicable to the Bonds of Series DDDD plus 15 basis points less (b) interest accrued to the redemption date; and 100% of the principal amount of the Bonds of Series DDDD to be redeemed, plus, in either case, accrued and unpaid interest thereon to, but excluding, the redemption date. The Company shall notify the Trustee of the redemption price with respect to any redemption pursuant to this paragraph promptly after the calculation thereof. The Trustee shall not be responsible for calculating said redemption price.

On or after the Par Call Date, the Company may redeem at its option the Bonds of Series DDDD, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Bonds of Series DDDD to be redeemed plus accrued and unpaid interest thereon to, but excluding, the redemption date.

"Business day" means any day other than a day on which banks in New York City are required or authorized to be closed.

"Treasury Rate" means, with respect to any redemption date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as "Selected Interest Rates (Daily)—H.15" (or any successor designation or publication) ("H.15") under the caption "U.S. government securities—Treasury constant maturities — Nominal" (or any successor caption or heading) ("H.15 TCM"). In determining the Treasury Rate, the Company shall select, as applicable:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;· the yield for the Treasury constant maturity on H.15 exactly equal to the
period from the redemption date to the Par Call Date (the "Remaining Life"); or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;· if there is no such Treasury constant maturity on H.15 exactly equal to the
Remaining Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one
yield corresponding to the Treasury constant maturity on H.15 immediately longer than such Remaining Life—and shall interpolate
to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal
places; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;· if there is no such Treasury constant maturity on H.15 shorter than or longer
than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to such Remaining Life. For purposes of this
clause, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant
number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third business day preceding the redemption date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company's actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

The Trustee shall have no obligation or duty whatsoever to determine, or to verify the Company's calculations of, the redemption price.

Notice of any redemption by the Company will be mailed at least 30 days but not more than 60 days before any redemption date to each holder of Bonds of Series DDDD to be redeemed. If less than all the Bonds of Series DDDD are to be redeemed at the option of the Company, and if the Bonds of Series DDDD are not Global Securities, the Bonds of Series DDDD will be redeemed by lot.

Unless the Company defaults in payment of the redemption price, on and after any redemption date, interest will cease to accrue on the Bonds of Series DDDD or portions thereof called for redemption.

The Company shall indemnify and hold harmless the Trustee from any and all losses, costs, damages, expenses, fees (including attorneys' fees), court costs, judgments, penalties, obligations, suits, disbursements and liabilities of any kind or character whatsoever which may at any time be imposed upon, incurred by or asserted against the Trustee by reason of or arising out of or caused, directly or indirectly by any act or omission of the Trustee with respect to this Section 55, except for such that would arise out of the willful misconduct or gross negligence of the Trustee and except for costs and expenses arising in the ordinary course of the Trustee's business."

In Article VII of the Indenture, as heretofore amended, is hereby further amended by inserting therein immediately after Section 56 thereof, a new section designated "Section 57" and reading as follows:

If a Tax Credit Event (as defined below) occurs, the Company may redeem, upon the sending of a notice of redemption to the holders of the Bonds of Series DDDD, the Bonds of Series DDDD in whole but not in part at a redemption price equal to 101% of the principal amount of the Bonds of Series DDDD being redeemed, plus accrued and unpaid interest to but excluding the redemption date. A notice of redemption of the Bonds of Series DDDD upon the occurrence of a Tax Credit Event (i) may only be sent by the later of (a) the end of the calendar year in which the Bonds of Series DDDD were issued and (b) six months from the date of issuance of the Bonds of Series DDDD and (ii) shall be accompanied by a certificate from an officer of the Company stating that a Tax Credit Event has occurred.

The consummation of a redemption upon a Tax Credit Event may be subject to the Trustee's receipt of the required redemption moneys on or before the redemption date (and in such case no such redemption shall occur unless such moneys have been received by the Trustee on or before such date).

A "Tax Credit Event" occurs with respect to the Bonds of Series DDDD if, in the Company's reasonable determination, there exists a material risk, due to the Bonds of Series DDDD (considered together with other debt) having been issued, as part of an original issuance, to one or more "specified foreign entities," as defined in Section 7701(a)(51)(B) of the Internal Revenue Code (the "Code"), that the Company or any of its affiliates would be unable to utilize or otherwise ineligible to claim any tax credits otherwise allowed under Section 38 of the Code.

ARTICLE IV.

CONCERNING THE TRUSTEE.

The Trustee hereby accepts the trusts hereby declared and agrees to perform the same upon the terms and conditions in the Indenture and in this Seventy-Fourth Supplemental Indenture set forth. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Seventy-Fourth 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 solely. In general, each and every term and condition contained in Article XVII of the Indenture shall apply to this Seventy-Fourth Supplemental Indenture.

ARTICLE V.

MISCELLANEOUS PROVISIONS.

*Section 1.* Wherever in the original Indenture or in any of the seventy-four supplemental indentures thereto reference is made to any article or section of the original Indenture, such reference shall be deemed to refer to such article or section as amended by such supplemental indentures.

*Section 2.* Upon the execution and delivery hereof, the Indenture shall thereupon be deemed to be amended as hereinabove set forth as fully and with the same effect as if the amendments made hereby were set forth in the original Indenture and each of the seventy-four supplemental indentures to the Indenture shall henceforth be read, taken and construed as one and the same instrument; but such amendments shall not operate so as to render invalid or improper any action heretofore taken under the original Indenture or said supplemental indentures.

*Section 3.* All the covenants, stipulations and agreements in this Seventy-Fourth Supplemental Indenture contained are and shall be for the sole and exclusive benefit of the parties hereto, their successors and assigns, and of the holders from time to time of the bonds.

*Section 4.* The table of contents to, and the headings of the different articles of, this Seventy-Fourth Supplemental Indenture are inserted for convenience of reference, and are not to be taken to be any part of the provisions hereof, nor to control or affect the meaning, construction or effect of the same.

*Section 5.* This Seventy-Fourth Supplemental Indenture may be simultaneously executed in any number of counterparts, and all such counterparts shall constitute but one and the same instrument. The words "execution," signed," signature," and words of like import in this Seventy-Fourth Supplemental Indenture shall include images of manually executed signatures transmitted by facsimile, email or other electronic format (including, without limitation, "pdf," "tif" or "jpg") and other electronic signatures (including without limitation, DocuSign and AdobeSign). The use of electronic signatures and electronic records (including, without limitation, any contract or other record created, generated, sent, communicated, received, or stored by electronic means) shall be of the same legal effect, validity and enforceability as a manually executed signature or use of a paper-based record-keeping system to the fullest extent permitted by applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act and any other applicable law, including, without limitation, any state law based on the Uniform Electronic Transactions Act or the Uniform Commercial Code. Without limitation to the foregoing, and anything in the Indenture to the contrary notwithstanding, (a) any officer's certificate, order of the company or request of the company, opinion of counsel, bonds, Global Securities or Securities, certificate of authentication appearing on or attached to any Global Security or any Securities or other certificate, instrument, agreement or other document delivered pursuant to the Indenture may be executed, attested and transmitted by any of the foregoing electronic means and formats, (b) all references in this Section 5 or elsewhere in this Seventy-Fourth Supplemental Indenture to the execution, attestation or authentication of any Securities or any certificate of authentication appearing on or attached to any bond, Global Security or any Securities by means of a manual or facsimile signature shall be deemed to include signatures that are made or transmitted by any of the foregoing electronic means or formats, and (c) any requirement in this Section 5 or elsewhere in this Seventy-Fourth Supplemental Indenture that any signature be made under a corporate seal (or facsimile thereof) shall not be applicable to the Global Security or Securities.

*Section 6.* Whenever a payment of principal or interest in respect of the Bonds of Series DDDD are due on any day other than a Business Day (as hereinafter defined), such payment shall be payable on the first Business Day next following such date, and, in the case of a principal payment, interest on such principal payment shall accrue to the date of such principal payment. For the purposes of this Section 6 the term Business Day shall mean any day other than a day on which the Trustee is authorized by law to close.

[THE REMAINDER OF THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY.]

IN WITNESS WHEREOF, said Duke Energy Indiana, LLC has caused this instrument to be executed in its limited liability company name by its President or one of its Vice Presidents and to be attested by its Secretary or one of its Assistant Secretaries and said Deutsche Bank National Trust Company has caused this instrument to be executed in its corporate name by, and to be attested by, its authorized officers, in several counterparts, all as of the day and year first above written.

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| | | |
|:---|:---|:---|
|  | DUKE ENERGY INDIANA, LLC | DUKE ENERGY INDIANA, LLC |
| (COMPANY SEAL) | By | /s/ Nicholas J. Giaimo |
|  |  | Nicholas J. Giaimo |
|  |  | Senior Vice President, Treasurer, and Chief Risk Officer |

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ATTEST:

---

| |
|:---|
| /s/ Elizabeth H. Jones |
| Elizabeth H. Jones |
| Assistant Secretary |

---

---

| | | |
|:---|:---|:---|
|  | DEUTSCHE BANK NATIONAL TRUST COMPANY, as Trustee and not in its individual capacity | DEUTSCHE BANK NATIONAL TRUST COMPANY, as Trustee and not in its individual capacity |
| (CORPORATE SEAL) | By | /s/ Peter Bono |
|  |  | Name: Peter Bono |
|  |  | Title: Assistant Vice President |
|  | By | /s/ Mary Miselis |
|  |  | Name: Mary Miselis |
|  |  | Title: Vice President |

---

ATTEST:

---

| |
|:---|
| /s/ Arian Kalaba |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Name: Arian Kalaba |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Title: Associate |

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[TRUSTEE'S SIGNATURE PAGE TO SEVENTY-FOURTH SUPPLEMENTAL INDENTURE]

STATE OF NORTH CAROLINA) ) ss: <br> COUNTY OF LINCOLN)

BE IT REMEMBERED, that on this 26th day of February, 2026, before me, the undersigned, a notary public in and for the County and State aforesaid, duly commissioned and qualified, personally appeared Nicholas J. Giaimo and Elizabeth H. Jones, personally known to me to be the same persons whose names are subscribed to the foregoing instrument, and personally known to me to be the Senior Vice President, Treasurer, and Chief Risk Officer and an Assistant Secretary, respectively, of Duke Energy Indiana, LLC, an Indiana limited liability company, and acknowledged that they signed and delivered said instrument as their free and voluntary act as such Senior Vice President, Treasurer, and Chief Risk Officer and Assistant Secretary, respectively, and as the free and voluntary act of said Duke Energy Indiana, LLC, for the uses and purposes therein set forth; in pursuance of the power and authority granted to them by resolution of the Board of Directors of said Company.

IN WITNESS WHEREOF, I have hereunto set my hand and affixed my notarial seal the day and year aforesaid.

(NOTARIAL SEAL)

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| |
|:---|
| /s/ Sheila Lemoine |
| Sheila Lemoine, Notary Public |
| Notary Public, North Carolina<br> Lincoln County<br> Commission expires: July 21, 2029 |

---

STATE OF NEW YORK) ) ss: <br> COUNTY OF NEW YORK)

BE IT REMEMBERED, that on this 4th day of March, 2026, before me, the undersigned, a notary public in and for the County and State aforesaid, duly commissioned and qualified, personally appeared Peter Bono and Mary Miselis personally known to me to be the same persons whose names are subscribed to the foregoing instrument, and personally known to me to be a/an Assistant Vice President and a/an Vice President, respectively, of Deutsche Bank National Trust Company, a national banking association, and acknowledged that they signed and delivered said instrument as their free and voluntary act as such Assistant Vice President and Vice President, respectively, and as the free and voluntary act of said Deutsche Bank National Trust Company, for the uses and purposes therein set forth; in pursuance of the power and authority granted to them by the bylaws of said association.

IN WITNESS WHEREOF, I have hereunto set my hand and affixed my notarial seal the day and year aforesaid.

(NOTARIAL SEAL)

---

| |
|:---|
| /s/ Annie Jaghatspanyan |
| *Notary Public*<br> *ANNIE JAGHATSPANYAN*<br> NOTARY PUBLIC, STATE OF NEW YORK<br> Registration No. 01JA6397385<br> Qualified in New York County<br> My Commission Expires 9/3/2027 |

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This instrument was prepared by:

Brendan P. Harney, Esq.\*

Hunton Andrews Kurth LLP

200 Park Avenue

New York, New York 10166

\*Admitted in New York; not admitted in Indiana

## Exhibit 5.1

**Exhibit 5.1**

**DUKE ENERGY BUSINESS SERVICES, LLC**

525 South Tryon Street

Charlotte, North Carolina 28202

March 6, 2026

Duke Energy Indiana, LLC

1000 East Main Street

Plainfield, Indiana 46168

Re: Duke Energy Indiana, LLC $500,000,000 aggregate principal amount of First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036

Ladies and Gentlemen:

I am Deputy General Counsel of Duke Energy Business Services LLC, the service company affiliate of Duke Energy Indiana, LLC, an Indiana limited liability company (the "Company"), and in such capacity I have acted as counsel to the Company in connection with the public offering of $500,000,000 aggregate principal amount of the Company's First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036 (the "Securities"), to be issued pursuant to an Indenture of Mortgage or Deed of Trust, dated September 1, 1939 (the "Original Indenture"), between the Company and Deutsche Bank National Trust Company, as Trustee (the "Trustee"), as amended and supplemented from time to time, including by the Seventy-Fourth Supplemental Indenture, dated as of March 6, 2026, relating to the Securities (the "Supplemental Indenture") (collectively, the "Indenture"). On March 4, 2026, the Company entered into an Underwriting Agreement (the "Underwriting Agreement") with BMO Capital Markets Corp., CIBC World Markets Corp., MUFG Securities Americas Inc. and U.S. Bancorp Investments, Inc., as representatives of the several underwriters named therein (the "Underwriters"), relating to the sale by the Company to the Underwriters of the Securities.

This opinion is being delivered in accordance with the requirements of Item 601(b)(5) of Regulation S-K under the Securities Act of 1933, as amended (the "Securities Act").

My opinion set forth herein is limited to the laws of the State of Indiana. I do not express any opinion with respect to the laws of any other jurisdiction, or as to the effect thereof on the opinion herein stated. The Indenture and the form of Securities do not include provisions specifying the governing law. For purposes of my opinions, I have assumed that the Indenture and the Securities are governed exclusively by the internal substantive laws and judicial interpretations of the State of Indiana. In rendering the opinion set forth herein, with respect to matters of Indiana law, I have relied on the opinion of Andrew Wells, Esq., Deputy General Counsel of Duke Energy Business Services LLC, the service company affiliate of the Company, attached hereto as Annex I.

In connection with this opinion, I or attorneys under my supervision (with whom I have consulted) have examined and are familiar with originals or copies, certified or otherwise identified to our satisfaction, of:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) the registration statement on Form S-3 (File No. 333-290475-03) of the Company filed on September 24, 2025, with the Securities and Exchange Commission (the "Commission") under the Securities Act, allowing for delayed offerings pursuant to Rule 415 under the Securities Act and the information deemed to be a part of such registration statement as of the date hereof pursuant to Rule 430B of the General Rules and Regulations under the Securities Act (the "Rules and Regulations") (such registration statement, effective upon filing with the Commission on September 24, 2025 pursuant to Rule 462(e) of the Rules and Regulations, being hereinafter referred to as the "Registration Statement");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) the prospectus, dated September 23, 2025, which forms a part of and is included in the Registration Statement in the form filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) the preliminary prospectus supplement, dated March 4, 2026, relating to the offering of the Securities in the form filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) the prospectus supplement, dated March 4, 2026, relating to the offering of the Securities in the form filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) the Issuer Free Writing Prospectus filed with the Commission on March 4, 2026 pursuant to Rule 433(d) of the Securities Act and Section 5(e) of the Underwriting Agreement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) the Articles of Organization of the Company, effective January 1, 2016, as amended;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) the Amended and Restated Limited Liability Company Operating Agreement of the Company, dated as of August 25, 2021, as amended;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) an executed copy of the Underwriting Agreement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) a specimen of the Securities;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j) an executed copy of the Indenture;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k) an executed copy of the Supplemental Indenture;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l) resolutions adopted by the Board of Directors of the Company, effective September 19, 2025, relating to the preparation and filing with the Commission of the Registration Statement and the issuance of the Company's securities; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(m) the written consent of Assistant Treasurer, Jordan Morgan, effective March 4, 2026, relating to the offering of the Securities.

I or attorneys under my supervision (with whom I have consulted) have also examined originals or copies, certified or otherwise identified to our satisfaction, of such records of the Company and such agreements and certificates and receipts of public officials, certificates of officers or other representatives of the Company and others, and such other documents, certificates and records as I or attorneys under my supervision (with whom I have consulted) have deemed necessary or appropriate as a basis for the opinions set forth below.

In my examination, I or attorneys under my supervision (with whom I have consulted) have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of all documents submitted to me as originals, the conformity to original documents of all documents submitted to me as facsimile, electronic, certified or photostatic copies, and the authenticity of such copies. In making my examination of executed documents, I have assumed that the parties thereto, other than the Company, had the power, limited liability company or other, to enter into and perform all obligations thereunder and I have also assumed the due authorization by all requisite action, limited liability company or other, and the execution and delivery by such parties of such documents and, except to the extent expressly set forth below, the validity and binding effect thereof on such parties. As to any facts material to the opinions expressed herein which were not independently established or verified, I or attorneys under my supervision (with whom I have consulted) have relied upon oral or written statements and representations of officers and other representatives of the Company and others.

The opinion set forth below is subject to the following further qualifications, assumptions and limitations:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) the validity or enforcement of any agreements or instruments may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or other similar laws affecting mortgagees' and other creditors' rights generally and by general principles of equity (regardless of whether enforceability is considered in a proceeding in equity or at law) and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) I do not express any opinion as to the applicability or effect of any fraudulent transfer, preference or similar law on any agreements or instruments or any transactions contemplated thereby.

Based upon the foregoing and subject to the limitations, qualifications, exceptions and assumptions set forth herein, I am of the opinion that the Securities have been duly authorized and executed by the Company, and that when duly authenticated by the Trustee and issued and delivered by the Company against payment therefor in accordance with the terms of the Underwriting Agreement and the Indenture, the Securities will constitute valid and binding obligations of the Company entitled to the benefits of the Indenture and enforceable against the Company in accordance with their terms.

I hereby consent to the filing of this opinion with the Commission as an exhibit to the Registration Statement through incorporation by reference of a current report on Form 8-K. I also consent to the reference to my name under the heading "Legal Matters" in the Prospectus Supplement. In giving this consent, I do not thereby admit that I am in the category of persons whose consent is required under Section 7 of the Securities Act or the Rules and Regulations of the Commission promulgated thereunder. This opinion is expressed as of the date hereof unless otherwise expressly stated, and I disclaim any undertaking to advise you of any subsequent changes in the facts stated or assumed herein or of any subsequent changes in applicable laws.

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| |
|:---|
| Very truly yours, |
| /s/ Elizabeth H. Jones |
| Elizabeth H. Jones, Esq. |

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Annex I

**DUKE ENERGY BUSINESS SERVICES, LLC**

525 South Tryon Street

Charlotte, North Carolina 28202

March 6, 2026

Elizabeth H. Jones, Esq.

525 South Tryon Street

Charlotte, North Carolina 28202

Re: Duke Energy Indiana, LLC $500,000,000 aggregate principal amount of First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036

Dear Ms. Jones:

I am Deputy General Counsel of Duke Energy Business Services LLC, the service company affiliate of Duke Energy Indiana, LLC, an Indiana limited liability company (the "Company"), and in such capacity I have acted as counsel to the Company in connection with the public offering of $500,000,000 aggregate principal amount of the Company's First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036 (the "Securities"), to be issued pursuant to an Indenture of Mortgage or Deed of Trust, dated September 1, 1939 (the "Original Indenture"), between the Company and Deutsche Bank National Trust Company, as Trustee (the "Trustee"), as amended and supplemented from time to time, including by the Seventy-Fourth Supplemental Indenture, dated as of March 6, 2026, relating to the Securities (the "Supplemental Indenture") (collectively, the "Indenture"). On March 4, 2026, the Company entered into an Underwriting Agreement (the "Underwriting Agreement") with BMO Capital Markets Corp., CIBC World Markets Corp., MUFG Securities Americas Inc. and U.S. Bancorp Investments, Inc., as representatives of the several underwriters named therein (the "Underwriters"), relating to the sale by the Company to the Underwriters of the Securities.

This opinion is being delivered in accordance with the requirements of Item 601(b)(5) of Regulation S-K under the Securities Act of 1933, as amended (the "Securities Act").

I am a member of the bar of the State of Indiana and my opinion set forth herein is limited to the laws of the State of Indiana. I do not express any opinion with respect to the laws of any other jurisdiction, or as to the effect thereof on the opinion herein stated. The Indenture and the form of Securities do not include provisions specifying the governing law. For purposes of my opinions, I have assumed that the Indenture and the Securities are governed exclusively by the internal substantive laws and judicial interpretations of the State of Indiana.

In connection with this opinion, I or attorneys under my supervision (with whom I have consulted) have examined and are familiar with originals or copies, certified or otherwise identified to our satisfaction, of:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) the registration statement on Form S-3 (File No. 333-290475-03) of the Company filed on September 24, 2025, with the Securities and Exchange Commission (the "Commission") under the Securities Act, allowing for delayed offerings pursuant to Rule 415 under the Securities Act and the information deemed to be a part of such registration statement as of the date hereof pursuant to Rule 430B of the General Rules and Regulations under the Securities Act (the "Rules and Regulations") (such registration statement, effective upon filing with the Commission on September 24, 2025 pursuant to Rule 462(e) of the Rules and Regulations, being hereinafter referred to as the "Registration Statement");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) the prospectus, dated September 23, 2025, which forms a part of and is included in the Registration Statement in the form filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) the preliminary prospectus supplement, dated March 4, 2026, relating to the offering of the Securities in the form filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) the prospectus supplement, dated March 4, 2026, relating to the offering of the Securities in the form filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) the Issuer Free Writing Prospectus filed with the Commission on March 4, 2026 pursuant to Rule 433(d) of the Securities Act and Section 5(e) of the Underwriting Agreement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) the Articles of Organization of the Company, effective January 1, 2016, as amended;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) the Amended and Restated Limited Liability Company Operating Agreement of the Company, dated as of August 25, 2021, as amended;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) an executed copy of the Underwriting Agreement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) a specimen of the Securities;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j) an executed copy of the Indenture;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k) an executed copy of the Supplemental Indenture;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l) resolutions adopted by the Board of Directors of the Company, effective September 19, 2025, relating to the preparation and filing with the Commission of the Registration Statement and the issuance of the Company's securities; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(m) the written consent of Assistant Treasurer, Jordan Morgan, effective March 4, 2026, relating to the offering of the Securities.

I or attorneys under my supervision (with whom I have consulted) have also examined originals or copies, certified or otherwise identified to our satisfaction, of such records of the Company and such agreements and certificates and receipts of public officials, certificates of officers or other representatives of the Company and others, and such other documents, certificates and records as I or attorneys under my supervision (with whom I have consulted) have deemed necessary or appropriate as a basis for the opinions set forth below.

In my examination, I or attorneys under my supervision (with whom I have consulted) have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of all documents submitted to me as originals, the conformity to original documents of all documents submitted to me as facsimile, electronic, certified or photostatic copies, and the authenticity of such copies. In making my examination of executed documents, I have assumed that the parties thereto, other than the Company, had the power, limited liability company or other, to enter into and perform all obligations thereunder and I have also assumed the due authorization by all requisite action, limited liability company or other, and the execution and delivery by such parties of such documents and, except to the extent expressly set forth below, the validity and binding effect thereof on such parties. As to any facts material to the opinions expressed herein which were not independently established or verified, I or attorneys under my supervision (with whom I have consulted) have relied upon oral or written statements and representations of officers and other representatives of the Company and others.

The opinion set forth below is subject to the following further qualifications, assumptions and limitations:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) the validity or enforcement of any agreements or instruments may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or other similar laws affecting mortgagees' and other creditors' rights generally and by general principles of equity (regardless of whether enforceability is considered in a proceeding in equity or at law) and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) I do not express any opinion as to the applicability or effect of any fraudulent transfer, preference or similar law on any agreements or instruments or any transactions contemplated thereby.

Based upon the foregoing and subject to the limitations, qualifications, exceptions and assumptions set forth herein, I am of the opinion that the Securities have been duly authorized and executed by the Company, and that when duly authenticated by the Trustee and issued and delivered by the Company against payment therefor in accordance with the terms of the Underwriting Agreement and the Indenture, the Securities will constitute valid and binding obligations of the Company entitled to the benefits of the Indenture and enforceable against the Company in accordance with their terms.

This opinion is furnished for your benefit in connection with your rendering an opinion to the Company to be filed as an exhibit to the Registration Statement through incorporation by reference of a current report on Form 8-K, and I hereby consent to your attaching this opinion as an annex to such opinion. In giving this consent, I do not thereby admit that I am in the category of persons whose consent is required under Section 7 of the Securities Act or the Rules and Regulations of the Commission promulgated thereunder. This opinion is expressed as of the date hereof unless otherwise expressly stated, and I disclaim any undertaking to advise you of any subsequent changes in the facts stated or assumed herein or of any subsequent changes in applicable laws.

---

| |
|:---|
| Very truly yours, |
| /s/ Andrew Wells |
| Andrew Wells, Esq. |

---

## Exhibit 99.1

**Exhibit 99.1**

***Execution Version***

**DUKE ENERGY indiana, LLC<br> $500,000,000 FIRST MORTGAGE BONDS, SERIES DDDD, 4.95%, DUE MARCH 15, 2036**

***UNDERWRITING AGREEMENT***

March 4, 2026

BMO Capital Markets Corp.<br> 151 West 42nd Street

New York, New York 10036

CIBC World Markets Corp.

300 Madison Avenue, 8th Floor

New York, New York 10017

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

U.S. Bancorp Investments, Inc.

214 N. Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the several Underwriters

c/o BMO Capital Markets Corp.<br> 151 West 42nd Street<br> New York, New York 10036

Ladies and Gentlemen:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. *Introductory*. DUKE ENERGY Indiana, LLC, an Indiana limited liability company (the "**Company**"), proposes, subject to the terms and conditions stated herein, to issue and sell $500,000,000 aggregate principal amount of the Company's First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036 (the "**Bonds**"). The Bonds will be issued under and secured by an Indenture of Mortgage or Deed of Trust, dated September 1, 1939 (the "**Original Mortgage**"), between the Company and Deutsche Bank National Trust Company, as successor trustee (the "**Trustee**"), as supplemented and amended from time to time, including by the Seventy-Fourth Supplemental Indenture, to be dated as of March 6, 2026 (the "**Supplemental Indenture**" and together with the Original Mortgage (as supplemented and amended) the "**First Mortgage Indenture**"). BMO Capital Markets Corp., CIBC World Markets Corp., MUFG Securities Americas Inc. and U.S. Bancorp Investments, Inc. (the "**Representatives**") are acting as representatives of the several underwriters named in Schedule A hereto (together with the Representatives, the "**Underwriters**"). The Company understands that the several Underwriters propose to offer the Bonds for sale upon the terms and conditions contemplated by (i) this Agreement and (ii) the Base Prospectus, the Preliminary Prospectus and the Permitted Free Writing Prospectus (each as defined below) issued at or prior to the Applicable Time (as defined below) (the documents referred to in the foregoing subclause (ii) are referred to herein as the "**Pricing Disclosure Package**").

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. *Representations and Warranties of the Company.* As of the date hereof, as of the Applicable Time (as defined below) and as of the Closing Date (as defined below), the Company represents and warrants to, and agrees with, the several Underwriters that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) A registration statement (No. 333-290475-03), including a prospectus, relating to the Bonds and certain
other securities has been filed with the Securities and Exchange Commission (the "**Commission**") under the Securities
Act of 1933, as amended (the "**1933 Act** "). Such registration statement and any post-effective amendment thereto, each
in the form heretofore delivered to you, became effective upon filing with the Commission pursuant to Rule 462 of the rules and
regulations of the Commission under the 1933 Act (the "**1933 Act Regulations** "), and no stop order suspending the effectiveness
of such registration statement has been issued and no proceeding for that purpose or pursuant to Section 8A of the 1933 Act has been
initiated or threatened by the Commission (if prepared, any preliminary prospectus supplement specifically relating to the Bonds immediately
prior to the Applicable Time included in such registration statement or filed with the Commission pursuant to Rule 424(b) of
the 1933 Act Regulations being hereinafter called a "**Preliminary Prospectus** "); the term "**Registration Statement** "
means the registration statement as deemed revised pursuant to Rule 430B(f)(1) of the 1933 Act Regulations on the date of such
registration statement's effectiveness for purposes of Section 11 of the 1933 Act, as such section applies to the Company and
the Underwriters for the Bonds pursuant to Rule 430B(f)(2) of the 1933 Act Regulations (the "**Effective Date** "),
including all exhibits thereto and including the documents incorporated by reference in the prospectus contained in the Registration Statement
at the time such part of the Registration Statement became effective; the term "**Base Prospectus**" means the prospectus
filed with the Commission on the date hereof by the Company; and the term "**Prospectus**" means the Base Prospectus together
with the prospectus supplement specifically relating to the Bonds prepared in accordance with the provisions of Rule 430B and promptly
filed after execution and delivery of this Agreement pursuant to Rule 430B or Rule 424(b) of the 1933 Act Regulations;
any information included in such Prospectus that was omitted from the Registration Statement at the time it became effective but that
is deemed to be a part of and included in such registration statement pursuant to Rule 430B is referred to as "**Rule 430B Information**;" and any reference herein to the Registration Statement, any Preliminary Prospectus or the Prospectus shall be
deemed to refer to and include the documents incorporated by reference therein, prior to the date hereof; any reference to any amendment
or supplement to any Preliminary Prospectus or Prospectus shall be deemed to refer to and include any documents filed after the date of
such Preliminary Prospectus or Prospectus, as the case may be, under the Securities Exchange Act of 1934, as amended (the "**1934 Act** "), and incorporated by reference in such Preliminary Prospectus or Prospectus, as the case may be; and any reference to
any amendment to the Registration Statement shall be deemed to refer to and include any annual report of the Company filed pursuant to
Section 13(a) or 15(d) of the 1934 Act after the effective date of the Registration Statement that is incorporated by reference
in the Registration Statement. For purposes of this Agreement, the term "**Applicable Time**" means 4:20 p.m. (New
York City time) on the date hereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) The Registration Statement, the Permitted Free Writing Prospectus specified on Schedule B hereto, the
Preliminary Prospectus and the Prospectus conform, and any amendments or supplements thereto will conform, in all material respects to
the requirements of the 1933 Act and the 1933 Act Regulations; and (i) the Registration Statement, as of its original effective date,
as of the date of any amendment, at each deemed effective date with respect to the Underwriters pursuant to Rule 430B(f)(2) of
the 1933 Act Regulations, and at the Closing Date, did not and will not contain any untrue statement of a material fact or omit to state
any material fact required to be stated therein or necessary to make the statements therein not misleading, and (ii) (A) the
Pricing Disclosure Package, as of the Applicable Time, did not, (B) the Prospectus and any amendment or supplement thereto, as of
their dates, will not, and (C) the Prospectus as of the Closing Date will not, include any untrue statement of a material fact or
omit to state any material fact necessary to make the statements therein, in the light of the circumstances under which they were made,
not misleading, except that the Company makes no warranty or representation to the Underwriters with respect to any statements or omissions
made in reliance upon and in conformity with written information furnished to the Company by the Representatives on behalf of the Underwriters
specifically for use in the Registration Statement, the Permitted Free Writing Prospectus, any Preliminary Prospectus or the Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Any Permitted Free Writing Prospectus specified on Schedule B hereto as of its issue date and at all subsequent
times through the completion of the public offer and sale of the Bonds or until any earlier date that the Company notified or notifies
the Underwriters pursuant to Section 5(f) hereof did not, does not and will not include any information that conflicts with
the information (not superseded or modified as of the Effective Date) contained in the Registration Statement, any Preliminary Prospectus
or the Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) At the earliest time the Company or another offering participant made a bona fide offer (within the meaning
of Rule 164(h)(2) of the 1933 Act Regulations) of the Bonds, the Company was not an "ineligible issuer" as defined
in Rule 405 of the 1933 Act Regulations. The Company is, and was at the time of the initial filing of the Registration Statement,
eligible to use Form S-3 under the 1933 Act.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) The documents and interactive data in eXtensible Business Reporting Language ()"**XBRL** ")
incorporated or deemed to be incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus,
at the time they were filed or hereafter are filed with the Commission, complied and will comply in all material respects with the requirements
of the 1934 Act and the rules and regulations of the Commission thereunder (the "**1934 Act Regulations** "), and,
when read together with the other information in the Prospectus, (i) at the time the Registration Statement became effective, (ii) at
the Applicable Time and (iii) on the Closing Date did not, and will not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under
which they were made, not misleading.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) The Company's most recent Annual Report filed on Form 10-K meets the conditions specified in
General Instruction I(1)(a) and (b) of the General Instructions for Form 10-K.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) The compliance by the Company with all of the provisions of this Agreement has been duly authorized by
all necessary limited liability company action and the consummation of the transactions herein contemplated will not conflict with or
result in a breach or violation of any of the terms or provisions of, or constitute a default under, any indenture, mortgage, deed of
trust, loan agreement or other agreement or instrument to which the Company or its subsidiaries are a party or by which either is bound
or to which any of their respective properties or assets are subject that would have a material adverse effect on the business, financial
condition or results of operations of the Company and its subsidiaries, taken as a whole; nor will such compliance result in any violation
of the provisions of the Company's Articles of Organization ()"**Articles**") or the Company's Amended and Restated
Limited Liability Company Operating Agreement ()"**Operating Agreement**") or any statute or any order, rule or regulation
of any court or governmental agency or body having jurisdiction over the Company or its subsidiaries or any of their respective properties
that would have a material adverse effect on the business, financial condition or results of operations of the Company and its subsidiaries,
taken as a whole. No consent, approval, authorization, order, registration or qualification of or with any such court or governmental
agency or body is required for the consummation by the Company of the transactions contemplated by this Agreement, except for authorization
by the Indiana Utility Regulatory Commission ()"**IURC** "), registration of the offer and sale of the Bonds under the 1933
Act, qualification of the First Mortgage Indenture under the Trust Indenture Act of 1939, as amended (the "**1939 Act** ")
and such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or Blue Sky laws
in connection with the purchase and distribution of the Bonds by the Underwriters.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) This Agreement has been duly authorized, executed and delivered by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The Original Mortgage has been duly authorized, executed and delivered by the Company and duly qualified
under the 1939 Act. The Supplemental Indenture has been duly authorized by the Company and, when executed and delivered by the Company
(assuming the due authorization, execution and delivery thereof by the Trustee), the First Mortgage Indenture will constitute a valid
and legally binding instrument of the Company, enforceable against the Company in accordance with its terms, except as (i) the enforceability
thereof may be limited by bankruptcy, insolvency, or similar laws affecting mortgagee's and other creditors' rights generally,
and (ii) the rights of acceleration and the availability of equitable remedies may be limited by equitable principles of general
applicability.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j) The Bonds have been duly authorized by the Company and when executed by the Company, authenticated by
the Trustee (in the manner provided in the First Mortgage Indenture) and delivered against payment therefor will constitute valid and
legally binding obligations of the Company, enforceable against the Company in accordance with their terms, except as (i) the enforceability
thereof may be limited by bankruptcy, insolvency, or similar laws affecting mortgagee's and other creditors' rights generally,
and (ii) the rights of acceleration and the availability of equitable remedies may be limited by equitable principles of general
applicability.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k) The Company (i) is a limited liability company duly organized and validly existing in good standing
under the laws of the State of Indiana and (ii) is duly qualified to do business in each jurisdiction where the failure to be so
qualified would materially adversely affect the ability of the Company to perform its obligations under this Agreement, the First Mortgage
Indenture or the Bonds.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. *Purchase, Sale and Delivery of Bonds.* On the basis of the representations, warranties and agreements herein contained, but subject to the terms and conditions herein set forth, the Company agrees to sell to the Underwriters, and the Underwriters agree, severally and not jointly, to purchase from the Company, at a purchase price of 99.114% of the principal amount of the Bonds plus accrued interest, if any, from March 6, 2026 (and in the manner set forth below), the respective principal amount of Bonds set forth opposite the name of each Underwriter on Schedule A hereto plus the respective principal amount of additional Bonds which each such Underwriter may become obligated to purchase pursuant to the provisions of Section 8 hereof. The Underwriters hereby also agree to make a payment to the Company of $1,000,000 including in respect of expenses incurred by the Company in connection with the offering of the Bonds.

Payment of the purchase price for the Bonds to be purchased by the Underwriters and the payment referred to above shall be made to the Company by wire transfer of immediately available funds, payable to the order of the Company against delivery of the Bonds, in fully registered form, to you or upon your order at 10:00 a.m., New York City time, on March 6, 2026 or such other time and date as shall be mutually agreed upon in writing by the Company and the Representatives (the "**Closing Date**"). The Bonds shall be delivered in the form of one or more global certificates in aggregate denomination equal to the aggregate principal amount of the Bonds upon original issuance, and registered in the name of Cede & Co., as nominee for The Depository Trust Company ("**DTC**"). All other documents referred to herein that are to be delivered at the Closing Date shall be delivered at that time at the offices of Sidley Austin llp, 787 Seventh Avenue, New York, New York 10019.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. *Offering by the Underwriters.* It is understood that the several Underwriters propose to offer the Bonds for sale to the public as set forth in the Pricing Disclosure Package and the Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. *Covenants of the Company.* The Company covenants and agrees with the several Underwriters that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The Company will cause any Preliminary Prospectus and the Prospectus to be filed pursuant to, and in compliance
with, Rule 424(b) of the 1933 Act Regulations, and advise the Underwriters promptly of the filing of any amendment or supplement
to the Registration Statement, any Preliminary Prospectus or the Prospectus and of the institution by the Commission of any stop order
proceedings in respect of the Registration Statement, and will use its best efforts to prevent the issuance of any such stop order and
to obtain as soon as possible its lifting, if issued.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) If at any time when a prospectus relating to the Bonds (or the notice referred to in Rule 173(a) of
the 1933 Act Regulations) is required to be delivered under the 1933 Act any event occurs as a result of which the Pricing Disclosure
Package or the Prospectus as then amended or supplemented would include an untrue statement of a material fact, or omit to state any material
fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, or if it
is necessary at any time to amend the Pricing Disclosure Package or the Prospectus to comply with the 1933 Act, the Company promptly will
prepare and file with the Commission an amendment, a supplement or an appropriate document pursuant to Section 13 or 14 of the 1934
Act which will correct such statement or omission or which will effect such compliance.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) The Company, during the period when a prospectus relating to the Bonds is required to be delivered under
the 1933 Act, will timely file all documents required to be filed with the Commission pursuant to Section 13 or 14 of the 1934 Act.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) Without the prior consent of the Underwriters, the Company has not made and will not make any offer relating
to the Bonds that would constitute a "free writing prospectus" as defined in Rule 405 of the 1933 Act Regulations, other
than a Permitted Free Writing Prospectus; each Underwriter, severally and not jointly, represents and agrees that, without the prior consent
of the Company, it has not made and will not make any offer relating to the Bonds that would constitute a "free writing prospectus"
as defined in Rule 405 of the 1933 Act Regulations, other than a Permitted Free Writing Prospectus or a free writing prospectus that
is not required to be filed by the Company pursuant to Rule 433 of the 1933 Act Regulations ()"**Rule 433** ");
any such free writing prospectus (which shall include the pricing term sheet referred to in Section 5(e) below), the use of
which has been consented to by the Company and the Underwriters, is specified in Item 3 of Schedule B and herein is called a "**Permitted Free Writing Prospectus**." The Company represents that it has treated or agrees that it will treat each Permitted Free Writing
Prospectus as an "issuer free writing prospectus," as defined in Rule 433, and has complied and will comply with the
requirements of Rule 433 applicable to any Permitted Free Writing Prospectus, including timely filing with the Commission where required,
legending and record keeping.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) The Company agrees to prepare a pricing term sheet specifying the terms of the Bonds not contained in
any Preliminary Prospectus, substantially in the form of Schedule C hereto and approved by the Representatives on behalf of the Underwriters,
and to file such pricing term sheet as an "issuer free writing prospectus" pursuant to Rule 433 prior to the close of
business two business days after the date hereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) The Company agrees that if at any time following the issuance of a Permitted Free Writing Prospectus any
event occurs as a result of which such Permitted Free Writing Prospectus would conflict with the information (not superseded or modified
as of the Effective Date) in the Registration Statement, the Pricing Disclosure Package or the Prospectus or would include an untrue statement
of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances
then prevailing, not misleading, the Company will give prompt notice thereof to the Underwriters and, if requested by the Underwriters,
will prepare and furnish without charge to each Underwriter a free writing prospectus or other document, the use of which has been consented
to by the Underwriters, which will correct such conflict, statement or omission; provided, however, that this covenant shall not apply
to any statements or omissions made in reliance upon and in conformity with written information furnished to the Company by the Representatives
on behalf of the Underwriters specifically for use in the Registration Statement, the Pricing Disclosure Package or the Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) The Company will make generally available to its security holders, in each case as soon as practicable
but not later than 60 days after the close of the period covered thereby, earnings statements (in form complying with the provisions of
Rule 158 under the 1933 Act, which need not be certified by independent certified public accountants unless required by the 1933
Act) covering (i) a twelve-month period beginning not later than the first day of the Company's fiscal quarter next following
the effective date of the Registration Statement and (ii) a twelve-month period beginning not later than the first day of the Company's
fiscal quarter next following the date of this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) The Company will furnish to you, without charge, copies of the Registration Statement (three of which
will include all exhibits other than those incorporated by reference), the Pricing Disclosure Package and the Prospectus, and all amendments
and supplements to such documents, in each case as soon as available and in such quantities as you reasonably request.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The Company will arrange or cooperate in arrangements, if necessary, for the qualification of the Bonds
for sale under the laws of such jurisdictions as you designate and will continue such qualifications in effect so long as required for
the distribution; provided, however, that the Company shall not be required to qualify as a foreign limited liability company or to file
any general consents to service of process under the laws of any state where it is not now so subject.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j) The Company will pay all expenses incident to the performance of its obligations under this Agreement
including (i) the printing and filing of the Registration Statement and the printing of this Agreement and any Blue Sky Survey, (ii) the
preparation and printing of certificates for the Bonds, (iii) the issuance and delivery of the Bonds as specified herein, (iv) the
fees and disbursements of counsel for the Underwriters in connection with the qualification of the Bonds under the securities laws of
any jurisdiction in accordance with the provisions of Section 5(i) and in connection with the preparation of the Blue Sky Survey
(such fees not to exceed $7,500), (v) the printing and delivery to the Underwriters, in quantities as hereinabove referred to, of
copies of the Registration Statement and any amendments thereto, of any Preliminary Prospectus, of the Prospectus, of any Permitted Free
Writing Prospectus and any amendments or supplements thereto, (vi) any fees charged by independent rating agencies for rating the
Bonds, (vii) any fees and expenses in connection with the listing of the Bonds on the New York Stock Exchange LLC, (viii) any
filing fee required by the Financial Industry Regulatory Authority, Inc., (ix) the costs of any depository arrangements for
the Bonds with DTC or any successor depositary and (x) the costs and expenses of the Company relating to investor presentations on
any "road show" undertaken in connection with the marketing of the offering of the Bonds, including, without limitation, expenses
associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road
show presentations with the prior approval of the Company, travel and lodging expenses of the Underwriters and officers of the Company
and any such consultants, and the cost of any aircraft chartered in connection with the road show; provided, however, the Underwriters
shall reimburse a portion of the costs and expenses referred to in this clause (x).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6. *Conditions of the Obligations of the Underwriters.* The obligations of the several Underwriters to purchase and pay for the Bonds will be subject to the accuracy of the representations and warranties on the part of the Company herein, to the accuracy of the statements of officers of the Company made pursuant to the provisions hereof, to the performance by the Company of its obligations hereunder and to the following additional conditions precedent:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The Prospectus shall have been filed by the Company with the Commission pursuant to Rule 424(b) within
the applicable time period prescribed for filing by the 1933 Act Regulations and in accordance herewith and each Permitted Free Writing
Prospectus shall have been filed by the Company with the Commission within the applicable time periods prescribed for such filings by,
and otherwise in compliance with, Rule 433.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) At or after the Applicable Time and prior to the Closing Date, no stop order suspending the effectiveness
of the Registration Statement shall have been issued and no proceedings for that purpose or pursuant to Section 8A of the 1933 Act
shall have been instituted or, to the knowledge of the Company or you, shall be threatened by the Commission.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) At or after the Applicable Time and prior to the Closing Date, the rating assigned by Moody's Investors
Service, Inc. or S&P Global Ratings (or any of their successors) to any debt securities or preferred stock of the Company as
of the date of this Agreement shall not have been lowered.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) Since the respective most recent dates as of which information is given in the Pricing Disclosure Package
and the Prospectus and up to the Closing Date, there shall not have been any material adverse change in the condition of the Company and
its subsidiaries, taken as a whole, financial or otherwise, except as reflected in or contemplated by the Pricing Disclosure Package and
the Prospectus, and since such dates and up to the Closing Date, there shall not have been any material transaction entered into by the
Company other than transactions contemplated by the Pricing Disclosure Package and the Prospectus and transactions in the ordinary course
of business, the effect of which in your reasonable judgment is so material and adverse as to make it impracticable or inadvisable to
proceed with the public offering or the delivery of the Bonds on the terms and in the manner contemplated by the Pricing Disclosure Package
and the Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) You shall have received an opinion of Andrew Wells, Esq., Deputy General Counsel of Duke Energy Business
Services LLC, the service company subsidiary of Duke Energy Corporation (who in such capacity provides legal services to the Company)
(or other appropriate counsel reasonably satisfactory to the Representatives, which may include Duke Energy Corporation's other
 "in-house" counsel), dated the Closing Date, to the effect that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The Company is a limited liability company duly organized and validly existing under the laws of the State
of Indiana, with power and authority (limited liability company and other) to own its properties and conduct its business as described
in the Pricing Disclosure Package and the Prospectus and to enter into and perform its obligations under this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) South Construction Company, Inc., the Company's subsidiary, is a corporation duly organized
and validly existing under the laws of Indiana and has due corporate and governmental authority to carry on the business in which it is
engaged, except where the failure would not, singularly or in the aggregate, reasonably be expected to have a material adverse effect
on the consolidated financial position, member's equity, results of operations, business or prospects of the Company and its subsidiaries,
taken as a whole, and to own and operate the properties in use in such business.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) The execution, delivery and performance of this Agreement, the First Mortgage Indenture and the Bonds
and compliance by the Company with its obligations hereunder and thereunder (x) will not conflict with, or result in any charge or
encumbrance upon any of the assets of the Company (other than pursuant to the First Mortgage Indenture) pursuant to the terms of, or constitute
a default under, any agreement, indenture or instrument known to such counsel, or result in a violation of the Articles or Operating Agreement
of the Company (as in effect on the Closing Date) or any order, rule or regulation (also as in effect on the Closing Date) of any
court or governmental agency having jurisdiction over the Company and (y) the issuance of the Bonds in accordance with the First
Mortgage Indenture and the sale of the Bonds in accordance with this Agreement, do not and will not result in any violation by the Company
of any of the terms or provisions of the Articles or Operating Agreement, or of the First Mortgage Indenture, or any mortgage or other
agreement or instrument known to such counsel by which the Company is bound.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) The First Mortgage Indenture is in due and proper form, has been duly and validly authorized by all necessary
limited liability company action, has been duly executed and delivered by the Company, qualified under the 1939 Act, and, assuming due
authorization, execution and delivery by the Trustee, the First Mortgage Indenture is a valid and binding instrument of the Company, enforceable
in accordance with its terms, except as (i) the enforceability thereof may be limited by bankruptcy, insolvency, or similar laws
affecting mortgagees' and other creditors' rights generally, and (ii) the rights of acceleration and the availability
of equitable remedies may be limited by equitable principles of general applicability.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) The issue of the Bonds by the Company in accordance with the terms of the First Mortgage Indenture has
been duly authorized by all necessary limited liability company action; when duly executed by the Company, authenticated by the Trustee
and delivered to and paid for by the Underwriters pursuant to this Agreement, the Bonds will constitute the legal, valid and binding obligations
of the Company enforceable in accordance with their terms, secured by the lien of and entitled to the benefits provided by the First Mortgage
Indenture, except as (i) the enforceability thereof may be limited by bankruptcy, insolvency, or similar laws affecting mortgagees'
and other creditors' rights generally, and (ii) the rights of acceleration and the availability of equitable remedies may be
limited by equitable principles of general applicability.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) The Company has good and marketable title to the properties, rights and assets described in and conveyed
by the First Mortgage Indenture and not released by the Trustee from the lien thereof prior to the time of delivery of the Bonds, subject
only to the lien of the First Mortgage Indenture, to "permitted liens" as defined in the First Mortgage Indenture and to certain
encumbrances and defects in respect of certain properties in service the aggregate book value of which is not deemed material; the description
in the First Mortgage Indenture of such properties, rights and assets is adequate to constitute the First Mortgage Indenture a lien thereon;
the First Mortgage Indenture, subject only to the matters referred to above, constitutes a valid and direct first lien on such properties,
rights and assets, which include substantially all permanent fixed properties and franchises of the Company (except that real estate which
is not used or useful in the public utility business of the Company is excluded from the lien of the First Mortgage Indenture by the provisions
thereof); and all permanent fixed properties and franchises acquired by the Company subsequent to the time of issuance of the Bonds (except
that in certain cases real estate which is not used or useful in the public utility business of the Company is excluded from the lien
of the First Mortgage Indenture by the provisions thereof) will be subject to the lien of the First Mortgage Indenture, subject, however,
to "permitted liens" as defined in the First Mortgage Indenture and liens, if any, existing or placed on such properties at
the time of acquisition thereof by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vii) The First Mortgage Indenture, other than the Supplemental Indenture, has been duly filed for record in
such manner and in such places as are required by law in order to give constructive notice of, and to establish, preserve and protect
the lien of, the First Mortgage Indenture on all property of the Company of every kind referred to in the First Mortgage Indenture as
subject to the lien thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(viii) Except as referred to in the Pricing Disclosure Package and the Prospectus, there is no action, suit or
proceeding, inquiry or investigation, at law or in equity or before or by any court, public board or body, pending or, to such counsel's
knowledge, threatened against or affecting the Company, wherein an unfavorable decision, ruling or finding would (i) materially and
adversely affect the condition (financial or otherwise), results of operations, business or properties of the Company or (ii) materially
and adversely affect the transactions contemplated by this Agreement, or which would adversely affect the validity or enforceability of
the First Mortgage Indenture or the Bonds. The descriptions in the Registration Statement, the Pricing Disclosure Package and the Prospectus
of any legal or governmental proceedings are accurate and fairly present the information required to be shown, and such counsel does not
know of any litigation or any legal or governmental proceeding instituted or threatened against the Company or any of its properties that
would be required to be disclosed in the Registration Statement, the Pricing Disclosure Package or the Prospectus and is not so disclosed.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ix) An order of the IURC relating to the issuance of the Bonds has been duly entered and, to such counsel's
knowledge, has not been modified or repealed in any respect and is in full force and effect. The issuance and sale of the Bonds to the
Underwriters are in conformity with the terms of such order. Except as may be required under the 1933 Act or the securities or Blue Sky
laws of any jurisdiction, no further consent, approval, authorization or order of, or registration or filing with, any court or governmental
or public agency, authority or body is required with respect to the Company for the execution, delivery and performance of this Agreement,
the First Mortgage Indenture or the Bonds, the issuance by the Company of the Bonds or the consummation by the Company of the transactions
contemplated by this Agreement, the First Mortgage Indenture or the Bonds.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x) This Agreement has been duly authorized, executed and delivered by the Company.

In addition, such counsel shall state that no facts have come to such counsel's attention that have caused such counsel to believe that the Registration Statement, at the Applicable Time, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading, or that the Prospectus, as of its date and as of the Closing Date, contained or contains an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading (except that in each case such counsel need not express an opinion as to (i) the financial statements and other financial and accounting data included or incorporated by reference therein or excluded therefrom, including XBRL interactive data, (ii) the statement of the eligibility and qualification of the Trustee included in the Registration Statement or (iii) the information in the Prospectus Supplement under the caption "Book-Entry System"). Such counsel shall further state that, in addition, no facts have come to such counsel's attention that have caused such counsel to believe that the Pricing Disclosure Package, as of the Applicable Time, contained an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading (except that such counsel need not express an opinion as to (i) the financial statements and other financial and accounting data included or incorporated by reference therein or excluded therefrom, including XBRL interactive data, or (ii) the information in the Prospectus Supplement under the caption "Book-Entry System").

Such counsel shall expressly authorize the Underwriters to rely on such counsel's opinion dated the Closing Date delivered to the Trustee pursuant to the First Mortgage Indenture.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) You shall have received an opinion of Hunton Andrews Kurth LLP, counsel to the Company, dated the Closing
Date, to the effect that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The Supplemental Indenture has been duly authorized, executed and delivered by the Company, and assuming
due authorization, execution and delivery by the Trustee, the First Mortgage Indenture constitutes a legal, valid and binding obligation
of the Company enforceable against the Company in accordance with its terms (subject to applicable bankruptcy, insolvency, reorganization,
moratorium, fraudulent transfer and other similar laws affecting mortgagees' and other creditors' rights generally from time
to time in effect, and to general principals of equity, including, without limitation, concepts of materiality, reasonableness, good faith
and fair dealing, regardless of whether considered in a proceeding in equity or at law).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) The Bonds have been duly authorized and, when executed and authenticated in accordance with the provisions
of the Original Mortgage and delivered to and paid for by the Underwriters pursuant to this Agreement, will constitute legal, valid and
binding obligations of the Company entitled to the benefits of the Original Mortgage and enforceable against the Company in accordance
with their terms (subject to applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent transfer and other similar laws
affecting mortgagees' and other creditors' rights generally from time to time in effect and to general principals of equity,
including, without limitation, concepts of materiality, reasonableness, good faith and fair dealing, regardless of whether considered
in a proceeding in equity or at law).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) This Agreement has been duly authorized, executed and delivered by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) The statements set forth (i) under the caption "Description of First Mortgage Bonds"
in the Base Prospectus and (ii) under the caption "Description of the Mortgage Bonds" in the Pricing Disclosure Package
and the Prospectus, insofar as such statements purport to summarize certain provisions of the First Mortgage Indenture and the Bonds,
fairly summarize such provisions in all material respects.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) The statements set forth in the Pricing Disclosure Package and the Prospectus under the caption "Certain
U.S. Federal Income Tax Considerations," insofar as such statements purport to constitute summaries of matters of United States
federal income tax law, constitute accurate and complete summaries, in all material respects, subject to the qualifications set forth
therein.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) The Company is not, and solely after giving effect to the offering and sale of the Bonds and the application
of the proceeds thereof as described in the Prospectus, will not be subject to registration and regulation as an "investment company"
as such term is defined in the Investment Company Act of 1940, as amended.

In rendering the foregoing opinions, such counsel may state that it has relied as to certain factual matters on information obtained from public officials, officers and representatives of the Company and has assumed that the signatures on all documents examined by such counsel are genuine, and that such counsel has not independently verified such factual matters or assumptions. In giving their opinion, such counsel may rely on the opinion of Andrew Wells, Esq., Deputy General Counsel of Duke Energy Business Services, LLC, the service company subsidiary of Duke Energy Corporation (who in such capacity provides legal services to the Company) (or other appropriate counsel reasonably satisfactory to the Representatives, which may include Duke Energy Corporation's other "in-house" counsel), as to matters of Indiana law.

You shall also have received a statement of Hunton Andrews Kurth LLP, dated the Closing Date, to the effect that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) no facts have come to such counsel's attention that have caused such counsel to believe that the documents filed by the Company under the 1934 Act and the 1934 Act Regulations that are incorporated by reference in the preliminary prospectus supplement that forms a part of the Pricing Disclosure Package and the Prospectus, when filed, were not, on their face, appropriately responsive in all material respects to the requirements of the 1934 Act and the 1934 Act Regulations (except that in each case such counsel need not express any view with respect to the financial statements, schedules and other financial and accounting information included or incorporated by reference therein or excluded therefrom, including XBRL interactive data), (ii) no facts have come to such counsel's attention that have caused such counsel to believe that the Registration Statement, at the Applicable Time, and the Prospectus, as of its date, appeared on their face not to be appropriately responsive in all material respects to the requirements of the 1933 Act and the 1933 Act Regulations (except that in each case such counsel need not express any view with respect to the financial statements, schedules and other financial and accounting information included or incorporated by reference therein or excluded therefrom, including XBRL interactive data or that part of the Registration Statement that constitutes the statement of eligibility on the Form T-1) and (iii) no facts have come to such counsel's attention that have caused such counsel to believe that the Registration Statement, at the Applicable Time, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading, or that the Prospectus, as of its date and as of the Closing Date, contained or contains an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading (except that in each case such counsel need not express any view with respect to the financial statements, schedules and other financial and accounting information included or incorporated by reference therein or excluded therefrom, including XBRL interactive data, or that part of the Registration Statement that constitutes the statement of eligibility on the Form T-1). Such counsel shall further state that, in addition, no facts have come to such counsel's attention that have caused such counsel to believe that the Pricing Disclosure Package, as of the Applicable Time, contained an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading (except that such counsel need not express any view with respect to the financial statements, schedules and other financial and accounting information included or incorporated by reference therein or excluded therefrom, including XBRL interactive data).

In addition, such statement shall confirm that the Prospectus has been filed with the Commission within the time period required by Rule 424 of the 1933 Act Regulations and any required filing of a Permitted Free Writing Prospectus pursuant to Rule 433 of the 1933 Act Regulations has been made with the Commission within the time period required by Rule 433(d) of the 1933 Act Regulations. Such statement shall further state that assuming the accuracy of the factual matters contained in the representations and warranties of the Company set forth in Section 2(d) of this Agreement, the Registration Statement became effective upon filing with the Commission pursuant to Rule 462 of the 1933 Act Regulations and, pursuant to Section 309 of the 1939 Act, the First Mortgage Indenture has been qualified under the 1939 Act, and that based solely on such counsel's review of the Commission's website, no stop order suspending the effectiveness of the Registration Statement has been issued and, to such counsel's knowledge, no proceedings for that purpose have been instituted or are pending or threatened by the Commission.

In addition, such counsel may state that such counsel does not pass upon, or assume any responsibility for, the accuracy, completeness or fairness of the statements contained or incorporated by reference in the Registration Statement, the Pricing Disclosure Package or the Prospectus and has made no independent check or verification thereof (except to the limited extent referred to in Sections 6(f)(iv) and (v) above).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) You shall have received a letter from Sidley Austin llp ,
counsel for the Underwriters, dated the Closing Date, with respect to such opinions and statements as you may reasonably request, and
the Company shall have furnished to such counsel such documents as it may request for the purpose of enabling it to pass upon such matters.
In delivering its letter pursuant to this Section 6(g), Sidley Austin llp may rely
on the opinion of Andrew Wells, Esq., Deputy General Counsel of Duke Energy Business Services LLC, the service company subsidiary
of Duke Energy Corporation (or other appropriate counsel reasonably satisfactory to the Representatives, which may include Duke Energy
Corporation's other "in-house" counsel) as to matters of Indiana law.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) On or after the date hereof, there shall not have occurred any of the following: (i) a suspension
or material limitation in trading in securities generally or of the securities of the Company or Duke Energy Corporation, on the New York
Stock Exchange LLC; or (ii) a general moratorium on commercial banking activities in New York declared by either Federal or New York
State authorities or a material disruption in commercial banking services or securities settlement or clearance services in the United
States; or (iii) the outbreak or escalation of hostilities involving the United States or the declaration by the United States of
a national emergency or war, if the effect of any such event specified in this subsection (h) in your reasonable judgment makes it
impracticable or inadvisable to proceed with the public offering or the delivery of the Bonds on the terms and in the manner contemplated
in the Pricing Disclosure Package and the Prospectus. In such event there shall be no liability on the part of any party to any other
party except as otherwise provided in Section 7 hereof and except for the expenses to be borne by the Company as provided in Section 5(j) hereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) You shall have received a certificate of the Chairman of the Board, the President, any Vice President,
the Secretary or an Assistant Secretary and any financial or accounting officer of the Company, dated the Closing Date, in which such
officers, to the best of their knowledge after reasonable investigation, shall state that the representations and warranties of the Company
in this Agreement are true and correct as of the Closing Date, that the Company has complied with all agreements and satisfied all conditions
on its part to be performed or satisfied at or prior to the Closing Date, that the conditions specified in Section 6(c) and
Section 6(d) have been satisfied, and that no stop order suspending the effectiveness of the Registration Statement has been
issued and no proceedings for that purpose have been instituted or are threatened by the Commission.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j) At the time of the execution of this Agreement, you shall have received a letter dated such date, in form
and substance satisfactory to you, from Deloitte & Touche LLP, the Company's independent registered public accounting firm,
containing statements and information of the type ordinarily included in accountants' "comfort letters" to underwriters
with respect to the financial statements and certain financial information contained in or incorporated by reference into the Registration
Statement, the Pricing Disclosure Package and the Prospectus, including specific references to inquiries regarding any increase in
long-term debt (excluding current maturities), decrease in net current assets (defined as current assets less current liabilities) or member's
equity, and decrease in operating revenues or net income for the period subsequent to the latest financial statements incorporated
by reference in the Registration Statement when compared with the corresponding period from the preceding year, as of a specified date
not more than three business days prior to the date of this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k) At the Closing Date, you shall have received from Deloitte & Touche LLP, a letter dated as of
the Closing Date, to the effect that they reaffirm the statements made in the letter furnished pursuant to subsection (j) of this
Section 6, except that the specified date referred to shall be not more than three business days prior to the Closing Date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l) An appropriate order or orders of the IURC necessary to permit the issue and sale of the Bonds as contemplated
hereby and containing no material provision or condition which is unacceptable to the Company or the Underwriters shall be in effect and
no proceedings to suspend the effectiveness of such order or orders shall be pending or threatened.

The Company will furnish you with such conformed copies of such opinions, certificates, letters and documents as you reasonably request.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7. *Indemnification.* (a) The Company agrees to indemnify and hold harmless each Underwriter, their respective officers and directors, and each person, if any, who controls any Underwriter within the meaning of Section 15 of the 1933 Act, as follows:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) against any and all loss, liability, claim, damage and expense whatsoever arising out of any untrue statement
or alleged untrue statement of a material fact contained in the Registration Statement (or any amendment thereto) including the Rule 430B
Information, or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements
therein not misleading or arising out of any untrue statement or alleged untrue statement of a material fact contained in the Preliminary
Prospectus, the Pricing Disclosure Package, the Prospectus (or any amendment or supplement thereto) or any Permitted Free Writing Prospectus,
or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading, unless such statement or omission or such alleged statement or omission was
made in reliance upon and in conformity with written information furnished to the Company by the Representatives on behalf of the Underwriters
expressly for use in the Registration Statement (or any amendment thereto), the Preliminary Prospectus, the Pricing Disclosure Package,
the Prospectus (or any amendment or supplement thereto) or any Permitted Free Writing Prospectus;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) against any and all loss, liability, claim, damage and expense whatsoever to the extent of the aggregate
amount paid in settlement of any litigation, commenced or threatened, or of any claim whatsoever based upon any such untrue statement
or omission or any such alleged untrue statement or omission, if such settlement is effected with the written consent of the Company;
and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) against any and all expense whatsoever reasonably incurred in investigating, preparing or defending against
any litigation, commenced or threatened, or any claim whatsoever based upon any such untrue statement or omission, or any such alleged
untrue statement or omission, to the extent that any such expense is not paid under (i) or (ii) of this subsection 7(a).

In no case shall the Company be liable under this indemnity agreement with respect to any claim made against any Underwriter or any such controlling person unless the Company shall be notified in writing of the nature of the claim within a reasonable time after the assertion thereof, but failure so to notify the Company shall not relieve it from any liability which it may have otherwise than under subsections 7(a) and 7(d). The Company shall be entitled to participate at its own expense in the defense, or if it so elects within a reasonable time after receipt of such notice, to assume the defense of any suit, but if it so elects to assume the defense, such defense shall be conducted by counsel chosen by it and approved by the Underwriter or Underwriters or controlling person or persons, or defendant or defendants in any suit so brought, which approval shall not be unreasonably withheld. In any such suit, any Underwriter or any such controlling person shall have the right to employ its own counsel, but the fees and expenses of such counsel shall be at the expense of such Underwriter or such controlling person unless (i) the Company and such Underwriter shall have mutually agreed to the employment of such counsel, or (ii) the named parties to any such action (including any impleaded parties) include both such Underwriter or such controlling person and the Company and such Underwriter or such controlling person shall have been advised by such counsel that a conflict of interest between the Company and such Underwriter or such controlling person may arise and for this reason it is not desirable for the same counsel to represent both the indemnifying party and also the indemnified party (it being understood, however, that the Company shall not, in connection with any one such action or separate but substantially similar or related actions in the same jurisdiction arising out of the same general allegations or circumstances, be liable for the reasonable fees and expenses of more than one separate firm of attorneys for all such Underwriters and all such controlling persons, which firm shall be designated in writing by you). The Company agrees to notify you within a reasonable time of the assertion of any claim against it, any of its officers or directors or any person who controls the Company within the meaning of Section 15 of the 1933 Act, in connection with the sale of the Bonds.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Each Underwriter severally and not jointly agrees that it will indemnify and hold harmless the Company,
its directors and each of the officers of the Company who signed the Registration Statement and each person, if any, who controls the
Company within the meaning of Section 15 of the 1933 Act to the same extent as the indemnity contained in subsection (a) of
this Section 7, but only with respect to statements or omissions made in the Registration Statement (or any amendment thereto), the
Preliminary Prospectus, the Pricing Disclosure Package, the Prospectus (or any amendment or supplement thereto) or any Permitted Free
Writing Prospectus, in reliance upon and in conformity with written information furnished to the Company by the Representatives on behalf
of the Underwriters expressly for use in the Registration Statement (or any amendment thereto), the Preliminary Prospectus, the Pricing
Disclosure Package, the Prospectus (or any amendment or supplement thereto) or any Permitted Free Writing Prospectus. In case any action
shall be brought against the Company or any person so indemnified based on the Registration Statement (or any amendment thereto), the
Preliminary Prospectus, the Pricing Disclosure Package, the Prospectus (or any amendment or supplement thereto) or any Permitted Free
Writing Prospectus, and in respect of which indemnity may be sought against any Underwriter, such Underwriter shall have the rights and
duties given to the Company, and the Company and each person so indemnified shall have the rights and duties given to the Underwriters,
by the provisions of subsection (a) of this Section 7.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement
of any pending or threatened proceeding in respect of which any indemnified party is or could have been a party and indemnity could have
been sought hereunder by such indemnified party, unless such settlement includes an unconditional release of such indemnified party from
all liability on claims that are the subject matter of such proceeding, and does not include a statement as to or an admission of fault,
culpability or a failure to act by or on behalf of any indemnified party.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) If the indemnification provided for in this Section 7 is unavailable to or insufficient to hold harmless
an indemnified party in respect of any and all loss, liability, claim, damage and expense whatsoever (or actions in respect thereof) that
would otherwise have been indemnified under the terms of such indemnity, then each indemnifying party shall contribute to the amount paid
or payable by such indemnified party as a result of such loss, liability, claim, damage or expense (or actions in respect thereof) in
such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the
other from the offering of the Bonds. If, however, the allocation provided by the immediately preceding sentence is not permitted by applicable
law, or if the indemnified party failed to give the notice required above, then each indemnifying party shall contribute to such amount
paid or payable by such indemnified party in such proportion as is appropriate to reflect not only such relative benefits but also the
relative fault of the Company on the one hand and the Underwriters on the other in connection with the statements or omissions which resulted
in such loss, liability, claim, damage or expense (or actions in respect thereof), as well as any other relevant equitable considerations.
The relative benefits received by the Company on the one hand and the Underwriters on the other shall be deemed to be in the same proportion
as the total net proceeds from the offering (before deducting expenses) received by the Company bear to the total compensation received
by the Underwriters in respect of the underwriting discount as set forth in the table on the cover page of the Prospectus. The relative
fault shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information supplied by the Company on the one hand or the Underwriters
on the other and the parties' relative intent, knowledge, access to information and opportunity to correct or prevent such statement or
omission. The Company and the Underwriters agree that it would not be just and equitable if contributions pursuant to this Section 7
were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of
allocation which does not take account of the equitable considerations referred to above in this Section 7. The amount paid or payable
by an indemnified party as a result of the losses, liabilities, claims, damages or expenses (or actions in respect thereof) referred to
above in this Section 7 shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection
with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 7, no Underwriter shall
be required to contribute any amount in excess of the amount by which the total price at which the Bonds underwritten by it and distributed
to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by
reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within
the meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from any person who was not guilty of such fraudulent
misrepresentation. The Underwriters' obligations to contribute are several in proportion to their respective underwriting obligations
and not joint.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8. *Default by One or More of the Underwriters.* (a) If any Underwriter shall default in its obligation to purchase the principal amount of the Bonds which it has agreed to purchase hereunder on the Closing Date, you may in your discretion arrange for you or another party or other parties to purchase such Bonds on the terms contained herein. If within twenty-four hours after such default by any Underwriter you do not arrange for the purchase of such Bonds, then the Company shall be entitled to a further period of twenty-four hours within which to procure another party or other parties satisfactory to you to purchase such Bonds on such terms. In the event that, within the respective prescribed periods, you notify the Company that you have so arranged for the purchase of such Bonds, or the Company notifies you that it has so arranged for the purchase of such Bonds, you or the Company shall have the right to postpone such Closing Date for a period of not more than seven days, in order to effect whatever changes may thereby be made necessary in the Registration Statement, the Pricing Disclosure Package or the Prospectus, or in any other documents or arrangements, and the Company agrees to file promptly any amendments to the Registration Statement, the Pricing Disclosure Package or the Prospectus which may be required. The term "Underwriter" as used in this Agreement shall include any person substituted under this Section 8 with like effect as if such person had originally been a party to this Agreement with respect to such Bonds.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) If, after giving effect to any arrangements for the purchase of the Bonds of a defaulting Underwriter
or Underwriters by you or the Company as provided in subsection (a) above, the aggregate amount of such Bonds which remains unpurchased
does not exceed one-tenth of the aggregate amount of all the Bonds to be purchased at such Closing Date, then the Company shall have the
right to require each non-defaulting Underwriter to purchase the amount of Bonds which such Underwriter agreed to purchase hereunder at
such Closing Date and, in addition, to require each non-defaulting Underwriter to purchase its pro rata share (based on the amount of
Bonds which such Underwriter agreed to purchase hereunder) of the Bonds of such defaulting Underwriter or Underwriters for which such
arrangements have not been made; but nothing herein shall relieve a defaulting Underwriter from liability for its default.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) If, after giving effect to any arrangements for the purchase of the Bonds of a defaulting Underwriter
or Underwriters by you or the Company as provided in subsection (a) above, the aggregate amount of such Bonds which remains unpurchased
exceeds one-tenth of the aggregate amount of all the Bonds to be purchased at such Closing Date, or if the Company shall not exercise
the right described in subsection (b) above to require non-defaulting Underwriters to purchase the Bonds of a defaulting Underwriter
or Underwriters, then this Agreement shall thereupon terminate, without liability on the part of any non-defaulting Underwriter or the
Company, except for the expenses to be borne by the Company as provided in Section 5(j) hereof and the indemnity and contribution
agreement in Section 7 hereof; but nothing herein shall relieve a defaulting Underwriter from liability for its default.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9. *Representations and Indemnities to Survive Delivery.* The respective indemnities, agreements, representations, warranties and other statements of the Company or its officers and of the several Underwriters set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation, or statement as to the results thereof, made by or on behalf of any Underwriter or the Company, or any of their respective officers or directors or any controlling person referred to in Section 7 hereof, and will survive delivery of and payment for the Bonds.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10. *Reliance on Your Acts.* In all dealings hereunder, the Representatives shall act on behalf of each of the Underwriters, and the Company shall be entitled to act and rely upon any statement, request, notice or agreement on behalf of any Underwriter made or given by the Representatives.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11. *No Fiduciary Relationship*. The Company acknowledges and agrees that (i) the purchase and sale of the Bonds pursuant to this Agreement is an arm's-length commercial transaction between the Company on the one hand, and the Underwriters on the other hand, (ii) in connection with the offering contemplated hereby and the process leading to such transaction, each Underwriter is and has been acting solely as a principal and is not the agent or fiduciary of the Company or its shareholders, creditors, employees, or any other party, (iii) no Underwriter has assumed or will assume an advisory or fiduciary responsibility in favor of the Company with respect to the offering contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company on other matters) and no Underwriter has any obligation to the Company with respect to the offering contemplated hereby except the obligations expressly set forth in this Agreement, (iv) the Underwriters and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company, and (v) the Underwriters have not provided any legal, accounting, regulatory or tax advice with respect to the transaction contemplated hereby and the Company has consulted its own legal, accounting, regulatory and tax advisors to the extent it deemed appropriate.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;12. Recognition of the U.S. Special Resolution Regimes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) In the event that any Underwriter that is a Covered Entity (as defined below) becomes subject to a proceeding under a U.S. Special Resolution Regime (as defined below), the transfer from such Underwriter of this Agreement, and any interest and obligation in or under this Agreement, will be effective to the same extent as the transfer would be effective under the U.S. Special Resolution Regime if this Agreement, and any such interest and obligation, were governed by the laws of the United States or a state of the United States.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) In the event that any Underwriter that is a Covered Entity or a BHC Act Affiliate (as defined below) of such Underwriter becomes subject to a proceeding under a U.S. Special Resolution Regime, Default Rights (as defined below) under this Agreement that may be exercised against such Underwriter are permitted to be exercised to no greater extent than such Default Rights could be exercised under the U.S. Special Resolution Regime if this Agreement were governed by the laws of the United States or a state of the United States.

As used in this Section 12:

"**BHC Act Affiliate**" has the meaning assigned to the term "affiliate" in, and shall be interpreted in accordance with, 12 U.S.C. § 1841(k).

"**Covered Entity**" means any of the following:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) a "covered entity" as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 252.82(b);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) a "covered bank" as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 47.3(b); or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) a "covered FSI" as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 382.2(b).

"**Default Right**" has the meaning assigned to that term in, and shall be interpreted in accordance with, 12 C.F.R. §§ 252.81, 47.2 or 382.1, as applicable.

"**U.S. Special Resolution Regime**" means each of (i) the Federal Deposit Insurance Act and the regulations promulgated thereunder and (ii) Title II of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations promulgated thereunder.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;13. *Notices.* All communications hereunder will be in writing and, if sent to the Underwriters, will be mailed or telecopied and confirmed to BMO Capital Markets Corp., 151 West 42nd Street, 32nd Floor, New York, New York 10036, Attention: Legal Department, Fax: (212) 702-1205; CIBC World Markets Corp., 300 Madison Avenue, 8th Floor, New York, New York 10017, Attention: Execution Management, Email: DLCIBCUSEMG@cibc.com; MUFG Securities Americas Inc., 1221 Avenue of the Americas, 6th Floor, New York, New York 10020, Attention: Capital Markets Group, Facsimile: (646) 434- 3455; U.S. Bancorp Investments, Inc., 214 N. Tryon Street, 26th Floor, Charlotte, North Carolina 28202, Attention: Credit Fixed Income, Facsimile: (877) 774-3462, or, if sent to the Company, will be mailed or telecopied and confirmed to it at 525 S. Tryon Street, Charlotte, North Carolina 28202, Attention: Nicholas J. Giaimo, Senior Vice President, Treasurer and Chief Risk Officer, Telephone: (704) 382-5826. Any such communications shall take effect upon receipt thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14. *Business Day.* As used herein, the term "business day" shall mean any day when the Commission's office in Washington, D.C. is open for business.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15. *Successors.* This Agreement shall inure to the benefit of and be binding upon the Underwriters and the Company and their respective successors. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any person, firm or corporation, other than the parties hereto and their respective successors and the controlling persons, officers and directors referred to in Section 7 and their respective successors, heirs and legal representatives, any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision herein contained; this Agreement and all conditions and provisions hereof being intended to be and being for the sole and exclusive benefit of the parties hereto and their respective successors and said controlling persons, officers and directors and their respective successors, heirs and legal representatives, and for the benefit of no other person, firm or corporation. No purchaser of Bonds from any Underwriter shall be deemed to be a successor or assign by reason merely of such purchase.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;16. *Counterparts; Electronic Signatures.* This Agreement may be executed in two or more counterparts, each of which when so executed shall be deemed to be an original and all of which when taken together shall constitute one and the same instrument. The words "execution," "signed," "signature," and words of like import in this Agreement or in any other certificate, agreement or document related to this Agreement, the Indenture or the Bonds shall include images of manually executed signatures transmitted by facsimile or other electronic format (including, without limitation, "pdf", "tif" or "jpg") and other electronic signatures (including, without limitation, DocuSign and AdobeSign). The use of electronic signatures and electronic records (including, without limitation, any contract or other record created, generated, sent, communicated, received, or stored by electronic means) shall be of the same legal effect, validity and enforceability as a manually executed signature or use of a paper-based record-keeping system to the fullest extent permitted by applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act and any other applicable law, including, without limitation, any state law based on the Uniform Electronic Transactions Act or the Uniform Commercial Code.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;17. *Applicable Law.* This Agreement shall be governed by, and construed in accordance with, the laws of the State of New York.

If the foregoing is in accordance with your understanding, kindly sign and return to us two counterparts hereof, and upon confirmation and acceptance by the Underwriters, this Agreement and such confirmation and acceptance will become a binding agreement between the Company, on the one hand, and each of the Underwriters, on the other hand, in accordance with its terms.

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| | |
|:---|:---|
| Very truly yours, | Very truly yours, |
| Duke Energy Indiana, LLC | Duke Energy Indiana, LLC |
| By: | /s/ Jordan Morgan |
|  | Name: Jordan Morgan |
|  | Title: Assistant Treasurer |

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[*Remainder of page left blank intentionally*]

[Signature Page – Underwriting Agreement]

The foregoing Underwriting Agreement is hereby<br> confirmed and accepted as of the date first above written:

BMO CAPITAL MARKETS CORP.

CIBC WORLD MARKETS CORP.

MUFG SECURITIES AMERICAS INC.

U.S. BANCORP INVESTMENTS, INC.

On behalf of each of the Underwriters

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| | |
|:---|:---|
| BMO CAPITAL MARKETS CORP. | CIBC WORLD MARKETS CORP. |
| /s/ Mark Spadaccini | /s/ Michael Kim |
| Name: Mark Spadaccini | Name: Michael Kim |
| Title: Managing Director | Title: Managing Director and Head, US Investment Grade DCM |
| MUFG SECURITIES AMERICAS INC. | U.S. BANCORP INVESTMENTS, INC. |
| /s/ Maheen Baig | /s/ Brent Kreissl |
| Name: Maheen Baig | Name: Brent Kreissl |
| Title: Managing Director | Title: Managing Director |

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[Signature Page – Underwriting Agreement]

**SCHEDULE A**

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| | |
|:---|:---|
| Underwriter | Principal Amount <br> of Bonds |
| BMO CAPITAL MARKETS CORP. | $100000000 |
| CIBC WORLD MARKETS CORP. | 100000000 |
| MUFG SECURITIES AMERICAS INC. | 100000000 |
| U.S. BANCORP INVESTMENTS, INC. | 100000000 |
| HUNTINGTON SECURITIES, INC. | 28000000 |
| KEYBANC CAPITAL MARKETS INC. | 28000000 |
| REGIONS SECURITIES LLC | 28000000 |
| CASTLEOAK SECURITIES, L.P. | 8000000 |
| STERN BROTHERS & CO. | 8000000 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total | $500000000 |

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**SCHEDULE B**

**PRICING DISCLOSURE PACKAGE**

1) Base Prospectus

2) Preliminary Prospectus Supplement dated March 4, 2026

3) Permitted Free Writing Prospectus

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a) Pricing Term Sheet attached as Schedule C hereto

**SCHEDULE C**

***Filed pursuant to Rule 433***

***March 4, 2026***

***Relating to***

***Preliminary Prospectus Supplement dated March 4, 2026***

***to***

***Prospectus dated September 23, 2025***

***Registration Statement No. 333-290475-03***

**DUKE ENERGY indiana, LLC<br> $500,000,000 FIRST MORTGAGE BONDS, SERIES DDDD, 4.95%, DUE MARCH 15, 2036**

<u>Pricing Term Sheet</u>

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| | |
|:---|:---|
| Issuer: | Duke Energy Indiana, LLC (the "**Issuer**") |
| Trade Date: | March 4, 2026 |
| Settlement Date: | March 6, 2026; T+2 |
| Security Description: | First Mortgage Bonds, Series DDDD, 4.95%, Due March 15, 2036 (the "**Mortgage Bonds**") |
| Interest Payment Dates: | March 15 and September 15 of each year, beginning on September 15, 2026 |
| Principal Amount: | $500000000 |
| Maturity Date: | March 15, 2036 |
| Coupon: | 4.95% |
| Benchmark Treasury: | 4.125% due February 15, 2036 |
| Benchmark Treasury Price: | 100-11+ |
| Benchmark Treasury Yield: | 4.080% |
| Spread to Benchmark Treasury: | + 90 bps |
| Yield to Maturity: | 4.980% |
| Price to Public: | 99.764% per Mortgage Bond |

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---

| | |
|:---|:---|
| Redemption Provisions/ Make-Whole Call: | Prior to December 15, 2035 (the date that is three months prior to the maturity date of the Mortgage Bonds (the "**Par Call Date**")), the Issuer may redeem the Mortgage Bonds at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Mortgage Bonds matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points less (b) interest accrued to the redemption date; and 100% of the principal amount of the Mortgage Bonds to be redeemed, plus, in either case, accrued and unpaid interest thereon to, but excluding the redemption date.<br>On or after the Par Call Date, the Issuer may redeem the Mortgage Bonds at its option, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Mortgage Bonds to be redeemed plus accrued and unpaid interest thereon to, but excluding, the redemption date. |
| CUSIP / ISIN: | 26443T AG1 / US26443TAG13 |
| Joint Book-Running Managers: | BMO Capital Markets Corp.<br> CIBC World Markets Corp.<br> MUFG Securities Americas Inc.<br> U.S. Bancorp Investments, Inc. |
| Co-Managers: | Huntington Securities, Inc.<br> KeyBanc Capital Markets Inc.<br> Regions Securities LLC<br> CastleOak Securities, L.P.<br> Stern Brothers & Co. |

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**The Issuer has filed a registration statement (including a prospectus) with the Securities and Exchange Commission (the "SEC") for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the Issuer has filed with the SEC for more complete information about the Issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the Issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus if you request it by calling BMO Capital Markets Corp. toll-free at (888) 200-0266, CIBC World Markets Corp. toll-free at (800) 282-0822, MUFG Securities Americas Inc. toll-free at (877) 649-6848 or U.S. Bancorp Investments, Inc. toll-free at (877) 558-2607.**