# EDGAR Filing Document

**Accession Number:** 0001160661
**File Stem:** 0001160661-25-000021
**Filing Date:** 2025-9
**Character Count:** 381203
**Document Hash:** 1f4cb279657f68623c7d07ec637f3826
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001160661-25-000021.hdr.sgml**: 20250919

**ACCESSION NUMBER**: 0001160661-25-000021

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 21

**CONFORMED PERIOD OF REPORT**: 20250916

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20250919

**DATE AS OF CHANGE**: 20250919

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SOUTHERN POWER CO
- **CENTRAL INDEX KEY:** 0001160661
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 582598670

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-37803
- **FILM NUMBER:** 251325939

**BUSINESS ADDRESS:**
- **STREET 1:** 30 IVAN ALLEN JR. BLVD
- **CITY:** ATLANTA
- **STATE:** GA
- **ZIP:** 30308
- **BUSINESS PHONE:** 4045065000

**MAIL ADDRESS:**
- **STREET 1:** 30 IVAN ALLEN JR. BLVD
- **CITY:** ATLANTA
- **STATE:** GA
- **ZIP:** 30308

?xml version='1.0' encoding='ASCII'? so-20250916

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) <u>September 16, 2025</u>

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| | | |
|:---|:---|:---|
| **Commission<br>File Number** | **Registrant,<br>State of Incorporation,<br>Address and Telephone Number** | **I.R.S. Employer<br>Identification No.** |

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| | | |
|:---|:---|:---|
| 001-37803 | **Southern Power Company** | 58-2598670 |

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(A Delaware Corporation)

30 Ivan Allen Jr. Boulevard, N.W.

Atlanta, Georgia 30308

(404) 506-5000

The name and address of the registrant have not changed since the last report.

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))

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

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| | | | |
|:---|:---|:---|:---|
| Registrant | Title of each class | Trading<br>Symbol(s) | Name of each exchange<br>on which registered |
| Southern Power Company | Series 2016B 1.850% Senior Notes due 2026 | SO/26A | New York Stock Exchange |

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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. ☐

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| | |
|:---|:---|
| **Item 8.01.** | **<u>Other Events</u>.** |

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On September 16, 2025, Southern Power Company (the "Company") entered into Underwriting Agreements covering the issue and sale of $550,000,000 aggregate principal amount of its Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Series 2025A Senior Notes") and $550,000,000 aggregate principal amount of its Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Series 2025B Senior Notes"). Both the Series 2025A Senior Notes and the Series 2025B Senior Notes were registered under the Securities Act of 1933, as amended, pursuant to the shelf registration statement (Registration No. 333-289172) of the Company.

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| | |
|:---|:---|
| **Item 9.01.** | **<u>Financial Statements and Exhibits</u>.** |

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| | |
|:---|:---|
| (d) Exhibits. | (d) Exhibits. |
| 1.2(a) | <u>[Underwriting Agreement relating to the Series 2025A Senior Notes, dated September 16, 2025, among the Company and BMO Capital Markets Corp., Mizuho Securities USA LLC, PNC Capital Markets LLC and SMBC Nikko Securities America, Inc., as representatives of the several Underwriters named in Schedule I thereto.](ex1-2asouthernpowerx2025au.htm)</u> |
| 1.2(b) | <u>[Underwriting Agreement relating to the Series 2025B Senior Notes, dated September 16, 2025, among the Company and BMO Capital Markets Corp., Mizuho Securities USA LLC, PNC Capital Markets LLC and SMBC Nikko Securities America, Inc., as representatives of the several Underwriters named in Schedule I thereto.](ex1-2bsouthernpowerx2025bu.htm)</u> |
| 4.6(a) | <u>[First Supplemental Indenture to Senior Note Indenture dated as of September 19, 2025, providing for the issuance of the Series 2025A Senior Notes.](ex4-6aspc1stsupplementalin.htm)</u> |
| 4.6(b) | <u>[Second Supplemental Indenture to Senior Note Indenture dated as of September 19, 2025, providing for the issuance of the Series 2025B Senior Notes.](ex4-6bspc2ndsupplementalin.htm)</u> |
| 4.9(a) | Form of the Series 2025A Senior Note (included in Exhibit 4.6(a) above). |
| 4.9(b) | Form of the Series 2025B Senior Note (included in Exhibit 4.6(b) above). |
| 5.1(a) | <u>[Opinion of Troutman Pepper Locke LLP relating to the Series 2025A Senior Notes.](ex5-1aspc2025asrnotes.htm)</u> |
| 5.1(b) | <u>[Opinion of Troutman Pepper Locke LLP relating to the Series 2025B Senior Notes](ex5-1bspc2025bsrnotes.htm)</u>. |
| 8.1(a) | <u>[Tax Opinion of Troutman Pepper Locke LLP relating to the Series 2025A Senior Notes.](ex8-1aspc2025atroutmanex8o.htm)</u> |

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| | |
|:---|:---|
| 8.1(b) | <u>[Tax Opinion of Troutman Pepper Locke LLP relating to the Series 2025B Senior Notes.](ex8-1bspc2025btroutmanex8o.htm)</u> |
| 23.1 | Consent of Troutman Pepper Locke LLP (included in Exhibit 5.1(a) above) . |
| 23.2 | Consent of Troutman Pepper Locke LLP (included in Exhibit 5.1(b) above) . |
| 23.3 | Consent of Troutman Pepper Locke LLP (included in Exhibit 8.1(a) above). |
| 23.4 | Consent of Troutman Pepper Locke LLP (included in Exhibit 8.1(b) above). |
| 104 | Cover Page Interactive Data File – The cover page iXBRL tags are embedded within the inline XBRL document. |

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SIGNATURE

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

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| | | |
|:---|:---|:---|
| Date: September 19, 2025 | SOUTHERN POWER COMPANY | SOUTHERN POWER COMPANY |
| | By | /s/Melissa K. Caen |
| | | Melissa K. Caen<br>Assistant Secretary |

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## Exhibit 1.2

Exhibit 1.2(a)

$550,000,000

Series 2025A 4.25% Senior Notes

due October 1, 2030

**SOUTHERN POWER COMPANY**

UNDERWRITING AGREEMENT

September 16, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

as Representatives of the Several Underwriters named in Schedule I hereto

Ladies and Gentlemen:

Southern Power Company, a Delaware corporation (the "Company"), confirms its agreement (the "Agreement") with you and each of the other Underwriters named in Schedule I hereto (collectively, the "Underwriters," which term shall also include any underwriter substituted as hereinafter provided in Section 11 hereof) for whom you are acting as representatives (in such capacity you shall hereinafter be referred to as the "Representatives"), with respect to the sale by the Company and the purchase by the Underwriters, acting severally and not jointly, of $550,000,000 aggregate principal amount of the Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Senior Notes") as set forth in Schedule I hereto.

The Company understands that the Underwriters propose to make a public offering of the Senior Notes as soon as the Representatives deem advisable after this Agreement has been executed and delivered. The Senior Notes will be issued pursuant to an indenture, dated as of August 1, 2025 (the "Base Indenture"), by and between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as to be supplemented by a first supplemental indenture, dated as of September 19, 2025, to the Base Indenture relating to the Senior Notes (the "First Supplemental Indenture" and, together with the Base Indenture and any

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other amendments or supplements thereto, the "Indenture"), between the Company and the Trustee.

The Company is concurrently offering $550,000,000 aggregate principal amount of its Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Series 2025B Senior Notes"), pursuant to a separate underwriting agreement to be entered into by and among the Company and the underwriters named therein.

SECTION 1.&nbsp;&nbsp;&nbsp;&nbsp;<u>REPRESENTATIONS AND WARRANTIES</u>. The Company represents and warrants to the Underwriters 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)&nbsp;&nbsp;&nbsp;&nbsp;A registration statement on Form S-3 (File No. 333-289172) in respect of the Senior Notes and certain other securities has been prepared and filed in accordance with the provisions of the Securities Act of 1933, as amended (the "1933 Act"), with the Securities and Exchange Commission (the "Commission"); such registration statement and any post-effective amendment thereto, each in the form heretofore delivered or to be delivered to the Underwriters, has been declared effective by the Commission in such form (except that copies of the registration statement and any post-effective amendment delivered to the Underwriters need not include exhibits but shall include all documents incorporated by reference therein); 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 against the Company or related to the offering has been initiated or, to the best knowledge of the Company, threatened by the Commission (any preliminary prospectus, as supplemented by a preliminary prospectus supplement, included in such registration statement or filed with the Commission pursuant to Rule 424(a) of the rules and regulations of the Commission under the 1933 Act, being hereinafter called a "Preliminary Prospectus"); such registration statement as used with respect to the Senior Notes, including the information deemed a part thereof pursuant to Rule 430B(f)(1) under the 1933 Act 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 Senior Notes pursuant to Rule 430B(f)(2) under the 1933 Act (the "Effective Date"), including the exhibits thereto and all documents incorporated by reference therein pursuant to Item 12 of Form S-3 at the Effective Date, being hereinafter called the "Registration Statement"; the base prospectus relating to the Senior Notes and certain other securities of the Company, in the form in which it has most recently been filed with the Commission on or prior to the date of this Agreement relating to the Senior Notes, being hereinafter called the "Base Prospectus"; the Base Prospectus as amended and supplemented by a preliminary prospectus supplement dated September 16, 2025 relating to the Senior Notes which has been filed with the Commission pursuant to Rule 424(b) under the 1933 Act, as it may be further amended and supplemented immediately prior to the Applicable Time (as hereinafter defined) is hereinafter called the "Pricing Prospectus"; the Base Prospectus as amended or supplemented in final form, including by a prospectus supplement relating to the Senior Notes in the form in which it is filed with the Commission, pursuant to Rule 424(b) under the 1933 Act in accordance with Section 4(e) hereof is hereinafter called the "Final Supplemented Prospectus"; any reference herein to any Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus or the Final Supplemented Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the 1933 Act, as of the date of such Preliminary Prospectus, Base Prospectus, Pricing Prospectus or Final Supplemented Prospectus, as the case may be; any reference to any amendment or supplement to any Preliminary

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Prospectus, the Base Prospectus, the Pricing Prospectus or the Final Supplemented Prospectus shall be deemed to refer to and include any documents filed after the date of such Preliminary Prospectus, Base Prospectus, Pricing Prospectus or Final Supplemented 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, Base Prospectus, Pricing Prospectus or Final Supplemented Prospectus, as the case may be; 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 "Applicable Time" is 5:15 P.M. (New York time) on the date of this Agreement; the documents listed in Schedule II-A, taken together and attached hereto, are collectively referred to as the "Pricing Disclosure Package." The term "Limited Use Free Writing Prospectus" shall mean any "written communication" (as defined by Rule 405 under the 1933 Act) in addition to the Pricing Disclosure Package the use of which has been consented to by the Company and the Representatives as listed in Schedule II-B hereto, including any recorded road show.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The documents incorporated by reference in the Registration Statement or the Pricing Prospectus, when they were filed with the Commission, complied in all material respects with the applicable provisions of the 1934 Act and the rules and regulations of the Commission thereunder and, as of such time of filing, when read together with the Pricing Prospectus and any Permitted Free Writing Prospectus (as defined in Section 3(a) hereof), none of such documents 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, in light of the circumstances under which they were made, not misleading; and any further documents so filed and incorporated by reference in the Final Supplemented Prospectus or any further amendment or supplement thereto, when such documents are filed with the Commission, will comply in all material respects with the applicable provisions of the 1934 Act and the rules and regulations of the Commission thereunder and, when read together with the Final Supplemented Prospectus as it otherwise may be amended or supplemented, 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 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: (A) any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use in the Pricing Prospectus, any Permitted Free Writing Prospectus and the Final Supplemented Prospectus; or (B) any information set forth in the Pricing Prospectus or the Final Supplemented Prospectus under the captions "Description of the Series 2025A Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company" and "Description of the Series 2025A Senior Notes ─ Global Clearance and Settlement Procedures."

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Registration Statement and the Final Supplemented Prospectus comply, and any further amendments or supplements thereto, when any such amendments become effective or supplements are filed with the Commission, as the case may be, will comply, in all material respects with the applicable provisions of the 1933 Act, the 1934 Act, the 1939 Act (as hereinafter defined) and the General Rules and Regulations of the Commission thereunder and the

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Registration Statement, the Pricing Disclosure Package and the Final Supplemented Prospectus do not and will not, (i) as of the Effective Date as to the Registration Statement and any amendment thereto, (ii) as of the Applicable Time as to the Pricing Disclosure Package and (iii) as of the date of the Final Supplemented Prospectus as to the Final Supplemented Prospectus or as of the date when any supplement is filed as to the Final Supplemented Prospectus as further supplemented or as of the Closing Date (as hereinafter defined) as to the Final Supplemented Prospectus or the Final Supplemented Prospectus as it may be further supplemented as provided above, contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein not misleading in the case of the Registration Statement and any amendment thereto, and, in light of the circumstances under which they were made, not misleading in the case of the Pricing Disclosure Package and the Final Supplemented Prospectus as further supplemented; except that the Company makes no warranties or representations with respect to (A) that part of the Registration Statement which shall constitute the Statement of Eligibility (Form T-1) under the Trust Indenture Act of 1939, as amended (the "1939 Act"), (B) any statements or omissions made in a Permitted Free Writing Prospectus, the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein or (C) any information set forth in the Pricing Prospectus or the Final Supplemented Prospectus under the captions "Description of the Series 2025A Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company" and "Description of the Series 2025A Senior Notes ─ Global Clearance and Settlement Procedures."

&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)&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;Each Permitted Free Writing Prospectus listed on Schedule II-A hereto does not include anything that conflicts with the information contained in the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus and each such Permitted Free Writing Prospectus, as supplemented by and taken together with the Pricing Disclosure Package as of the Applicable Time, did not contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in 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 statement or omissions made in a Permitted Free Writing Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein.

&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;(ii)&nbsp;&nbsp;&nbsp;&nbsp;Each Limited Use Free Writing Prospectus listed on Schedule II-B hereto does not include anything that conflicts with the information contained in the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus and each Limited Use Free Writing Prospectus, as supplemented by and taken together with the Pricing Disclosure Package as of the Applicable Time, did not contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in 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 a Limited Use Free Writing Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein.

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&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)&nbsp;&nbsp;&nbsp;&nbsp;With respect to the Registration Statement, the conditions for use of Form S-3, as set forth in the General Instructions thereof, have been satisfied.

&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)&nbsp;&nbsp;&nbsp;&nbsp;At the determination date for purposes of the Senior Notes within the meaning of Rule 164(h) under the 1933 Act, the Company was not an "ineligible issuer" as defined in Rule 405 under the 1933 Act.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Since the respective dates as of which information is given in the Registration Statement and the Pricing Prospectus, except as otherwise stated therein, there has been no material adverse change in the business, properties or financial condition of the Company, whether or not arising in the ordinary course of business.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company is a corporation duly organized and existing under the laws of the State of Delaware and has due corporate authority to conduct its business and to own and operate the properties used by it in such business, to enter into and perform its obligations under this Agreement and the Indenture and to issue and sell the Senior Notes to the Underwriters.

&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)&nbsp;&nbsp;&nbsp;&nbsp;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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j)&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized by the Company and, on the Closing Date, will have been duly executed and delivered by the Company, and, assuming the due authorization, execution and delivery of the Indenture by the Trustee, the Indenture will, on the Closing Date, constitute a valid and legally binding obligation of the Company, enforceable against the Company in accordance with its terms, except to the extent that enforcement thereof may be limited by (1) bankruptcy, insolvency, reorganization, receivership, liquidation, fraudulent conveyance, moratorium or other similar laws affecting creditors' rights generally or (2) general principles of equity (regardless of whether enforcement is considered in a proceeding at law or in equity) (the "Enforceability Exceptions"); the Indenture will conform in all material respects to all statements relating thereto contained in the Pricing Disclosure Package and the Final Supplemented Prospectus; and, on the Closing Date, the Indenture will have been duly qualified under the 1939 Act.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k)&nbsp;&nbsp;&nbsp;&nbsp;The issuance and delivery of the Senior Notes have been duly authorized by the Company and, on the Closing Date, the Senior Notes will have been duly executed by the Company and, when authenticated in the manner provided for in the Indenture and delivered against payment therefor as described in this Agreement, will constitute valid and legally binding obligations of the Company, enforceable against the Company in accordance with their terms, except to the extent that enforcement thereof may be limited by the Enforceability Exceptions, will be in the form contemplated by, and entitled to the benefits of, the Indenture and will conform in all material respects to all statements relating thereto in the Registration Statement, the Pricing Disclosure Package and the Final Supplemented Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l)&nbsp;&nbsp;&nbsp;&nbsp;The execution, delivery and performance by the Company of this Agreement, the Indenture and the Senior Notes and the consummation by the Company of the transactions contemplated herein and therein and compliance by the Company with its obligations hereunder and thereunder shall have been duly authorized by all necessary corporate action on the

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part of the Company and do not and will not result in any violation of the Certificate of Incorporation or By-Laws of the Company, and do not and will not conflict with, or result in a breach of any of the terms or provisions of, or constitute a default under, or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company under (A) any contract, indenture, mortgage, loan agreement, note, lease or other agreement or instrument to which the Company is a party or by which it may be bound or to which any of its properties may be subject (except for conflicts, breaches or defaults which would not, individually or in the aggregate, be materially adverse to the Company or materially adverse to the transactions contemplated by this Agreement), or (B) any existing applicable law, rule, regulation, judgment, order or decree of any government, governmental instrumentality or court, domestic or foreign, or any regulatory body or administrative agency or other governmental body having jurisdiction over the Company or any of its properties.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(m)&nbsp;&nbsp;&nbsp;&nbsp;No authorization, approval, consent or order of any court or governmental authority or agency is necessary in connection with the issuance and sale by the Company of the Senior Notes or the transactions by the Company contemplated in this Agreement, except (A) such as may be required under the 1933 Act or the rules and regulations thereunder; (B) such as may be required under the Federal Power Act; (C) such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or "blue sky" laws and (D) the qualification of the Indenture under the 1939 Act.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(n)&nbsp;&nbsp;&nbsp;&nbsp;The financial statements of the Company incorporated by reference in the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, together with the related schedules and notes, present fairly, in all material respects, the financial position, results of operations and cash flows of the Company as of and for the dates indicated; said financial statements have been prepared in conformity with accounting principles generally accepted in the United States ("GAAP") applied on a consistent basis (except that the unaudited financial statements incorporated by reference in the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus may be subject to normal year-end adjustments) throughout the periods involved and necessarily include amounts that are based on the best estimates and judgments of management. The selected financial data and the summary financial information included in the Pricing Prospectus and the Final Supplemented Prospectus present fairly the information shown therein and have been compiled on a basis consistent with that of the audited and unaudited financial statements of the Company incorporated by reference in the Registration Statement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(o)&nbsp;&nbsp;&nbsp;&nbsp;Neither the Company nor, to the knowledge of the Company, any director, officer, agent, employee or subsidiary of the Company is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department ("OFAC"); and the Company will not directly or indirectly use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity, for the purpose of financing the activities of any person that, at the time of such financing, is subject to any U.S. sanctions administered by OFAC.

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SECTION 2.&nbsp;&nbsp;&nbsp;&nbsp;<u>SALE AND DELIVERY TO THE UNDERWRITERS; CLOSING; SELLING RESTRICTIONS</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;On the basis of the representations and warranties herein contained and subject to the terms and conditions herein set forth, the Company agrees to sell to each Underwriter, severally and not jointly, and each Underwriter, severally and not jointly, agrees to purchase from the Company, the principal amount of Senior Notes set forth in Schedule I to this Agreement opposite the name of such Underwriter (plus any additional amount of Senior Notes that such Underwriter may become obligated to purchase pursuant to the provisions of Section 11 hereof), at a price equal to 99.210% of the principal amount thereof.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Payment of the purchase price and delivery of the certificate(s) for the Senior Notes shall be made at the offices of Southern Company Services, Inc., 30 Ivan Allen Jr. Blvd., NW, Atlanta, Georgia 30308 at 10:00 A.M., New York time, on September 19, 2025 (unless postponed in accordance with the provisions of Section 11 hereof) or such other time, place or date as shall be agreed upon by the Representatives and the Company (such time and date of payment and delivery being herein called the "Closing Date"). Payment shall be made to the Company by wire transfer in federal funds at the Closing Date against delivery of the Senior Notes to Mizuho Securities USA LLC on behalf of all of the Underwriters. It is understood that each Underwriter has authorized Mizuho Securities USA LLC, for each Underwriter's account, to accept delivery of, receipt for, and make payment of, the principal amount of the Senior Notes which each Underwriter has agreed to purchase. Mizuho Securities USA LLC, individually and not as a representative of the Underwriters, may (but shall not be obligated to) make payment of the principal amount of the Senior Notes to be purchased by any Underwriter whose payment has not been received by the Closing Date, but such payment shall not relieve such Underwriter from its obligations hereunder.

The delivery of the Senior Notes shall be made in fully registered form, registered in the name of CEDE & CO., to the offices of The Depository Trust Company in New York, New York or its designee, and the Representatives shall accept such delivery.

The certificate(s) for the Senior Notes will be made available for examination by the Representatives not later than 12:00 Noon, New York time, on the last business day prior to the Closing Date.

&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)&nbsp;&nbsp;&nbsp;&nbsp;(i) Each Underwriter will not offer, sell or deliver any of the Senior Notes, directly or indirectly, or distribute the Pricing Prospectus, the Final Supplemented Prospectus or any other offering material relating to the Senior Notes, in or from any jurisdiction except under circumstances that will, to the best of such Underwriter's knowledge and belief, result in compliance with the applicable laws and regulations and which will not impose any obligations on the Company except as set forth in this Agreement.

&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) Each Underwriter will sell the Senior Notes in Canada only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 *Prospectus Exemptions* or subsection 73.3(1) of the *Securities Act* (Ontario), and are permitted clients, as defined in National Instrument 31-103 *Registration Requirements, Exemptions and Ongoing Registrant Obligations*.

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&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) In relation to each member state of the European Economic Area ("EEA"), each Underwriter has not offered, sold or otherwise made available and will not offer, sell or otherwise make available to any retail investor in the EEA, the Senior Notes.

For the purposes of paragraph (iii), a retail investor means a person who is one (or more) of: (i) a retail client as defined in point (11) of Article 4(1) of Directive 2014/65/EU (as amended, "MiFID II"); or (ii) a customer within the meaning of Directive (EU) 2016/97, as amended, where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or (iii) not a qualified investor as defined in Regulation (EU) 2017/1129 (as amended).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) In relation to the United Kingdom ("UK"), each Underwriter has not offered, sold or otherwise made available and will not offer, sell or otherwise make available to any retail investor in the UK any of the Senior Notes.

For the purposes of paragraph (iv), a "retail investor" means a person who is one (or more) of the following: (i) a retail client, as defined in point (8) of Article 2 of Regulation (EU) No 2017/565 as it forms part of domestic law by virtue of the European Union (Withdrawal) Act 2018 (as amended, the "EUWA"); (ii) a customer within the meaning of the provisions of the Financial Services and Markets Act 2000 (as amended, the "FSMA") and any rules or regulations made under the FSMA to implement Directive (EU) 2016/97, where that customer would not qualify as a professional client, as defined in point (8) of Article 2(1) of Regulation (EU) No 600/2014 as it forms part of domestic law by virtue of the EUWA; or (iii) not a qualified investor as defined in Article 2 of Regulation (EU) 2017/1129 as it forms part of domestic law by virtue of the EUWA.

Each Underwriter (A) has only communicated or caused to be communicated and will only communicate or cause to be communicated any invitation or inducement to engage in investment activity (within the meaning of Section 21 of the FSMA) received by it in connection with the issue or sale of the Senior Notes in circumstances in which Section 21(1) of the FSMA does not apply to the Company; and (B) has complied and will comply with all applicable provisions of the FSMA with respect to anything done by it in relation to the Senior Notes in, from or otherwise involving the UK.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) Each Underwriter will not offer or sell any Senior Notes, directly or indirectly, in Japan or to, or for the account or benefit of, any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan), or to, or for the account or benefit of, others for re-offering or resale, directly or indirectly, in Japan or to, or for the account or benefit of, any resident of Japan, except pursuant to an exemption from the registration requirements of, and otherwise in compliance with, the Financial Instruments and Exchange Law (Act No. 25 of 1948, as amended) and any other applicable laws, regulations and ministerial guidelines of Japan in effect at the relevant time.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) Each Underwriter represents and agrees that the Senior Notes may not be offered, sold or delivered, directly or indirectly, in the Republic of Korea or to, or for the account or benefit of, any resident of the Republic of Korea (as defined in the Foreign Exchange

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Transactions Law of the Republic of Korea and its Enforcement Decree) or to others for re-offering or resale, except as otherwise permitted by applicable Korean laws and regulations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vii) Each Underwriter agrees that, in connection with the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the Senior Notes, the Senior Notes may not be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an institutional investor as defined in Section 4A of the Securities and Futures Act, 2001 of Singapore, as modified or amended from time to time (the "SFA"), pursuant to Section 274 of the SFA, (ii) to a relevant person (as defined in Section 275(2) of the SFA) pursuant to Section 275(1) of the SFA, or any person pursuant to Section 275(1A) of the SFA, and in accordance with the conditions specified in Section 275 of the SFA, and (where applicable) Regulation 3 of the Securities and Futures (Classes of Investors) Regulations 2018 of Singapore, or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(viii) Each Underwriter will not publicly distribute or otherwise make publicly available in Switzerland the Preliminary Prospectus, the Final Supplemented Prospectus or any other offering or marketing material relating to the Senior Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ix) Each Underwriter has not registered and will not register the Senior Notes with the Financial Supervisory Commission of Taiwan, the Republic of China ("Taiwan") pursuant to relevant securities laws and regulations. Each Underwriter represents and agrees that (A) the Senior Notes may not be sold, issued or offered within Taiwan through a public offering or in circumstances which constitutes an offer within the meaning of the Securities and Exchange Act of Taiwan or relevant laws and regulations that require a registration, filing or approval of the Financial Supervisory Commission of Taiwan and (B) no person or entity in Taiwan has been authorized to offer, sell, give advice regarding or otherwise intermediate the offering and sale of the Senior Notes in Taiwan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x) Each Underwriter has not publicly offered, sold, promoted or advertised the Senior Notes, and will not publicly offer, sell, promote or advertise the Senior Notes, in the United Arab Emirates (the "UAE") (including the Dubai International Financial Centre) other than in compliance with the laws of the UAE (and the Dubai International Financial Centre) governing the issue, offering and sale of securities.

SECTION 3.&nbsp;&nbsp;&nbsp;&nbsp;<u>FREE WRITING PROSPECTUSES</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company represents and agrees that, without the prior consent of the Representatives, it has not made and will not make any offer relating to the Senior Notes that would constitute a "free writing prospectus" as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus and a Limited Use Free Writing Prospectus; each Underwriter, severally and not jointly, represents and agrees that, without the prior consent of the Company and the Representatives, it has not made and will not make any offer relating to the Senior Notes that would constitute a "free writing prospectus" as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus, a Limited Use Free Writing Prospectus or a free writing prospectus that is not required to be filed by the Company pursuant to Rule 433

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under the 1933 Act or one or more free writing prospectuses through customary Bloomberg distribution that do not contain substantive changes from or additions to the information contained in the free writing prospectus, dated the date hereof, filed pursuant to Rule 433(d) under the 1933 Act relating to the Senior Notes (the "Pricing Term Sheet"); any such free writing prospectus (which shall include the Pricing Term Sheet but shall not include a Limited Use Free Writing Prospectus), the use of which has been consented to by the Company and the Representatives, is listed on Schedule II-A hereto and herein called a "Permitted Free Writing Prospectus."

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company agrees to prepare the Pricing Term Sheet, which shall be previously approved by the Representatives, and to file the Pricing Term Sheet pursuant to Rule 433(d) under the 1933 Act within the time period prescribed by such Rule.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Underwriters have complied and will comply with the requirements of Rule 433 under the 1933 Act applicable to any free writing prospectus, including timely Commission filing where required and legending.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company agrees that if at any time following issuance of a Permitted Free Writing Prospectus or a Limited Use Free Writing Prospectus any event occurred or occurs as a result of which such Permitted Free Writing Prospectus or such Limited Use Free Writing Prospectus would conflict with the information in the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus or include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in light of the circumstances then prevailing, not misleading, the Company will give prompt notice thereof to the Representatives and, if requested by the Representatives, 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 Representatives, which will correct such conflict, statement or omission; provided, however, that this representation and warranty shall not apply to any statements or omissions in a Permitted Free Writing Prospectus or a Limited Use Free Writing Prospectus made in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company agrees that if there occurs an event or development as a result of which the Pricing Disclosure Package 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 light of the circumstances then prevailing, not misleading, the Company will notify the Representatives so that any use of the Pricing Disclosure Package may cease until it is amended or supplemented.

SECTION 4.&nbsp;&nbsp;&nbsp;&nbsp;<u>COVENANTS OF THE COMPANY</u>. The Company covenants with the Underwriters 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)&nbsp;&nbsp;&nbsp;&nbsp;The Company, on or prior to the Closing Date, will deliver to the Underwriters conformed copies of the Registration Statement as originally filed and of all amendments thereto, heretofore or hereafter made, including any post-effective amendment (in each case including all exhibits filed therewith, and including unsigned copies of each consent and certificate included therein or filed as an exhibit thereto, except exhibits incorporated by reference, unless specifically requested). As soon as the Company is advised thereof, it will advise the Representatives orally of the issuance of any stop order under the 1933 Act with respect to the

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Registration Statement, or the institution of any proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or related to the offering, of which the Company shall have received notice, and will use its best efforts to prevent the issuance of any such stop order and to secure the prompt removal thereof, if issued. The Company will deliver to the Representatives sufficient conformed copies of the Registration Statement, the Base Prospectus, the Pricing Prospectus and the Final Supplemented Prospectus and of all supplements and amendments thereto (in each case without exhibits) for distribution to the Underwriters and, from time to time, as many copies of the Base Prospectus, the Pricing Prospectus and the Final Supplemented Prospectus as the Underwriters may reasonably request for the purposes contemplated by the 1933 Act or the 1934 Act.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company will furnish the Underwriters with written or electronic copies of each amendment and supplement to the Final Supplemented Prospectus relating to the offering of the Senior Notes in such quantities as the Underwriters may from time to time reasonably request. If, during the period (not exceeding nine months) when the delivery of a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) shall be required by law in connection with the sale of any Senior Notes by an Underwriter, any event relating to or affecting the Company, or of which the Company shall be advised in writing by the Representatives, shall occur, which in the opinion of the Company or of Underwriters' counsel should be set forth in a supplement to or an amendment of the Final Supplemented Prospectus, as the case may be, in order to make the Final Supplemented Prospectus not misleading in light of the circumstances when it (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) is delivered, or if for any other reason it shall be necessary during such period to amend or supplement the Final Supplemented Prospectus or to file under the 1934 Act any document incorporated by reference in the Final Supplemented Prospectus in order to comply with the 1933 Act or the 1934 Act, the Company forthwith will (i) notify the Underwriters to suspend solicitation of purchases of the Senior Notes and (ii) at its expense, make any such filing or prepare and furnish to the Underwriters a reasonable number of copies of a supplement or supplements or an amendment or amendments to the Final Supplemented Prospectus which will supplement or amend the Final Supplemented Prospectus so that, as supplemented or amended, it will not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in light of the circumstances when the Final Supplemented Prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) is delivered, not misleading or which will effect any other necessary compliance. In case any Underwriter is required to deliver a prospectus in connection with the sale of any Senior Notes after the expiration of the period specified in the preceding sentence, the Company, upon the request of such Underwriter, will furnish to such Underwriter, at the expense of such Underwriter, a reasonable quantity of a supplemented or amended prospectus, or supplements or amendments to the Final Supplemented Prospectus, complying with Section 10(a) of the 1933 Act. During the period specified in the second sentence of this subsection, the Company will continue to prepare and file with the Commission on a timely basis all documents or amendments required under the 1934 Act and the rules and regulations thereunder; provided, that the Company shall not file such documents or amendments without also furnishing copies thereof prior to such filing to the Representatives and Hunton Andrews Kurth LLP.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company will endeavor, in cooperation with the Underwriters, to qualify the Senior Notes for offering and sale under the applicable securities laws of such states

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and the other jurisdictions of the United States as the Representatives may designate; <u>provided</u>, <u>however</u>, that the Company shall not be obligated to qualify as a foreign corporation in any jurisdiction in which it is not so qualified or to file a consent to service of process or to file annual reports or to comply with any other requirements in connection with such qualification deemed by the Company to be unduly burdensome.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company will make generally available to its security holders as soon as practicable but not later than 45 days after the close of the period covered thereby, an earnings statement of the Company (in form complying with the provisions of Rule 158 of the rules and regulations under the 1933 Act) covering a twelve-month period beginning not later than the first day of the Company's fiscal quarter next following the "effective date" (as defined in Rule 158) of the Registration Statement.

&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)&nbsp;&nbsp;&nbsp;&nbsp;As soon as practicable after the date of this Agreement, and in any event within the time prescribed by Rule 424 under the 1933 Act, the Company will file the Final Supplemented Prospectus, in a form approved by the Representatives, such approval not to be unreasonably withheld, with the Commission and will advise the Representatives of such filing and will confirm such advice in writing. Furthermore, the Company will make any other required filings pursuant to Rule 433(d)(1) under the 1933 Act within the time required by such Rule.

&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)&nbsp;&nbsp;&nbsp;&nbsp;During a period of 15 days from the date of this Agreement, the Company will not, without the Representatives' prior written consent, directly or indirectly, sell, offer to sell, grant any option for the sale of, or otherwise dispose of, any Senior Notes or any security convertible into or exchangeable into or exercisable for the Senior Notes or any debt securities substantially similar to the Senior Notes (except for the Senior Notes issued pursuant to this Agreement and the Company's proposed issuance of the Series 2025B Senior Notes). The Representatives agree that commercial paper or other debt securities with scheduled maturities of less than one year are not subject to this Section 4(f).

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company shall use the net proceeds received by it from the sale of the Senior Notes pursuant to this Agreement in the manner specified in the Pricing Prospectus under the caption "Use of Proceeds."

SECTION 5.&nbsp;&nbsp;&nbsp;&nbsp;<u>PAYMENT OF EXPENSES</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company will pay all expenses incidental to the performance of its obligations under this Agreement, including, but not limited to, the expenses of (i) the printing and filing of the Registration Statement as originally filed and of each amendment thereto, (ii) the preparation, issuance and delivery of the certificate(s) for the Senior Notes, (iii) the fees and disbursements of the Company's counsel and accountants, (iv) the qualification of the Senior Notes under securities laws in accordance with the provisions of Section 4(c) hereof, including filing fees and the reasonable fees and disbursements of Hunton Andrews Kurth LLP, counsel for the Underwriters, in connection therewith and in connection with the preparation of any blue sky survey (such fees and disbursements of counsel shall not exceed $3,500), (v) the printing and delivery to the Underwriters of copies of the Registration Statement as originally filed and of each amendment thereto and of the Pricing Prospectus, any Permitted Free Writing Prospectus, the Final Supplemented Prospectus and any amendments or supplements thereto, (vi) the printing and

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delivery to the Underwriters of copies of any blue sky survey, (vii) the fee of the Financial Industry Regulatory Authority, Inc. in connection with its review of the offering contemplated by this Agreement, if applicable, (viii) the fees and expenses of the Trustee, including the fees and disbursements of counsel for the Trustee in connection with the Indenture and the Senior Notes, (ix) any fees payable in connection with the rating of the Senior Notes, (x) the cost and charges of any transfer agent or registrar and (xi) the cost of qualifying the Senior Notes with The Depository Trust Company.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Except as otherwise provided in Section 10 hereof, the Underwriters shall pay all other expenses incurred by them in connection with their offering of the Senior Notes, including fees and disbursements of their counsel, Hunton Andrews Kurth LLP.

SECTION 6.&nbsp;&nbsp;&nbsp;&nbsp;<u>CONDITIONS OF UNDERWRITERS' OBLIGATIONS</u>. The obligations of the Underwriters to purchase and pay for the Senior Notes are subject to the following conditions:

&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)&nbsp;&nbsp;&nbsp;&nbsp;No stop order suspending the effectiveness of the Registration Statement shall be in effect on the Closing Date and no proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or related to the offering shall be pending before, or to the knowledge of the Company threatened by, the Commission on such date. If filing of the Pricing Prospectus or the Final Supplemented Prospectus, or any supplement thereto, is required pursuant to Rule 424, the Pricing Prospectus and the Final Supplemented Prospectus, and any such supplement, as applicable, shall have been filed in the manner and within the time period required by Rule 424. The pricing term sheet contemplated by Section 3(b) hereof, and any other material required to be filed by the Company pursuant to Rule 433(d) under the 1933 Act, shall have been filed by the Company with the Commission within the applicable time periods prescribed for such filings by Rule 433.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Any required orders of any applicable state commission or the Federal Energy Regulatory Commission permitting the transactions contemplated hereby substantially in accordance with the terms and conditions hereof shall be in full force and effect and shall contain no provision unacceptable to the Underwriters or the Company (but all provisions of such order or orders heretofore entered, copies of which have heretofore been delivered to the Representatives, are deemed acceptable to the Underwriters and the Company and all provisions of such order or orders hereafter entered shall be deemed acceptable to the Underwriters and the Company unless within 24 hours after receiving a copy of any such order any party to this Agreement shall give notice to the other parties to the effect that such order contains an unacceptable provision).

&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)&nbsp;&nbsp;&nbsp;&nbsp;On the Closing Date, the Representatives shall have received:

&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;(1)&nbsp;&nbsp;&nbsp;&nbsp;The opinion and related disclosure letter, each dated the Closing Date, of Troutman Pepper Locke LLP, counsel for the Company, substantially in the forms attached hereto as Schedule III.

&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;(2)&nbsp;&nbsp;&nbsp;&nbsp;The opinion, dated the Closing Date, of Emmet, Marvin & Martin, LLP, counsel to the Trustee, substantially in the form attached hereto as Schedule IV.

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&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;(3)&nbsp;&nbsp;&nbsp;&nbsp;The opinion and related disclosure letter, each dated the Closing Date, of Hunton Andrews Kurth LLP, counsel for the Underwriters, substantially in the forms attached hereto as Schedule V.

&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)&nbsp;&nbsp;&nbsp;&nbsp;At the Closing Date, there shall not have been, since the date hereof or since the respective dates as of which information is given in the Registration Statement and the Final Supplemented Prospectus, any material adverse change in the business, properties or financial condition of the Company, whether or not arising in the ordinary course of business, and the Representatives shall have received a certificate of the President or any Vice President of the Company, and dated as of the Closing Date, to the effect that (i) there has been no such material adverse change, (ii) the representations and warranties in Section 1 hereof are true and correct with the same force and effect as though expressly made at and as of the Closing Date, (iii) the Company has complied with all agreements and satisfied all conditions on its part to be performed or satisfied on or prior to the Closing Date and (iv) no stop order suspending the effectiveness of the Registration Statement has been issued and no proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or related to the offering have been initiated or, to the knowledge of the Company, threatened by the Commission.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Representatives shall have received on the date hereof and shall receive on the Closing Date from Deloitte & Touche LLP, a letter or letters addressed to the Representatives (which may refer to letters previously delivered to the Representatives) dated the respective dates of delivery thereof to the effect that: (A) they are an independent registered public accounting firm with respect to the Company within the meaning of the 1933 Act and the rules and regulations under the 1933 Act; (B) in their opinion, the financial statements audited by them and incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, comply as to form in all material respects with the applicable accounting requirements of the 1934 Act and the rules and regulations under the 1934 Act; and (C) on the basis of certain limited procedures performed through a specified date not more than three business days prior to the date of such letter, namely (i) reading the minute books of the Company; (ii) performing the procedures specified by the standards of the Public Company Accounting Oversight Board (United States) for a review of interim financial statement information as described in PCAOB AS 4105, "Reviews of Interim Financial Information" on the unaudited financial statements, if any, of the Company incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, and on the latest available unaudited financial statements of the Company, if any, for any calendar quarter subsequent to the date of those incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable; and (iii) making inquiries of certain officials of the Company who have responsibility for financial and accounting matters regarding such unaudited financial statements or any specified unaudited amounts derived therefrom (it being understood that the foregoing procedures do not constitute an audit performed in accordance with generally accepted auditing standards and they would not necessarily reveal matters of significance with respect to the comments made in such letter, and accordingly that Deloitte & Touche LLP make no representations as to the sufficiency of such procedures for the Underwriters' purposes), nothing came to their attention that caused them to believe that: (1) any material modifications should be made to the unaudited condensed financial statements, if any, incorporated by reference

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in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, for them to be in conformity with GAAP; (2) such unaudited condensed financial statements do not comply as to form in all material respects with the applicable accounting requirements of the 1934 Act as it applies to Form 10-Q and the related published rules and regulations thereunder; (3) the audited or unaudited amounts for Operating Revenues, Earnings Before Income Taxes and Net Income Attributable to Southern Power Company set forth in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, do not agree with the amounts set forth in or derived from the audited or unaudited financial statements of the Company for the same period included or incorporated by reference in the Registration Statement; (4) as of a specified date not more than three business days prior to the date of delivery of such letter, there has been any change in the capital stock or long-term debt of the Company or any decrease in net assets of the Company as compared with amounts shown in the latest audited or unaudited balance sheet incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, except in each case for changes or decreases which (i) the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, disclose, have occurred or may occur, (ii) are occasioned by the declaration of dividends, (iii) are occasioned by draw-downs and regularly scheduled payments of capitalized lease obligations, (iv) are occasioned by the purchase or redemption of bonds or stock to satisfy mandatory or optional redemption provisions relating thereto, (v) are occasioned by the reclassification of current maturities of long-term debt, (vi) are occasioned by the amortization of debt issuance costs, or (vii) are disclosed in such letter; and (5) the unaudited amounts for Operating Revenues, Earnings Before Income Taxes and Net Income Attributable to Southern Power Company for any calendar quarter subsequent to those set forth in (3) above, which, if available, shall be set forth in such letter, do not agree with the amounts set forth in or derived from the unaudited financial statements of the Company for the same period or were not determined on a basis substantially consistent with that of the corresponding audited amounts included or incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable.

&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)&nbsp;&nbsp;&nbsp;&nbsp;On the Closing Date, Hunton Andrews Kurth LLP, counsel for the Underwriters, shall have been furnished with such documents and opinions as it may reasonably require for the purpose of enabling it to pass upon the issuance and sale of the Senior Notes as herein contemplated and related proceedings, or in order to evidence the accuracy of any of the representations or warranties, or the fulfillment of any of the conditions, herein contained; and all proceedings taken by the Company in connection with the issuance and sale of the Senior Notes as herein contemplated shall be satisfactory in form and substance to the Representatives and Hunton Andrews Kurth LLP, counsel for the Underwriters.

&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)&nbsp;&nbsp;&nbsp;&nbsp;No amendment or supplement to the Registration Statement or the Final Supplemented Prospectus filed subsequent to the date of this Agreement (including any filing made by the Company pursuant to Section 13 or 14 of the 1934 Act) shall be unsatisfactory in form to Hunton Andrews Kurth LLP or shall contain information (other than with respect to an amendment or supplement relating solely to the activity of any Underwriter) which, in the

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reasonable judgment of the Representatives, shall materially impair the marketability of the Senior Notes.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company shall have performed its obligations when and as provided under this Agreement.

If any condition specified in this Section shall not have been fulfilled when and as required to be fulfilled, this Agreement may be terminated by the Representatives by notice to the Company at any time prior to the Closing Date, and such termination shall be without liability of any party to any other party except as provided in Sections 5, 8 and 10(b) hereof.

SECTION 7.&nbsp;&nbsp;&nbsp;&nbsp;<u>CONDITIONS OF THE OBLIGATIONS OF THE COMPANY</u>.

The obligations of the Company shall be subject to the conditions set forth in the first sentence of Section 6(a) and in Section 6(b) hereof. In case such conditions shall not have been fulfilled, this Agreement may be terminated by the Company by mailing or delivering written notice thereof to the Representatives. Any such termination shall be without liability of any party to any other party except as otherwise provided in Sections 5, 8 and 10(b) hereof.

SECTION 8.&nbsp;&nbsp;&nbsp;&nbsp;<u>INDEMNIFICATION</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company agrees to indemnify and hold harmless each of the Underwriters and each person, if any, who controls any such Underwriter within the meaning of Section 15 of the 1933 Act or Section 20(a) of the 1934 Act, against any and all losses, claims, damages or liabilities, joint or several, to which they or any of them may become subject under the 1933 Act, the 1934 Act or otherwise, and to reimburse any such Underwriter and such controlling person or persons, if any, for any legal or other expenses incurred by them in connection with defending any actions, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in a Limited Use Free Writing Prospectus, any Preliminary Prospectus, the Registration Statement, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus or the Final Supplemented Prospectus or, if the Company shall furnish to the Underwriters any amendments or any supplements thereto, or shall make any filings pursuant to Section 13 or 14 of the 1934 Act which are incorporated therein by reference, in a Limited Use Free Writing Prospectus, any Preliminary Prospectus, the Registration Statement, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus, the Final Supplemented Prospectus as so amended or supplemented, or in any free writing prospectus used by the Company other than a Permitted Free Writing Prospectus or a Limited Use Free Writing Prospectus, or arise out of or are based upon any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any such untrue statement or alleged untrue statement or omission or alleged omission which was made in such Limited Use Free Writing Prospectus, Preliminary Prospectus, Registration Statement, Base Prospectus, Pricing Prospectus, Permitted Free Writing Prospectus or Final Supplemented Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives for use therein. Each Underwriter agrees, within ten days after the receipt by it of notice of the commencement of any

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action in respect of which indemnity may be sought by it, or by any person controlling it, from the Company on account of its agreement contained in this Section 8, to notify the Company in writing of the commencement thereof but the omission of such Underwriter so to notify the Company of any such action shall not release the Company from any liability which it may have to such Underwriter or to such controlling person otherwise than on account of the indemnity agreement contained in this Section 8. In case any such action shall be brought against an Underwriter or any such person controlling such Underwriter and such Underwriter shall notify the Company of the commencement thereof as above provided, the Company shall be entitled to participate in (and, to the extent that it shall wish, including the selection of counsel, to direct) the defense thereof, at its own expense. In case the Company elects to direct such defense and select such counsel, any Underwriter or controlling person shall have the right to employ its own counsel, but, in any such case, the fees and expenses of such counsel shall be at the expense of such Underwriter or such controlling person unless the employment of such counsel has been authorized in writing by the Company in connection with defending such action. No indemnifying party shall, without the written consent of the indemnified party, effect the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim in respect of which indemnification may be sought hereunder (whether or not the indemnified party is an actual or potential party to such action or claim) unless such settlement, compromise or judgment (i) includes an unconditional release of the indemnified party from all liability arising out of such action or claim and (ii) does not include any statement as to, or an admission of, fault, culpability or a failure to act, by or on behalf of any indemnified party. In no event shall any indemnifying party have any liability or responsibility in respect of the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim effected without its prior written consent.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter, severally and not jointly, agrees to indemnify and hold harmless the Company, its directors and such of its officers who have signed the Registration Statement and each person, if any, who controls the Company within the meaning of Section 15 of the 1933 Act or Section 20(a) of the 1934 Act to the same extent and upon the same terms as the indemnity agreement of the Company set forth in Section 8(a) hereof, but only with respect to alleged untrue statements or omissions made in a Limited Use Free Writing Prospectus, the Registration Statement, the Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus or the Final Supplemented Prospectus, or such documents as amended or supplemented, in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives for use therein.

SECTION 9.&nbsp;&nbsp;&nbsp;&nbsp;<u>REPRESENTATIONS, WARRANTIES AND AGREEMENTS TO SURVIVE DELIVERY</u>.

All representations, warranties and agreements contained in this Agreement, or contained in certificates of officers of the Company submitted pursuant hereto, shall remain operative and in full force and effect, regardless of any investigation made by or on behalf of any Underwriter or controlling person, or by, or on behalf of the Company and shall survive delivery of the Senior Notes to the Underwriters.

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SECTION 10.&nbsp;&nbsp;&nbsp;&nbsp;<u>TERMINATION OF AGREEMENT</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Representatives may terminate this Agreement, by notice to the Company, at any time at or prior to the Closing Date if (i) trading in securities on the New York Stock Exchange shall have been generally suspended or there shall have been a material disruption in settlement in securities generally, (ii) minimum or maximum ranges for prices shall have been generally established on the New York Stock Exchange by the Commission or by the New York Stock Exchange, (iii) a general banking moratorium shall have been declared by federal or New York State authorities, or (iv) there shall have occurred any outbreak or escalation of major hostilities in which the United States is involved, any declaration of war by the United States Congress or any other substantial national or international calamity, crisis or emergency (including, without limitation, acts of terrorism) affecting the United States, in any such case provided for in clauses (i) through (iv) with the result that, in the reasonable judgment of the Representatives, the offering, sale or delivery of the Senior Notes on the terms and in the manner contemplated by this Agreement and the Final Supplemented Prospectus shall have been materially impaired.

&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)&nbsp;&nbsp;&nbsp;&nbsp;If this Agreement shall be terminated by the Representatives pursuant to subsection (a) above or because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement, then in any such case, the Company will reimburse the Underwriters for the reasonable fees and disbursements of Hunton Andrews Kurth LLP and for the out of pocket expenses (in an amount not exceeding $10,000) reasonably incurred by the Underwriters in making preparations for the purchase, sale and delivery of the Senior Notes and, upon such reimbursement, the Company shall be absolved from any further liability hereunder, except as provided in Sections 5 and 8 hereof.

SECTION 11.&nbsp;&nbsp;&nbsp;&nbsp;<u>DEFAULT BY AN UNDERWRITER</u>.

If an Underwriter shall fail on the Closing Date to purchase the Senior Notes that it is obligated to purchase under this Agreement (the "Defaulted Securities"), the Representatives shall have the right, within 24 hours thereafter, to make arrangements for one or more of the non-defaulting Underwriters, or any other underwriters, to purchase all, but not less than all, of the Defaulted Securities in such amounts as may be agreed upon and upon the terms herein set forth. If, however, the Representatives shall not have completed such arrangements within such 24-hour period, then:

&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)&nbsp;&nbsp;&nbsp;&nbsp;if the principal amount of Defaulted Securities does not exceed 10% of the Senior Notes, each of the non-defaulting Underwriters shall be obligated, severally and not jointly, to purchase the full amount thereof in the proportions that their respective underwriting obligations hereunder bear to the underwriting obligations of all non-defaulting Underwriters, 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;(b)&nbsp;&nbsp;&nbsp;&nbsp;if the principal amount of Defaulted Securities exceeds 10% of the Senior Notes, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

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No action taken pursuant to this Section shall relieve any defaulting Underwriter from liability in respect of its default.

In the event of any such default which does not result in a termination of this Agreement, either the Representatives or the Company shall have the right to postpone the Closing Date for a period not exceeding seven days in order to effect any required changes in the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus or in any other documents or arrangements.

SECTION 12.&nbsp;&nbsp;&nbsp;&nbsp;<u>NOTICES</u>. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted by any standard form of telecommunication. Notices to the Underwriters shall be directed to the Representatives at BMO Capital Markets Corp., 151 West 42nd Street, New York, New York 10036, Attention: Legal Department, Fax No.: (212) 702-1205; Mizuho Securities USA LLC, 1271 Avenue of the Americas, New York, New York 10020, Attention: Debt Capital Markets, BA_DCM_Notices@mizuhogroup.com; PNC Capital Markets LLC, 300 Fifth Avenue, 10th Floor, Pittsburgh, Pennsylvania 15222, Attention: Debt Capital Markets, Fixed Income Transaction Execution, capitalmarketsnotices@pnc.com and SMBC Nikko Securities America, Inc., 277 Park Avenue, 5th Floor, New York, New York 10172, Attention: Debt Capital Markets, email NikkoGCNotices@smbcnikko-si.com; notices to the Company shall be mailed to 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308, Attention: Corporate Secretary, with a copy to Southern Company Services, Inc., 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308, Attention: J. Seth Blocker.

SECTION 13.&nbsp;&nbsp;&nbsp;&nbsp;<u>PARTIES</u>. This Agreement shall inure to the benefit of and be binding upon the Underwriters, 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 Underwriters and the Company and their respective successors and the controlling persons and officers and directors referred to in Section 8 and their 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 are intended to be for the sole and exclusive benefit of the Underwriters and the Company and their respective successors, and said controlling persons and officers and directors and their heirs and legal representatives, and for the benefit of no other person, firm or corporation. No purchaser of Senior Notes from any of the Underwriters shall be deemed to be a successor by reason merely of such purchase. The Company acknowledges and agrees that in connection with all aspects of each transaction contemplated by this Agreement, the Company and the Underwriters have arms-length business relationships that create no fiduciary duty on the part of any party and each expressly disclaims any fiduciary or financial advisory relationship.

SECTION 14.&nbsp;&nbsp;&nbsp;&nbsp;<u>GOVERNING LAW AND TIME</u>. This Agreement shall be governed by and construed in accordance with the laws of the State of New York applicable to agreements made and to be performed in said State. Except as otherwise set forth herein, specified times of day refer to New York time.

SECTION 15.&nbsp;&nbsp;&nbsp;&nbsp;<u>COUNTERPARTS</u>. This Agreement may be executed by any one or more of the parties hereto in any number of counterparts by manual, facsimile or electronic

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signature, each of which shall be deemed to be an original, but all such respective counterparts shall together constitute one and the same instrument. The words "execution," "signed," "delivery," and words of like import in or relating to this Agreement or any document to be signed in connection with this Agreement shall be deemed to include electronic signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means.

SECTION 16.&nbsp;&nbsp;&nbsp;&nbsp;<u>RECOGNITION OF THE U.S. SPECIAL RESOLUTION REGIMES.</u>

&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)&nbsp;&nbsp;&nbsp;&nbsp;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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;&nbsp;&nbsp;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.

"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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;&nbsp;&nbsp;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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;&nbsp;&nbsp;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.

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If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument, along with all counterparts, will become a binding agreement among the Underwriters and the Company in accordance with its terms.

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Very truly yours,

SOUTHERN POWER COMPANY

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Jon P. Haygood</u>

Name: Jon P. Haygood

Title: Assistant Treasurer

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CONFIRMED AND ACCEPTED,

as of the date first above written

BMO Capital Markets Corp.

By: <u>/s/ Mark Spadaccini</u>

Name: Mark Spadaccini

Title: Managing Director

Mizuho Securities USA LLC

By: <u>/s/ Stephen E. Leamer</u> 

Name: Stephen E. Leamer

Title: Managing Director

PNC Capital Markets LLC

By: <u>/s/ Valerie Shadeck</u> 

Name: Valerie Shadeck

Title: Managing Director

SMBC Nikko Securities America, Inc.

By: <u>/s/ Amanda Boggs</u>

Name: Amanda Boggs

Title: Managing Director

As Representatives of the Several Underwriters named in Schedule I hereto

[Signature Page to 2025A Underwriting Agreement]

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**SCHEDULE I**

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| | |
|:---|:---|
| | Principal Amount of Series 2025A |
| Name of Underwriters | Senior Notes |
| BMO Capital Markets Corp. | $82500000 |
| Mizuho Securities USA LLC | 82500000 |
| PNC Capital Markets LLC | 82500000 |
| SMBC Nikko Securities America, Inc. | 82500000 |
| Santander US Capital Markets LLC | 38500000 |
| BBVA Securities Inc. | 30250000 |
| BNY Mellon Capital Markets, LLC | 30250000 |
| CIBC World Markets Corp. | 30250000 |
| Huntington Securities, Inc. | 30250000 |
| Intesa Sanpaolo IMI Securities Corp. | 30250000 |
| TD Securities (USA) LLC | 30250000 |
|  | ___________ |
| TOTAL: | $550000000 |

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Schedule I-1

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**SCHEDULE II-A**

**PRICING DISCLOSURE PACKAGE**

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| | |
|:---|:---|
| 1) | Prospectus dated August 8, 2025 |
| 2) | Preliminary Prospectus Supplement dated September 16, 2025 (which shall be deemed to <br>include documents incorporated by reference therein) |
| 3) | Permitted Free Writing Prospectuses |
| | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a)&nbsp;&nbsp;&nbsp;&nbsp; Pricing Term Sheet |

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Schedule II-A-1

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**SCHEDULE II-B**

**LIMITED USE FREE WRITING PROSPECTUS**

1)&nbsp;&nbsp;&nbsp;&nbsp;Investor Presentation Slideshow, dated September 15, 2025

2)&nbsp;&nbsp;&nbsp;&nbsp;Investor Presentation Slideshow, dated September 16, 2025

&nbsp;&nbsp;&nbsp;&nbsp;Schedule II-B-1

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Schedule III

[Letterhead of TROUTMAN PEPPER LOCKE LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the Several Underwriters

SOUTHERN POWER COMPANY<br>Series 2025A 4.25% Senior Notes<br>due October 1, 2030

To the Addressees:

We have acted as counsel to Southern Power Company (the "Company") in connection with (i) the Company's issuance of $550,000,000 aggregate principal amount of its Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Notes") pursuant to a Senior Note Indenture dated as of August 1, 2025, by and between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as supplemented by the First Supplemental Indenture dated as of September 19, 2025 (collectively, the "Indenture"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 16, 2025, (the "Underwriting Agreement"), among the Company and the Underwriters named in Schedule I thereto (the "Underwriters") for whom you are acting as representatives (the "Representatives"). This opinion is being delivered to you as Representatives pursuant to Section 6(c)(1) of the Underwriting Agreement.

All capitalized terms not otherwise defined herein shall have the meanings set forth in the Underwriting Agreement.

In rendering the opinions expressed below, we have examined the following documents:

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-1

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&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's registration statement on Form S-3 (File No. 333-289172) pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement");

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's prospectus dated August 8, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act;

&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)&nbsp;&nbsp;&nbsp;&nbsp;The documents incorporated by reference into the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus (as hereinafter defined): the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2024 and the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2025 and June 30, 2024 (together, the "Pricing Exchange Act Documents");

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated September 16, 2025 (the "Exchange Act Documents"), each as filed under the Securities Exchange Act of 1934, as amended (the "Exchange Act");

&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)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Indenture;

&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)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Underwriting Agreement;

&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)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus pertaining to the Notes prepared by the Company and filed with the Commission on September 16, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus"); and

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's Certificate of Incorporation and By-Laws.

The documents listed in Schedule II-A to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

In addition, we have examined, and have relied as to factual matters upon, the documents delivered to you at the closing (except the certificates representing the Notes, of which we have examined specimens), and we have made such other and further investigations as we deemed necessary to express the opinions hereinafter set forth. In such examination, we have assumed (i) the genuineness of all signatures, (ii) the legal capacity of natural persons, (iii) the authenticity of all documents submitted to us as originals, and (iv) the conformity to original documents of all documents submitted to us as certified or photostatic copies and the authenticity of the originals of such latter documents.

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-2

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The Indenture and the Underwriting Agreement are herein referred to collectively as the "Agreements."

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion 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;1.&nbsp;&nbsp;&nbsp;&nbsp;The Company has been duly organized and is validly existing and in good standing as a corporation under the laws of the State of Delaware and has due corporate authority to conduct its business, to own and operate the properties used by it in such business and to enter into and perform its obligations under the Agreements and the Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;&nbsp;&nbsp;&nbsp;The execution, delivery and performance by the Company of the Underwriting Agreement have been duly authorized by all necessary corporate action, and the Underwriting Agreement has been duly executed and delivered by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;&nbsp;&nbsp;&nbsp;All orders, consents or other authorizations or approvals of the Federal Energy Regulatory Commission and the Commission legally required for the issuance and sale of the Notes have been obtained; such orders are sufficient for the issuance and sale of the Notes; the issuance and sale of the Notes conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval pursuant to the Delaware General Corporation Law or of the State of Georgia or any United States governmental body (other than in connection or in compliance with the provisions of the securities or "blue sky" laws of any jurisdiction, as to which we express no opinion) is legally required for the issuance and sale of the Notes in accordance with the terms of the Underwriting Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized, executed and delivered by the Company and, assuming the due authorization, execution and delivery thereof by the Trustee, constitutes a valid and legally binding instrument of the Company, enforceable against the Company in accordance with its terms, subject to the qualifications that the enforceability of the Company's obligations under the Indenture may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;&nbsp;&nbsp;&nbsp;The Notes have been duly authorized and executed by the Company and, when authenticated by the Trustee in the manner provided in the Indenture and delivered to and paid for by the Underwriters pursuant to the Underwriting Agreement, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, subject to the qualifications that the enforceability of the Company's obligations under the Notes may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.&nbsp;&nbsp;&nbsp;&nbsp;Each of the Indenture and the Notes conforms as to legal matters in all material respects to the descriptions thereof in the Pricing Disclosure Package and the Final Supplemented Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-3

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly qualified under the Trust Indenture Act of 1939, as amended.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Company of the Underwriting Agreement, the Indenture and the Notes, and the consummation of the transactions contemplated thereby, do not result in any violation of (i) the Certificate of Incorporation or By-Laws of the Company or (ii) the Delaware General Corporation Law or any existing applicable law, rule or regulation of the State of New York.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.&nbsp;&nbsp;&nbsp;&nbsp;The statements set forth in the Pricing Disclosure Package and the Final Supplemented Prospectus under the heading "Material United States Federal Income Tax Considerations for Non-United States Holders" insofar as they purport to constitute summaries of matters of United States federal income tax law constitute accurate summaries in all material respects subject to the qualifications set forth therein.

We do not purport to express any opinion herein concerning any law other than the laws of the State of Georgia, the federal law of the United States, the Delaware General Corporation Law and, to the extent set forth herein, the laws of the State of New York. As to all matters governed by or dependent upon the laws of the State of New York, we have, with your consent, relied upon the opinion of Hunton Andrews Kurth LLP dated the date hereof and addressed to you.

This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent. This opinion letter is expressed as of the date hereof, and we do not assume any obligation to update or supplement it to reflect any fact or circumstance that hereafter comes to our attention, or any change in law that hereafter occurs.

Yours very truly,

TROUTMAN PEPPER LOCKE LLP

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-4

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[Letterhead of TROUTMAN PEPPER LOCKE LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the Several Underwriters

SOUTHERN POWER COMPANY<br>Series 2025A 4.25% Senior Notes<br>due October 1, 2030

To the Addressees:

We have acted as counsel to Southern Power Company (the "Company") in connection with (i) the Company's issuance of $550,000,000 aggregate principal amount of its Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Notes") pursuant to a Senior Note Indenture dated as of August 1, 2025, by and between the Company and U.S. Bank Trust Company, National Association, as trustee, as supplemented by the First Supplemental Indenture dated as of September 19, 2025; and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 16, 2025 (the "Underwriting Agreement"), among the Company and the Underwriters named in Schedule I thereto (the "Underwriters") for whom you are acting as representatives (the "Representatives"). This letter is being delivered to you as Representatives pursuant to Section 6(c)(1) of the Underwriting Agreement.

All capitalized terms not otherwise defined herein shall have the meanings set forth in the Underwriting Agreement.

In the above capacity, we have examined the Company's registration statement on Form S-3 (File No. 333-289172) pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement"); the Company's prospectus dated August 8, 2025 (the "Base

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-5

------

Prospectus"), as supplemented by a preliminary prospectus supplement pertaining to the Notes dated September 16, 2025 (the "Pricing Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act which, pursuant to Form S-3, incorporates by reference the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2024 and the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2025 and June 30, 2025 (together, the "Pricing Exchange Act Documents"), and a prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated September 16, 2025 (the "Exchange Act Documents"), each as filed under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). We have also examined the free writing prospectus pertaining to the Notes prepared by the Company and filed with the Commission on September 16, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus"). The documents listed in Schedule II-A to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

We have participated in various conferences with the Company, its representatives, representatives of the independent public or certified public accountants of the Company and your counsel at which the contents of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents and related matters were discussed and reviewed. Because of the inherent limitations in the independent verification of factual matters, and the character of the determinations involved in the preparation of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents, we are not passing upon and do not assume any responsibility for, and make no representation that we have independently verified, the accuracy, completeness or fairness of the statements contained therein (other than as specified in opinion paragraphs 6 and 9 of our opinion to you related to the Indenture and the Notes and the matters of United States federal income tax law dated of even date herewith). However, on the basis of the foregoing, we advise you that nothing has come to our attention which has caused us to believe 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;(i)&nbsp;&nbsp;&nbsp;&nbsp;the Registration Statement, on the Effective Date (including the Exchange Act Documents on file with the Commission as of such date), contained any untrue statement of a material fact or omitted to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading,

&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)&nbsp;&nbsp;&nbsp;&nbsp;the Pricing Disclosure Package (including the Pricing Exchange Act Documents), as of the Applicable Time, included an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading, 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)&nbsp;&nbsp;&nbsp;&nbsp;the Final Supplemented Prospectus (including the Exchange Act Documents) contained, as of its date, or contains, on the date hereof, any untrue statement of a material fact or omitted, as of its date, or omits, on the date hereof, to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading,

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-6

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except that in each case we express no belief with respect to the financial statements and schedules and notes thereto or other financial or statistical data contained or incorporated by reference in (or omitted from) the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus or the Exchange Act Documents and with respect to information set forth in the Pricing Prospectus and the Final Supplemented Prospectus under the captions "Description of the Series 2025A Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company" and "Description of the Series 2025A Senior Notes ─ Global Clearance and Settlement Procedures."

Subject to and on the basis of the foregoing, we further advise you that the Registration Statement, on the Effective Date, and the Final Supplemented Prospectus, as of September 16, 2025, complied as to form in all material respects with the relevant requirements of the Act and the applicable rules and regulations of the Commission thereunder and that each Exchange Act Document, as of its date of filing with the Commission, complied as to form in all material respects with the relevant requirements of the Exchange Act and the applicable rules and regulations of the Commission thereunder, except that in each case we express no belief as to the financial statements and schedules and notes thereto or other financial or statistical data contained or incorporated by reference in (or omitted from) the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus or the Exchange Act Documents.

This letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent. This letter is expressed as of the date hereof, and we do not assume any obligation to update or supplement it to reflect any fact or circumstance that hereafter comes to our attention or any change in law that hereafter occurs.

Yours very truly,

TROUTMAN PEPPER LOCKE LLP

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-7

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Schedule IV

[Letterhead of EMMET, MARVIN & MARTIN, LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the several Underwriters

Southern Power Company

30 Ivan Allen Jr. Blvd., N.W.

Atlanta, Georgia 30308

SOUTHERN POWER COMPANY<br>Series 2025A 4.25% Senior Notes due October 1, 2030

Ladies and Gentlemen:

We have acted as counsel for U.S. Bank Trust Company, National Association ("U.S. Bank Trust Company"), in connection with the issuance by Southern Power Company (the "Company") of $550,000,000 aggregate principal amount of Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Notes"). The Notes are being issued under the Senior Note Indenture, dated as of August 1, 2025 (the "Original Indenture"), between the Company and U.S. Bank Trust Company, as trustee (in such capacity, the "Trustee"), as supplemented by the First Supplemental Indenture, dated as of September 19, 2025 (the "Supplemental Indenture" and, together with the Original Indenture, the "Indenture"), between the Company and the Trustee.

For purposes of this opinion, we have reviewed the Indenture and such other documents, records and papers, and satisfied ourselves as to such other matters, as we have deemed necessary or appropriate for this opinion. As to questions of fact material to this opinion, we have relied on certificates of U.S. Bank Trust Company and of public officials. In such review, we have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of

&nbsp;&nbsp;&nbsp;&nbsp;Schedule IV-1

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all documents submitted to us as originals, the conformity to the originals of all documents submitted to us as copies or forms and the authenticity of the originals of such latter documents. We have assumed that U.S. Bank Trust Company has been duly formed and that the Indenture has been duly authorized, executed and delivered by the Company and constitutes the valid and binding agreement of, and is enforceable in accordance with its terms against, the Company.

Based upon the foregoing and subject to the qualifications below, we are of the opinion that:

1)&nbsp;&nbsp;&nbsp;&nbsp;Based solely on a certificate from the Comptroller of the Currency, U.S. Bank Trust Company is a national banking association formed under the laws of the United States and is authorized thereunder to transact the business of banking and exercise fiduciary powers and perform its obligations under the Indenture.

2)&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized, executed and delivered by U.S. Bank Trust Company and the Indenture constitutes a valid and binding agreement of U.S. Bank Trust Company enforceable against U.S. Bank Trust Company in accordance with its terms, except as may be limited by bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and general equitable principles (whether considered in a proceeding in equity or at law) and by an implied covenant of reasonableness, good faith and fair dealing.

We are members of the Bar of the State of New York and, for purposes of this opinion, do not hold ourselves out as experts on the laws of any jurisdiction other than the State of New York and the federal law of the United States. The opinions expressed herein are limited to matters of law solely on applicable provisions of the following, as currently in effect: (i) as to the opinions expressed in paragraphs (1) and (2), the National Bank Act and the regulations of the Office of the Comptroller of the Currency published in 12 C.F.R. Parts 1-199 and (ii) as to the opinion expressed in paragraph (2), subject to the exclusions and limitations set forth in this opinion letter, internal New York law.

This opinion is solely for your benefit in connection with the issuance and sale by the Company of the Notes and may not be relied upon by you for any other purpose, or relied upon or furnished to any other person, without our prior written consent, except that copies of this opinion may be furnished to, but not relied upon by, (i) your independent auditors, advisors and legal counsel, or (ii) any person in order to comply with any subpoena, order, regulation, ruling or request of any judicial, administrative, governmental, supervisory or legislative body or committee or any self-regulatory body.

Very truly yours,

&nbsp;&nbsp;&nbsp;&nbsp;Schedule IV-2

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Schedule V

[Letterhead of HUNTON ANDREWS KURTH LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the Several Underwriters

SOUTHERN POWER COMPANY<br>Series 2025A 4.25% Senior Notes<br>due October 1, 2030

To the Addressees:

We have represented the Underwriters (as hereinafter defined) in connection with (i) the issuance and sale by Southern Power Company (the "Company") of $550,000,000 aggregate principal amount of its Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Notes") pursuant to a Senior Note Indenture, dated as of August 1, 2025, by and between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as supplemented by the First Supplemental Indenture, dated as of September 19, 2025 (collectively, the "Indenture"); and (ii) the purchase by the Underwriters of the Notes pursuant to the terms of an Underwriting Agreement, dated September 16, 2025 (the "Underwriting Agreement"), among the Company and the Underwriters named in Schedule I thereto (the "Underwriters") for whom you are acting as representatives (the "Representatives"). This opinion letter is being delivered to you in your capacity as Representatives pursuant to Section 6(c)(3) of the Underwriting Agreement.

All capitalized terms not otherwise defined herein shall have the meanings set forth in the Underwriting Agreement.

In rendering the opinions expressed below, we have examined the following documents:

Schedule V-1

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&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's registration statement on Form S-3 (File No. 333-289172) pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement");

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's prospectus dated August 8, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act;

&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)&nbsp;&nbsp;&nbsp;&nbsp;The documents incorporated by reference into the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus (as hereinafter defined): the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2024 and the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2025 and June 30, 2025 (together, the "Pricing Exchange Act Documents");

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated September 16, 2025 (the "Exchange Act Documents"), each as filed under the Securities Exchange Act of 1934, as amended (the "Exchange Act");

&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)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Indenture;

&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)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Underwriting Agreement;

&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)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus pertaining to the Notes prepared by the Company and filed with the Commission on September 16, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus"); and

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's Certificate of Incorporation and By-Laws.

The documents listed in Schedule II-A to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

In addition, we have examined, and have relied as to factual matters upon, the documents delivered to you at the closing (except the certificates representing the Notes, of which we have examined specimens), and we have made such other and further investigations as we deemed necessary to express the opinions hereinafter set forth. In such examination, we have assumed (i) the genuineness of all signatures, (ii) the legal capacity of natural persons, (iii) the authenticity of all documents submitted to us as originals, and (iv) the conformity to original documents of all documents submitted to us as certified or photostatic copies and the authenticity of the originals of such latter documents.

Schedule V-2

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The Indenture and the Underwriting Agreement are herein referred to collectively as the "Agreements."

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion 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;1.&nbsp;&nbsp;&nbsp;&nbsp;The Company has been duly organized and is validly existing and in good standing as a corporation under the laws of the State of Delaware and has due corporate authority to conduct its business, to own and operate the properties used by it in such business and to enter into and perform its obligations under the Agreements and the Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;&nbsp;&nbsp;&nbsp;The execution, delivery and performance by the Company of the Underwriting Agreement have been duly authorized by all necessary corporate action, and the Underwriting Agreement has been duly executed and delivered by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;&nbsp;&nbsp;&nbsp;All orders, consents or other authorizations or approvals of the Federal Energy Regulatory Commission and the Commission legally required for the issuance and sale of the Notes have been obtained; such orders are sufficient for the issuance and sale of the Notes; the issuance and sale of the Notes conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval pursuant to the Delaware General Corporation Law or of any New York or any United States governmental body (other than in connection or in compliance with the provisions of the securities or "blue sky" laws of any jurisdiction, as to which we express no opinion) is legally required for the issuance and sale of the Notes in accordance with the terms of the Underwriting Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized, executed and delivered by the Company and, assuming the due authorization, execution and delivery thereof by the Trustee, constitutes a valid and legally binding instrument of the Company, enforceable against the Company in accordance with its terms, subject to the qualifications that the enforceability of the Company's obligations under the Indenture may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;&nbsp;&nbsp;&nbsp;The Notes have been duly authorized and executed by the Company and, when authenticated by the Trustee in the manner provided in the Indenture and delivered to and paid for by the Underwriters pursuant to the Underwriting Agreement, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, subject to the qualifications that the enforceability of the Company's obligations under the Notes may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.&nbsp;&nbsp;&nbsp;&nbsp;Each of the Indenture and the Notes conforms as to legal matters in all material respects to the descriptions thereof in the Pricing Disclosure Package and the Final Supplemented Prospectus.

Schedule V-3

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly qualified under the Trust Indenture Act of 1939, as amended.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Company of the Agreements and the Notes, and the consummation of the transactions contemplated thereby, do not result in any violation of (i) the Certificate of Incorporation or By-Laws of the Company or (ii) the Delaware General Corporation Law or any existing applicable law, rule or regulation of the State of New York.

We do not purport to express any opinion herein concerning any law other than the law of the State of New York, the federal law of the United States and the Delaware General Corporation Law.

This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent except that Troutman Pepper Locke LLP may rely on this opinion letter in giving its opinions pursuant to Section 6 of the Underwriting Agreement and Sections 102, 302 and 904 of the Indenture, insofar as such opinions relate to matters of New York law. This opinion letter is expressed as of the date hereof, and we do not assume any obligation to update or supplement it to reflect any fact or circumstance that hereafter comes to our attention, or any change in law that hereafter occurs.

Very truly yours,

HUNTON ANDREWS KURTH LLP

Schedule V-4

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[Letterhead of HUNTON ANDREWS KURTH LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the Several Underwriters

SOUTHERN POWER COMPANY<br>Series 2025A 4.25% Senior Notes<br>due October 1, 2030

To the Addressees:

We have represented the Underwriters (as hereinafter defined) in connection with (i) the issuance and sale by Southern Power Company (the "Company") of $550,000,000 aggregate principal amount of its Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Notes") pursuant to a Senior Note Indenture, dated as of August 1, 2025, by and between the Company and U.S. Bank Trust Company, National Association, as trustee, as supplemented by the First Supplemental Indenture, dated as of September 19, 2025; and (ii) the purchase by the Underwriters of the Notes pursuant to the terms of an Underwriting Agreement, dated September 16, 2025 (the "Underwriting Agreement"), among the Company and the Underwriters named in Schedule I thereto (the "Underwriters") for whom you are acting as representatives (the "Representatives"). This letter is being delivered to you as Representatives pursuant to Section 6(c)(3) of the Underwriting Agreement.

All capitalized terms not otherwise defined herein shall have the meanings set forth in the Underwriting Agreement.

In the above capacity, we have examined the Company's registration statement on Form S-3 (File No. 333-289172) pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement"); the Company's prospectus dated August 8, 2025 (the "Base

Schedule V-5

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Prospectus"), as supplemented by a preliminary prospectus supplement pertaining to the Notes dated September 16, 2025 (the "Pricing Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act which, pursuant to Form S-3, incorporates by reference the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2024 and the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2025 and June 30, 2025 (together, the "Pricing Exchange Act Documents"), and a prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated September 16, 2025 (the "Exchange Act Documents"), each as filed under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). We have also examined the free writing prospectus pertaining to the Notes prepared by the Company and filed with the Commission on September 16, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus"). The documents listed in Schedule II-A to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

We have participated in various conferences with the Company, its counsel, its representatives and representatives of the independent public or certified public accountants of the Company at which the contents of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents and related matters were discussed and reviewed. Because of the inherent limitations in the independent verification of factual matters, and the character of the determinations involved in the preparation of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents, we are not passing upon and do not assume any responsibility for, and make no representation that we have independently verified, the accuracy, completeness or fairness of the statements contained therein (other than as specified in opinion paragraph 6 of our opinion letter to you related to the Indenture and the Notes dated of even date herewith). However, on the basis of the foregoing, we advise you that nothing has come to our attention which has caused us to believe 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;(i)&nbsp;&nbsp;&nbsp;&nbsp;the Registration Statement, on the Effective Date (including the Exchange Act Documents on file with the Commission as of such date), contained any untrue statement of a material fact or omitted to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading,

&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)&nbsp;&nbsp;&nbsp;&nbsp;the Pricing Disclosure Package (including the Pricing Exchange Act Documents), as of the Applicable Time, included an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading, 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)&nbsp;&nbsp;&nbsp;&nbsp;the Final Supplemented Prospectus (including the Exchange Act Documents) contained, as of its date, or contains, on the date hereof, any untrue statement of a material fact or omitted, as of its date, or omits, on the date hereof, to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading,

Schedule V-6

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except that in each case we express no belief with respect to the financial statements and schedules and notes thereto or other financial or statistical data contained or incorporated by reference in (or omitted from) the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus or the Exchange Act Documents and with respect to information set forth in the Pricing Prospectus and the Final Supplemented Prospectus under the captions "Description of the Series 2025A Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company" and "Description of the Series 2025A Senior Notes ─ Global Clearance and Settlement Procedures."

Subject to and on the basis of the foregoing, we further advise you that the Registration Statement, on the Effective Date, and the Final Supplemented Prospectus, as of September 16, 2025, complied as to form in all material respects with the relevant requirements of the Act and the applicable rules and regulations of the Commission thereunder and that each Exchange Act Document, as of its date of filing with the Commission, complied as to form in all material respects with the relevant requirements of the Exchange Act and the applicable rules and regulations of the Commission thereunder, except that in each case we express no belief as to the financial statements and schedules and notes thereto or other financial or statistical data contained or incorporated by reference in (or omitted from) the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus or the Exchange Act Documents.

This letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent. This letter is expressed as of the date hereof, and we do not assume any obligation to update or supplement it to reflect any fact or circumstance that hereafter comes to our attention, or any change in law that hereafter occurs.

Very truly yours,

HUNTON ANDREWS KURTH LLP

Schedule V-7

## Exhibit 1.2

Exhibit 1.2(b)

$550,000,000

Series 2025B 4.90% Senior Notes

due October 1, 2035

**SOUTHERN POWER COMPANY**

UNDERWRITING AGREEMENT

September 16, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

as Representatives of the Several Underwriters named in Schedule I hereto

Ladies and Gentlemen:

Southern Power Company, a Delaware corporation (the "Company"), confirms its agreement (the "Agreement") with you and each of the other Underwriters named in Schedule I hereto (collectively, the "Underwriters," which term shall also include any underwriter substituted as hereinafter provided in Section 11 hereof) for whom you are acting as representatives (in such capacity you shall hereinafter be referred to as the "Representatives"), with respect to the sale by the Company and the purchase by the Underwriters, acting severally and not jointly, of $550,000,000 aggregate principal amount of the Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Senior Notes") as set forth in Schedule I hereto.

The Company understands that the Underwriters propose to make a public offering of the Senior Notes as soon as the Representatives deem advisable after this Agreement has been executed and delivered. The Senior Notes will be issued pursuant to an indenture, dated as of August 1, 2025 (the "Base Indenture"), by and between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as to be supplemented by a second supplemental indenture, dated as of September 19, 2025, to the Base Indenture relating to the Senior Notes (the "Second Supplemental Indenture" and, together with the Base Indenture and any

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other amendments or supplements thereto, the "Indenture"), between the Company and the Trustee.

The Company is concurrently offering $550,000,000 aggregate principal amount of its Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Series 2025A Senior Notes"), pursuant to a separate underwriting agreement to be entered into by and among the Company and the underwriters named therein.

SECTION 1.&nbsp;&nbsp;&nbsp;&nbsp;<u>REPRESENTATIONS AND WARRANTIES</u>. The Company represents and warrants to the Underwriters 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)&nbsp;&nbsp;&nbsp;&nbsp;A registration statement on Form S-3 (File No. 333-289172) in respect of the Senior Notes and certain other securities has been prepared and filed in accordance with the provisions of the Securities Act of 1933, as amended (the "1933 Act"), with the Securities and Exchange Commission (the "Commission"); such registration statement and any post-effective amendment thereto, each in the form heretofore delivered or to be delivered to the Underwriters, has been declared effective by the Commission in such form (except that copies of the registration statement and any post-effective amendment delivered to the Underwriters need not include exhibits but shall include all documents incorporated by reference therein); 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 against the Company or related to the offering has been initiated or, to the best knowledge of the Company, threatened by the Commission (any preliminary prospectus, as supplemented by a preliminary prospectus supplement, included in such registration statement or filed with the Commission pursuant to Rule 424(a) of the rules and regulations of the Commission under the 1933 Act, being hereinafter called a "Preliminary Prospectus"); such registration statement as used with respect to the Senior Notes, including the information deemed a part thereof pursuant to Rule 430B(f)(1) under the 1933 Act 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 Senior Notes pursuant to Rule 430B(f)(2) under the 1933 Act (the "Effective Date"), including the exhibits thereto and all documents incorporated by reference therein pursuant to Item 12 of Form S-3 at the Effective Date, being hereinafter called the "Registration Statement"; the base prospectus relating to the Senior Notes and certain other securities of the Company, in the form in which it has most recently been filed with the Commission on or prior to the date of this Agreement relating to the Senior Notes, being hereinafter called the "Base Prospectus"; the Base Prospectus as amended and supplemented by a preliminary prospectus supplement dated September 16, 2025 relating to the Senior Notes which has been filed with the Commission pursuant to Rule 424(b) under the 1933 Act, as it may be further amended and supplemented immediately prior to the Applicable Time (as hereinafter defined) is hereinafter called the "Pricing Prospectus"; the Base Prospectus as amended or supplemented in final form, including by a prospectus supplement relating to the Senior Notes in the form in which it is filed with the Commission, pursuant to Rule 424(b) under the 1933 Act in accordance with Section 4(e) hereof is hereinafter called the "Final Supplemented Prospectus"; any reference herein to any Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus or the Final Supplemented Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the 1933 Act, as of the date of such Preliminary Prospectus, Base Prospectus, Pricing Prospectus or Final Supplemented Prospectus, as the case may be; any reference to any amendment or supplement to any Preliminary

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Prospectus, the Base Prospectus, the Pricing Prospectus or the Final Supplemented Prospectus shall be deemed to refer to and include any documents filed after the date of such Preliminary Prospectus, Base Prospectus, Pricing Prospectus or Final Supplemented 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, Base Prospectus, Pricing Prospectus or Final Supplemented Prospectus, as the case may be; 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 "Applicable Time" is 5:15 P.M. (New York time) on the date of this Agreement; the documents listed in Schedule II-A, taken together and attached hereto, are collectively referred to as the "Pricing Disclosure Package." The term "Limited Use Free Writing Prospectus" shall mean any "written communication" (as defined by Rule 405 under the 1933 Act) in addition to the Pricing Disclosure Package the use of which has been consented to by the Company and the Representatives as listed in Schedule II-B hereto, including any recorded road show.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The documents incorporated by reference in the Registration Statement or the Pricing Prospectus, when they were filed with the Commission, complied in all material respects with the applicable provisions of the 1934 Act and the rules and regulations of the Commission thereunder and, as of such time of filing, when read together with the Pricing Prospectus and any Permitted Free Writing Prospectus (as defined in Section 3(a) hereof), none of such documents 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, in light of the circumstances under which they were made, not misleading; and any further documents so filed and incorporated by reference in the Final Supplemented Prospectus or any further amendment or supplement thereto, when such documents are filed with the Commission, will comply in all material respects with the applicable provisions of the 1934 Act and the rules and regulations of the Commission thereunder and, when read together with the Final Supplemented Prospectus as it otherwise may be amended or supplemented, 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 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: (A) any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use in the Pricing Prospectus, any Permitted Free Writing Prospectus and the Final Supplemented Prospectus; or (B) any information set forth in the Pricing Prospectus or the Final Supplemented Prospectus under the captions "Description of the Series 2025B Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company" and "Description of the Series 2025B Senior Notes ─ Global Clearance and Settlement Procedures."

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Registration Statement and the Final Supplemented Prospectus comply, and any further amendments or supplements thereto, when any such amendments become effective or supplements are filed with the Commission, as the case may be, will comply, in all material respects with the applicable provisions of the 1933 Act, the 1934 Act, the 1939 Act (as hereinafter defined) and the General Rules and Regulations of the Commission thereunder and the

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Registration Statement, the Pricing Disclosure Package and the Final Supplemented Prospectus do not and will not, (i) as of the Effective Date as to the Registration Statement and any amendment thereto, (ii) as of the Applicable Time as to the Pricing Disclosure Package and (iii) as of the date of the Final Supplemented Prospectus as to the Final Supplemented Prospectus or as of the date when any supplement is filed as to the Final Supplemented Prospectus as further supplemented or as of the Closing Date (as hereinafter defined) as to the Final Supplemented Prospectus or the Final Supplemented Prospectus as it may be further supplemented as provided above, contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein not misleading in the case of the Registration Statement and any amendment thereto, and, in light of the circumstances under which they were made, not misleading in the case of the Pricing Disclosure Package and the Final Supplemented Prospectus as further supplemented; except that the Company makes no warranties or representations with respect to (A) that part of the Registration Statement which shall constitute the Statement of Eligibility (Form T-1) under the Trust Indenture Act of 1939, as amended (the "1939 Act"), (B) any statements or omissions made in a Permitted Free Writing Prospectus, the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein or (C) any information set forth in the Pricing Prospectus or the Final Supplemented Prospectus under the captions "Description of the Series 2025B Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company" and "Description of the Series 2025B Senior Notes ─ Global Clearance and Settlement Procedures."

&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)&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;Each Permitted Free Writing Prospectus listed on Schedule II-A hereto does not include anything that conflicts with the information contained in the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus and each such Permitted Free Writing Prospectus, as supplemented by and taken together with the Pricing Disclosure Package as of the Applicable Time, did not contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in 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 statement or omissions made in a Permitted Free Writing Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein.

&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;(ii)&nbsp;&nbsp;&nbsp;&nbsp;Each Limited Use Free Writing Prospectus listed on Schedule II-B hereto does not include anything that conflicts with the information contained in the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus and each Limited Use Free Writing Prospectus, as supplemented by and taken together with the Pricing Disclosure Package as of the Applicable Time, did not contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in 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 a Limited Use Free Writing Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein.

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&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;(e)&nbsp;&nbsp;&nbsp;&nbsp;With respect to the Registration Statement, the conditions for use of Form S-3, as set forth in the General Instructions thereof, have been satisfied.

&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)&nbsp;&nbsp;&nbsp;&nbsp;At the determination date for purposes of the Senior Notes within the meaning of Rule 164(h) under the 1933 Act, the Company was not an "ineligible issuer" as defined in Rule 405 under the 1933 Act.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Since the respective dates as of which information is given in the Registration Statement and the Pricing Prospectus, except as otherwise stated therein, there has been no material adverse change in the business, properties or financial condition of the Company, whether or not arising in the ordinary course of business.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company is a corporation duly organized and existing under the laws of the State of Delaware and has due corporate authority to conduct its business and to own and operate the properties used by it in such business, to enter into and perform its obligations under this Agreement and the Indenture and to issue and sell the Senior Notes to the Underwriters.

&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)&nbsp;&nbsp;&nbsp;&nbsp;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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j)&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized by the Company and, on the Closing Date, will have been duly executed and delivered by the Company, and, assuming the due authorization, execution and delivery of the Indenture by the Trustee, the Indenture will, on the Closing Date, constitute a valid and legally binding obligation of the Company, enforceable against the Company in accordance with its terms, except to the extent that enforcement thereof may be limited by (1) bankruptcy, insolvency, reorganization, receivership, liquidation, fraudulent conveyance, moratorium or other similar laws affecting creditors' rights generally or (2) general principles of equity (regardless of whether enforcement is considered in a proceeding at law or in equity) (the "Enforceability Exceptions"); the Indenture will conform in all material respects to all statements relating thereto contained in the Pricing Disclosure Package and the Final Supplemented Prospectus; and, on the Closing Date, the Indenture will have been duly qualified under the 1939 Act.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k)&nbsp;&nbsp;&nbsp;&nbsp;The issuance and delivery of the Senior Notes have been duly authorized by the Company and, on the Closing Date, the Senior Notes will have been duly executed by the Company and, when authenticated in the manner provided for in the Indenture and delivered against payment therefor as described in this Agreement, will constitute valid and legally binding obligations of the Company, enforceable against the Company in accordance with their terms, except to the extent that enforcement thereof may be limited by the Enforceability Exceptions, will be in the form contemplated by, and entitled to the benefits of, the Indenture and will conform in all material respects to all statements relating thereto in the Registration Statement, the Pricing Disclosure Package and the Final Supplemented Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l)&nbsp;&nbsp;&nbsp;&nbsp;The execution, delivery and performance by the Company of this Agreement, the Indenture and the Senior Notes and the consummation by the Company of the transactions contemplated herein and therein and compliance by the Company with its obligations hereunder and thereunder shall have been duly authorized by all necessary corporate action on the

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part of the Company and do not and will not result in any violation of the Certificate of Incorporation or By-Laws of the Company, and do not and will not conflict with, or result in a breach of any of the terms or provisions of, or constitute a default under, or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company under (A) any contract, indenture, mortgage, loan agreement, note, lease or other agreement or instrument to which the Company is a party or by which it may be bound or to which any of its properties may be subject (except for conflicts, breaches or defaults which would not, individually or in the aggregate, be materially adverse to the Company or materially adverse to the transactions contemplated by this Agreement), or (B) any existing applicable law, rule, regulation, judgment, order or decree of any government, governmental instrumentality or court, domestic or foreign, or any regulatory body or administrative agency or other governmental body having jurisdiction over the Company or any of its properties.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(m)&nbsp;&nbsp;&nbsp;&nbsp;No authorization, approval, consent or order of any court or governmental authority or agency is necessary in connection with the issuance and sale by the Company of the Senior Notes or the transactions by the Company contemplated in this Agreement, except (A) such as may be required under the 1933 Act or the rules and regulations thereunder; (B) such as may be required under the Federal Power Act; (C) such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or "blue sky" laws and (D) the qualification of the Indenture under the 1939 Act.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(n)&nbsp;&nbsp;&nbsp;&nbsp;The financial statements of the Company incorporated by reference in the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, together with the related schedules and notes, present fairly, in all material respects, the financial position, results of operations and cash flows of the Company as of and for the dates indicated; said financial statements have been prepared in conformity with accounting principles generally accepted in the United States ("GAAP") applied on a consistent basis (except that the unaudited financial statements incorporated by reference in the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus may be subject to normal year-end adjustments) throughout the periods involved and necessarily include amounts that are based on the best estimates and judgments of management. The selected financial data and the summary financial information included in the Pricing Prospectus and the Final Supplemented Prospectus present fairly the information shown therein and have been compiled on a basis consistent with that of the audited and unaudited financial statements of the Company incorporated by reference in the Registration Statement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(o)&nbsp;&nbsp;&nbsp;&nbsp;Neither the Company nor, to the knowledge of the Company, any director, officer, agent, employee or subsidiary of the Company is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department ("OFAC"); and the Company will not directly or indirectly use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity, for the purpose of financing the activities of any person that, at the time of such financing, is subject to any U.S. sanctions administered by OFAC.

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SECTION 2.&nbsp;&nbsp;&nbsp;&nbsp;<u>SALE AND DELIVERY TO THE UNDERWRITERS; CLOSING; SELLING RESTRICTIONS</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;On the basis of the representations and warranties herein contained and subject to the terms and conditions herein set forth, the Company agrees to sell to each Underwriter, severally and not jointly, and each Underwriter, severally and not jointly, agrees to purchase from the Company, the principal amount of Senior Notes set forth in Schedule I to this Agreement opposite the name of such Underwriter (plus any additional amount of Senior Notes that such Underwriter may become obligated to purchase pursuant to the provisions of Section 11 hereof), at a price equal to 99.097% of the principal amount thereof.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Payment of the purchase price and delivery of the certificate(s) for the Senior Notes shall be made at the offices of Southern Company Services, Inc., 30 Ivan Allen Jr. Blvd., NW, Atlanta, Georgia 30308 at 10:00 A.M., New York time, on September 19, 2025 (unless postponed in accordance with the provisions of Section 11 hereof) or such other time, place or date as shall be agreed upon by the Representatives and the Company (such time and date of payment and delivery being herein called the "Closing Date"). Payment shall be made to the Company by wire transfer in federal funds at the Closing Date against delivery of the Senior Notes to Mizuho Securities USA LLC on behalf of all of the Underwriters. It is understood that each Underwriter has authorized Mizuho Securities USA LLC, for each Underwriter's account, to accept delivery of, receipt for, and make payment of, the principal amount of the Senior Notes which each Underwriter has agreed to purchase. Mizuho Securities USA LLC, individually and not as a representative of the Underwriters, may (but shall not be obligated to) make payment of the principal amount of the Senior Notes to be purchased by any Underwriter whose payment has not been received by the Closing Date, but such payment shall not relieve such Underwriter from its obligations hereunder.

The delivery of the Senior Notes shall be made in fully registered form, registered in the name of CEDE & CO., to the offices of The Depository Trust Company in New York, New York or its designee, and the Representatives shall accept such delivery.

The certificate(s) for the Senior Notes will be made available for examination by the Representatives not later than 12:00 Noon, New York time, on the last business day prior to the Closing Date.

&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)&nbsp;&nbsp;&nbsp;&nbsp;(i) Each Underwriter will not offer, sell or deliver any of the Senior Notes, directly or indirectly, or distribute the Pricing Prospectus, the Final Supplemented Prospectus or any other offering material relating to the Senior Notes, in or from any jurisdiction except under circumstances that will, to the best of such Underwriter's knowledge and belief, result in compliance with the applicable laws and regulations and which will not impose any obligations on the Company except as set forth in this Agreement.

&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) Each Underwriter will sell the Senior Notes in Canada only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 *Prospectus Exemptions* or subsection 73.3(1) of the *Securities Act* (Ontario), and are permitted clients, as defined in National Instrument 31-103 *Registration Requirements, Exemptions and Ongoing Registrant Obligations*.

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&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) In relation to each member state of the European Economic Area ("EEA"), each Underwriter has not offered, sold or otherwise made available and will not offer, sell or otherwise make available to any retail investor in the EEA, the Senior Notes.

For the purposes of paragraph (iii), a retail investor means a person who is one (or more) of: (i) a retail client as defined in point (11) of Article 4(1) of Directive 2014/65/EU (as amended, "MiFID II"); or (ii) a customer within the meaning of Directive (EU) 2016/97, as amended, where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or (iii) not a qualified investor as defined in Regulation (EU) 2017/1129 (as amended).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) In relation to the United Kingdom ("UK"), each Underwriter has not offered, sold or otherwise made available and will not offer, sell or otherwise make available to any retail investor in the UK any of the Senior Notes.

For the purposes of paragraph (iv), a "retail investor" means a person who is one (or more) of the following: (i) a retail client, as defined in point (8) of Article 2 of Regulation (EU) No 2017/565 as it forms part of domestic law by virtue of the European Union (Withdrawal) Act 2018 (as amended, the "EUWA"); (ii) a customer within the meaning of the provisions of the Financial Services and Markets Act 2000 (as amended, the "FSMA") and any rules or regulations made under the FSMA to implement Directive (EU) 2016/97, where that customer would not qualify as a professional client, as defined in point (8) of Article 2(1) of Regulation (EU) No 600/2014 as it forms part of domestic law by virtue of the EUWA; or (iii) not a qualified investor as defined in Article 2 of Regulation (EU) 2017/1129 as it forms part of domestic law by virtue of the EUWA.

Each Underwriter (A) has only communicated or caused to be communicated and will only communicate or cause to be communicated any invitation or inducement to engage in investment activity (within the meaning of Section 21 of the FSMA) received by it in connection with the issue or sale of the Senior Notes in circumstances in which Section 21(1) of the FSMA does not apply to the Company; and (B) has complied and will comply with all applicable provisions of the FSMA with respect to anything done by it in relation to the Senior Notes in, from or otherwise involving the UK.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) Each Underwriter will not offer or sell any Senior Notes, directly or indirectly, in Japan or to, or for the account or benefit of, any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan), or to, or for the account or benefit of, others for re-offering or resale, directly or indirectly, in Japan or to, or for the account or benefit of, any resident of Japan, except pursuant to an exemption from the registration requirements of, and otherwise in compliance with, the Financial Instruments and Exchange Law (Act No. 25 of 1948, as amended) and any other applicable laws, regulations and ministerial guidelines of Japan in effect at the relevant time.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) Each Underwriter represents and agrees that the Senior Notes may not be offered, sold or delivered, directly or indirectly, in the Republic of Korea or to, or for the account or benefit of, any resident of the Republic of Korea (as defined in the Foreign Exchange

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Transactions Law of the Republic of Korea and its Enforcement Decree) or to others for re-offering or resale, except as otherwise permitted by applicable Korean laws and regulations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vii) Each Underwriter agrees that, in connection with the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the Senior Notes, the Senior Notes may not be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an institutional investor as defined in Section 4A of the Securities and Futures Act, 2001 of Singapore, as modified or amended from time to time (the "SFA"), pursuant to Section 274 of the SFA, (ii) to a relevant person (as defined in Section 275(2) of the SFA) pursuant to Section 275(1) of the SFA, or any person pursuant to Section 275(1A) of the SFA, and in accordance with the conditions specified in Section 275 of the SFA, and (where applicable) Regulation 3 of the Securities and Futures (Classes of Investors) Regulations 2018 of Singapore, or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(viii) Each Underwriter will not publicly distribute or otherwise make publicly available in Switzerland the Preliminary Prospectus, the Final Supplemented Prospectus or any other offering or marketing material relating to the Senior Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ix) Each Underwriter has not registered and will not register the Senior Notes with the Financial Supervisory Commission of Taiwan, the Republic of China ("Taiwan") pursuant to relevant securities laws and regulations. Each Underwriter represents and agrees that (A) the Senior Notes may not be sold, issued or offered within Taiwan through a public offering or in circumstances which constitutes an offer within the meaning of the Securities and Exchange Act of Taiwan or relevant laws and regulations that require a registration, filing or approval of the Financial Supervisory Commission of Taiwan and (B) no person or entity in Taiwan has been authorized to offer, sell, give advice regarding or otherwise intermediate the offering and sale of the Senior Notes in Taiwan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x) Each Underwriter has not publicly offered, sold, promoted or advertised the Senior Notes, and will not publicly offer, sell, promote or advertise the Senior Notes, in the United Arab Emirates (the "UAE") (including the Dubai International Financial Centre) other than in compliance with the laws of the UAE (and the Dubai International Financial Centre) governing the issue, offering and sale of securities.

SECTION 3.&nbsp;&nbsp;&nbsp;&nbsp;<u>FREE WRITING PROSPECTUSES</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company represents and agrees that, without the prior consent of the Representatives, it has not made and will not make any offer relating to the Senior Notes that would constitute a "free writing prospectus" as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus and a Limited Use Free Writing Prospectus; each Underwriter, severally and not jointly, represents and agrees that, without the prior consent of the Company and the Representatives, it has not made and will not make any offer relating to the Senior Notes that would constitute a "free writing prospectus" as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus, a Limited Use Free Writing Prospectus or a free writing prospectus that is not required to be filed by the Company pursuant to Rule 433

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under the 1933 Act or one or more free writing prospectuses through customary Bloomberg distribution that do not contain substantive changes from or additions to the information contained in the free writing prospectus, dated the date hereof, filed pursuant to Rule 433(d) under the 1933 Act relating to the Senior Notes (the "Pricing Term Sheet"); any such free writing prospectus (which shall include the Pricing Term Sheet but shall not include a Limited Use Free Writing Prospectus), the use of which has been consented to by the Company and the Representatives, is listed on Schedule II-A hereto and herein called a "Permitted Free Writing Prospectus."

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company agrees to prepare the Pricing Term Sheet, which shall be previously approved by the Representatives, and to file the Pricing Term Sheet pursuant to Rule 433(d) under the 1933 Act within the time period prescribed by such Rule.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Underwriters have complied and will comply with the requirements of Rule 433 under the 1933 Act applicable to any free writing prospectus, including timely Commission filing where required and legending.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company agrees that if at any time following issuance of a Permitted Free Writing Prospectus or a Limited Use Free Writing Prospectus any event occurred or occurs as a result of which such Permitted Free Writing Prospectus or such Limited Use Free Writing Prospectus would conflict with the information in the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus or include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in light of the circumstances then prevailing, not misleading, the Company will give prompt notice thereof to the Representatives and, if requested by the Representatives, 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 Representatives, which will correct such conflict, statement or omission; provided, however, that this representation and warranty shall not apply to any statements or omissions in a Permitted Free Writing Prospectus or a Limited Use Free Writing Prospectus made in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company agrees that if there occurs an event or development as a result of which the Pricing Disclosure Package 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 light of the circumstances then prevailing, not misleading, the Company will notify the Representatives so that any use of the Pricing Disclosure Package may cease until it is amended or supplemented.

SECTION 4.&nbsp;&nbsp;&nbsp;&nbsp;<u>COVENANTS OF THE COMPANY</u>. The Company covenants with the Underwriters 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)&nbsp;&nbsp;&nbsp;&nbsp;The Company, on or prior to the Closing Date, will deliver to the Underwriters conformed copies of the Registration Statement as originally filed and of all amendments thereto, heretofore or hereafter made, including any post-effective amendment (in each case including all exhibits filed therewith, and including unsigned copies of each consent and certificate included therein or filed as an exhibit thereto, except exhibits incorporated by reference, unless specifically requested). As soon as the Company is advised thereof, it will advise the Representatives orally of the issuance of any stop order under the 1933 Act with respect to the

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Registration Statement, or the institution of any proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or related to the offering, of which the Company shall have received notice, and will use its best efforts to prevent the issuance of any such stop order and to secure the prompt removal thereof, if issued. The Company will deliver to the Representatives sufficient conformed copies of the Registration Statement, the Base Prospectus, the Pricing Prospectus and the Final Supplemented Prospectus and of all supplements and amendments thereto (in each case without exhibits) for distribution to the Underwriters and, from time to time, as many copies of the Base Prospectus, the Pricing Prospectus and the Final Supplemented Prospectus as the Underwriters may reasonably request for the purposes contemplated by the 1933 Act or the 1934 Act.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company will furnish the Underwriters with written or electronic copies of each amendment and supplement to the Final Supplemented Prospectus relating to the offering of the Senior Notes in such quantities as the Underwriters may from time to time reasonably request. If, during the period (not exceeding nine months) when the delivery of a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) shall be required by law in connection with the sale of any Senior Notes by an Underwriter, any event relating to or affecting the Company, or of which the Company shall be advised in writing by the Representatives, shall occur, which in the opinion of the Company or of Underwriters' counsel should be set forth in a supplement to or an amendment of the Final Supplemented Prospectus, as the case may be, in order to make the Final Supplemented Prospectus not misleading in light of the circumstances when it (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) is delivered, or if for any other reason it shall be necessary during such period to amend or supplement the Final Supplemented Prospectus or to file under the 1934 Act any document incorporated by reference in the Final Supplemented Prospectus in order to comply with the 1933 Act or the 1934 Act, the Company forthwith will (i) notify the Underwriters to suspend solicitation of purchases of the Senior Notes and (ii) at its expense, make any such filing or prepare and furnish to the Underwriters a reasonable number of copies of a supplement or supplements or an amendment or amendments to the Final Supplemented Prospectus which will supplement or amend the Final Supplemented Prospectus so that, as supplemented or amended, it will not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in light of the circumstances when the Final Supplemented Prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) is delivered, not misleading or which will effect any other necessary compliance. In case any Underwriter is required to deliver a prospectus in connection with the sale of any Senior Notes after the expiration of the period specified in the preceding sentence, the Company, upon the request of such Underwriter, will furnish to such Underwriter, at the expense of such Underwriter, a reasonable quantity of a supplemented or amended prospectus, or supplements or amendments to the Final Supplemented Prospectus, complying with Section 10(a) of the 1933 Act. During the period specified in the second sentence of this subsection, the Company will continue to prepare and file with the Commission on a timely basis all documents or amendments required under the 1934 Act and the rules and regulations thereunder; provided, that the Company shall not file such documents or amendments without also furnishing copies thereof prior to such filing to the Representatives and Hunton Andrews Kurth LLP.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company will endeavor, in cooperation with the Underwriters, to qualify the Senior Notes for offering and sale under the applicable securities laws of such states

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and the other jurisdictions of the United States as the Representatives may designate; <u>provided</u>, <u>however</u>, that the Company shall not be obligated to qualify as a foreign corporation in any jurisdiction in which it is not so qualified or to file a consent to service of process or to file annual reports or to comply with any other requirements in connection with such qualification deemed by the Company to be unduly burdensome.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company will make generally available to its security holders as soon as practicable but not later than 45 days after the close of the period covered thereby, an earnings statement of the Company (in form complying with the provisions of Rule 158 of the rules and regulations under the 1933 Act) covering a twelve-month period beginning not later than the first day of the Company's fiscal quarter next following the "effective date" (as defined in Rule 158) of the Registration Statement.

&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)&nbsp;&nbsp;&nbsp;&nbsp;As soon as practicable after the date of this Agreement, and in any event within the time prescribed by Rule 424 under the 1933 Act, the Company will file the Final Supplemented Prospectus, in a form approved by the Representatives, such approval not to be unreasonably withheld, with the Commission and will advise the Representatives of such filing and will confirm such advice in writing. Furthermore, the Company will make any other required filings pursuant to Rule 433(d)(1) under the 1933 Act within the time required by such Rule.

&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)&nbsp;&nbsp;&nbsp;&nbsp;During a period of 15 days from the date of this Agreement, the Company will not, without the Representatives' prior written consent, directly or indirectly, sell, offer to sell, grant any option for the sale of, or otherwise dispose of, any Senior Notes or any security convertible into or exchangeable into or exercisable for the Senior Notes or any debt securities substantially similar to the Senior Notes (except for the Senior Notes issued pursuant to this Agreement and the Company's proposed issuance of the Series 2025A Senior Notes). The Representatives agree that commercial paper or other debt securities with scheduled maturities of less than one year are not subject to this Section 4(f).

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company shall use the net proceeds received by it from the sale of the Senior Notes pursuant to this Agreement in the manner specified in the Pricing Prospectus under the caption "Use of Proceeds."

SECTION 5.&nbsp;&nbsp;&nbsp;&nbsp;<u>PAYMENT OF EXPENSES</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company will pay all expenses incidental to the performance of its obligations under this Agreement, including, but not limited to, the expenses of (i) the printing and filing of the Registration Statement as originally filed and of each amendment thereto, (ii) the preparation, issuance and delivery of the certificate(s) for the Senior Notes, (iii) the fees and disbursements of the Company's counsel and accountants, (iv) the qualification of the Senior Notes under securities laws in accordance with the provisions of Section 4(c) hereof, including filing fees and the reasonable fees and disbursements of Hunton Andrews Kurth LLP, counsel for the Underwriters, in connection therewith and in connection with the preparation of any blue sky survey (such fees and disbursements of counsel shall not exceed $3,500), (v) the printing and delivery to the Underwriters of copies of the Registration Statement as originally filed and of each amendment thereto and of the Pricing Prospectus, any Permitted Free Writing Prospectus, the Final Supplemented Prospectus and any amendments or supplements thereto, (vi) the printing and

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delivery to the Underwriters of copies of any blue sky survey, (vii) the fee of the Financial Industry Regulatory Authority, Inc. in connection with its review of the offering contemplated by this Agreement, if applicable, (viii) the fees and expenses of the Trustee, including the fees and disbursements of counsel for the Trustee in connection with the Indenture and the Senior Notes, (ix) any fees payable in connection with the rating of the Senior Notes, (x) the cost and charges of any transfer agent or registrar and (xi) the cost of qualifying the Senior Notes with The Depository Trust Company.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Except as otherwise provided in Section 10 hereof, the Underwriters shall pay all other expenses incurred by them in connection with their offering of the Senior Notes, including fees and disbursements of their counsel, Hunton Andrews Kurth LLP.

SECTION 6.&nbsp;&nbsp;&nbsp;&nbsp;<u>CONDITIONS OF UNDERWRITERS' OBLIGATIONS</u>. The obligations of the Underwriters to purchase and pay for the Senior Notes are subject to the following conditions:

&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)&nbsp;&nbsp;&nbsp;&nbsp;No stop order suspending the effectiveness of the Registration Statement shall be in effect on the Closing Date and no proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or related to the offering shall be pending before, or to the knowledge of the Company threatened by, the Commission on such date. If filing of the Pricing Prospectus or the Final Supplemented Prospectus, or any supplement thereto, is required pursuant to Rule 424, the Pricing Prospectus and the Final Supplemented Prospectus, and any such supplement, as applicable, shall have been filed in the manner and within the time period required by Rule 424. The pricing term sheet contemplated by Section 3(b) hereof, and any other material required to be filed by the Company pursuant to Rule 433(d) under the 1933 Act, shall have been filed by the Company with the Commission within the applicable time periods prescribed for such filings by Rule 433.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Any required orders of any applicable state commission or the Federal Energy Regulatory Commission permitting the transactions contemplated hereby substantially in accordance with the terms and conditions hereof shall be in full force and effect and shall contain no provision unacceptable to the Underwriters or the Company (but all provisions of such order or orders heretofore entered, copies of which have heretofore been delivered to the Representatives, are deemed acceptable to the Underwriters and the Company and all provisions of such order or orders hereafter entered shall be deemed acceptable to the Underwriters and the Company unless within 24 hours after receiving a copy of any such order any party to this Agreement shall give notice to the other parties to the effect that such order contains an unacceptable provision).

&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)&nbsp;&nbsp;&nbsp;&nbsp;On the Closing Date, the Representatives shall have received:

&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;(1)&nbsp;&nbsp;&nbsp;&nbsp;The opinion and related disclosure letter, each dated the Closing Date, of Troutman Pepper Locke LLP, counsel for the Company, substantially in the forms attached hereto as Schedule III.

&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;(2)&nbsp;&nbsp;&nbsp;&nbsp;The opinion, dated the Closing Date, of Emmet, Marvin & Martin, LLP, counsel to the Trustee, substantially in the form attached hereto as Schedule IV.

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&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;(3)&nbsp;&nbsp;&nbsp;&nbsp;The opinion and related disclosure letter, each dated the Closing Date, of Hunton Andrews Kurth LLP, counsel for the Underwriters, substantially in the forms attached hereto as Schedule V.

&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)&nbsp;&nbsp;&nbsp;&nbsp;At the Closing Date, there shall not have been, since the date hereof or since the respective dates as of which information is given in the Registration Statement and the Final Supplemented Prospectus, any material adverse change in the business, properties or financial condition of the Company, whether or not arising in the ordinary course of business, and the Representatives shall have received a certificate of the President or any Vice President of the Company, and dated as of the Closing Date, to the effect that (i) there has been no such material adverse change, (ii) the representations and warranties in Section 1 hereof are true and correct with the same force and effect as though expressly made at and as of the Closing Date, (iii) the Company has complied with all agreements and satisfied all conditions on its part to be performed or satisfied on or prior to the Closing Date and (iv) no stop order suspending the effectiveness of the Registration Statement has been issued and no proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or related to the offering have been initiated or, to the knowledge of the Company, threatened by the Commission.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Representatives shall have received on the date hereof and shall receive on the Closing Date from Deloitte & Touche LLP, a letter or letters addressed to the Representatives (which may refer to letters previously delivered to the Representatives) dated the respective dates of delivery thereof to the effect that: (A) they are an independent registered public accounting firm with respect to the Company within the meaning of the 1933 Act and the rules and regulations under the 1933 Act; (B) in their opinion, the financial statements audited by them and incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, comply as to form in all material respects with the applicable accounting requirements of the 1934 Act and the rules and regulations under the 1934 Act; and (C) on the basis of certain limited procedures performed through a specified date not more than three business days prior to the date of such letter, namely (i) reading the minute books of the Company; (ii) performing the procedures specified by the standards of the Public Company Accounting Oversight Board (United States) for a review of interim financial statement information as described in PCAOB AS 4105, "Reviews of Interim Financial Information" on the unaudited financial statements, if any, of the Company incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, and on the latest available unaudited financial statements of the Company, if any, for any calendar quarter subsequent to the date of those incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable; and (iii) making inquiries of certain officials of the Company who have responsibility for financial and accounting matters regarding such unaudited financial statements or any specified unaudited amounts derived therefrom (it being understood that the foregoing procedures do not constitute an audit performed in accordance with generally accepted auditing standards and they would not necessarily reveal matters of significance with respect to the comments made in such letter, and accordingly that Deloitte & Touche LLP make no representations as to the sufficiency of such procedures for the Underwriters' purposes), nothing came to their attention that caused them to believe that: (1) any material modifications should be made to the unaudited condensed financial statements, if any, incorporated by reference

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in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, for them to be in conformity with GAAP; (2) such unaudited condensed financial statements do not comply as to form in all material respects with the applicable accounting requirements of the 1934 Act as it applies to Form 10-Q and the related published rules and regulations thereunder; (3) the audited or unaudited amounts for Operating Revenues, Earnings Before Income Taxes and Net Income Attributable to Southern Power Company set forth in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, do not agree with the amounts set forth in or derived from the audited or unaudited financial statements of the Company for the same period included or incorporated by reference in the Registration Statement; (4) as of a specified date not more than three business days prior to the date of delivery of such letter, there has been any change in the capital stock or long-term debt of the Company or any decrease in net assets of the Company as compared with amounts shown in the latest audited or unaudited balance sheet incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, except in each case for changes or decreases which (i) the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, disclose, have occurred or may occur, (ii) are occasioned by the declaration of dividends, (iii) are occasioned by draw-downs and regularly scheduled payments of capitalized lease obligations, (iv) are occasioned by the purchase or redemption of bonds or stock to satisfy mandatory or optional redemption provisions relating thereto, (v) are occasioned by the reclassification of current maturities of long-term debt, (vi) are occasioned by the amortization of debt issuance costs, or (vii) are disclosed in such letter; and (5) the unaudited amounts for Operating Revenues, Earnings Before Income Taxes and Net Income Attributable to Southern Power Company for any calendar quarter subsequent to those set forth in (3) above, which, if available, shall be set forth in such letter, do not agree with the amounts set forth in or derived from the unaudited financial statements of the Company for the same period or were not determined on a basis substantially consistent with that of the corresponding audited amounts included or incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable.

&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)&nbsp;&nbsp;&nbsp;&nbsp;On the Closing Date, Hunton Andrews Kurth LLP, counsel for the Underwriters, shall have been furnished with such documents and opinions as it may reasonably require for the purpose of enabling it to pass upon the issuance and sale of the Senior Notes as herein contemplated and related proceedings, or in order to evidence the accuracy of any of the representations or warranties, or the fulfillment of any of the conditions, herein contained; and all proceedings taken by the Company in connection with the issuance and sale of the Senior Notes as herein contemplated shall be satisfactory in form and substance to the Representatives and Hunton Andrews Kurth LLP, counsel for the Underwriters.

&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)&nbsp;&nbsp;&nbsp;&nbsp;No amendment or supplement to the Registration Statement or the Final Supplemented Prospectus filed subsequent to the date of this Agreement (including any filing made by the Company pursuant to Section 13 or 14 of the 1934 Act) shall be unsatisfactory in form to Hunton Andrews Kurth LLP or shall contain information (other than with respect to an amendment or supplement relating solely to the activity of any Underwriter) which, in the

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reasonable judgment of the Representatives, shall materially impair the marketability of the Senior Notes.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company shall have performed its obligations when and as provided under this Agreement.

If any condition specified in this Section shall not have been fulfilled when and as required to be fulfilled, this Agreement may be terminated by the Representatives by notice to the Company at any time prior to the Closing Date, and such termination shall be without liability of any party to any other party except as provided in Sections 5, 8 and 10(b) hereof.

SECTION 7.&nbsp;&nbsp;&nbsp;&nbsp;<u>CONDITIONS OF THE OBLIGATIONS OF THE COMPANY</u>.

The obligations of the Company shall be subject to the conditions set forth in the first sentence of Section 6(a) and in Section 6(b) hereof. In case such conditions shall not have been fulfilled, this Agreement may be terminated by the Company by mailing or delivering written notice thereof to the Representatives. Any such termination shall be without liability of any party to any other party except as otherwise provided in Sections 5, 8 and 10(b) hereof.

SECTION 8.&nbsp;&nbsp;&nbsp;&nbsp;<u>INDEMNIFICATION</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company agrees to indemnify and hold harmless each of the Underwriters and each person, if any, who controls any such Underwriter within the meaning of Section 15 of the 1933 Act or Section 20(a) of the 1934 Act, against any and all losses, claims, damages or liabilities, joint or several, to which they or any of them may become subject under the 1933 Act, the 1934 Act or otherwise, and to reimburse any such Underwriter and such controlling person or persons, if any, for any legal or other expenses incurred by them in connection with defending any actions, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in a Limited Use Free Writing Prospectus, any Preliminary Prospectus, the Registration Statement, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus or the Final Supplemented Prospectus or, if the Company shall furnish to the Underwriters any amendments or any supplements thereto, or shall make any filings pursuant to Section 13 or 14 of the 1934 Act which are incorporated therein by reference, in a Limited Use Free Writing Prospectus, any Preliminary Prospectus, the Registration Statement, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus, the Final Supplemented Prospectus as so amended or supplemented, or in any free writing prospectus used by the Company other than a Permitted Free Writing Prospectus or a Limited Use Free Writing Prospectus, or arise out of or are based upon any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any such untrue statement or alleged untrue statement or omission or alleged omission which was made in such Limited Use Free Writing Prospectus, Preliminary Prospectus, Registration Statement, Base Prospectus, Pricing Prospectus, Permitted Free Writing Prospectus or Final Supplemented Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives for use therein. Each Underwriter agrees, within ten days after the receipt by it of notice of the commencement of any

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action in respect of which indemnity may be sought by it, or by any person controlling it, from the Company on account of its agreement contained in this Section 8, to notify the Company in writing of the commencement thereof but the omission of such Underwriter so to notify the Company of any such action shall not release the Company from any liability which it may have to such Underwriter or to such controlling person otherwise than on account of the indemnity agreement contained in this Section 8. In case any such action shall be brought against an Underwriter or any such person controlling such Underwriter and such Underwriter shall notify the Company of the commencement thereof as above provided, the Company shall be entitled to participate in (and, to the extent that it shall wish, including the selection of counsel, to direct) the defense thereof, at its own expense. In case the Company elects to direct such defense and select such counsel, any Underwriter or controlling person shall have the right to employ its own counsel, but, in any such case, the fees and expenses of such counsel shall be at the expense of such Underwriter or such controlling person unless the employment of such counsel has been authorized in writing by the Company in connection with defending such action. No indemnifying party shall, without the written consent of the indemnified party, effect the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim in respect of which indemnification may be sought hereunder (whether or not the indemnified party is an actual or potential party to such action or claim) unless such settlement, compromise or judgment (i) includes an unconditional release of the indemnified party from all liability arising out of such action or claim and (ii) does not include any statement as to, or an admission of, fault, culpability or a failure to act, by or on behalf of any indemnified party. In no event shall any indemnifying party have any liability or responsibility in respect of the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim effected without its prior written consent.

&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)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter, severally and not jointly, agrees to indemnify and hold harmless the Company, its directors and such of its officers who have signed the Registration Statement and each person, if any, who controls the Company within the meaning of Section 15 of the 1933 Act or Section 20(a) of the 1934 Act to the same extent and upon the same terms as the indemnity agreement of the Company set forth in Section 8(a) hereof, but only with respect to alleged untrue statements or omissions made in a Limited Use Free Writing Prospectus, the Registration Statement, the Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus or the Final Supplemented Prospectus, or such documents as amended or supplemented, in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives for use therein.

SECTION 9.&nbsp;&nbsp;&nbsp;&nbsp;<u>REPRESENTATIONS, WARRANTIES AND AGREEMENTS TO SURVIVE DELIVERY</u>.

All representations, warranties and agreements contained in this Agreement, or contained in certificates of officers of the Company submitted pursuant hereto, shall remain operative and in full force and effect, regardless of any investigation made by or on behalf of any Underwriter or controlling person, or by, or on behalf of the Company and shall survive delivery of the Senior Notes to the Underwriters.

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SECTION 10.&nbsp;&nbsp;&nbsp;&nbsp;<u>TERMINATION OF AGREEMENT</u>.

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Representatives may terminate this Agreement, by notice to the Company, at any time at or prior to the Closing Date if (i) trading in securities on the New York Stock Exchange shall have been generally suspended or there shall have been a material disruption in settlement in securities generally, (ii) minimum or maximum ranges for prices shall have been generally established on the New York Stock Exchange by the Commission or by the New York Stock Exchange, (iii) a general banking moratorium shall have been declared by federal or New York State authorities, or (iv) there shall have occurred any outbreak or escalation of major hostilities in which the United States is involved, any declaration of war by the United States Congress or any other substantial national or international calamity, crisis or emergency (including, without limitation, acts of terrorism) affecting the United States, in any such case provided for in clauses (i) through (iv) with the result that, in the reasonable judgment of the Representatives, the offering, sale or delivery of the Senior Notes on the terms and in the manner contemplated by this Agreement and the Final Supplemented Prospectus shall have been materially impaired.

&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)&nbsp;&nbsp;&nbsp;&nbsp;If this Agreement shall be terminated by the Representatives pursuant to subsection (a) above or because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement, then in any such case, the Company will reimburse the Underwriters for the reasonable fees and disbursements of Hunton Andrews Kurth LLP and for the out of pocket expenses (in an amount not exceeding $10,000) reasonably incurred by the Underwriters in making preparations for the purchase, sale and delivery of the Senior Notes and, upon such reimbursement, the Company shall be absolved from any further liability hereunder, except as provided in Sections 5 and 8 hereof.

SECTION 11.&nbsp;&nbsp;&nbsp;&nbsp;<u>DEFAULT BY AN UNDERWRITER</u>.

If an Underwriter shall fail on the Closing Date to purchase the Senior Notes that it is obligated to purchase under this Agreement (the "Defaulted Securities"), the Representatives shall have the right, within 24 hours thereafter, to make arrangements for one or more of the non-defaulting Underwriters, or any other underwriters, to purchase all, but not less than all, of the Defaulted Securities in such amounts as may be agreed upon and upon the terms herein set forth. If, however, the Representatives shall not have completed such arrangements within such 24-hour period, then:

&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)&nbsp;&nbsp;&nbsp;&nbsp;if the principal amount of Defaulted Securities does not exceed 10% of the Senior Notes, each of the non-defaulting Underwriters shall be obligated, severally and not jointly, to purchase the full amount thereof in the proportions that their respective underwriting obligations hereunder bear to the underwriting obligations of all non-defaulting Underwriters, 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;(b)&nbsp;&nbsp;&nbsp;&nbsp;if the principal amount of Defaulted Securities exceeds 10% of the Senior Notes, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

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No action taken pursuant to this Section shall relieve any defaulting Underwriter from liability in respect of its default.

In the event of any such default which does not result in a termination of this Agreement, either the Representatives or the Company shall have the right to postpone the Closing Date for a period not exceeding seven days in order to effect any required changes in the Registration Statement, the Pricing Prospectus or the Final Supplemented Prospectus or in any other documents or arrangements.

SECTION 12.&nbsp;&nbsp;&nbsp;&nbsp;<u>NOTICES</u>. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted by any standard form of telecommunication. Notices to the Underwriters shall be directed to the Representatives at BMO Capital Markets Corp., 151 West 42nd Street, New York, New York 10036, Attention: Legal Department, Fax No.: (212) 702-1205; Mizuho Securities USA LLC, 1271 Avenue of the Americas, New York, New York 10020, Attention: Debt Capital Markets, BA_DCM_Notices@mizuhogroup.com; PNC Capital Markets LLC, 300 Fifth Avenue, 10th Floor, Pittsburgh, Pennsylvania 15222, Attention: Debt Capital Markets, Fixed Income Transaction Execution, capitalmarketsnotices@pnc.com and SMBC Nikko Securities America, Inc., 277 Park Avenue, 5th Floor, New York, New York 10172, Attention: Debt Capital Markets, email NikkoGCNotices@smbcnikko-si.com; notices to the Company shall be mailed to 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308, Attention: Corporate Secretary, with a copy to Southern Company Services, Inc., 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308, Attention: J. Seth Blocker.

SECTION 13.&nbsp;&nbsp;&nbsp;&nbsp;<u>PARTIES</u>. This Agreement shall inure to the benefit of and be binding upon the Underwriters, 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 Underwriters and the Company and their respective successors and the controlling persons and officers and directors referred to in Section 8 and their 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 are intended to be for the sole and exclusive benefit of the Underwriters and the Company and their respective successors, and said controlling persons and officers and directors and their heirs and legal representatives, and for the benefit of no other person, firm or corporation. No purchaser of Senior Notes from any of the Underwriters shall be deemed to be a successor by reason merely of such purchase. The Company acknowledges and agrees that in connection with all aspects of each transaction contemplated by this Agreement, the Company and the Underwriters have arms-length business relationships that create no fiduciary duty on the part of any party and each expressly disclaims any fiduciary or financial advisory relationship.

SECTION 14.&nbsp;&nbsp;&nbsp;&nbsp;<u>GOVERNING LAW AND TIME</u>. This Agreement shall be governed by and construed in accordance with the laws of the State of New York applicable to agreements made and to be performed in said State. Except as otherwise set forth herein, specified times of day refer to New York time.

SECTION 15.&nbsp;&nbsp;&nbsp;&nbsp;<u>COUNTERPARTS</u>. This Agreement may be executed by any one or more of the parties hereto in any number of counterparts by manual, facsimile or electronic

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signature, each of which shall be deemed to be an original, but all such respective counterparts shall together constitute one and the same instrument. The words "execution," "signed," "delivery," and words of like import in or relating to this Agreement or any document to be signed in connection with this Agreement shall be deemed to include electronic signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means.

SECTION 16.&nbsp;&nbsp;&nbsp;&nbsp;<u>RECOGNITION OF THE U.S. SPECIAL RESOLUTION REGIMES.</u>

&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)&nbsp;&nbsp;&nbsp;&nbsp;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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;&nbsp;&nbsp;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.

"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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;&nbsp;&nbsp;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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;&nbsp;&nbsp;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.

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If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument, along with all counterparts, will become a binding agreement among the Underwriters and the Company in accordance with its terms.

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Very truly yours,

SOUTHERN POWER COMPANY

By: <u>/s/ Jon P. Haygood</u>

Name: Jon P. Haygood

Title: Assistant Treasurer

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CONFIRMED AND ACCEPTED,

as of the date first above written

BMO CAPITAL MARKETS CORP.

By: <u>/s/ Mark Spadaccini</u>

Name: Mark Spadaccini

Title: Managing Director

MIZUHO SECURITIES USA LLC

By: <u>/s/ Stephen E. Leamer</u> 

Name: Stephen E. Leamer

Title: Managing Director

PNC CAPITAL MARKETS LLC

By: <u>/s/ Valerie Shadeck</u> 

Name: Valerie Shadeck

Title: Managing Director

SMBC NIKKO SECURITIES AMERICA, INC.

By: <u>/s/ Amanda Boggs</u>

Name: Amanda Boggs

Title: Managing Director

As Representatives of the Several Underwriters named in Schedule I hereto

[Signature Page to 2025B Underwriting Agreement]

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**SCHEDULE I**

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| | |
|:---|:---|
| | Principal Amount of Series 2025B |
| Name of Underwriters | Senior Notes |
| BMO Capital Markets Corp. | $82500000 |
| Mizuho Securities USA LLC | 82500000 |
| PNC Capital Markets LLC | 82500000 |
| SMBC Nikko Securities America, Inc. | 82500000 |
| Santander US Capital Markets LLC | 38500000 |
| BBVA Securities Inc. | 30250000 |
| BNY Mellon Capital Markets, LLC | 30250000 |
| CIBC World Markets Corp. | 30250000 |
| Huntington Securities, Inc. | 30250000 |
| Intesa Sanpaolo IMI Securities Corp. | 30250000 |
| TD Securities (USA) LLC | 30250000 |
|  | ___________ |
| TOTAL: | $550000000 |

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&nbsp;&nbsp;&nbsp;&nbsp;Schedule I-1

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**SCHEDULE II-A**

**PRICING DISCLOSURE PACKAGE**

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| | |
|:---|:---|
| 1) | Prospectus dated August 8, 2025 |
| 2) | Preliminary Prospectus Supplement dated September 16, 2025 (which shall be deemed to <br>include documents incorporated by reference therein) |
| 3) | Permitted Free Writing Prospectuses |
| | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a)&nbsp;&nbsp;&nbsp;&nbsp; Pricing Term Sheet |

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&nbsp;&nbsp;&nbsp;&nbsp;Schedule II-A-1

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**SCHEDULE II-B**

**LIMITED USE FREE WRITING PROSPECTUS**

1)&nbsp;&nbsp;&nbsp;&nbsp;Investor Presentation Slideshow, dated September 15, 2025

2)&nbsp;&nbsp;&nbsp;&nbsp;Investor Presentation Slideshow, dated September 16, 2025

&nbsp;&nbsp;&nbsp;&nbsp;Schedule II-B-1

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Schedule III

[Letterhead of TROUTMAN PEPPER LOCKE LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the Several Underwriters

SOUTHERN POWER COMPANY<br>Series 2025B 4.90% Senior Notes<br>due October 1, 2035

To the Addressees:

We have acted as counsel to Southern Power Company (the "Company") in connection with (i) the Company's issuance of $550,000,000 aggregate principal amount of its Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Notes") pursuant to a Senior Note Indenture dated as of August 1, 2025, by and between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as heretofore supplemented and as further supplemented by the Second Supplemental Indenture dated as of September 19, 2025 (collectively, the "Indenture"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 16, 2025, (the "Underwriting Agreement"), among the Company and the Underwriters named in Schedule I thereto (the "Underwriters") for whom you are acting as representatives (the "Representatives"). This opinion is being delivered to you as Representatives pursuant to Section 6(c)(1) of the Underwriting Agreement.

All capitalized terms not otherwise defined herein shall have the meanings set forth in the Underwriting Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-1

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In rendering the opinions expressed below, we have examined the following documents:

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's registration statement on Form S-3 (File No. 333-289172) pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement");

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's prospectus dated August 8, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act;

&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)&nbsp;&nbsp;&nbsp;&nbsp;The documents incorporated by reference into the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus (as hereinafter defined): the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2024 and the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2025 and June 30, 2024 (together, the "Pricing Exchange Act Documents");

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated September 16, 2025 (the "Exchange Act Documents"), each as filed under the Securities Exchange Act of 1934, as amended (the "Exchange Act");

&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)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Indenture;

&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)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Underwriting Agreement;

&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)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus pertaining to the Notes prepared by the Company and filed with the Commission on September 16, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus"); and

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's Certificate of Incorporation and By-Laws.

The documents listed in Schedule II-A to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

In addition, we have examined, and have relied as to factual matters upon, the documents delivered to you at the closing (except the certificates representing the Notes, of which we have examined specimens), and we have made such other and further investigations as we deemed necessary to express the opinions hereinafter set forth. In such examination, we have assumed (i) the genuineness of all signatures, (ii) the legal capacity of natural persons, (iii) the authenticity of all documents submitted to us as originals, and (iv) the conformity to original

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-2

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documents of all documents submitted to us as certified or photostatic copies and the authenticity of the originals of such latter documents.

The Indenture and the Underwriting Agreement are herein referred to collectively as the "Agreements."

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion 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;1.&nbsp;&nbsp;&nbsp;&nbsp;The Company has been duly organized and is validly existing and in good standing as a corporation under the laws of the State of Delaware and has due corporate authority to conduct its business, to own and operate the properties used by it in such business and to enter into and perform its obligations under the Agreements and the Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;&nbsp;&nbsp;&nbsp;The execution, delivery and performance by the Company of the Underwriting Agreement have been duly authorized by all necessary corporate action, and the Underwriting Agreement has been duly executed and delivered by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;&nbsp;&nbsp;&nbsp;All orders, consents or other authorizations or approvals of the Federal Energy Regulatory Commission and the Commission legally required for the issuance and sale of the Notes have been obtained; such orders are sufficient for the issuance and sale of the Notes; the issuance and sale of the Notes conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval pursuant to the Delaware General Corporation Law or of the State of Georgia or any United States governmental body (other than in connection or in compliance with the provisions of the securities or "blue sky" laws of any jurisdiction, as to which we express no opinion) is legally required for the issuance and sale of the Notes in accordance with the terms of the Underwriting Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized, executed and delivered by the Company and, assuming the due authorization, execution and delivery thereof by the Trustee, constitutes a valid and legally binding instrument of the Company, enforceable against the Company in accordance with its terms, subject to the qualifications that the enforceability of the Company's obligations under the Indenture may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;&nbsp;&nbsp;&nbsp;The Notes have been duly authorized and executed by the Company and, when authenticated by the Trustee in the manner provided in the Indenture and delivered to and paid for by the Underwriters pursuant to the Underwriting Agreement, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, subject to the qualifications that the enforceability of the Company's obligations under the Notes may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law).

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-3

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.&nbsp;&nbsp;&nbsp;&nbsp;Each of the Indenture and the Notes conforms as to legal matters in all material respects to the descriptions thereof in the Pricing Disclosure Package and the Final Supplemented Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly qualified under the Trust Indenture Act of 1939, as amended.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Company of the Underwriting Agreement, the Indenture and the Notes, and the consummation of the transactions contemplated thereby, do not result in any violation of (i) the Certificate of Incorporation or By-Laws of the Company or (ii) the Delaware General Corporation Law or any existing applicable law, rule or regulation of the State of New York.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.&nbsp;&nbsp;&nbsp;&nbsp;The statements set forth in the Pricing Disclosure Package and the Final Supplemented Prospectus under the heading "Material United States Federal Income Tax Considerations for Non-United States Holders" insofar as they purport to constitute summaries of matters of United States federal income tax law constitute accurate summaries in all material respects subject to the qualifications set forth therein.

We do not purport to express any opinion herein concerning any law other than the laws of the State of Georgia, the federal law of the United States, the Delaware General Corporation Law and, to the extent set forth herein, the laws of the State of New York. As to all matters governed by or dependent upon the laws of the State of New York, we have, with your consent, relied upon the opinion of Hunton Andrews Kurth LLP dated the date hereof and addressed to you.

This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent. This opinion letter is expressed as of the date hereof, and we do not assume any obligation to update or supplement it to reflect any fact or circumstance that hereafter comes to our attention, or any change in law that hereafter occurs.

Yours very truly,

TROUTMAN PEPPER LOCKE LLP

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-4

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[Letterhead of TROUTMAN PEPPER LOCKE LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the Several Underwriters

SOUTHERN POWER COMPANY<br>Series 2025B 4.90% Senior Notes<br>due October 1, 2035

To the Addressees:

We have acted as counsel to Southern Power Company (the "Company") in connection with (i) the Company's issuance of $550,000,000 aggregate principal amount of its Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Notes") pursuant to a Senior Note Indenture dated as of August 1, 2025, by and between the Company and U.S. Bank Trust Company, National Association, as trustee, as heretofore supplemented and as further supplemented by the Second Supplemental Indenture dated as of September 19, 2025; and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 16, 2025 (the "Underwriting Agreement"), among the Company and the Underwriters named in Schedule I thereto (the "Underwriters") for whom you are acting as representatives (the "Representatives"). This letter is being delivered to you as Representatives pursuant to Section 6(c)(1) of the Underwriting Agreement.

All capitalized terms not otherwise defined herein shall have the meanings set forth in the Underwriting Agreement.

In the above capacity, we have examined the Company's registration statement on Form S-3 (File No. 333-289172) pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement"); the Company's prospectus dated August 8, 2025 (the "Base

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-5

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Prospectus"), as supplemented by a preliminary prospectus supplement pertaining to the Notes dated September 16, 2025 (the "Pricing Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act which, pursuant to Form S-3, incorporates by reference the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2024 and the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2025 and June 30, 2025 (together, the "Pricing Exchange Act Documents"), and a prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated September 16, 2025 (the "Exchange Act Documents"), each as filed under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). We have also examined the free writing prospectus pertaining to the Notes prepared by the Company and filed with the Commission on September 16, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus"). The documents listed in Schedule II-A to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

We have participated in various conferences with the Company, its representatives, representatives of the independent public or certified public accountants of the Company and your counsel at which the contents of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents and related matters were discussed and reviewed. Because of the inherent limitations in the independent verification of factual matters, and the character of the determinations involved in the preparation of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents, we are not passing upon and do not assume any responsibility for, and make no representation that we have independently verified, the accuracy, completeness or fairness of the statements contained therein (other than as specified in opinion paragraphs 6 and 9 of our opinion to you related to the Indenture and the Notes and the matters of United States federal income tax law dated of even date herewith). However, on the basis of the foregoing, we advise you that nothing has come to our attention which has caused us to believe 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;(i)&nbsp;&nbsp;&nbsp;&nbsp;the Registration Statement, on the Effective Date (including the Exchange Act Documents on file with the Commission as of such date), contained any untrue statement of a material fact or omitted to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading,

&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)&nbsp;&nbsp;&nbsp;&nbsp;the Pricing Disclosure Package (including the Pricing Exchange Act Documents), as of the Applicable Time, included an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading, 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)&nbsp;&nbsp;&nbsp;&nbsp;the Final Supplemented Prospectus (including the Exchange Act Documents) contained, as of its date, or contains, on the date hereof, any untrue statement of a material fact or omitted, as of its date, or omits, on the date hereof, to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading,

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-6

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except that in each case we express no belief with respect to the financial statements and schedules and notes thereto or other financial or statistical data contained or incorporated by reference in (or omitted from) the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus or the Exchange Act Documents and with respect to information set forth in the Pricing Prospectus and the Final Supplemented Prospectus under the captions "Description of the Series 2025B Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company" and "Description of the Series 2025B Senior Notes ─ Global Clearance and Settlement Procedures."

Subject to and on the basis of the foregoing, we further advise you that the Registration Statement, on the Effective Date, and the Final Supplemented Prospectus, as of September 16, 2025, complied as to form in all material respects with the relevant requirements of the Act and the applicable rules and regulations of the Commission thereunder and that each Exchange Act Document, as of its date of filing with the Commission, complied as to form in all material respects with the relevant requirements of the Exchange Act and the applicable rules and regulations of the Commission thereunder, except that in each case we express no belief as to the financial statements and schedules and notes thereto or other financial or statistical data contained or incorporated by reference in (or omitted from) the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus or the Exchange Act Documents.

This letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent. This letter is expressed as of the date hereof, and we do not assume any obligation to update or supplement it to reflect any fact or circumstance that hereafter comes to our attention or any change in law that hereafter occurs.

Yours very truly,

TROUTMAN PEPPER LOCKE LLP

&nbsp;&nbsp;&nbsp;&nbsp;Schedule III-7

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Schedule IV

[Letterhead of EMMET, MARVIN & MARTIN, LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the several Underwriters

Southern Power Company

30 Ivan Allen Jr. Blvd., N.W.

Atlanta, Georgia 30308

SOUTHERN POWER COMPANY<br>Series 2025B 4.90% Senior Notes due October 1, 2035

Ladies and Gentlemen:

We have acted as counsel for U.S. Bank Trust Company, National Association ("U.S. Bank Trust Company"), in connection with the issuance by Southern Power Company (the "Company") of $550,000,000 aggregate principal amount of Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Notes"). The Notes are being issued under the Senior Note Indenture, dated as of August 1, 2025 (the "Original Indenture"), between the Company and U.S. Bank Trust Company, as trustee (in such capacity, the "Trustee"), as heretofore supplemented and as further supplemented by the Second Supplemental Indenture, dated as of September 19, 2025 (the "Supplemental Indenture" and, together with the Original Indenture, the "Indenture"), between the Company and the Trustee.

For purposes of this opinion, we have reviewed the Indenture and such other documents, records and papers, and satisfied ourselves as to such other matters, as we have deemed necessary or appropriate for this opinion. As to questions of fact material to this opinion, we have relied on certificates of U.S. Bank Trust Company and of public officials. In such review, we have

&nbsp;&nbsp;&nbsp;&nbsp;Schedule IV-1

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assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to us as originals, the conformity to the originals of all documents submitted to us as copies or forms and the authenticity of the originals of such latter documents. We have assumed that U.S. Bank Trust Company has been duly formed and that the Indenture has been duly authorized, executed and delivered by the Company and constitutes the valid and binding agreement of, and is enforceable in accordance with its terms against, the Company.

Based upon the foregoing and subject to the qualifications below, we are of the opinion that:

1)&nbsp;&nbsp;&nbsp;&nbsp;Based solely on a certificate from the Comptroller of the Currency, U.S. Bank Trust Company is a national banking association formed under the laws of the United States and is authorized thereunder to transact the business of banking and exercise fiduciary powers and perform its obligations under the Indenture.

2)&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized, executed and delivered by U.S. Bank Trust Company and the Indenture constitutes a valid and binding agreement of U.S. Bank Trust Company enforceable against U.S. Bank Trust Company in accordance with its terms, except as may be limited by bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and general equitable principles (whether considered in a proceeding in equity or at law) and by an implied covenant of reasonableness, good faith and fair dealing.

We are members of the Bar of the State of New York and, for purposes of this opinion, do not hold ourselves out as experts on the laws of any jurisdiction other than the State of New York and the federal law of the United States. The opinions expressed herein are limited to matters of law solely on applicable provisions of the following, as currently in effect: (i) as to the opinions expressed in paragraphs (1) and (2), the National Bank Act and the regulations of the Office of the Comptroller of the Currency published in 12 C.F.R. Parts 1-199 and (ii) as to the opinion expressed in paragraph (2), subject to the exclusions and limitations set forth in this opinion letter, internal New York law.

This opinion is solely for your benefit in connection with the issuance and sale by the Company of the Notes and may not be relied upon by you for any other purpose, or relied upon or furnished to any other person, without our prior written consent, except that copies of this opinion may be furnished to, but not relied upon by, (i) your independent auditors, advisors and legal counsel, or (ii) any person in order to comply with any subpoena, order, regulation, ruling or request of any judicial, administrative, governmental, supervisory or legislative body or committee or any self-regulatory body.

Very truly yours,

&nbsp;&nbsp;&nbsp;&nbsp;Schedule IV-2

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Schedule V

[Letterhead of HUNTON ANDREWS KURTH LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the Several Underwriters

SOUTHERN POWER COMPANY<br>Series 2025B 4.90% Senior Notes<br>due October 1, 2035

To the Addressees:

We have represented the Underwriters (as hereinafter defined) in connection with (i) the issuance and sale by Southern Power Company (the "Company") of $550,000,000 aggregate principal amount of its Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Notes") pursuant to a Senior Note Indenture, dated as of August 1, 2025, by and between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as heretofore supplemented and as further supplemented by the Second Supplemental Indenture, dated as of September 19, 2025 (collectively, the "Indenture"); and (ii) the purchase by the Underwriters of the Notes pursuant to the terms of an Underwriting Agreement, dated September 16, 2025 (the "Underwriting Agreement"), among the Company and the Underwriters named in Schedule I thereto (the "Underwriters") for whom you are acting as representatives (the "Representatives"). This opinion letter is being delivered to you in your capacity as Representatives pursuant to Section 6(c)(3) of the Underwriting Agreement.

All capitalized terms not otherwise defined herein shall have the meanings set forth in the Underwriting Agreement.

Schedule V-1

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In rendering the opinions expressed below, we have examined the following documents:

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's registration statement on Form S-3 (File No. 333-289172) pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement");

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's prospectus dated August 8, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act;

&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)&nbsp;&nbsp;&nbsp;&nbsp;The documents incorporated by reference into the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus (as hereinafter defined): the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2024 and the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2025 and June 30, 2025 (together, the "Pricing Exchange Act Documents");

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated September 16, 2025 (the "Exchange Act Documents"), each as filed under the Securities Exchange Act of 1934, as amended (the "Exchange Act");

&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)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Indenture;

&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)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Underwriting Agreement;

&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)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus pertaining to the Notes prepared by the Company and filed with the Commission on September 16, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus"); and

&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)&nbsp;&nbsp;&nbsp;&nbsp;The Company's Certificate of Incorporation and By-Laws.

The documents listed in Schedule II-A to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

In addition, we have examined, and have relied as to factual matters upon, the documents delivered to you at the closing (except the certificates representing the Notes, of which we have examined specimens), and we have made such other and further investigations as we deemed necessary to express the opinions hereinafter set forth. In such examination, we have assumed (i) the genuineness of all signatures, (ii) the legal capacity of natural persons, (iii) the authenticity of all documents submitted to us as originals, and (iv) the conformity to original

Schedule V-2

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documents of all documents submitted to us as certified or photostatic copies and the authenticity of the originals of such latter documents.

The Indenture and the Underwriting Agreement are herein referred to collectively as the "Agreements."

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion 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;1.&nbsp;&nbsp;&nbsp;&nbsp;The Company has been duly organized and is validly existing and in good standing as a corporation under the laws of the State of Delaware and has due corporate authority to conduct its business, to own and operate the properties used by it in such business and to enter into and perform its obligations under the Agreements and the Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;&nbsp;&nbsp;&nbsp;The execution, delivery and performance by the Company of the Underwriting Agreement have been duly authorized by all necessary corporate action, and the Underwriting Agreement has been duly executed and delivered by the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;&nbsp;&nbsp;&nbsp;All orders, consents or other authorizations or approvals of the Federal Energy Regulatory Commission and the Commission legally required for the issuance and sale of the Notes have been obtained; such orders are sufficient for the issuance and sale of the Notes; the issuance and sale of the Notes conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval pursuant to the Delaware General Corporation Law or of any New York or any United States governmental body (other than in connection or in compliance with the provisions of the securities or "blue sky" laws of any jurisdiction, as to which we express no opinion) is legally required for the issuance and sale of the Notes in accordance with the terms of the Underwriting Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized, executed and delivered by the Company and, assuming the due authorization, execution and delivery thereof by the Trustee, constitutes a valid and legally binding instrument of the Company, enforceable against the Company in accordance with its terms, subject to the qualifications that the enforceability of the Company's obligations under the Indenture may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;&nbsp;&nbsp;&nbsp;The Notes have been duly authorized and executed by the Company and, when authenticated by the Trustee in the manner provided in the Indenture and delivered to and paid for by the Underwriters pursuant to the Underwriting Agreement, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, subject to the qualifications that the enforceability of the Company's obligations under the Notes may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law).

Schedule V-3

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.&nbsp;&nbsp;&nbsp;&nbsp;Each of the Indenture and the Notes conforms as to legal matters in all material respects to the descriptions thereof in the Pricing Disclosure Package and the Final Supplemented Prospectus.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly qualified under the Trust Indenture Act of 1939, as amended.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Company of the Agreements and the Notes, and the consummation of the transactions contemplated thereby, do not result in any violation of (i) the Certificate of Incorporation or By-Laws of the Company or (ii) the Delaware General Corporation Law or any existing applicable law, rule or regulation of the State of New York.

We do not purport to express any opinion herein concerning any law other than the law of the State of New York, the federal law of the United States and the Delaware General Corporation Law.

This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent except that Troutman Pepper Locke LLP may rely on this opinion letter in giving its opinions pursuant to Section 6 of the Underwriting Agreement and Sections 102, 302 and 904 of the Indenture, insofar as such opinions relate to matters of New York law. This opinion letter is expressed as of the date hereof, and we do not assume any obligation to update or supplement it to reflect any fact or circumstance that hereafter comes to our attention, or any change in law that hereafter occurs.

Very truly yours,

HUNTON ANDREWS KURTH LLP

Schedule V-4

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[Letterhead of HUNTON ANDREWS KURTH LLP]

September 19, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

Mizuho Securities USA LLC

1271 Avenue of the Americas

New York, New York 10020

PNC Capital Markets LLC<br>300 Fifth Avenue, 10th Floor<br>Pittsburgh, Pennsylvania 15222

SMBC Nikko Securities America, Inc.

277 Park Avenue

New York, New York 10172

As Representatives of the Several Underwriters

SOUTHERN POWER COMPANY<br>Series 2025B 4.90% Senior Notes<br>due October 1, 2035

To the Addressees:

We have represented the Underwriters (as hereinafter defined) in connection with (i) the issuance and sale by Southern Power Company (the "Company") of $550,000,000 aggregate principal amount of its Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Notes") pursuant to a Senior Note Indenture, dated as of August 1, 2025, by and between the Company and U.S. Bank Trust Company, National Association, as trustee, as heretofore supplemented and as further supplemented by the Second Supplemental Indenture, dated as of September 19, 2025; and (ii) the purchase by the Underwriters of the Notes pursuant to the terms of an Underwriting Agreement, dated September 16, 2025 (the "Underwriting Agreement"), among the Company and the Underwriters named in Schedule I thereto (the "Underwriters") for whom you are acting as representatives (the "Representatives"). This letter is being delivered to you as Representatives pursuant to Section 6(c)(3) of the Underwriting Agreement.

All capitalized terms not otherwise defined herein shall have the meanings set forth in the Underwriting Agreement.

In the above capacity, we have examined the Company's registration statement on Form S-3 (File No. 333-289172) pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement"); the Company's prospectus dated August 8, 2025 (the "Base

Schedule V-5

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Prospectus"), as supplemented by a preliminary prospectus supplement pertaining to the Notes dated September 16, 2025 (the "Pricing Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act which, pursuant to Form S-3, incorporates by reference the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2024 and the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2025 and June 30, 2025 (together, the "Pricing Exchange Act Documents"), and a prospectus supplement pertaining to the Notes dated September 16, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated September 16, 2025 (the "Exchange Act Documents"), each as filed under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). We have also examined the free writing prospectus pertaining to the Notes prepared by the Company and filed with the Commission on September 16, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus"). The documents listed in Schedule II-A to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

We have participated in various conferences with the Company, its counsel, its representatives and representatives of the independent public or certified public accountants of the Company at which the contents of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents and related matters were discussed and reviewed. Because of the inherent limitations in the independent verification of factual matters, and the character of the determinations involved in the preparation of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents, we are not passing upon and do not assume any responsibility for, and make no representation that we have independently verified, the accuracy, completeness or fairness of the statements contained therein (other than as specified in opinion paragraph 6 of our opinion letter to you related to the Indenture and the Notes dated of even date herewith). However, on the basis of the foregoing, we advise you that nothing has come to our attention which has caused us to believe 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;(i)&nbsp;&nbsp;&nbsp;&nbsp;the Registration Statement, on the Effective Date (including the Exchange Act Documents on file with the Commission as of such date), contained any untrue statement of a material fact or omitted to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading,

&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)&nbsp;&nbsp;&nbsp;&nbsp;the Pricing Disclosure Package (including the Pricing Exchange Act Documents), as of the Applicable Time, included an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading, 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)&nbsp;&nbsp;&nbsp;&nbsp;the Final Supplemented Prospectus (including the Exchange Act Documents) contained, as of its date, or contains, on the date hereof, any untrue statement of a material fact or omitted, as of its date, or omits, on the date hereof, to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading,

Schedule V-6

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except that in each case we express no belief with respect to the financial statements and schedules and notes thereto or other financial or statistical data contained or incorporated by reference in (or omitted from) the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus or the Exchange Act Documents and with respect to information set forth in the Pricing Prospectus and the Final Supplemented Prospectus under the captions "Description of the Series 2025B Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company" and "Description of the Series 2025B Senior Notes ─ Global Clearance and Settlement Procedures."

Subject to and on the basis of the foregoing, we further advise you that the Registration Statement, on the Effective Date, and the Final Supplemented Prospectus, as of September 16, 2025, complied as to form in all material respects with the relevant requirements of the Act and the applicable rules and regulations of the Commission thereunder and that each Exchange Act Document, as of its date of filing with the Commission, complied as to form in all material respects with the relevant requirements of the Exchange Act and the applicable rules and regulations of the Commission thereunder, except that in each case we express no belief as to the financial statements and schedules and notes thereto or other financial or statistical data contained or incorporated by reference in (or omitted from) the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus or the Exchange Act Documents.

This letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent. This letter is expressed as of the date hereof, and we do not assume any obligation to update or supplement it to reflect any fact or circumstance that hereafter comes to our attention, or any change in law that hereafter occurs.

Very truly yours,

HUNTON ANDREWS KURTH LLP

Schedule V-7

## Exhibit 4.6

Exhibit 4.6(a)

**SOUTHERN POWER COMPANY**

**TO**

**U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, TRUSTEE**

**FIRST SUPPLEMENTAL INDENTURE**

**DATED AS OF SEPTEMBER 19, 2025**

**SERIES 2025A 4.25% SENIOR NOTES**

**DUE OCTOBER 1, 2030**

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**TABLE OF CONTENTS**<sup>1</sup>

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| | | |
|:---|:---|:---|
| | <u>PAGE</u> | <u>PAGE</u> |
| ARTICLE 1 | Series 2025A Senior Notes | 1 |
| SECTION 101. | Establishment | 1 |
| SECTION 102. | Definitions | 2 |
| SECTION 103. | Payment of Principal and Interest | 3 |
| SECTION 104. | Denominations | 4 |
| SECTION 105. | Global Securities | 4 |
| SECTION 106. | Transfer | 5 |
| SECTION 107. | Redemption at the Company's Option | 5 |
| ARTICLE 2 | Miscellaneous Provisions | 6 |
| SECTION 201. | Recitals by Company | 6 |
| SECTION 202. | Ratification and Incorporation of Original Indenture | 6 |
| SECTION 203. | Executed in Counterparts | 6 |
| SECTION 204. | Force Majeure | 7 |
| EXHIBIT A | Form of Series 2025A Note | A-1 |
| EXHIBIT B | Certificate of Authentication | B-1 |

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<sup>1</sup> This **Table of Contents** does not constitute part of the Indenture or have any bearing upon the interpretation of any of its terms and provisions.

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THIS FIRST SUPPLEMENTAL INDENTURE is made as of the 19<sup>th</sup> day of September, 2025, by and between SOUTHERN POWER COMPANY, a corporation duly organized and existing under the laws of the state of Delaware having its principal place of business at 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308 (the "Company"), and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, a national banking association, 12 Concourse Parkway, Suite 800, Atlanta, Georgia 30328 (the "Trustee").

W I T N E S S E T H:

WHEREAS, the Company has heretofore entered into a Senior Note Indenture, dated as of August 1, 2025 (the "Original Indenture"), with U.S. Bank Trust Company, National Association;

WHEREAS, the Original Indenture is incorporated herein by this reference and the Original Indenture, as supplemented by this First Supplemental Indenture, is herein called the "Indenture";

WHEREAS, under the Original Indenture, a new series of unsecured senior debentures or notes or other evidence of indebtedness (the "Senior Notes") may at any time be established by the Board of Directors of the Company in accordance with the provisions of the Original Indenture and the terms of such series may be described by a supplemental indenture executed by the Company and the Trustee;

WHEREAS, the Company proposes to create under the Indenture a new series of Senior Notes;

WHEREAS, additional Senior Notes of other series hereafter established, except as may be limited in the Original Indenture as at the time supplemented and modified, may be issued from time to time pursuant to the Indenture as at the time supplemented and modified; and

WHEREAS, all conditions necessary to authorize the execution and delivery of this First Supplemental Indenture and to make it a valid and binding obligation of the Company have been done or performed.

NOW, THEREFORE, in consideration of the agreements and obligations set forth herein and for other good and valuable consideration, the sufficiency of which is hereby acknowledged, the parties hereto hereby agree as follows:

ARTICLE 1

Series 2025A Senior Notes

SECTION 101. <u>Establishment.</u> There is hereby established a new series of Senior Notes to be issued under the Indenture, to be designated as the Company's Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Series 2025A Notes").

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There are to be authenticated and delivered $550,000,000 principal amount of Series 2025A Notes, and such principal amount of the Series 2025A Notes may be increased from time to time pursuant to Section 301 of the Original Indenture. All Series 2025A Notes need not be issued at the same time and such series may be reopened at any time, without the consent of any Holder, for issuances of additional Series 2025A Notes. Any such additional Series 2025A Notes will have the same interest rate, maturity and other terms as those initially issued (except for the public offering price and issue date and the initial interest accrual date and initial Interest Payment Date (as defined below), if applicable). No Series 2025A Notes shall be authenticated and delivered in excess of the principal amount as so increased except as provided by Sections 203, 303, 304, 907 or 1107 of the Original Indenture. The Series 2025A Notes shall be issued in fully registered form.

The Series 2025A Notes shall be issued in the form of one or more Global Securities in substantially the form set out in Exhibit A hereto. The Depositary with respect to the Series 2025A Notes shall be The Depository Trust Company.

The form of the Trustee's Certificate of Authentication for the Series 2025A Notes shall be in substantially the form set forth in Exhibit B hereto.

Each Series 2025A Note shall be dated the date of authentication thereof and shall bear interest from the date of original issuance thereof or from the most recent Interest Payment Date to which interest has been paid or duly provided for.

The Series 2025A Notes will not have a sinking fund.

SECTION 102. <u>Definitions.</u> The following defined terms used herein shall, unless the context otherwise requires, have the meanings specified below. Capitalized terms used herein for which no definition is provided herein shall have the meanings set forth in the Original Indenture.

"Interest Payment Dates" means April 1 and October 1 of each year, commencing April 1, 2026.

"Original Issue Date" means September 19, 2025.

"Par Call Date" has the meaning set forth in Section 107 hereof.

"Regular Record Date" means, with respect to each Interest Payment Date, the close of business (i) on the Business Day immediately preceding such Interest Payment Date if any Series 2025A Notes are issuable in the form of one or more Global Securities or (ii) on the 15th calendar day preceding such Interest Payment Date if no Series 2025A Notes are issuable in the form of one or more Global Securities (whether or not a Business Day).

"Stated Maturity" means October 1, 2030.

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

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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 each business day 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: (1) 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 (2) 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 the 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 (3) 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 the Remaining Life. For purposes of this paragraph, 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 semiannual 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, as applicable. 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 semiannual 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.

SECTION 103. <u>Payment of Principal and Interest.</u> The principal of the Series 2025A Notes shall be due at Stated Maturity (unless earlier redeemed). The unpaid principal amount of the Series 2025A Notes shall bear interest at the rate of 4.25% per annum until paid or duly

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provided for. Interest shall be paid semiannually in arrears on each Interest Payment Date to the Person in whose name the Series 2025A Notes are registered at the close of business on the Regular Record Date for such Interest Payment Date, *provided* that interest payable at the Stated Maturity or on a Redemption Date as provided herein will be paid to the Person to whom principal is payable. Any such interest that is not so punctually paid or duly provided for will forthwith cease to be payable to the Holders on such Regular Record Date and may either be paid to the Person or Persons in whose name the Series 2025A Notes are registered at the close of business on a Special Record Date for the payment of such defaulted interest to be fixed by the Trustee, notice whereof shall be given to Holders of the Series 2025A Notes not less than ten (10) days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange, if any, on which the Series 2025A Notes shall be listed, and upon such notice as may be required by any such exchange, all as more fully provided in the Original Indenture.

Payments of interest on the Series 2025A Notes will include interest accrued to but excluding the respective Interest Payment Dates. Interest payments for the Series 2025A Notes shall be computed and paid on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on the Series 2025A Notes is not a Business Day, then payment of the interest payable on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay), with the same force and effect as if made on the date the payment was originally payable.

Payment of the principal and interest due at the Stated Maturity or earlier redemption of the Series 2025A Notes shall be made upon surrender of the Series 2025A Notes at the Corporate Trust Office of the Trustee. The principal of and interest on the Series 2025A Notes shall be paid in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. Payments of interest (including interest on any Interest Payment Date) will be made, subject to such surrender where applicable, at the option of the Company, (i) by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or (ii) by wire transfer or other electronic transfer at such place and to such account at a banking institution in the United States as may be designated in writing to the Trustee at least sixteen (16) days prior to the date for payment by the Person entitled thereto.

SECTION 104. <u>Denominations.</u> The Series 2025A Notes may be issued in denominations of $2,000 and integral multiples of $1,000 in excess thereof.

SECTION 105. <u>Global Securities.</u> The Series 2025A Notes will be issued in the form of one or more Global Securities registered in the name of the Depositary (which shall be The Depository Trust Company) or its nominee. Except under the limited circumstances described below, Series 2025A Notes represented by one or more Global Securities will not be exchangeable for, and will not otherwise be issuable as, Series 2025A Notes in definitive form. The Global Securities described above may not be transferred except by the Depositary to a nominee of the Depositary or by a nominee of the Depositary to the Depositary or another nominee of the Depositary or to a successor Depositary or its nominee.

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Owners of beneficial interests in such a Global Security will not be considered the Holders thereof for any purpose under the Indenture, and no Global Security representing a Series 2025A Note shall be exchangeable, except for another Global Security of like denomination and tenor to be registered in the name of the Depositary or its nominee or to a successor Depositary or its nominee. The rights of Holders of such Global Security shall be exercised only through the Depositary.

Subject to the procedures of the Depositary, a Global Security shall be exchangeable for Series 2025A Notes registered in the names of persons other than the Depositary or its nominee only if (i) the Depositary notifies the Company that it is unwilling or unable to continue as a Depositary for such Global Security and no successor Depositary shall have been appointed by the Company, or if at any time the Depositary ceases to be a clearing agency registered under the Securities Exchange Act of 1934, as amended, at a time when the Depositary is required to be so registered to act as such Depositary and no successor Depositary shall have been appointed by the Company, in each case within 90 days after the Company receives such notice or becomes aware of such cessation, (ii) the Company in its sole discretion determines that such Global Security shall be so exchangeable, or (iii) there shall have occurred an Event of Default with respect to the Series 2025A Notes. Any Global Security that is exchangeable pursuant to the preceding sentence shall be exchangeable for Series 2025A Notes registered in such names as the Depositary shall direct.

Neither the Company, the Trustee nor any agent of the Company or the Trustee shall have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests in a Global Security or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

SECTION 106. <u>Transfer.</u> No service charge will be made for any transfer or exchange of Series 2025A Notes, but payment will be required of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection therewith.

The Company shall not be required (a) to issue, register the transfer of or exchange any Series 2025A Notes during a period beginning at the opening of business fifteen (15) days before the day of the mailing of a notice pursuant to Section 1104 of the Original Indenture identifying the serial numbers of the Series 2025A Notes to be called for redemption, and ending at the close of business on the day of the mailing, or (b) to register the transfer of or exchange any Series 2025A Notes theretofore selected for redemption in whole or in part, except the unredeemed portion of any Series 2025A Notes redeemed in part.

SECTION 107. <u>Redemption at the Company's Option.</u> Prior to August 1, 2030 (the "Par Call Date"), the Company may redeem the Series 2025A Notes at its option, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of (1)(a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Series 2025A Notes matured on the Par Call Date) on a semiannual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points less (b)

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interest accrued to the Redemption Date, and (2) 100% of the principal amount of the Series 2025A Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to the Redemption Date.

On or after the Par Call Date, the Company may redeem the Series 2025A Notes, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at a Redemption Price equal to 100% of the principal amount of the Series 2025A Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

In the event of redemption of the Series 2025A Notes in part only, a new Series 2025A Note or Notes for the unredeemed portion will be issued in the name or names of the Holders thereof upon the surrender thereof (or through book-entry transfer for Global Securities).

Notice of redemption shall be given as provided in Section 1104 of the Original Indenture except that any such notice of redemption with respect to any redemption occurring prior to the Par Call Date shall not specify the Redemption Price therefor but only the manner of calculation thereof. 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 duty to determine, or verify the calculation of, the Redemption Price.

Any redemption of less than all of the Series 2025A Notes shall, with respect to the principal thereof, be divisible by $1,000. If less than all of the Series 2025A Notes are being redeemed, the selection of the Series 2025A Notes to be redeemed shall be done in accordance with the Depositary's procedures.

**ARTICLE 2**

**Miscellaneous Provisions**

SECTION 201. <u>Recitals by Company.</u> The recitals in this First Supplemental Indenture are made by the Company only and not by the Trustee, and all of the provisions contained in the Original Indenture in respect of the rights, privileges, immunities, powers and duties of the Trustee shall be applicable in respect of Series 2025A Notes and of this First Supplemental Indenture as fully and with like effect as if set forth herein in full.

SECTION 202. <u>Ratification and Incorporation of Original Indenture.</u> As supplemented hereby, the Original Indenture is in all respects ratified and confirmed, and the Original Indenture as supplemented by this First Supplemental Indenture shall be read, taken and construed as one and the same instrument.

SECTION 203. <u>Executed in Counterparts.</u> This First Supplemental Indenture shall be valid, binding and enforceable against a party only when executed and delivered by an authorized individual on behalf of the party by means of (i) any electronic signature permitted by the federal Electronic Signatures in Global and National Commerce Act, state enactments of the Uniform Electronic Transactions Act and/or any other relevant electronic signatures law,

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including relevant provisions of the Uniform Commercial Code (collectively, "Signature Law"); (ii) an original manual signature; or (iii) a faxed, scanned or photocopied manual signature. Each electronic signature or faxed, scanned or photocopied manual signature shall for all purposes have the same validity, legal effect and admissibility in evidence as an original manual signature. Each party hereto shall be entitled to conclusively rely upon, and shall have no liability with respect to, any faxed, scanned or photocopied manual signature, or other electronic signature, of any party and shall have no duty to investigate, confirm or otherwise verify the validity or authenticity thereof. This First Supplemental Indenture may be executed in any number of counterparts, each of which shall be deemed to be an original, but such counterparts shall, together, constitute one and the same instrument. For avoidance of doubt, original manual signatures shall be used for execution or endorsement of writings when required under the Uniform Commercial Code or other Signature Law due to the character or intended character of the writings.

SECTION 204. <u>Force Majeure.</u> In no event shall the Trustee be responsible or liable for any failure or delay in the performance of its obligations hereunder arising out of or caused by, directly or indirectly, forces beyond its control; it being understood that the Trustee shall use reasonable efforts which are consistent with accepted practices in the banking industry to resume performance as soon as practicable under the circumstances.

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IN WITNESS WHEREOF, each party hereto has caused this instrument to be signed in its name and behalf by its duly authorized officers, all as of the day and year first above written.

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| | | |
|:---|:---|:---|
| | SOUTHERN POWER COMPANY | SOUTHERN POWER COMPANY |
| By: | /s/ Gary Kerr | /s/ Gary Kerr |
|  | Name:  | Gary Kerr |
|  | Title: | Senior Vice President, Chief Financial Officer and Treasurer |
|  | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee |
| By: | /s/ Jack Ellerin | /s/ Jack Ellerin |
|  | Name: | Jack Ellerin |
|  | Title: | Vice President |

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EXHIBIT A

FORM OF SERIES 2025A NOTE <br>

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NO. __ CUSIP NO. 843646 AX8

SOUTHERN POWER COMPANY

SERIES 2025A 4.25% SENIOR NOTE

DUE OCTOBER 1, 2030

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| | |
|:---|:---|
| Principal Amount: | $________________ |
| Regular Record Date: | One Business Day prior to Interest Payment Date (if any Series 2025A Notes are issuable in the form of one or more Global Securities) or 15th calendar day prior to Interest Payment Date (if no Series 2025A Notes are issuable in the form of one or more Global Securities) |
| Original Issue Date: | September 19, 2025 |
| Stated Maturity: | October 1, 2030 |
| Interest Payment Dates: | April 1 and October 1 |
| Interest Rate: | 4.25% per annum |
| Authorized Denominations: | $2,000 and integral multiples of $1,000 in excess thereof |

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Southern Power Company, a Delaware corporation (the "Company", which term includes any successor corporation under the Indenture referred to on the reverse hereof), for value received, hereby promises to pay to ________________________________, or registered assigns, the principal sum of ______________________________________ DOLLARS ($______________) on the Stated Maturity shown above (or upon earlier redemption), and to pay interest thereon from the Original Issue Date shown above, or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semiannually in arrears on each Interest Payment Date as specified above, commencing on April 1, 2026, and on the Stated Maturity (or upon earlier redemption) at the rate per annum shown above until the principal hereof is paid or made available for payment and at such rate on any overdue principal and on any overdue installment of interest. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date (other than an Interest Payment Date that is the Stated Maturity or on a Redemption Date) will, as provided in such Indenture, be paid to the Person in whose name this Note (the "Note") is registered at the close of business on the Regular Record Date as specified above next preceding such Interest Payment Date, provided that any interest payable at the Stated Maturity or on any Redemption Date will be paid to the Person to whom principal is payable. Except as otherwise provided in the Indenture, any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Note is registered at the close of business on a Special Record Date for the payment of such defaulted interest to be fixed by the Trustee, notice whereof shall be given to Holders of Notes of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not

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inconsistent with the requirements of any securities exchange, if any, on which the Notes of this series shall be listed, and upon such notice as may be required by any such exchange, all as more fully provided in the Indenture.

Payments of interest on this Note will include interest accrued to but excluding the respective Interest Payment Dates. Interest payments for this Note shall be computed and paid on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on this Note is not a Business Day, then payment of the interest payable on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay), with the same force and effect as if made on the date the payment was originally payable. A "Business Day" shall mean any day other than a Saturday or a Sunday or a day on which banking institutions in New York City are authorized or required by law or executive order to remain closed or a day on which the Corporate Trust Office of the Trustee is closed for business.

Payment of the principal of and interest due at the Stated Maturity or earlier redemption of the Series 2025A Notes shall be made upon surrender of the Series 2025A Notes at the Corporate Trust Office of the Trustee. The principal of and interest on the Series 2025A Notes shall be paid in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. Payment of interest (including interest on an Interest Payment Date) will be made, subject to such surrender where applicable, at the option of the Company, (i) by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or (ii) by wire transfer or other electronic transfer at such place and to such account at a banking institution in the United States as may be designated in writing to the Trustee at least 16 days prior to the date for payment by the Person entitled thereto.

REFERENCE IS HEREBY MADE TO THE FURTHER PROVISIONS OF THIS NOTE SET FORTH ON THE REVERSE HEREOF, WHICH FURTHER PROVISIONS SHALL FOR ALL PURPOSES HAVE THE SAME EFFECT AS IF SET FORTH AT THIS PLACE.

Unless the certificate of authentication hereon has been executed by the Trustee by manual signature, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

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IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

Dated:

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| | |
|:---|:---|
| | SOUTHERN POWER COMPANY |
| | By: |
| | Title: |
| Attest: |  |
| Title: |  |

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{Seal of SOUTHERN POWER COMPANY appears here}

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CERTIFICATE OF AUTHENTICATION

This is one of the Senior Notes referred to in the within-mentioned Indenture.

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| | | |
|:---|:---|:---|
| Dated: | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,<br>as Trustee | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,<br>as Trustee |
|  | By: |  |
|  |  | Authorized Signatory |

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(Reverse Side of Note)

This Note is one of a duly authorized issue of Senior Notes of the Company (the "Notes"), issued and issuable in one or more series under a Senior Note Indenture, dated as of August 1, 2025, as supplemented (the "Indenture"), between the Company and U.S. Bank Trust Company, National Association, as Trustee (the "Trustee," which term includes any successor trustee under the Indenture), to which Indenture and all indentures incidental thereto reference is hereby made for a statement of the respective rights, limitation of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Notes issued thereunder and of the terms upon which said Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof as Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Series 2025A Notes") which is unlimited in aggregate principal amount. Capitalized terms used herein for which no definition is provided herein shall have the meanings set forth in the Indenture.

Prior to August 1, 2030 (the "Par Call Date"), the Company may redeem the Series 2025A Notes at its option, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of (1)(a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Series 2025A Notes matured on the Par Call Date) on a semiannual 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 (2) 100% of the principal amount of the Series 2025A Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to the Redemption Date.

On or after the Par Call Date, the Company may redeem the Series 2025A Notes, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at a Redemption Price equal to 100% of the principal amount of the Series 2025A Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

"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 each business day 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: (1) 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 (2) if there is no such Treasury constant maturity on

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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 the 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 (3) 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 the Remaining Life. For purposes of this paragraph, 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 semiannual 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, as applicable. 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 semiannual 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 duty to determine, or verify the calculation of, the Redemption Price.

In the event of redemption of this Note in part only, a new Note or Notes of this series for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the surrender hereof.

The Series 2025A Notes will not have a sinking fund.

If an Event of Default with respect to the Notes of this series shall occur and be continuing, the principal of the Notes of this series may be declared due and payable in the manner, with the effect and subject to the conditions provided in the Indenture.

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The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Notes of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Notes at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Notes of each series at the time Outstanding, on behalf of the Holders of all Notes of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Note issued upon the registration of transfer hereof or in exchange hereof or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and interest on this Note at the times, place and rate, and in the coin or currency, herein prescribed.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Note is registrable in the Security Register, upon surrender of this Note for registration of transfer at the office or agency of the Company for such purpose, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar and duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of this series, of authorized denominations and of like tenor and for the same aggregate principal amount, will be issued to the designated transferee or transferees. No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Note for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

The Notes of this series are issuable only in registered form without coupons in denominations of $2,000 and integral multiples of $1,000 in excess thereof. As provided in the Indenture and subject to certain limitations therein set forth, Notes of this series are exchangeable for a like aggregate principal amount of Notes of this series of a different authorized denomination, as requested by the Holder surrendering the same upon surrender of the Note or Notes to be exchanged at the office or agency of the Company.

This Note shall be governed by, and construed in accordance with, the internal laws of the State of New York.

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**ABBREVIATIONS**

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

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| | | |
|:---|:---|:---|
| TEN COM - | as tenants in<br>common | UNIF GIFT MIN ACT- _______ Custodian ________<br>&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;(Cust)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (Minor) |
| TEN ENT - | as tenants by the<br>entireties | |
| JT TEN - | as joint tenants<br>with right of<br>survivorship and<br>not as tenants<br>in common | &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;under Uniform Gifts to<br>Minors Act<br>________________________<br>&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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(State) |

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Additional abbreviations may also be used

though not on the above list.

FOR VALUE RECEIVED, the undersigned hereby sell(s) and transfer(s) unto

<u>_________________________________________________________________________</u>

(please insert Social Security or other identifying number of assignee)

<u>__________________________________________________________________________</u>

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE OF ASSIGNEE

<u>__________________________________________________________________________</u>

<u>__________________________________________________________________________</u>

the within Note and all rights thereunder, hereby irrevocably constituting and appointing

<u>__________________________________________________________________________</u>

<u>__________________________________________________________________________</u>

agent to transfer said Note on the books of the Company, with full power of substitution in the premises.

Dated:<br>

NOTICE: The signature to this assignment must correspond with the name as written upon the face of the within instrument in every particular without alteration or enlargement, or any change whatever.

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EXHIBIT B <br>CERTIFICATE OF AUTHENTICATION

This is one of the Senior Notes referred to in the within-mentioned Indenture.

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| | | |
|:---|:---|:---|
| Dated: | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,<br>as Trustee | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,<br>as Trustee |
|  | By: |  |
|  |  | Authorized Signatory |

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## Exhibit 4.6

Exhibit 4.6(b)

**SOUTHERN POWER COMPANY**

**TO**

**U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, TRUSTEE**

**SECOND SUPPLEMENTAL INDENTURE**

**DATED AS OF SEPTEMBER 19, 2025**

**SERIES 2025B 4.90% SENIOR NOTES**

**DUE OCTOBER 1, 2035**

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**TABLE OF CONTENTS**<sup>1</sup>

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| | | |
|:---|:---|:---|
| | <u>PAGE</u> | <u>PAGE</u> |
| ARTICLE 1 | Series 2025B Senior Notes | 1 |
| SECTION 101. | Establishment | 1 |
| SECTION 102. | Definitions | 2 |
| SECTION 103. | Payment of Principal and Interest | 3 |
| SECTION 104. | Denominations | 4 |
| SECTION 105. | Global Securities | 4 |
| SECTION 106. | Transfer | 5 |
| SECTION 107. | Redemption at the Company's Option | 5 |
| ARTICLE 2 | Miscellaneous Provisions | 6 |
| SECTION 201. | Recitals by Company | 6 |
| SECTION 202. | Ratification and Incorporation of Original Indenture | 6 |
| SECTION 203. | Executed in Counterparts | 6 |
| SECTION 204. | Force Majeure | 7 |
| EXHIBIT A | Form of Series 2025B Note | A-1 |
| EXHIBIT B | Certificate of Authentication | B-1 |

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______________________

<sup>1</sup> This **Table of Contents** does not constitute part of the Indenture or have any bearing upon the interpretation of any of its terms and provisions.

i

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THIS SECOND SUPPLEMENTAL INDENTURE is made as of the 19<sup>th</sup> day of September, 2025, by and between SOUTHERN POWER COMPANY, a corporation duly organized and existing under the laws of the state of Delaware having its principal place of business at 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308 (the "Company"), and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, a national banking association, 12 Concourse Parkway, Suite 800, Atlanta, Georgia 30328 (the "Trustee").

W I T N E S S E T H:

WHEREAS, the Company has heretofore entered into a Senior Note Indenture, dated as of August 1, 2025 (the "Original Indenture"), with U.S. Bank Trust Company, National Association, as heretofore supplemented;

WHEREAS, the Original Indenture is incorporated herein by this reference and the Original Indenture, as heretofore supplemented and as further supplemented by this Second Supplemental Indenture, is herein called the "Indenture";

WHEREAS, under the Original Indenture, a new series of unsecured senior debentures or notes or other evidence of indebtedness (the "Senior Notes") may at any time be established by the Board of Directors of the Company in accordance with the provisions of the Original Indenture and the terms of such series may be described by a supplemental indenture executed by the Company and the Trustee;

WHEREAS, the Company proposes to create under the Indenture a new series of Senior Notes;

WHEREAS, additional Senior Notes of other series hereafter established, except as may be limited in the Original Indenture as at the time supplemented and modified, may be issued from time to time pursuant to the Indenture as at the time supplemented and modified; and

WHEREAS, all conditions necessary to authorize the execution and delivery of this Second Supplemental Indenture and to make it a valid and binding obligation of the Company have been done or performed.

NOW, THEREFORE, in consideration of the agreements and obligations set forth herein and for other good and valuable consideration, the sufficiency of which is hereby acknowledged, the parties hereto hereby agree as follows:

ARTICLE 1

Series 2025B Senior Notes

SECTION 101. <u>Establishment.</u> There is hereby established a new series of Senior Notes to be issued under the Indenture, to be designated as the Company's Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Series 2025B Notes").

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There are to be authenticated and delivered $550,000,000 principal amount of Series 2025B Notes, and such principal amount of the Series 2025B Notes may be increased from time to time pursuant to Section 301 of the Original Indenture. All Series 2025B Notes need not be issued at the same time and such series may be reopened at any time, without the consent of any Holder, for issuances of additional Series 2025B Notes. Any such additional Series 2025B Notes will have the same interest rate, maturity and other terms as those initially issued (except for the public offering price and issue date and the initial interest accrual date and initial Interest Payment Date (as defined below), if applicable). No Series 2025B Notes shall be authenticated and delivered in excess of the principal amount as so increased except as provided by Sections 203, 303, 304, 907 or 1107 of the Original Indenture. The Series 2025B Notes shall be issued in fully registered form.

The Series 2025B Notes shall be issued in the form of one or more Global Securities in substantially the form set out in Exhibit A hereto. The Depositary with respect to the Series 2025B Notes shall be The Depository Trust Company.

The form of the Trustee's Certificate of Authentication for the Series 2025B Notes shall be in substantially the form set forth in Exhibit B hereto.

Each Series 2025B Note shall be dated the date of authentication thereof and shall bear interest from the date of original issuance thereof or from the most recent Interest Payment Date to which interest has been paid or duly provided for.

The Series 2025B Notes will not have a sinking fund.

SECTION 102. <u>Definitions.</u> The following defined terms used herein shall, unless the context otherwise requires, have the meanings specified below. Capitalized terms used herein for which no definition is provided herein shall have the meanings set forth in the Original Indenture.

"Interest Payment Dates" means April 1 and October 1 of each year, commencing April 1, 2026.

"Original Issue Date" means September 19, 2025.

"Par Call Date" has the meaning set forth in Section 107 hereof.

"Regular Record Date" means, with respect to each Interest Payment Date, the close of business (i) on the Business Day immediately preceding such Interest Payment Date if any Series 2025B Notes are issuable in the form of one or more Global Securities or (ii) on the 15th calendar day preceding such Interest Payment Date if no Series 2025B Notes are issuable in the form of one or more Global Securities (whether or not a Business Day).

"Stated Maturity" means October 1, 2035.

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

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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 each business day 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: (1) 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 (2) 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 the 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 (3) 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 the Remaining Life. For purposes of this paragraph, 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 semiannual 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, as applicable. 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 semiannual 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.

SECTION 103. <u>Payment of Principal and Interest.</u> The principal of the Series 2025B Notes shall be due at Stated Maturity (unless earlier redeemed). The unpaid principal amount of the Series 2025B Notes shall bear interest at the rate of 4.90% per annum until paid or duly

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provided for. Interest shall be paid semiannually in arrears on each Interest Payment Date to the Person in whose name the Series 2025B Notes are registered at the close of business on the Regular Record Date for such Interest Payment Date, *provided* that interest payable at the Stated Maturity or on a Redemption Date as provided herein will be paid to the Person to whom principal is payable. Any such interest that is not so punctually paid or duly provided for will forthwith cease to be payable to the Holders on such Regular Record Date and may either be paid to the Person or Persons in whose name the Series 2025B Notes are registered at the close of business on a Special Record Date for the payment of such defaulted interest to be fixed by the Trustee, notice whereof shall be given to Holders of the Series 2025B Notes not less than ten (10) days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange, if any, on which the Series 2025B Notes shall be listed, and upon such notice as may be required by any such exchange, all as more fully provided in the Original Indenture.

Payments of interest on the Series 2025B Notes will include interest accrued to but excluding the respective Interest Payment Dates. Interest payments for the Series 2025B Notes shall be computed and paid on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on the Series 2025B Notes is not a Business Day, then payment of the interest payable on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay), with the same force and effect as if made on the date the payment was originally payable.

Payment of the principal and interest due at the Stated Maturity or earlier redemption of the Series 2025B Notes shall be made upon surrender of the Series 2025B Notes at the Corporate Trust Office of the Trustee. The principal of and interest on the Series 2025B Notes shall be paid in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. Payments of interest (including interest on any Interest Payment Date) will be made, subject to such surrender where applicable, at the option of the Company, (i) by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or (ii) by wire transfer or other electronic transfer at such place and to such account at a banking institution in the United States as may be designated in writing to the Trustee at least sixteen (16) days prior to the date for payment by the Person entitled thereto.

SECTION 104. <u>Denominations.</u> The Series 2025B Notes may be issued in denominations of $2,000 and integral multiples of $1,000 in excess thereof.

SECTION 105. <u>Global Securities.</u> The Series 2025B Notes will be issued in the form of one or more Global Securities registered in the name of the Depositary (which shall be The Depository Trust Company) or its nominee. Except under the limited circumstances described below, Series 2025B Notes represented by one or more Global Securities will not be exchangeable for, and will not otherwise be issuable as, Series 2025B Notes in definitive form. The Global Securities described above may not be transferred except by the Depositary to a nominee of the Depositary or by a nominee of the Depositary to the Depositary or another nominee of the Depositary or to a successor Depositary or its nominee.

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Owners of beneficial interests in such a Global Security will not be considered the Holders thereof for any purpose under the Indenture, and no Global Security representing a Series 2025B Note shall be exchangeable, except for another Global Security of like denomination and tenor to be registered in the name of the Depositary or its nominee or to a successor Depositary or its nominee. The rights of Holders of such Global Security shall be exercised only through the Depositary.

Subject to the procedures of the Depositary, a Global Security shall be exchangeable for Series 2025B Notes registered in the names of persons other than the Depositary or its nominee only if (i) the Depositary notifies the Company that it is unwilling or unable to continue as a Depositary for such Global Security and no successor Depositary shall have been appointed by the Company, or if at any time the Depositary ceases to be a clearing agency registered under the Securities Exchange Act of 1934, as amended, at a time when the Depositary is required to be so registered to act as such Depositary and no successor Depositary shall have been appointed by the Company, in each case within 90 days after the Company receives such notice or becomes aware of such cessation, (ii) the Company in its sole discretion determines that such Global Security shall be so exchangeable, or (iii) there shall have occurred an Event of Default with respect to the Series 2025B Notes. Any Global Security that is exchangeable pursuant to the preceding sentence shall be exchangeable for Series 2025B Notes registered in such names as the Depositary shall direct.

Neither the Company, the Trustee nor any agent of the Company or the Trustee shall have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests in a Global Security or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

SECTION 106. <u>Transfer.</u> No service charge will be made for any transfer or exchange of Series 2025B Notes, but payment will be required of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection therewith.

The Company shall not be required (a) to issue, register the transfer of or exchange any Series 2025B Notes during a period beginning at the opening of business fifteen (15) days before the day of the mailing of a notice pursuant to Section 1104 of the Original Indenture identifying the serial numbers of the Series 2025B Notes to be called for redemption, and ending at the close of business on the day of the mailing, or (b) to register the transfer of or exchange any Series 2025B Notes theretofore selected for redemption in whole or in part, except the unredeemed portion of any Series 2025B Notes redeemed in part.

SECTION 107. <u>Redemption at the Company's Option.</u> Prior to April 1, 2035 (the "Par Call Date"), the Company may redeem the Series 2025B Notes at its option, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of (1)(a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Series 2025B Notes matured on the Par Call Date) on a semiannual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points less (b)

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interest accrued to the Redemption Date, and (2) 100% of the principal amount of the Series 2025B Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to the Redemption Date.

On or after the Par Call Date, the Company may redeem the Series 2025B Notes, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at a Redemption Price equal to 100% of the principal amount of the Series 2025B Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

In the event of redemption of the Series 2025B Notes in part only, a new Series 2025B Note or Notes for the unredeemed portion will be issued in the name or names of the Holders thereof upon the surrender thereof (or through book-entry transfer for Global Securities).

Notice of redemption shall be given as provided in Section 1104 of the Original Indenture except that any such notice of redemption with respect to any redemption occurring prior to the Par Call Date shall not specify the Redemption Price therefor but only the manner of calculation thereof. 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 duty to determine, or verify the calculation of, the Redemption Price.

Any redemption of less than all of the Series 2025B Notes shall, with respect to the principal thereof, be divisible by $1,000. If less than all of the Series 2025B Notes are being redeemed, the selection of the Series 2025B Notes to be redeemed shall be done in accordance with the Depositary's procedures.

**ARTICLE 2**

**Miscellaneous Provisions**

SECTION 201. <u>Recitals by Company.</u> The recitals in this Second Supplemental Indenture are made by the Company only and not by the Trustee, and all of the provisions contained in the Original Indenture in respect of the rights, privileges, immunities, powers and duties of the Trustee shall be applicable in respect of Series 2025B Notes and of this Second Supplemental Indenture as fully and with like effect as if set forth herein in full.

SECTION 202. <u>Ratification and Incorporation of Original Indenture.</u> As supplemented hereby, the Original Indenture is in all respects ratified and confirmed, and the Original Indenture as supplemented by this Second Supplemental Indenture shall be read, taken and construed as one and the same instrument.

SECTION 203. <u>Executed in Counterparts.</u> This Second Supplemental Indenture shall be valid, binding and enforceable against a party only when executed and delivered by an authorized individual on behalf of the party by means of (i) any electronic signature permitted by the federal Electronic Signatures in Global and National Commerce Act, state enactments of the Uniform Electronic Transactions Act and/or any other relevant electronic signatures law,

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including relevant provisions of the Uniform Commercial Code (collectively, "Signature Law"); (ii) an original manual signature; or (iii) a faxed, scanned or photocopied manual signature. Each electronic signature or faxed, scanned or photocopied manual signature shall for all purposes have the same validity, legal effect and admissibility in evidence as an original manual signature. Each party hereto shall be entitled to conclusively rely upon, and shall have no liability with respect to, any faxed, scanned or photocopied manual signature, or other electronic signature, of any party and shall have no duty to investigate, confirm or otherwise verify the validity or authenticity thereof. This Second Supplemental Indenture may be executed in any number of counterparts, each of which shall be deemed to be an original, but such counterparts shall, together, constitute one and the same instrument. For avoidance of doubt, original manual signatures shall be used for execution or endorsement of writings when required under the Uniform Commercial Code or other Signature Law due to the character or intended character of the writings.

SECTION 204. <u>Force Majeure.</u> In no event shall the Trustee be responsible or liable for any failure or delay in the performance of its obligations hereunder arising out of or caused by, directly or indirectly, forces beyond its control; it being understood that the Trustee shall use reasonable efforts which are consistent with accepted practices in the banking industry to resume performance as soon as practicable under the circumstances.

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IN WITNESS WHEREOF, each party hereto has caused this instrument to be signed in its name and behalf by its duly authorized officers, all as of the day and year first above written.

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| | | |
|:---|:---|:---|
| | SOUTHERN POWER COMPANY | SOUTHERN POWER COMPANY |
| By: | /s/ Gary Kerr | /s/ Gary Kerr |
|  | Name:  | Gary Kerr |
|  | Title: | Senior Vice President, Chief Financial Officer and Treasurer |
|  | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee |
| By: | /s/ Jack Ellerin | /s/ Jack Ellerin |
|  | Name: | Jack Ellerin |
|  | Title: | Vice President |

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EXHIBIT A

FORM OF SERIES 2025B NOTE <br>

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NO. __ CUSIP NO. 843646 AY6

SOUTHERN POWER COMPANY

SERIES 2025B 4.90% SENIOR NOTE

DUE OCTOBER 1, 2035

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| | |
|:---|:---|
| Principal Amount: | $________________ |
| Regular Record Date: | One Business Day prior to Interest Payment Date (if any Series 2025B Notes are issuable in the form of one or more Global Securities) or 15th calendar day prior to Interest Payment Date (if no Series 2025B Notes are issuable in the form of one or more Global Securities) |
| Original Issue Date: | September 19, 2025 |
| Stated Maturity: | October 1, 2035 |
| Interest Payment Dates: | April 1 and October 1 |
| Interest Rate: | 4.90% per annum |
| Authorized Denominations: | $2,000 and integral multiples of $1,000 in excess thereof |

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Southern Power Company, a Delaware corporation (the "Company", which term includes any successor corporation under the Indenture referred to on the reverse hereof), for value received, hereby promises to pay to ________________________________, or registered assigns, the principal sum of ______________________________________ DOLLARS ($______________) on the Stated Maturity shown above (or upon earlier redemption), and to pay interest thereon from the Original Issue Date shown above, or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semiannually in arrears on each Interest Payment Date as specified above, commencing on April 1, 2026, and on the Stated Maturity (or upon earlier redemption) at the rate per annum shown above until the principal hereof is paid or made available for payment and at such rate on any overdue principal and on any overdue installment of interest. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date (other than an Interest Payment Date that is the Stated Maturity or on a Redemption Date) will, as provided in such Indenture, be paid to the Person in whose name this Note (the "Note") is registered at the close of business on the Regular Record Date as specified above next preceding such Interest Payment Date, provided that any interest payable at the Stated Maturity or on any Redemption Date will be paid to the Person to whom principal is payable. Except as otherwise provided in the Indenture, any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Note is registered at the close of business on a Special Record Date for the payment of such defaulted interest to be fixed by the Trustee, notice whereof shall be given to Holders of Notes of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not

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inconsistent with the requirements of any securities exchange, if any, on which the Notes of this series shall be listed, and upon such notice as may be required by any such exchange, all as more fully provided in the Indenture.

Payments of interest on this Note will include interest accrued to but excluding the respective Interest Payment Dates. Interest payments for this Note shall be computed and paid on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on this Note is not a Business Day, then payment of the interest payable on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay), with the same force and effect as if made on the date the payment was originally payable. A "Business Day" shall mean any day other than a Saturday or a Sunday or a day on which banking institutions in New York City are authorized or required by law or executive order to remain closed or a day on which the Corporate Trust Office of the Trustee is closed for business.

Payment of the principal of and interest due at the Stated Maturity or earlier redemption of the Series 2025B Notes shall be made upon surrender of the Series 2025B Notes at the Corporate Trust Office of the Trustee. The principal of and interest on the Series 2025B Notes shall be paid in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. Payment of interest (including interest on an Interest Payment Date) will be made, subject to such surrender where applicable, at the option of the Company, (i) by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or (ii) by wire transfer or other electronic transfer at such place and to such account at a banking institution in the United States as may be designated in writing to the Trustee at least 16 days prior to the date for payment by the Person entitled thereto.

REFERENCE IS HEREBY MADE TO THE FURTHER PROVISIONS OF THIS NOTE SET FORTH ON THE REVERSE HEREOF, WHICH FURTHER PROVISIONS SHALL FOR ALL PURPOSES HAVE THE SAME EFFECT AS IF SET FORTH AT THIS PLACE.

Unless the certificate of authentication hereon has been executed by the Trustee by manual signature, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

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IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

Dated:

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| | |
|:---|:---|
| | SOUTHERN POWER COMPANY |
| | By: |
| | Title: |
| Attest: |  |
| Title: |  |

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{Seal of SOUTHERN POWER COMPANY appears here}

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CERTIFICATE OF AUTHENTICATION

This is one of the Senior Notes referred to in the within-mentioned Indenture.

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| | | |
|:---|:---|:---|
| Dated: | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,<br>as Trustee | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,<br>as Trustee |
|  | By: |  |
|  |  | Authorized Signatory |

---

------

(Reverse Side of Note)

This Note is one of a duly authorized issue of Senior Notes of the Company (the "Notes"), issued and issuable in one or more series under a Senior Note Indenture, dated as of August 1, 2025, as supplemented (the "Indenture"), between the Company and U.S. Bank Trust Company, National Association, as Trustee (the "Trustee," which term includes any successor trustee under the Indenture), to which Indenture and all indentures incidental thereto reference is hereby made for a statement of the respective rights, limitation of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Notes issued thereunder and of the terms upon which said Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof as Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Series 2025B Notes") which is unlimited in aggregate principal amount. Capitalized terms used herein for which no definition is provided herein shall have the meanings set forth in the Indenture.

Prior to April 1, 2035 (the "Par Call Date"), the Company may redeem the Series 2025B Notes at its option, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of (1)(a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Series 2025B Notes matured on the Par Call Date) on a semiannual 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 (2) 100% of the principal amount of the Series 2025B Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to the Redemption Date.

On or after the Par Call Date, the Company may redeem the Series 2025B Notes, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at a Redemption Price equal to 100% of the principal amount of the Series 2025B Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

"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 each business day 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: (1) 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 (2) 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 the 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 (3) 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 the Remaining Life. For purposes of this paragraph, 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 semiannual 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, as applicable. 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 semiannual 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 duty to determine, or verify the calculation of, the Redemption Price.

In the event of redemption of this Note in part only, a new Note or Notes of this series for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the surrender hereof.

The Series 2025B Notes will not have a sinking fund.

If an Event of Default with respect to the Notes of this series shall occur and be continuing, the principal of the Notes of this series may be declared due and payable in the manner, with the effect and subject to the conditions provided in the Indenture.

------

The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Notes of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Notes at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Notes of each series at the time Outstanding, on behalf of the Holders of all Notes of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Note issued upon the registration of transfer hereof or in exchange hereof or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and interest on this Note at the times, place and rate, and in the coin or currency, herein prescribed.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Note is registrable in the Security Register, upon surrender of this Note for registration of transfer at the office or agency of the Company for such purpose, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar and duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of this series, of authorized denominations and of like tenor and for the same aggregate principal amount, will be issued to the designated transferee or transferees. No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Note for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

The Notes of this series are issuable only in registered form without coupons in denominations of $2,000 and integral multiples of $1,000 in excess thereof. As provided in the Indenture and subject to certain limitations therein set forth, Notes of this series are exchangeable for a like aggregate principal amount of Notes of this series of a different authorized denomination, as requested by the Holder surrendering the same upon surrender of the Note or Notes to be exchanged at the office or agency of the Company.

This Note shall be governed by, and construed in accordance with, the internal laws of the State of New York.

------

**ABBREVIATIONS**

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

---

| | | |
|:---|:---|:---|
| TEN COM - | as tenants in<br>common | UNIF GIFT MIN ACT- _______ Custodian ________<br>&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;(Cust)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (Minor) |
| TEN ENT - | as tenants by the<br>entireties | |
| JT TEN - | as joint tenants<br>with right of<br>survivorship and<br>not as tenants<br>in common | &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;under Uniform Gifts to<br>Minors Act<br>________________________<br>&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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(State) |

---

Additional abbreviations may also be used

though not on the above list.

FOR VALUE RECEIVED, the undersigned hereby sell(s) and transfer(s) unto

<u>_________________________________________________________________________</u>

(please insert Social Security or other identifying number of assignee)

<u>__________________________________________________________________________</u>

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE OF ASSIGNEE

<u>__________________________________________________________________________</u>

<u>__________________________________________________________________________</u>

the within Note and all rights thereunder, hereby irrevocably constituting and appointing

<u>__________________________________________________________________________</u>

<u>__________________________________________________________________________</u>

agent to transfer said Note on the books of the Company, with full power of substitution in the premises.

Dated:<br>

NOTICE: The signature to this assignment must correspond with the name as written upon the face of the within instrument in every particular without alteration or enlargement, or any change whatever.

------

EXHIBIT B <br>CERTIFICATE OF AUTHENTICATION

This is one of the Senior Notes referred to in the within-mentioned Indenture.

---

| | | |
|:---|:---|:---|
| Dated: | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,<br>as Trustee | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,<br>as Trustee |
|  | By: |  |
|  |  | Authorized Signatory |

---

## Exhibit 5.1

Exhibit 5.1(a)

[Letterhead of Troutman Pepper Locke LLP]

September 19, 2025

Southern Power Company

30 Ivan Allen Jr. Blvd., N.W.

Atlanta, Georgia 30308

Re: Registration Statement on Form S-3

Ladies and Gentlemen:

We have acted as counsel to Southern Power Company (the "Company") in connection with the Registration Statement on Form S-3 (Registration Statement No. 333-289172) filed with the Securities and Exchange Commission (the "Commission") (the "Registration Statement") under the Securities Act of 1933, as amended (the "Act"), relating to $550,000,000 aggregate principal amount of the Company's Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Notes"). The Notes will be issued pursuant to the Senior Note Indenture dated as of August 1, 2025 between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as supplemented by a First Supplemental Indenture dated as of September 19, 2025 (collectively, the "Indenture").

We have examined the Registration Statement and the Indenture, which has been filed with the Commission as an exhibit to the Registration Statement. We have also examined the originals, or duplicates or certified or conformed copies, of such records, agreements, instruments and other documents and have made such other and further investigations as we have deemed relevant and necessary in connection with the opinions expressed herein. As to questions of fact material to this opinion, we have relied upon certificates of public officials and of officers and representatives of the Company.

In rendering the opinions set forth below, we have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as duplicates or certified or conformed copies and the authenticity of the originals of such latter documents. We have also assumed that the Indenture is the valid and legally binding obligation of the Trustee.

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion that the Notes are valid, binding and legal obligations of the Company, except as may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and to general principles of equity, whether considered in a proceeding at law or in equity. In rendering the foregoing opinion, with

------

**September 19, 2025**

respect to matters of New York law, we have relied on the opinion of Hunton Andrews Kurth LLP attached hereto as Annex I.

We do not express any opinion herein concerning any law other than the General Corporation Law of the State of Delaware, the federal law of the United States and, to the extent set forth herein, the law of the State of New York.

We hereby consent to the filing of this opinion with the Commission as an exhibit to the Registration Statement and to the statements with respect to our name under the heading "Legal Matters" in the prospectus forming part of the Registration Statement. In giving the foregoing consent, we do not hereby admit that we come within the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder. This opinion may not be relied upon, furnished or quoted by you for any other purpose, without our prior written consent.

Very truly yours,

/s/ Troutman Pepper Locke LLP

------

Annex I

[Letterhead of Hunton Andrews Kurth LLP]

September 19, 2025

Troutman Pepper Locke LLP

Bank of America Plaza

600 Peachtree Street, N.E.

Suite 3000

Atlanta, Georgia 30308

RE:&nbsp;&nbsp;&nbsp;&nbsp; Registration Statement on Form S-3

To the Addressee:

We have acted as counsel to the underwriters in connection with the Registration Statement on Form S-3 (Registration Statement No. 333-289172) (the "Registration Statement") relating to $550,000,000 aggregate principal amount of Southern Power Company's (the "Company") Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Notes"). The Notes will be issued pursuant to the Senior Note Indenture dated as of August 1, 2025 between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as supplemented by a First Supplemental Indenture dated as of September 19, 2025 (collectively, the "Indenture").

We have examined the Registration Statement and the Indenture, which has been filed with the Securities and Exchange Commission (the "Commission") as an exhibit to the Registration Statement. We have also examined the originals, or duplicates or certified or conformed copies, of such records, agreements, instruments and other documents and have made such other and further investigations as we have deemed relevant and necessary in connection with the opinions expressed herein. As to questions of fact material to the opinion set forth below, we have relied upon certificates of public officials and of officers and representatives of the Company.

In rendering the opinion set forth below, we have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as duplicates or certified or conformed copies and the authenticity of the originals of such latter documents. We have also assumed that the Indenture is the valid and legally binding obligation of the Trustee.

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion that the Notes are valid, binding and legal obligations of the Company, except as may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity, whether considered in a proceeding at law or in equity.

------

Troutman Pepper Locke LLP

September 19, 2025

We do not express any opinion concerning any law other than the law of the State of New York.

This opinion letter is furnished for your benefit in connection with your rendering an opinion to the Company to be filed as Exhibit 5.1 to the Registration Statement and we hereby consent to your attaching this opinion letter as an annex to such opinion. This opinion letter may not be relied upon by you for any other purpose, or quoted to or relied upon by any other person, firm or entity for any purpose, without our prior written consent. In giving our consent to your attaching this opinion letter to the opinion being rendered by you, we do not hereby admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Commission thereunder.

Very truly yours,

/s/ Hunton Andrews Kurth LLP

## Exhibit 5.1

Exhibit 5.1(b)

[Letterhead of Troutman Pepper Locke LLP]

September 19, 2025

Southern Power Company

30 Ivan Allen Jr. Blvd., N.W.

Atlanta, Georgia 30308

Re: Registration Statement on Form S-3

Ladies and Gentlemen:

We have acted as counsel to Southern Power Company (the "Company") in connection with the Registration Statement on Form S-3 (Registration Statement No. 333-289172) filed with the Securities and Exchange Commission (the "Commission") (the "Registration Statement") under the Securities Act of 1933, as amended (the "Act"), relating to $550,000,000 aggregate principal amount of the Company's Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Notes"). The Notes will be issued pursuant to the Senior Note Indenture dated as of August 1, 2025 between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as supplemented by a Second Supplemental Indenture dated as of September 19, 2025 (collectively, the "Indenture").

We have examined the Registration Statement and the Indenture, which has been filed with the Commission as an exhibit to the Registration Statement. We have also examined the originals, or duplicates or certified or conformed copies, of such records, agreements, instruments and other documents and have made such other and further investigations as we have deemed relevant and necessary in connection with the opinions expressed herein. As to questions of fact material to this opinion, we have relied upon certificates of public officials and of officers and representatives of the Company.

In rendering the opinions set forth below, we have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as duplicates or certified or conformed copies and the authenticity of the originals of such latter documents. We have also assumed that the Indenture is the valid and legally binding obligation of the Trustee.

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion that the Notes are valid, binding and legal obligations of the Company, except as may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally and to general principles of equity, whether considered in a proceeding at law or in equity. In rendering the foregoing opinion, with

------

**September 19, 2025**

respect to matters of New York law, we have relied on the opinion of Hunton Andrews Kurth LLP attached hereto as Annex I.

We do not express any opinion herein concerning any law other than the General Corporation Law of the State of Delaware, the federal law of the United States and, to the extent set forth herein, the law of the State of New York.

We hereby consent to the filing of this opinion with the Commission as an exhibit to the Registration Statement and to the statements with respect to our name under the heading "Legal Matters" in the prospectus forming part of the Registration Statement. In giving the foregoing consent, we do not hereby admit that we come within the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder. This opinion may not be relied upon, furnished or quoted by you for any other purpose, without our prior written consent.

Very truly yours,

/s/ Troutman Pepper Locke LLP

------

Annex I

[Letterhead of Hunton Andrews Kurth LLP]

September 19, 2025

Troutman Pepper Locke LLP

Bank of America Plaza

600 Peachtree Street, N.E.

Suite 3000

Atlanta, Georgia 30308

RE:&nbsp;&nbsp;&nbsp;&nbsp; Registration Statement on Form S-3

To the Addressee:

We have acted as counsel to the underwriters in connection with the Registration Statement on Form S-3 (Registration Statement No. 333-289172) (the "Registration Statement") relating to $550,000,000 aggregate principal amount of Southern Power Company's (the "Company") Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Notes"). The Notes will be issued pursuant to the Senior Note Indenture dated as of August 1, 2025 between the Company and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"), as heretofore supplemented and as further supplemented by a Second Supplemental Indenture dated as of September 19, 2025 (collectively, the "Indenture").

We have examined the Registration Statement and the Indenture, which has been filed with the Securities and Exchange Commission (the "Commission") as an exhibit to the Registration Statement. We have also examined the originals, or duplicates or certified or conformed copies, of such records, agreements, instruments and other documents and have made such other and further investigations as we have deemed relevant and necessary in connection with the opinions expressed herein. As to questions of fact material to the opinion set forth below, we have relied upon certificates of public officials and of officers and representatives of the Company.

In rendering the opinion set forth below, we have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as duplicates or certified or conformed copies and the authenticity of the originals of such latter documents. We have also assumed that the Indenture is the valid and legally binding obligation of the Trustee.

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion that the Notes are valid, binding and legal obligations of the Company, except as may be limited or otherwise affected by bankruptcy, insolvency, reorganization,

------

Troutman Pepper Locke LLP

September 19, 2025

moratorium and other similar laws relating to or affecting creditors' rights generally and by general principles of equity, whether considered in a proceeding at law or in equity.

We do not express any opinion concerning any law other than the law of the State of New York.

This opinion letter is furnished for your benefit in connection with your rendering an opinion to the Company to be filed as Exhibit 5.1 to the Registration Statement and we hereby consent to your attaching this opinion letter as an annex to such opinion. This opinion letter may not be relied upon by you for any other purpose, or quoted to or relied upon by any other person, firm or entity for any purpose, without our prior written consent. In giving our consent to your attaching this opinion letter to the opinion being rendered by you, we do not hereby admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Commission thereunder.

Very truly yours,

/s/ Hunton Andrews Kurth LLP

## Exhibit 8.1

Exhibit 8.1(a)

[Letterhead of Troutman Pepper Locke LLP]

September 19, 2025

Southern Power Company

30 Ivan Allen Jr. Blvd., N.W.

Atlanta, Georgia 30308

Re: Registration Statement on Form S-3

Ladies and Gentlemen:

We have acted as counsel to Southern Power Company, a Delaware corporation (the "Company"), in connection with the preparation and filing by the Company of a Registration Statement on Form S-3 (Registration Statement No. 333-289172) (the "Registration Statement"), including the Prospectus dated August 8, 2025 (the "Prospectus") included in the Registration Statement, and a Prospectus Supplement dated September 16, 2025 (the "Prospectus Supplement"), each as filed with the Securities and Exchange Commission (the "Commission") under the Securities Act of 1933, as amended (the "Act"). The Prospectus and the Prospectus Supplement describe the Company's offer to sell $550,000,000 aggregate principal amount of the Company's Series 2025A 4.25% Senior Notes due October 1, 2030 (the "Notes"). This opinion relates to the discussion set forth under the caption "MATERIAL UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS FOR NON-UNITED STATES HOLDERS" of the Prospectus Supplement. All capitalized terms used but not defined herein shall have the meanings ascribed to them in the Prospectus Supplement.

In connection with the preparation of our opinion, we have examined such documents and other materials as we have deemed appropriate, including, but not limited to, the Prospectus and the Prospectus Supplement. We have also examined originals or copies, certified or otherwise identified to our satisfaction, of such corporate records, officer's certificates and other documents and have made such investigations of law as we have deemed necessary or appropriate as a basis for the opinion expressed below. Our opinion assumes (i) the accuracy of the facts contained in the Prospectus and the Prospectus Supplement and other materials examined by us and (ii) the consummation of the offer to sell the Notes in the manner contemplated by, and in accordance with the terms set forth in, the Prospectus and the Prospectus Supplement.

Based upon and subject to the foregoing, the discussion contained in the Prospectus Supplement under the caption "MATERIAL UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS FOR NON-UNITED STATES HOLDERS," subject to the limitations described therein, constitutes the opinion of Troutman Pepper Locke LLP. There can be no assurance that changes in the law will not take place that could affect such United States federal income tax consequences, or that contrary positions may not be taken by the Internal Revenue Service. In the event any of the facts, statements, descriptions, covenants, representations,

------

September 19, 2025

warranties or assumptions upon which we have relied is incorrect, our opinion might be adversely affected and may not be relied upon.

Our opinion expresses our view only as to United States federal income tax laws in effect as of the date hereof. The authorities upon which our opinion relies are subject to change with potential retroactive effect. Nevertheless, by rendering this opinion we undertake no responsibility to advise you of any change in United States federal income tax laws or the application or interpretation thereof that could affect our opinion.

We hereby consent to the filing of this letter as an exhibit to the Registration Statement and to the reference to us in the Registration Statement under the caption "Legal Matters" and in the Prospectus and the Prospectus Supplement. By giving such consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.

&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;&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; Very truly yours,

&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;&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; /s/ Troutman Pepper Locke LLP

&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;&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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

## Exhibit 8.1

Exhibit 8.1(b)

[Letterhead of Troutman Pepper Locke LLP]

September 19, 2025

Southern Power Company

30 Ivan Allen Jr. Blvd., N.W.

Atlanta, Georgia 30308

Re: Registration Statement on Form S-3

Ladies and Gentlemen:

We have acted as counsel to Southern Power Company, a Delaware corporation (the "Company"), in connection with the preparation and filing by the Company of a Registration Statement on Form S-3 (Registration Statement No. 333-289172) (the "Registration Statement"), including the Prospectus dated August 8, 2025 (the "Prospectus") included in the Registration Statement, and a Prospectus Supplement dated September 16, 2025 (the "Prospectus Supplement"), each as filed with the Securities and Exchange Commission (the "Commission") under the Securities Act of 1933, as amended (the "Act"). The Prospectus and the Prospectus Supplement describe the Company's offer to sell $550,000,000 aggregate principal amount of the Company's Series 2025B 4.90% Senior Notes due October 1, 2035 (the "Notes"). This opinion relates to the discussion set forth under the caption "MATERIAL UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS FOR NON-UNITED STATES HOLDERS" of the Prospectus Supplement. All capitalized terms used but not defined herein shall have the meanings ascribed to them in the Prospectus Supplement.

In connection with the preparation of our opinion, we have examined such documents and other materials as we have deemed appropriate, including, but not limited to, the Prospectus and the Prospectus Supplement. We have also examined originals or copies, certified or otherwise identified to our satisfaction, of such corporate records, officer's certificates and other documents and have made such investigations of law as we have deemed necessary or appropriate as a basis for the opinion expressed below. Our opinion assumes (i) the accuracy of the facts contained in the Prospectus and the Prospectus Supplement and other materials examined by us and (ii) the consummation of the offer to sell the Notes in the manner contemplated by, and in accordance with the terms set forth in, the Prospectus and the Prospectus Supplement.

Based upon and subject to the foregoing, the discussion contained in the Prospectus Supplement under the caption "MATERIAL UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS FOR NON-UNITED STATES HOLDERS," subject to the limitations described therein, constitutes the opinion of Troutman Pepper Locke LLP. There can be no assurance that changes in the law will not take place that could affect such United States federal income tax consequences, or that contrary positions may not be taken by the Internal Revenue Service. In the event any of the facts, statements, descriptions, covenants, representations,

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September 19, 2025

warranties or assumptions upon which we have relied is incorrect, our opinion might be adversely affected and may not be relied upon.

Our opinion expresses our view only as to United States federal income tax laws in effect as of the date hereof. The authorities upon which our opinion relies are subject to change with potential retroactive effect. Nevertheless, by rendering this opinion we undertake no responsibility to advise you of any change in United States federal income tax laws or the application or interpretation thereof that could affect our opinion.

We hereby consent to the filing of this letter as an exhibit to the Registration Statement and to the reference to us in the Registration Statement under the caption "Legal Matters" and in the Prospectus and the Prospectus Supplement. By giving such consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.

&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;&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; Very truly yours,

&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;&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; /s/ Troutman Pepper Locke LLP

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