# EDGAR Filing Document

**Accession Number:** 0001004155
**File Stem:** 0001004155-25-000022
**Filing Date:** 2025-9
**Character Count:** 409319
**Document Hash:** 1d05565233a4ff52d32cd7fb8ee8af20
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001004155-25-000022.hdr.sgml**: 20250908

**ACCESSION NUMBER**: 0001004155-25-000022

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 25

**CONFORMED PERIOD OF REPORT**: 20250903

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20250908

**DATE AS OF CHANGE**: 20250908

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SOUTHERN CO GAS
- **CENTRAL INDEX KEY:** 0001004155
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATURAL GAS DISTRIBUTION [4924]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 582210952
- **STATE OF INCORPORATION:** GA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14174
- **FILM NUMBER:** 251299737

**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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SOUTHERN Co GAS
- **DATE OF NAME CHANGE:** 20160711

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AGL RESOURCES INC
- **DATE OF NAME CHANGE:** 19951129

?xml version='1.0' encoding='ASCII'? so-20250903

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 3, 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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| | | |
|:---|:---|:---|
| 1-14174 | **Southern Company Gas** | 58-2210952 |

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(A Georgia Corporation)

Ten Peachtree Place, N.E.

Atlanta, Georgia 30309

(404) 584-4000

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))

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

None

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 3, 2025, Southern Company Gas ("GAS") and Southern Company Gas Capital Corporation ("GAS Capital") entered into Underwriting Agreements covering the issue and sale of $425,000,000 aggregate principal amount of GAS Capital's Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Series 2025A Senior Notes") and $425,000,000 aggregate principal amount of GAS Capital's Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Series 2025B Senior Notes") and, in each case, the related guarantee thereof by GAS. The Series 2025A Senior Notes and the Series 2025B Senior Notes and the related guarantees thereof by GAS were registered under the Securities Act of 1933, as amended, pursuant to the shelf registration statement (Registration Nos. 333-285115 and 333-285115-01) of GAS and GAS Capital.

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

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| | |
|:---|:---|
| (d) Exhibits. | (d) Exhibits. |
| 1.1(a) | <u>[Underwriting Agreement relating to the Series](ex1-1asocogas2025axunderwr.htm)[2025A](ex1-1asocogas2025axunderwr.htm)[Senior Notes, dated September 3,](ex1-1asocogas2025axunderwr.htm)[2025](ex1-1asocogas2025axunderwr.htm)[, among GAS, GAS Capital and](ex1-1asocogas2025axunderwr.htm)[BMO Capital Markets Corp., MUFG Securities Americas Inc., Santander US Capital Markets LLC and U.S. Bancorp Investments, Inc.](ex1-1asocogas2025axunderwr.htm)[, as representatives of the several Underwriters named in Schedule I thereto.](ex1-1asocogas2025axunderwr.htm)</u> |
| 1.1(b) | <u>[Underwriting Agreement relating to the Series](ex1-1bsocogas2025bxunderwr.htm)[2025B](ex1-1bsocogas2025bxunderwr.htm)[Senior Notes, dated September 3, 2025, among GAS, GAS Capital and BMO Capital Markets Corp., MUFG Securities Americas Inc., Santander US Capital Markets LLC and U.S. Bancorp Investments, Inc., as representatives of the several Underwriters named in Schedule I thereto.](ex1-1bsocogas2025bxunderwr.htm)</u> |
| 4.1(a) | <u>[Form of the Series 2025A Senior Note.](ex4-1anotegas8xk2025asrnot.htm)</u> |
| 4.1(b) | <u>[Form of the Series 2025B Senior Note](ex4-1bnotegas8xk2025bsrnot.htm)</u>. |
| 4.3(a) | <u>[Form of Guarantee related to the Series 2025A Senior Notes](ex4-3aguaranteegas8xk2025a.htm)</u>. |
| 4.3(b) | <u>[Form of Guarantee related to the Series 2025B Senior Notes.](ex4-3bguaranteegas8xk2025b.htm)</u> |
| 5.1(a) | <u>[Opinion of Troutman Pepper Locke LLP relating to the Series 2025A Senior Notes](ex5-1agas2025asrnotes.htm)</u>. |
| 5.1(b) | <u>[Opinion of Troutman Pepper Locke LLP relating to the Series 2025B Senior Notes](ex5-1bgas2025bsrnotes.htm)</u>. |

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| | |
|:---|:---|
| 5.2(a) | <u>[Opinion of Balch & Bingham LLP relating to the Series 2025A Senior Notes.](ex5-2agas2025asnbbopinion.htm)</u> |
| 5.2(b) | <u>[Opinion of Balch & Bingham LLP relating to the Series 2025B Senior Notes](ex5-2bgas2025bsnbbopinion.htm)</u>. |
| 8.1(a) | <u>[Tax Opinion of Troutman Pepper Locke LLP relating to the Series 2025A Senior Notes.](ex8-1agas8xk2025asrnotes.htm)</u> |
| 8.1(b) | <u>[Tax Opinion of Troutman Pepper Locke LLP relating to the Series 2025B Senior Notes.](ex8-1bgas8xk2025asrnotes.htm)</u> |
| 23.1(a) | Consent of Troutman Pepper Locke LLP (included in Exhibit 5.1(a) above). |
| 23.1(b) | Consent of Troutman Pepper Locke LLP (included in Exhibit 5.1(b) above). |
| 23.2(a) | Consent of Balch & Bingham LLP (included in Exhibit 5.2(a) above). |
| 23.2(b) | Consent of Balch & Bingham LLP (included in Exhibit 5.2(b) above). |
| 23.3(a) | Consent of Troutman Pepper Locke LLP (included in Exhibit 8.1(a) above). |
| 23.3(b) | 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

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 8, 2025 | SOUTHERN COMPANY GAS | SOUTHERN COMPANY GAS |
|  | By: | /s/ Melissa K. Caen |
|  |  | Melissa K. Caen<br>Assistant Secretary |

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## Exhibit 1.1

Exhibit 1.1(a)

$425,000,000

Series 2025A 4.05% Senior Notes

due September 15, 2028

**SOUTHERN COMPANY GAS CAPITAL CORPORATION**

**<br>SOUTHERN COMPANY GAS**

**<br>UNDERWRITING AGREEMENT**

September 3, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022<br>U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters named in Schedule I hereto

Ladies and Gentlemen:

Southern Company Gas Capital Corporation (the "Company"), and Southern Company Gas (the "Guarantor"), each confirm their 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 $425,000,000 aggregate principal amount of the Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Senior Notes") as set forth in Schedule I hereto. The Senior Notes will be fully and unconditionally guaranteed by the Guarantor (the "Guarantee" and, together with the Senior Notes, the "Securities").

The Company and the Guarantor understand that the Underwriters propose to make a public offering of the Securities as soon as the Representatives deem advisable after this Agreement has been executed and delivered. The Securities will be issued pursuant to an Indenture, dated as of February 1, 2025 (the " Indenture"), by and among the Company, the Guarantor and U.S. Bank Trust Company, National Association, as trustee (the "Trustee").

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The Company is concurrently offering $425,000,000 aggregate principal amount of its Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Series 2025B Senior Notes"), pursuant to separate underwriting agreements 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 and the Guarantor jointly and severally represent and warrant 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 Nos. 333-285115 and 333-285115-01) in respect of the Securities 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, became 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 the Guarantor or related to the offering has been initiated or, to the best knowledge of the Company or the Guarantor, 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 Securities, 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, the Guarantor and the Underwriters for the Securities 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 Securities and certain other securities of the Company or the Guarantor, 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 Securities, being hereinafter called the "Base Prospectus"; the Base Prospectus as amended and supplemented by a preliminary prospectus supplement dated September 3, 2025 relating to the Securities 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 Securities 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 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,

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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 Guarantor 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 4:05 P.M. (New York time) on the date of this Agreement; the documents listed in Schedule II, taken together and attached hereto, are collectively referred to as the "Pricing Disclosure Package."

&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 and the Guarantor make 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 or the Guarantor 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 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

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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 neither the Company nor the Guarantor makes any warranty or representation with respect to (A) that part of the Registration Statement which shall constitute the Statements 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 or the Guarantor 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;Each Permitted Free Writing Prospectus listed on Schedule II 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 neither the Company nor the Guarantor makes any 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 or the Guarantor 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;With respect to the Registration Statement, (i) the Registration Statement is an "automatic shelf registration statement" (as defined in Rule 405 under the 1933 Act), (ii) neither the Company nor the Guarantor has received from the Commission any notice pursuant to Rule 401(g)(2) of the 1933 Act objecting to the use of the automatic shelf registration statement and (iii) 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;(A) At the time of filing of the Registration Statement, (B) at the time of the most recent amendment to the Registration Statement for the purposes of complying with Section 10(a)(3) of the 1933 Act (whether such amendment was by post-effective amendment, incorporated report filed pursuant to Section 13 or 15(d) of the 1934 Act or form of prospectus) and (C) at the time the Company, Guarantor or any person acting on their behalf (within the meaning, for this clause only, of Rule 163(c) under the 1933 Act) made any offer relating to the Securities in reliance on the exemption of Rule 163 under the 1933 Act, each of the Company and the Guarantor was a "well-known seasoned 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;At the determination date for purposes of the Securities within the meaning of Rule 164(h) under the 1933 Act, neither the Company nor the Guarantor was an "ineligible issuer" as defined in Rule 405 under the 1933 Act.

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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;(h)&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 Guarantor and its subsidiaries considered as one enterprise, 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;(i)&nbsp;&nbsp;&nbsp;&nbsp;Each of the Company and the Guarantor has been duly incorporated and is validly existing and in good standing as a corporation under the laws of its respective state of incorporation and has due corporate authority to conduct the business in which it is engaged and to own and operate any 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 Securities 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;(j)&nbsp;&nbsp;&nbsp;&nbsp;This Agreement has been duly authorized, executed and delivered by the Company and the Guarantor.

&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 Indenture has been duly authorized, executed and delivered by the Company and the Guarantor and constitutes a valid and binding obligation of the Company and the Guarantor, enforceable against the Company and the Guarantor 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) (prior clauses (1) and (2), taken together, 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;(l)&nbsp;&nbsp;&nbsp;&nbsp;The Guarantee has been duly authorized by the Guarantor and when duly executed, issued and delivered as provided for in the Indenture, will constitute a valid and binding agreement of the Guarantor, enforceable against the Guarantor in accordance with its terms, except to the extent that enforcement thereof may be limited by the Enforceability Exceptions, and 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 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;(m)&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 Pricing Disclosure Package and the Final Supplemented Prospectus.

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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;(n)&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Guarantor are not and, after giving effect to the offering and sale of the Securities and the application of proceeds therefrom, neither will be an "investment company" or an entity "controlled" by an "investment company" within the meaning of the Investment Company Act of 1940, 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;(o)&nbsp;&nbsp;&nbsp;&nbsp;The execution, delivery and performance by the Company and the Guarantor of this Agreement, the Indenture and the Securities and the consummation by the Company and the Guarantor of the transactions contemplated herein and therein and compliance by the Company and the Guarantor with their obligations hereunder and thereunder shall have been duly authorized by all necessary corporate action on the part of the Company and the Guarantor and do not and will not result in any violation of the charter or bylaws of the Company or the Guarantor, 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 or the Guarantor under (A) any contract, indenture, mortgage, loan agreement, note, lease or other agreement or instrument to which the Company or the Guarantor 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 the Guarantor 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 the Guarantor, or any of their 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;(p)&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 and the Guarantor of the Securities or the transactions by the Company and the Guarantor contemplated in this Agreement, except (A) such as may be required under the 1933 Act or the rules and regulations thereunder; (B) the qualification of the Indenture under the 1939 Act; and (C) such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or "blue sky" laws.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(q)&nbsp;&nbsp;&nbsp;&nbsp;The financial statements of the Guarantor 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 Guarantor and its subsidiaries 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 Guarantor incorporated by reference in the Registration Statement.

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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;(r)&nbsp;&nbsp;&nbsp;&nbsp;Neither the Company nor the Guarantor nor, to the knowledge of the Company and the Guarantor, any director, officer, agent, employee or subsidiary of the Company or the Guarantor, 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 Guarantor 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.

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 and the Guarantor agree to sell to each Underwriter, severally and not jointly, and each Underwriter, severally and not jointly, agrees to purchase from the Company and the Guarantor, the principal amount of the Securities set forth in Schedule I to this Agreement opposite the name of such Underwriter (plus any additional amount of Securities that such Underwriter may become obligated to purchase pursuant to the provisions of Section 11 hereof) at a price equal to 99.539% 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 certificate(s) for the Securities shall be made at the offices of Southern Company Services, Inc., 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308 at 10:00 A.M., New York time, on September 8, 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 and the Guarantor (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 Securities to MUFG Securities Americas Inc. on behalf of all of the Underwriters. It is understood that each Underwriter has authorized MUFG Securities Americas Inc., for each Underwriter's account, to accept delivery of, receipt for, and make payment of, the principal amount of the Securities which each Underwriter has agreed to purchase. MUFG Securities Americas Inc., individually and not as a representative of the Underwriters, may (but shall not be obligated to) make payment of the principal amount of the Securities 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 Securities 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 Securities 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 Securities, directly or indirectly, or distribute the Pricing Prospectus, the Final Supplemented Prospectus or any other offering material relating to the Securities, in or from any jurisdiction except under

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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 or the Guarantor except as set forth in this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter will sell the Securities 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*.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;&nbsp;&nbsp;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 Securities.

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;(iv)&nbsp;&nbsp;&nbsp;&nbsp;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 Securities.

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 Securities 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 Securities in, from or otherwise involving the UK.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter will not offer or sell any Securities, 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

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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;(vi)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter represents and agrees that the Securities 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 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;(vii)&nbsp;&nbsp;&nbsp;&nbsp;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 Securities, the Securities 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;(viii)&nbsp;&nbsp;&nbsp;&nbsp;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 Securities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ix)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter has not registered and will not register the Securities 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 Securities may not be sold, issued or offered within Taiwan through a public offering or in circumstances which constitute 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 Securities in Taiwan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter has not publicly offered, sold, promoted or advertised the Securities, and will not publicly offer, sell, promote or advertise the Securities, 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.

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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 and the Guarantor represent and agree that, without the prior consent of the Representatives, they have not made and will not make any offer relating to the Securities that would constitute a "free writing prospectus" as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus; each Underwriter, severally and not jointly, represents and agrees that, without the prior consent of the Company, the Guarantor and the Representatives, it has not made and will not make any offer relating to the Securities that would constitute a "free writing prospectus" as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus or a free writing prospectus that is not required to be filed by the Company or the Guarantor pursuant to Rule 433 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 Securities (the "Pricing Term Sheet"); any such free writing prospectus (which shall include the Pricing Term Sheet), the use of which has been consented to by the Company, the Guarantor and the Representatives is listed on Schedule II 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 and the Guarantor agree 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, the Guarantor 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 and the Guarantor agree that if at any time following issuance of a Permitted Free Writing Prospectus any event occurred or occurs as a result of which such Permitted 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 and the Guarantor 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 made in reliance upon and in conformity with information furnished in writing to the Company or the Guarantor 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 and the Guarantor agree 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 and the Guarantor will notify the Representatives so that any use of the Pricing Disclosure Package may cease until it is amended or supplemented.

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SECTION 4.&nbsp;&nbsp;&nbsp;&nbsp;<u>COVENANTS OF THE COMPANY AND THE GUARANTOR</u>. The Company and the Guarantor covenant 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 and the Guarantor, 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 or the Guarantor is advised thereof, they will advise the Representatives orally of the issuance of any stop order under the 1933 Act with respect to the Registration Statement, or the institution of any proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or the Guarantor or related to the offering, of which the Company or the Guarantor 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 and the Guarantor 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 and the Guarantor 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 Securities 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 Securities by an Underwriter, any event relating to or affecting the Company or the Guarantor, or of which the Company and the Guarantor shall be advised in writing by the Representatives, shall occur, which in the opinion of the Company, the Guarantor 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 and the Guarantor forthwith will (i) notify the Underwriters to suspend solicitation of purchases of the Securities 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 Securities after the expiration of the period specified in the preceding sentence, the Company or the Guarantor, upon the request of such Underwriter, will furnish to such Underwriter, at the expense of such

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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 and the Guarantor 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 and the Guarantor will endeavor, in cooperation with the Underwriters, to qualify the Securities for offering and sale under the applicable securities laws of such states and the other jurisdictions of the United States as the Representatives may designate; provided, however, that neither the Company nor the Guarantor shall 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 or the Guarantor 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 and the Guarantor will make generally available to their 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 Guarantor (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 Guarantor'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 and the Guarantor 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 and the Guarantor 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, neither the Company nor the Guarantor will, 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;If at any time when Securities remain unsold by the Underwriters, the Company or the Guarantor receives from the Commission a notice pursuant to Rule 401(g)(2) under the 1933 Act or otherwise cease to be eligible to use the automatic shelf registration statement form, the Company and the Guarantor will (i) promptly notify the Representatives, (ii) promptly file a new registration statement or post-effective amendment on the proper form relating to the Securities, in a form satisfactory to the Representatives, (iii) use their reasonable best efforts

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to cause such registration statement or post-effective amendment to be declared effective and (iv) promptly notify the Representatives of such effectiveness. The Company and the Guarantor will take all other reasonable action necessary or appropriate to permit the public offering and sale of the Securities to continue as contemplated in the registration statement that was the subject of the Rule 401(g)(2) notice or for which the Company or the Guarantor has otherwise become ineligible. References herein to the Registration Statement shall include such new registration statement or post-effective amendment, as the case may be.

SECTION 5.&nbsp;&nbsp;&nbsp;&nbsp;<u>PAYMENT OF EXPENSES</u>. The Company and the Guarantor will pay all expenses incidental to the performance of their 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 Securities, (iii) the fees and disbursements of the Company's and the Guarantor's counsel and accountants, (iv) the qualification of the Securities 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 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 Securities, (ix) any fees payable in connection with the rating of the Securities, (x) the cost and charges of any transfer agent or registrar and (xi) the cost of qualifying the Securities with The Depository Trust Company.

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 Securities, 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 Securities 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 the Guarantor or related to the offering shall be pending before, or to the knowledge of the Company or the Guarantor 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 and the Guarantor pursuant to Rule 433(d) under the 1933 Act, shall have been filed by the Company and the

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Guarantor 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;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;(1)&nbsp;&nbsp;&nbsp;&nbsp;The opinion, dated the Closing Date, of Balch & Bingham LLP, counsel for the Company, substantially in the form 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;(2)&nbsp;&nbsp;&nbsp;&nbsp;The opinion and related disclosure letter, each dated the Closing Date, of Troutman Pepper Locke LLP, counsel for the Company and the Guarantor, substantially in the forms attached hereto as Schedule IV.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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, dated the Closing Date, of Emmet, Marvin & Martin, LLP, counsel to the Trustee, substantially in the form 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)&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 VI.

&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;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;(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 Guarantor, 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 Guarantor, 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 Guarantor 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 Guarantor or related to the offering have been initiated or, to the knowledge of the Guarantor, threatened by the Commission.

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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;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 Guarantor within the meaning of the 1933 Act and the rules and regulations under the 1933 Act; (B) in their opinion, the financial statements of the Guarantor 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 Guarantor; (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 Guarantor, 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 Guarantor, 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 Guarantor 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 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 Company Gas 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 Guarantor 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 Guarantor or any decrease in net assets of the Guarantor 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

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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 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 Company Gas 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 Guarantor 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 Securities 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 and the Guarantor in connection with the issuance and sale of the Securities 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 reasonable judgment of the Representatives, shall materially impair the marketability of the Securities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h)&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Guarantor shall have performed their 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 and the Guarantor 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 AND THE GUARANTOR</u>. The obligations of the Company and the Guarantor shall be subject to the conditions set forth in the first sentence of Section 6(a) hereof. In case such conditions shall not have been fulfilled, this Agreement may be terminated by the Company or the Guarantor by mailing or delivering written notice thereof to the Representatives. Any such termination shall be

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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 and the Guarantor jointly and severally agree 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 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 or the Guarantor 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 any Preliminary Prospectus, the Registration Statement, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus, or the Final Supplemented Prospectus as so amended or supplemented, or in any free writing prospectus used by the Company or the Guarantor other than a Permitted 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 Registration Statement, Preliminary Prospectus, 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 or the Guarantor 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 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 and the Guarantor of any such action shall not release the Company or the Guarantor 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 and the Guarantor of the commencement thereof as above provided, the Company and the Guarantor 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 or the Guarantor 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 and the Guarantor 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

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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 and the Guarantor, its directors and such of its officers who have signed the Registration Statement and each person, if any, who controls the Company or the Guarantor 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 and the Guarantor set forth in Section 8(a) hereof, but only with respect to alleged untrue statements or omissions made in 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 or the Guarantor 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 and the Guarantor 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 or the Guarantor and shall survive delivery of the Securities to the Underwriters.

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 and the Guarantor, 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 Securities 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 or the

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Guarantor to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company or the Guarantor shall be unable to perform its obligations under this Agreement, then in any such case, the Company and the Guarantor 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 Securities and, upon such reimbursement, the Company and the Guarantor 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 Securities 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 Securities, 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 Securities, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

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, the Company or the Guarantor 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, MUFG Securities Americas Inc., 1221 Avenue of the Americas, 6th Floor, New York, New York 10020, Attention: Capital Markets Group, Fax No.: (646) 434-3455, Santander US Capital Markets LLC, 437 Madison Avenue, New York, New York 10022, Fax: 212-407-0930, Attention: Debt Capital Markets and U.S. Bancorp Investments, Inc., 214 North Tryon Street, 26th Floor, Charlotte, North Carolina 28202, Attention: Investment Grade Syndicate, Fax No.: (877) 774-3462; 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

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Southern Company Services, Inc., 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308, Attention: J. Seth Blocker.

In accordance with the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)), the Underwriters are required to obtain, verify and record information that identifies their respective clients, including the Company and the Guarantor, which information may include the name and address of their respective clients, as well as other information that will allow the Underwriters to properly identify their respective clients.

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 the Guarantor 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 the Guarantor 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 the Guarantor 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 Securities from any of the Underwriters shall be deemed to be a successor by reason merely of such purchase. The Company and the Guarantor acknowledge and agree that in connection with all aspects of each transaction contemplated by this Agreement, the Company and the Guarantor 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 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

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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;(1)&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;(2)&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;(3)&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.

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

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Very truly yours,

SOUTHERN COMPANY GAS CAPITAL CORPORATION

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Brian T. Arnberger&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Brian T. Arnberger

Title: Assistant Treasurer

SOUTHERN COMPANY GAS

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Brian T. Arnberger&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Brian T. Arnberger

Title: Assistant Treasurer

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CONFIRMED AND ACCEPTED,<br>as of the date first above written

BMO CAPITAL MARKETS CORP.

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Mark Spadaccini&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Mark Spadaccini

Title: Managing Director

MUFG SECURITIES AMERICAS INC.

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Maheen Baig&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Maheen Baig

Title: Managing Director

SANTANDER US CAPITAL MARKETS LLC

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Richard Zobkiw&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Richard Zobkiw

Title: Executive Director

U.S. BANCORP INVESTMENTS, INC.

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Brent Kreissl&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Brent Kreissl

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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| | |
|:---|:---|
| Name of Underwriters | Principal Amount of Securities |
| BMO Capital Markets Corp. | $72250000 |
| MUFG Securities Americas Inc. | 72250000 |
| Santander US Capital Markets LLC | 72250000 |
| U.S. Bancorp Investments, Inc. | 72250000 |
| BBVA Securities Inc. | 21250000 |
| BNY Mellon Capital Markets, LLC | 21250000 |
| CIBC World Markets Corp. | 21250000 |
| Huntington Securities, Inc. | 21250000 |
| Intesa Sanpaolo IMI Securities Corp. | 21250000 |
| TD Securities (USA) LLC | 21250000 |
| MFR Securities, Inc. | 4250000 |
| Siebert Williams Shank & Co., LLC | 4250000 |
| **TOTAL:** | $425000000 |

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Schedule I-1

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**SCHEDULE II**

**PRICING DISCLOSURE PACKAGE**

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| | |
|:---|:---|
| 1) | Prospectus dated February 21, 2025 |
| 2) | Preliminary Prospectus Supplement dated September 3, 2025 (which shall be deemed to 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 |

---

Schedule II-1

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Schedule III

[Letterhead of BALCH & BINGHAM LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025A 4.05% Senior Notes<br>due September 15, 2028

Ladies and Gentlemen:

We have acted as special Alabama counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), in connection with (i) the Company's issuance of $425,000,000 aggregate principal amount of its Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Notes") and the related guarantee thereof (the "Guarantee") by Southern Company Gas (the "Guarantor") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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(b)(1) of the Underwriting Agreement.

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

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;a)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor 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;b)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor 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;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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus supplement dated September 3, 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 Guarantor dated September 3, 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;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;f)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Guarantee;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g)&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;h)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus pertaining to the Notes prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i)&nbsp;&nbsp;&nbsp;&nbsp;The Company's Articles of Incorporation, as filed with the Nevada Secretary of State's Office on September 15, 2000, as amended by Certificate of Amendment filed with the Nevada Secretary of State's office on July 19, 2016 and as further amended by the Certificate of Incorporation filed with the Alabama Secretary of State's office on December 26, 2024 (as so amended, the "Certificate of Incorporation");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;j)&nbsp;&nbsp;&nbsp;&nbsp;A copy of the Bylaws of the Company as adopted December 31, 2024 (the "Bylaws");

Schedule III-2

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;k)&nbsp;&nbsp;&nbsp;&nbsp;A Certificate of Good Standing for the Company issued by the Alabama Secretary of State on September 3, 2025;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;l)&nbsp;&nbsp;&nbsp;&nbsp;Unanimous Written Consent of the Board of Directors of the Company dated February 19, 2025, authorizing and approving the Registration Statement, the issuance and sale of the securities described in the Registration Statement and matters related thereto;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m)&nbsp;&nbsp;&nbsp;&nbsp;Unanimous Written Consent of the Board of Directors of the Company dated February 19, 2025, authorizing the Notes;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;n)&nbsp;&nbsp;&nbsp;&nbsp;Certificate of Marcia R. DeMar, Corporate Secretary of the Company, dated as of September 8, 2025 (the "Officer's Certificate"); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o)&nbsp;&nbsp;&nbsp;&nbsp;Officers' Certificate Pursuant to Section 301 of the Indenture of Grace A. Kolvereid, Executive Vice President, Chief Financial Officer, Chief Risk Officer and Treasurer of the Company and Marcia R. DeMar, Corporate Secretary, dated September 8, 2025, establishing the Notes as a series of securities to be issued under the Indenture with the terms and characteristics as described therein.

The documents listed in Schedule II 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 certificate representing the Notes, of which we have examined a specimen), 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.

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 Alabama and has due corporate authority to own its properties and conduct its business as described in the Pricing Disclosure Package and the 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;2.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized by the Company, and relying solely on the Officer's Certificate, has been 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;The Notes have been duly authorized by the Company, have been executed by the Company and, when received by the Trustee, will be delivered by the Company.

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;4.&nbsp;&nbsp;&nbsp;&nbsp;The Underwriting Agreement has been duly authorized by the Company, has been executed by the Company and, when received by the Representatives, will be 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;5.&nbsp;&nbsp;&nbsp;&nbsp;No order, consent or other authorization or approval is required by any governmental authority of the State of Alabama for the issuance by the Company of the Notes, except with respect to applicable state securities or "blue sky" laws, as to which we express no opinion.

&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;The execution and delivery by the Company of the Underwriting Agreement, and the Notes do not, and if the Company were now to perform its obligations under the Underwriting Agreement, the Indenture and the Notes such performance would not, result in any: (i) violation of the Company's Certificate of Incorporation or Bylaws; (ii) violation of any existing State of Alabama statute, regulation, rule or law to which the Company is subject; or (iii) violation of any judicial or administrative decree, writ, judgment or order to which, to the knowledge of such counsel, the Company is subject.

The attorneys in this firm that are rendering this opinion are members of the State Bar of Alabama and we do not purport to express any opinion herein concerning any law other than the laws of the State of Alabama.

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 in giving its opinion pursuant to the Underwriting Agreement, insofar as such opinion relates to matters of Alabama law and Hunton Andrews Kurth LLP may rely on this opinion in giving its opinion pursuant to the Underwriting Agreement, insofar as such opinion relates to matters of Alabama law. This opinion 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,<br>

BALCH & BINGHAM LLP

Schedule III-4

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Schedule IV

[Letterhead of TROUTMAN PEPPER LOCKE LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025A 4.05% Senior Notes<br>due September 15, 2028

Ladies and Gentlemen:

We have acted as counsel to Southern Company Gas, a Georgia corporation (the "Guarantor"), and as special counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), in connection with: (i) the offer and sale by the Company of its Series 2025A 4.05% Senior Notes due September 15, 2028 in the aggregate principal amount of $425,000,000 (the "Notes") and the related guarantee thereof by the Guarantor (the "Guarantee", and together with the Notes, the "Securities") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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(b)(2) of the Underwriting Agreement.

Schedule IV-1

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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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor 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;b)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor 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;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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus supplement dated September 3, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company and the Guarantor 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 Guarantor dated September 3, 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;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;f)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Officer's Certificate pursuant to Section 301 of the Indenture;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g)&nbsp;&nbsp;&nbsp;&nbsp;A specimen of global note No. DD-1 representing the Notes (the "Global Note");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Guarantee;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i)&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;j)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus pertaining to the Notes prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus");

Schedule IV-2

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;k)&nbsp;&nbsp;&nbsp;&nbsp;The Guarantor's charter and bylaws; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;l)&nbsp;&nbsp;&nbsp;&nbsp;Such other corporate and other documents, records and certificates as we considered necessary or appropriate, including certificates of public officials and officers of the Company and the Guarantor.

The documents listed in Schedule II 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 certificate representing the Notes, of which we have examined a specimen), 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, (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 and (v) the authority of the person or persons who executed any such documents on behalf of any person or entity (other than the Company and the Guarantor).

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 Guarantor is a corporation validly existing and in good standing under the law of the State of Georgia, and has the corporate authority to conduct its business as described in the Pricing Disclosure Package and the Final Supplemented Prospectus, to own and operate any properties used by it in such business and to enter into and perform its obligations under the Agreements and the Guarantee.

&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 Guarantor of the Underwriting Agreement have been duly authorized by all necessary corporate action on the part of the Guarantor, and the Underwriting Agreement has been duly executed and delivered by the Guarantor.

&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 Commission legally required for the issuance and sale of the Securities have been obtained; such orders are sufficient for the issuance and sale of the Securities in accordance with the terms of the Agreements; the issuance and sale of the Securities conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval pursuant to any Georgia or 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 Securities in accordance with the terms of the Underwriting Agreement.

Schedule IV-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;4.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized by all necessary corporate action on the part of the Guarantor, executed and delivered by the Guarantor and is enforceable against the Guarantor and the Company in accordance with its terms, subject to the qualifications that the enforceability of the Guarantor's and 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, when the Global Note is 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;The Guarantee has been duly authorized by all necessary corporate action on the part of the Guarantor, executed and delivered by the Guarantor and is enforceable against the Guarantor in accordance with its terms, subject to the qualifications that the enforceability of the Guarantor's obligations under the Guarantee 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;7.&nbsp;&nbsp;&nbsp;&nbsp;Each of the Indenture, the Guarantee 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;8.&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;9.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Guarantor of the Underwriting Agreement, the Indenture, and the Guarantee, and the consummation of the transactions contemplated thereby, do not result in any violation of: (i) the charter or bylaws of the Guarantor or (ii) any existing applicable law, rule or regulation of the United States or the State of Georgia.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Company of the Underwriting Agreement, the Indenture and the Global Note, and the consummation of the transactions contemplated thereby, do not result in any violation of any existing applicable law, rule or regulation of the United States or the State of Georgia.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Guarantor are not and, after giving effect to the offering and sale of the Securities, neither will be an "investment company" or a company "controlled" by an "investment company" within the meaning of the Investment Company Act of 1940, as amended.

Schedule IV-4

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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;12.&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, limitations and assumptions set forth therein.

The attorneys in this firm that are rendering this opinion are members of the State Bar of Georgia and we do not purport to express any opinion herein concerning any law other than the law of the State of Georgia, the federal law of the United States and, to the extent set forth herein, the law of the State of New York. As to all matters governed by or dependent upon the law 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. As to all matters governed by or dependent upon the law of the State of Alabama, we have, with your consent, relied upon the opinion of Balch & Bingham 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 Representatives of the 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 Hunton Andrews Kurth LLP may rely on this opinion in giving its opinion pursuant to the Underwriting Agreement, insofar as such opinion relates to matters of Georgia law. This opinion 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.

Sincerely,

Schedule IV-5

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[Letterhead of TROUTMAN PEPPER LOCKE LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025A 4.05% Senior Notes<br>due September 15, 2028

Ladies and Gentlemen:

We have acted as counsel to Southern Company Gas, a Georgia corporation (the "Guarantor"), and as special counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), in connection with: (i) the offer and sale by the Company of its Series 2025A 4.05% Senior Notes due September 15, 2028 in the aggregate principal amount of $425,000,000 (the "Notes") and the related guarantee thereof by the Guarantor (the "Guarantee") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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(b)(2) of the Underwriting Agreement.

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

Schedule IV-6

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In connection with the foregoing, we have examined the Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement"); the Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act; 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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents"); and the Company's and the Guarantor's prospectus supplement dated September 3, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company and the Guarantor 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 Guarantor dated September 3, 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 prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 under the Act (the "Permitted Free Writing Prospectus"). The documents listed in Schedule II to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

We have participated in various conferences with the Company and the Guarantor, their representatives, representatives of the independent public or certified public accountants of the Guarantor, representatives of you 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 7 and 12 of our opinion to you 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;1.&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;2.&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

Schedule IV-7

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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;3.&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, 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 3, 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 Representatives of the 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.

Sincerely,

Schedule IV-8

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Schedule V

[Letterhead of Emmet, Marvin & Martin, LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

as Representatives of the Several Underwriters

Southern Company Gas Capital Corporation

3535 Colonnade Parkway

Birmingham, Alabama 35243

Southern Company Gas

Ten Peachtree Place, N.E.

Atlanta, Georgia 30309

Southern Company Gas Capital Corporation<br>Southern Company Gas<br><u>Series 2025A 4.05% Senior Notes due September 15, 2028</u>

Ladies and Gentlemen:

We have acted as counsel to U.S. Bank Trust Company, National Association, in connection with the issuance by Southern Company Gas Capital Corporation (formerly known as AGL Capital Corporation) (the "Company") of $425,000,000 aggregate principal amount of Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Senior Notes") and the related guarantee thereof by Southern Company Gas (formerly known as AGL Resources Inc.) (the "Guarantor"), pursuant to the Indenture, dated as of February 1, 2025 (the "Indenture"), among the Company, the Guarantor and U.S. Bank Trust Company, National Association, as trustee (in such capacity, the "Trustee").

Schedule V-1

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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 the Trustee and of public officials. In such review, 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 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 the Trustee has been duly formed and that the Indenture constitutes a 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, the Trustee 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 constitutes a valid and binding agreement of the Trustee enforceable against the Trustee 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 based as 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 Senior 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.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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,

Schedule V-2

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Schedule VI

[Letterhead of HUNTON ANDREWS KURTH LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025A 4.05% Senior Notes<br>due September 15, 2028

To the Addressees:

We have acted as counsel to you in connection with (i) the issuance and sale by Southern Company Gas Capital Corporation (the "Company") of $425,000,000 aggregate principal amount of its Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Notes") and the related guarantee thereof (the "Guarantee" and, together with the Notes, the "Securities") by Southern Company Gas (the "Guarantor") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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(b)(4) of the Underwriting Agreement.

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

Schedule VI-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;a)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor 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;b)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor 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;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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus supplement dated September 3, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company and the Guarantor 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 Guarantor dated September 3, 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;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;f)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Guarantee;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g)&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;h)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 under the Act (the "Permitted Free Writing Prospectus"); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's charter and bylaws.

The documents listed in Schedule II 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 certificate representing the Notes, of which we have examined a specimen), and we have made such other and further investigations as we

Schedule VI-2

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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.

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 Guarantor is a corporation validly existing and in good standing under the law of the State of Georgia, and has the corporate authority to conduct its business as described in the Pricing Disclosure Package and the Final Supplemented Prospectus, to own and operate any properties used by it in such business and to enter into and perform its obligations under the Agreements and the Guarantee.

&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 and the Guarantor 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 and the Guarantor.

&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 Commission legally required for the issuance and sale of the Securities have been obtained; such orders are sufficient for the issuance and sale of the Securities in accordance with the terms of the Agreements; the issuance and sale of the Securities conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval of any New York or 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 Securities 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 the Guarantor and, assuming the due authorization, execution and delivery thereof by the Trustee, constitutes a valid and legally binding instrument of the Company and the Guarantor, enforceable against the Company and the Guarantor in accordance with its terms, subject to the qualifications that the enforceability of the Company's and the Guarantor'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

Schedule VI-3

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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;The Guarantee has been duly authorized by all necessary corporate action on the part of the Guarantor, executed and delivered by the Guarantor and is enforceable against the Guarantor in accordance with its terms, except as the enforcement thereof may be limited 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;7.&nbsp;&nbsp;&nbsp;&nbsp;Each of the Indenture, the Guarantee 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;8.&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;9.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Company and the Guarantor of the Underwriting Agreement, the Indenture, the Guarantee and the Notes, and the consummation of the transactions contemplated thereby, do not result in any violation of (i) the charter or bylaws of the Company or the Guarantor or (ii) any existing applicable law, rule or regulation of the United States or the State of New York.

We do not purport to express any opinion herein concerning any law other than the laws of the State of New York and the federal laws of the United States and, to the extent set forth herein, the laws of the State of Georgia and the State of Alabama. As to all matters governed by or dependent upon the laws of the State of Georgia, we have, with your consent, relied upon the opinion letter of Troutman Pepper Locke LLP dated the date hereof and addressed to you. As to all matters governed by or dependent upon the laws of the State of Alabama, we have, with your consent, relied upon the opinion of Balch & Bingham LLP dated the date hereof and addressed to you.

Schedule VI-4

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This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Representatives of the 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 Balch & Bingham LLP and Troutman Pepper Locke LLP may rely on this opinion letter in giving their opinions pursuant to Section 6 of the Underwriting Agreement and pursuant to 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,<br>HUNTON ANDREWS KURTH LLP

Schedule VI-1

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[Letterhead of HUNTON ANDREWS KURTH LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025A 4.05% Senior Notes<br>due September 15, 2028

To the Addressees:

We have acted as counsel to you in connection with (i) the issuance and sale by Southern Company Gas Capital Corporation (the "Company") of $425,000,000 aggregate principal amount of its Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Notes") and the related guarantee thereof (the "Guarantee" and, together with the Notes, the "Securities") by Southern Company Gas (the "Guarantor") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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 in your capacity as Representatives pursuant to Section 6(b)(4) of the Underwriting Agreement.

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

Schedule VI-2

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In connection with the foregoing, we have examined the Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement"); the Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act; 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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents"); and the Company's and the Guarantor's prospectus supplement dated September 3, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company and the Guarantor 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 Guarantor dated September 3, 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 prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 under the Act (the "Permitted Free Writing Prospectus"). The documents listed in Schedule II to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

We have participated in various conferences with the Company and the Guarantor, their counsel, their representatives and representatives of the independent public or certified public accountants of the Guarantor 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 7 of our opinion letter to you 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

Schedule VI-3

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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, 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 3, 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 Representatives of the 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 VI-4

## Exhibit 1.1

Exhibit 1.1(b)

$425,000,000

Series 2025B 5.10% Senior Notes

due September 15, 2035

**SOUTHERN COMPANY GAS CAPITAL CORPORATION**

**<br>SOUTHERN COMPANY GAS**

**<br>UNDERWRITING AGREEMENT**

September 3, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022<br>U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters named in Schedule I hereto

Ladies and Gentlemen:

Southern Company Gas Capital Corporation (the "Company"), and Southern Company Gas (the "Guarantor"), each confirm their 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 $425,000,000 aggregate principal amount of the Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Senior Notes") as set forth in Schedule I hereto. The Senior Notes will be fully and unconditionally guaranteed by the Guarantor (the "Guarantee" and, together with the Senior Notes, the "Securities").

The Company and the Guarantor understand that the Underwriters propose to make a public offering of the Securities as soon as the Representatives deem advisable after this Agreement has been executed and delivered. The Securities will be issued pursuant to an Indenture, dated as of February 1, 2025 (the " Indenture"), by and among the Company, the Guarantor and U.S. Bank Trust Company, National Association, as trustee (the "Trustee").

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The Company is concurrently offering $425,000,000 aggregate principal amount of its Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Series 2025A Senior Notes"), pursuant to separate underwriting agreements 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 and the Guarantor jointly and severally represent and warrant 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 Nos. 333-285115 and 333-285115-01) in respect of the Securities 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, became 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 the Guarantor or related to the offering has been initiated or, to the best knowledge of the Company or the Guarantor, 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 Securities, 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, the Guarantor and the Underwriters for the Securities 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 Securities and certain other securities of the Company or the Guarantor, 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 Securities, being hereinafter called the "Base Prospectus"; the Base Prospectus as amended and supplemented by a preliminary prospectus supplement dated September 3, 2025 relating to the Securities 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 Securities 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 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,

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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 Guarantor 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 4:05 P.M. (New York time) on the date of this Agreement; the documents listed in Schedule II, taken together and attached hereto, are collectively referred to as the "Pricing Disclosure Package."

&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 and the Guarantor make 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 or the Guarantor 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 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

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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 neither the Company nor the Guarantor makes any warranty or representation with respect to (A) that part of the Registration Statement which shall constitute the Statements 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 or the Guarantor 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;Each Permitted Free Writing Prospectus listed on Schedule II 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 neither the Company nor the Guarantor makes any 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 or the Guarantor 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;With respect to the Registration Statement, (i) the Registration Statement is an "automatic shelf registration statement" (as defined in Rule 405 under the 1933 Act), (ii) neither the Company nor the Guarantor has received from the Commission any notice pursuant to Rule 401(g)(2) of the 1933 Act objecting to the use of the automatic shelf registration statement and (iii) 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;(A) At the time of filing of the Registration Statement, (B) at the time of the most recent amendment to the Registration Statement for the purposes of complying with Section 10(a)(3) of the 1933 Act (whether such amendment was by post-effective amendment, incorporated report filed pursuant to Section 13 or 15(d) of the 1934 Act or form of prospectus) and (C) at the time the Company, Guarantor or any person acting on their behalf (within the meaning, for this clause only, of Rule 163(c) under the 1933 Act) made any offer relating to the Securities in reliance on the exemption of Rule 163 under the 1933 Act, each of the Company and the Guarantor was a "well-known seasoned 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;At the determination date for purposes of the Securities within the meaning of Rule 164(h) under the 1933 Act, neither the Company nor the Guarantor was an "ineligible issuer" as defined in Rule 405 under the 1933 Act.

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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;(h)&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 Guarantor and its subsidiaries considered as one enterprise, 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;(i)&nbsp;&nbsp;&nbsp;&nbsp;Each of the Company and the Guarantor has been duly incorporated and is validly existing and in good standing as a corporation under the laws of its respective state of incorporation and has due corporate authority to conduct the business in which it is engaged and to own and operate any 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 Securities 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;(j)&nbsp;&nbsp;&nbsp;&nbsp;This Agreement has been duly authorized, executed and delivered by the Company and the Guarantor.

&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 Indenture has been duly authorized, executed and delivered by the Company and the Guarantor and constitutes a valid and binding obligation of the Company and the Guarantor, enforceable against the Company and the Guarantor 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) (prior clauses (1) and (2), taken together, 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;(l)&nbsp;&nbsp;&nbsp;&nbsp;The Guarantee has been duly authorized by the Guarantor and when duly executed, issued and delivered as provided for in the Indenture, will constitute a valid and binding agreement of the Guarantor, enforceable against the Guarantor in accordance with its terms, except to the extent that enforcement thereof may be limited by the Enforceability Exceptions, and 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 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;(m)&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 Pricing Disclosure Package and the Final Supplemented Prospectus.

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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;(n)&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Guarantor are not and, after giving effect to the offering and sale of the Securities and the application of proceeds therefrom, neither will be an "investment company" or an entity "controlled" by an "investment company" within the meaning of the Investment Company Act of 1940, 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;(o)&nbsp;&nbsp;&nbsp;&nbsp;The execution, delivery and performance by the Company and the Guarantor of this Agreement, the Indenture and the Securities and the consummation by the Company and the Guarantor of the transactions contemplated herein and therein and compliance by the Company and the Guarantor with their obligations hereunder and thereunder shall have been duly authorized by all necessary corporate action on the part of the Company and the Guarantor and do not and will not result in any violation of the charter or bylaws of the Company or the Guarantor, 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 or the Guarantor under (A) any contract, indenture, mortgage, loan agreement, note, lease or other agreement or instrument to which the Company or the Guarantor 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 the Guarantor 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 the Guarantor, or any of their 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;(p)&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 and the Guarantor of the Securities or the transactions by the Company and the Guarantor contemplated in this Agreement, except (A) such as may be required under the 1933 Act or the rules and regulations thereunder; (B) the qualification of the Indenture under the 1939 Act; and (C) such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or "blue sky" laws.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(q)&nbsp;&nbsp;&nbsp;&nbsp;The financial statements of the Guarantor 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 Guarantor and its subsidiaries 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 Guarantor incorporated by reference in the Registration Statement.

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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;(r)&nbsp;&nbsp;&nbsp;&nbsp;Neither the Company nor the Guarantor nor, to the knowledge of the Company and the Guarantor, any director, officer, agent, employee or subsidiary of the Company or the Guarantor, 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 Guarantor 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.

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 and the Guarantor agree to sell to each Underwriter, severally and not jointly, and each Underwriter, severally and not jointly, agrees to purchase from the Company and the Guarantor, the principal amount of the Securities set forth in Schedule I to this Agreement opposite the name of such Underwriter (plus any additional amount of Securities that such Underwriter may become obligated to purchase pursuant to the provisions of Section 11 hereof) at a price equal to 99.093% 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 certificate(s) for the Securities shall be made at the offices of Southern Company Services, Inc., 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308 at 10:00 A.M., New York time, on September 8, 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 and the Guarantor (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 Securities to MUFG Securities Americas Inc. on behalf of all of the Underwriters. It is understood that each Underwriter has authorized MUFG Securities Americas Inc., for each Underwriter's account, to accept delivery of, receipt for, and make payment of, the principal amount of the Securities which each Underwriter has agreed to purchase. MUFG Securities Americas Inc., individually and not as a representative of the Underwriters, may (but shall not be obligated to) make payment of the principal amount of the Securities 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 Securities 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 Securities 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 Securities, directly or indirectly, or distribute the Pricing Prospectus, the Final Supplemented Prospectus or any other offering material relating to the Securities, in or from any jurisdiction except under

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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 or the Guarantor except as set forth in this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter will sell the Securities 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*.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;&nbsp;&nbsp;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 Securities.

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;(iv)&nbsp;&nbsp;&nbsp;&nbsp;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 Securities.

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 Securities 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 Securities in, from or otherwise involving the UK.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter will not offer or sell any Securities, 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

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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;(vi)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter represents and agrees that the Securities 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 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;(vii)&nbsp;&nbsp;&nbsp;&nbsp;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 Securities, the Securities 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;(viii)&nbsp;&nbsp;&nbsp;&nbsp;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 Securities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ix)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter has not registered and will not register the Securities 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 Securities may not be sold, issued or offered within Taiwan through a public offering or in circumstances which constitute 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 Securities in Taiwan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x)&nbsp;&nbsp;&nbsp;&nbsp;Each Underwriter has not publicly offered, sold, promoted or advertised the Securities, and will not publicly offer, sell, promote or advertise the Securities, 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.

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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 and the Guarantor represent and agree that, without the prior consent of the Representatives, they have not made and will not make any offer relating to the Securities that would constitute a "free writing prospectus" as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus; each Underwriter, severally and not jointly, represents and agrees that, without the prior consent of the Company, the Guarantor and the Representatives, it has not made and will not make any offer relating to the Securities that would constitute a "free writing prospectus" as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus or a free writing prospectus that is not required to be filed by the Company or the Guarantor pursuant to Rule 433 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 Securities (the "Pricing Term Sheet"); any such free writing prospectus (which shall include the Pricing Term Sheet), the use of which has been consented to by the Company, the Guarantor and the Representatives is listed on Schedule II 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 and the Guarantor agree 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, the Guarantor 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 and the Guarantor agree that if at any time following issuance of a Permitted Free Writing Prospectus any event occurred or occurs as a result of which such Permitted 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 and the Guarantor 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 made in reliance upon and in conformity with information furnished in writing to the Company or the Guarantor 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 and the Guarantor agree 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 and the Guarantor will notify the Representatives so that any use of the Pricing Disclosure Package may cease until it is amended or supplemented.

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SECTION 4.&nbsp;&nbsp;&nbsp;&nbsp;<u>COVENANTS OF THE COMPANY AND THE GUARANTOR</u>. The Company and the Guarantor covenant 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 and the Guarantor, 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 or the Guarantor is advised thereof, they will advise the Representatives orally of the issuance of any stop order under the 1933 Act with respect to the Registration Statement, or the institution of any proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or the Guarantor or related to the offering, of which the Company or the Guarantor 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 and the Guarantor 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 and the Guarantor 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 Securities 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 Securities by an Underwriter, any event relating to or affecting the Company or the Guarantor, or of which the Company and the Guarantor shall be advised in writing by the Representatives, shall occur, which in the opinion of the Company, the Guarantor 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 and the Guarantor forthwith will (i) notify the Underwriters to suspend solicitation of purchases of the Securities 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 Securities after the expiration of the period specified in the preceding sentence, the Company or the Guarantor, upon the request of such Underwriter, will furnish to such

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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 and the Guarantor 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 and the Guarantor will endeavor, in cooperation with the Underwriters, to qualify the Securities for offering and sale under the applicable securities laws of such states and the other jurisdictions of the United States as the Representatives may designate; provided, however, that neither the Company nor the Guarantor shall 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 or the Guarantor 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 and the Guarantor will make generally available to their 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 Guarantor (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 Guarantor'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 and the Guarantor 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 and the Guarantor 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, neither the Company nor the Guarantor will, 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;If at any time when Securities remain unsold by the Underwriters, the Company or the Guarantor receives from the Commission a notice pursuant to Rule 401(g)(2) under the 1933 Act or otherwise cease to be eligible to use the automatic shelf registration statement form, the Company and the Guarantor will (i) promptly notify the Representatives, (ii) promptly file a new registration statement or post-effective amendment on the proper form relating to the Securities, in a form satisfactory to the Representatives, (iii) use their reasonable best efforts

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to cause such registration statement or post-effective amendment to be declared effective and (iv) promptly notify the Representatives of such effectiveness. The Company and the Guarantor will take all other reasonable action necessary or appropriate to permit the public offering and sale of the Securities to continue as contemplated in the registration statement that was the subject of the Rule 401(g)(2) notice or for which the Company or the Guarantor has otherwise become ineligible. References herein to the Registration Statement shall include such new registration statement or post-effective amendment, as the case may be.

SECTION 5.&nbsp;&nbsp;&nbsp;&nbsp;<u>PAYMENT OF EXPENSES</u>. The Company and the Guarantor will pay all expenses incidental to the performance of their 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 Securities, (iii) the fees and disbursements of the Company's and the Guarantor's counsel and accountants, (iv) the qualification of the Securities 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 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 Securities, (ix) any fees payable in connection with the rating of the Securities, (x) the cost and charges of any transfer agent or registrar and (xi) the cost of qualifying the Securities with The Depository Trust Company.

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 Securities, 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 Securities 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 the Guarantor or related to the offering shall be pending before, or to the knowledge of the Company or the Guarantor 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 and the Guarantor pursuant to Rule 433(d) under the 1933 Act, shall have been filed by the Company and the

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Guarantor 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;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;(1)&nbsp;&nbsp;&nbsp;&nbsp;The opinion, dated the Closing Date, of Balch & Bingham LLP, counsel for the Company, substantially in the form 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;(2)&nbsp;&nbsp;&nbsp;&nbsp;The opinion and related disclosure letter, each dated the Closing Date, of Troutman Pepper Locke LLP, counsel for the Company and the Guarantor, substantially in the forms attached hereto as Schedule IV.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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, dated the Closing Date, of Emmet, Marvin & Martin, LLP, counsel to the Trustee, substantially in the form 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)&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 VI.

&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;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;(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 Guarantor, 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 Guarantor, 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 Guarantor 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 Guarantor or related to the offering have been initiated or, to the knowledge of the Guarantor, threatened by the Commission.

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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;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 Guarantor within the meaning of the 1933 Act and the rules and regulations under the 1933 Act; (B) in their opinion, the financial statements of the Guarantor 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 Guarantor; (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 Guarantor, 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 Guarantor, 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 Guarantor 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 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 Company Gas 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 Guarantor 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 Guarantor or any decrease in net assets of the Guarantor 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

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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 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 Company Gas 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 Guarantor 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 Securities 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 and the Guarantor in connection with the issuance and sale of the Securities 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 reasonable judgment of the Representatives, shall materially impair the marketability of the Securities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h)&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Guarantor shall have performed their 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 and the Guarantor 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 AND THE GUARANTOR</u>. The obligations of the Company and the Guarantor shall be subject to the conditions set forth in the first sentence of Section 6(a) hereof. In case such conditions shall not have been fulfilled, this Agreement may be terminated by the Company or the Guarantor by mailing or delivering written notice thereof to the Representatives. Any such termination shall be

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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 and the Guarantor jointly and severally agree 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 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 or the Guarantor 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 any Preliminary Prospectus, the Registration Statement, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus, or the Final Supplemented Prospectus as so amended or supplemented, or in any free writing prospectus used by the Company or the Guarantor other than a Permitted 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 Registration Statement, Preliminary Prospectus, 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 or the Guarantor 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 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 and the Guarantor of any such action shall not release the Company or the Guarantor 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 and the Guarantor of the commencement thereof as above provided, the Company and the Guarantor 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 or the Guarantor 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 and the Guarantor 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

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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 and the Guarantor, its directors and such of its officers who have signed the Registration Statement and each person, if any, who controls the Company or the Guarantor 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 and the Guarantor set forth in Section 8(a) hereof, but only with respect to alleged untrue statements or omissions made in 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 or the Guarantor 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 and the Guarantor 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 or the Guarantor and shall survive delivery of the Securities to the Underwriters.

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 and the Guarantor, 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 Securities 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 or the

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Guarantor to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company or the Guarantor shall be unable to perform its obligations under this Agreement, then in any such case, the Company and the Guarantor 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 Securities and, upon such reimbursement, the Company and the Guarantor 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 Securities 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 Securities, 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 Securities, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

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, the Company or the Guarantor 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, MUFG Securities Americas Inc., 1221 Avenue of the Americas, 6th Floor, New York, New York 10020, Attention: Capital Markets Group, Fax No.: (646) 434-3455, Santander US Capital Markets LLC, 437 Madison Avenue, New York, New York 10022, Fax: 212-407-0930, Attention: Debt Capital Markets and U.S. Bancorp Investments, Inc., 214 North Tryon Street, 26th Floor, Charlotte, North Carolina 28202, Attention: Investment Grade Syndicate, Fax No.: (877) 774-3462; 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

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Southern Company Services, Inc., 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia 30308, Attention: J. Seth Blocker.

In accordance with the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)), the Underwriters are required to obtain, verify and record information that identifies their respective clients, including the Company and the Guarantor, which information may include the name and address of their respective clients, as well as other information that will allow the Underwriters to properly identify their respective clients.

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 the Guarantor 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 the Guarantor 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 the Guarantor 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 Securities from any of the Underwriters shall be deemed to be a successor by reason merely of such purchase. The Company and the Guarantor acknowledge and agree that in connection with all aspects of each transaction contemplated by this Agreement, the Company and the Guarantor 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 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

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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;(1)&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;(2)&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;(3)&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.

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

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Very truly yours,

SOUTHERN COMPANY GAS CAPITAL CORPORATION

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Brian T. Arnberger&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Brian T. Arnberger

Title: Assistant Treasurer

SOUTHERN COMPANY GAS

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Brian T. Arnberger&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Brian T. Arnberger

Title: Assistant Treasurer

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CONFIRMED AND ACCEPTED,<br>as of the date first above written

BMO CAPITAL MARKETS CORP.

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Mark Spadaccini&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Mark Spadaccini

Title: Managing Director

MUFG SECURITIES AMERICAS INC.

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Maheen Baig&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Maheen Baig

Title: Managing Director

SANTANDER US CAPITAL MARKETS LLC

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Richard Zobkiw&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Richard Zobkiw

Title: Executive Director

U.S. BANCORP INVESTMENTS, INC.

By:&nbsp;&nbsp;&nbsp;&nbsp;<u>/s/ Brent Kreissl&nbsp;&nbsp;&nbsp;&nbsp;</u>

Name: Brent Kreissl

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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| | |
|:---|:---|
| Name of Underwriters | Principal Amount of Securities |
| BMO Capital Markets Corp. | $72250000 |
| MUFG Securities Americas Inc. | 72250000 |
| Santander US Capital Markets LLC | 72250000 |
| U.S. Bancorp Investments, Inc. | 72250000 |
| BBVA Securities Inc. | 21250000 |
| BNY Mellon Capital Markets, LLC | 21250000 |
| CIBC World Markets Corp. | 21250000 |
| Huntington Securities, Inc. | 21250000 |
| Intesa Sanpaolo IMI Securities Corp. | 21250000 |
| TD Securities (USA) LLC | 21250000 |
| MFR Securities, Inc. | 4250000 |
| Siebert Williams Shank & Co., LLC | 4250000 |
| **TOTAL:** | $425000000 |

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Schedule I-1

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**SCHEDULE II**

**PRICING DISCLOSURE PACKAGE**

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| | |
|:---|:---|
| 1) | Prospectus dated February 21, 2025 |
| 2) | Preliminary Prospectus Supplement dated September 3, 2025 (which shall be deemed to 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 |

---

Schedule II-1

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Schedule III

[Letterhead of BALCH & BINGHAM LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025B 5.10% Senior Notes<br>due September 15, 2035

Ladies and Gentlemen:

We have acted as special Alabama counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), in connection with (i) the Company's issuance of $425,000,000 aggregate principal amount of its Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Notes") and the related guarantee thereof (the "Guarantee") by Southern Company Gas (the "Guarantor") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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(b)(1) of the Underwriting Agreement.

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

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;a)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor 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;b)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor 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;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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus supplement dated September 3, 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 Guarantor dated September 3, 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;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;f)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Guarantee;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g)&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;h)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus pertaining to the Notes prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i)&nbsp;&nbsp;&nbsp;&nbsp;The Company's Articles of Incorporation, as filed with the Nevada Secretary of State's Office on September 15, 2000, as amended by Certificate of Amendment filed with the Nevada Secretary of State's office on July 19, 2016 and as further amended by the Certificate of Incorporation filed with the Alabama Secretary of State's office on December 26, 2024 (as so amended, the "Certificate of Incorporation");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;j)&nbsp;&nbsp;&nbsp;&nbsp;A copy of the Bylaws of the Company as adopted December 31, 2024 (the "Bylaws");

Schedule III-2

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;k)&nbsp;&nbsp;&nbsp;&nbsp;A Certificate of Good Standing for the Company issued by the Alabama Secretary of State on September 3, 2025;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;l)&nbsp;&nbsp;&nbsp;&nbsp;Unanimous Written Consent of the Board of Directors of the Company dated February 19, 2025, authorizing and approving the Registration Statement, the issuance and sale of the securities described in the Registration Statement and matters related thereto;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m)&nbsp;&nbsp;&nbsp;&nbsp;Unanimous Written Consent of the Board of Directors of the Company dated February 19, 2025, authorizing the Notes;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;n)&nbsp;&nbsp;&nbsp;&nbsp;Certificate of Marcia R. DeMar, Corporate Secretary of the Company, dated as of September 8, 2025 (the "Officer's Certificate"); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o)&nbsp;&nbsp;&nbsp;&nbsp;Officers' Certificate Pursuant to Section 301 of the Indenture of Grace A. Kolvereid, Executive Vice President, Chief Financial Officer, Chief Risk Officer and Treasurer of the Company and Marcia R. DeMar, Corporate Secretary, dated September 8, 2025, establishing the Notes as a series of securities to be issued under the Indenture with the terms and characteristics as described therein.

The documents listed in Schedule II 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 certificate representing the Notes, of which we have examined a specimen), 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.

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 Alabama and has due corporate authority to own its properties and conduct its business as described in the Pricing Disclosure Package and the 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;2.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized by the Company, and relying solely on the Officer's Certificate, has been 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;The Notes have been duly authorized by the Company, have been executed by the Company and, when received by the Trustee, will be delivered by the Company.

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;4.&nbsp;&nbsp;&nbsp;&nbsp;The Underwriting Agreement has been duly authorized by the Company, has been executed by the Company and, when received by the Representatives, will be 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;5.&nbsp;&nbsp;&nbsp;&nbsp;No order, consent or other authorization or approval is required by any governmental authority of the State of Alabama for the issuance by the Company of the Notes, except with respect to applicable state securities or "blue sky" laws, as to which we express no opinion.

&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;The execution and delivery by the Company of the Underwriting Agreement, and the Notes do not, and if the Company were now to perform its obligations under the Underwriting Agreement, the Indenture and the Notes such performance would not, result in any: (i) violation of the Company's Certificate of Incorporation or Bylaws; (ii) violation of any existing State of Alabama statute, regulation, rule or law to which the Company is subject; or (iii) violation of any judicial or administrative decree, writ, judgment or order to which, to the knowledge of such counsel, the Company is subject.

The attorneys in this firm that are rendering this opinion are members of the State Bar of Alabama and we do not purport to express any opinion herein concerning any law other than the laws of the State of Alabama.

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 in giving its opinion pursuant to the Underwriting Agreement, insofar as such opinion relates to matters of Alabama law and Hunton Andrews Kurth LLP may rely on this opinion in giving its opinion pursuant to the Underwriting Agreement, insofar as such opinion relates to matters of Alabama law. This opinion 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,<br>

BALCH & BINGHAM LLP

Schedule III-4

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Schedule IV

[Letterhead of TROUTMAN PEPPER LOCKE LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025B 5.10% Senior Notes<br>due September 15, 2035

Ladies and Gentlemen:

We have acted as counsel to Southern Company Gas, a Georgia corporation (the "Guarantor"), and as special counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), in connection with: (i) the offer and sale by the Company of its Series 2025B 5.10% Senior Notes due September 15, 2035 in the aggregate principal amount of $425,000,000 (the "Notes") and the related guarantee thereof by the Guarantor (the "Guarantee", and together with the Notes, the "Securities") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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(b)(2) of the Underwriting Agreement.

Schedule IV-1

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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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor 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;b)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor 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;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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus supplement dated September 3, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company and the Guarantor 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 Guarantor dated September 3, 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;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;f)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Officer's Certificate pursuant to Section 301 of the Indenture;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g)&nbsp;&nbsp;&nbsp;&nbsp;A specimen of global note No. EE-1 representing the Notes (the "Global Note");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Guarantee;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i)&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;j)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus pertaining to the Notes prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 of the Act (the "Permitted Free Writing Prospectus");

Schedule IV-2

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;k)&nbsp;&nbsp;&nbsp;&nbsp;The Guarantor's charter and bylaws; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;l)&nbsp;&nbsp;&nbsp;&nbsp;Such other corporate and other documents, records and certificates as we considered necessary or appropriate, including certificates of public officials and officers of the Company and the Guarantor.

The documents listed in Schedule II 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 certificate representing the Notes, of which we have examined a specimen), 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, (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 and (v) the authority of the person or persons who executed any such documents on behalf of any person or entity (other than the Company and the Guarantor).

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 Guarantor is a corporation validly existing and in good standing under the law of the State of Georgia, and has the corporate authority to conduct its business as described in the Pricing Disclosure Package and the Final Supplemented Prospectus, to own and operate any properties used by it in such business and to enter into and perform its obligations under the Agreements and the Guarantee.

&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 Guarantor of the Underwriting Agreement have been duly authorized by all necessary corporate action on the part of the Guarantor, and the Underwriting Agreement has been duly executed and delivered by the Guarantor.

&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 Commission legally required for the issuance and sale of the Securities have been obtained; such orders are sufficient for the issuance and sale of the Securities in accordance with the terms of the Agreements; the issuance and sale of the Securities conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval pursuant to any Georgia or 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 Securities in accordance with the terms of the Underwriting Agreement.

Schedule IV-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;4.&nbsp;&nbsp;&nbsp;&nbsp;The Indenture has been duly authorized by all necessary corporate action on the part of the Guarantor, executed and delivered by the Guarantor and is enforceable against the Guarantor and the Company in accordance with its terms, subject to the qualifications that the enforceability of the Guarantor's and 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, when the Global Note is 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;The Guarantee has been duly authorized by all necessary corporate action on the part of the Guarantor, executed and delivered by the Guarantor and is enforceable against the Guarantor in accordance with its terms, subject to the qualifications that the enforceability of the Guarantor's obligations under the Guarantee 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;7.&nbsp;&nbsp;&nbsp;&nbsp;Each of the Indenture, the Guarantee 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;8.&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;9.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Guarantor of the Underwriting Agreement, the Indenture, and the Guarantee, and the consummation of the transactions contemplated thereby, do not result in any violation of: (i) the charter or bylaws of the Guarantor or (ii) any existing applicable law, rule or regulation of the United States or the State of Georgia.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Company of the Underwriting Agreement, the Indenture and the Global Note, and the consummation of the transactions contemplated thereby, do not result in any violation of any existing applicable law, rule or regulation of the United States or the State of Georgia.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Guarantor are not and, after giving effect to the offering and sale of the Securities, neither will be an "investment company" or a company "controlled" by an "investment company" within the meaning of the Investment Company Act of 1940, as amended.

Schedule IV-4

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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;12.&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, limitations and assumptions set forth therein.

The attorneys in this firm that are rendering this opinion are members of the State Bar of Georgia and we do not purport to express any opinion herein concerning any law other than the law of the State of Georgia, the federal law of the United States and, to the extent set forth herein, the law of the State of New York. As to all matters governed by or dependent upon the law 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. As to all matters governed by or dependent upon the law of the State of Alabama, we have, with your consent, relied upon the opinion of Balch & Bingham 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 Representatives of the 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 Hunton Andrews Kurth LLP may rely on this opinion in giving its opinion pursuant to the Underwriting Agreement, insofar as such opinion relates to matters of Georgia law. This opinion 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.

Sincerely,

Schedule IV-5

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[Letterhead of TROUTMAN PEPPER LOCKE LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025B 5.10% Senior Notes<br>due September 15, 2035

Ladies and Gentlemen:

We have acted as counsel to Southern Company Gas, a Georgia corporation (the "Guarantor"), and as special counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), in connection with: (i) the offer and sale by the Company of its Series 2025B 5.10% Senior Notes due September 15, 2035 in the aggregate principal amount of $425,000,000 (the "Notes") and the related guarantee thereof by the Guarantor (the "Guarantee") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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(b)(2) of the Underwriting Agreement.

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

Schedule IV-6

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In connection with the foregoing, we have examined the Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement"); the Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act; 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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents"); and the Company's and the Guarantor's prospectus supplement dated September 3, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company and the Guarantor 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 Guarantor dated September 3, 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 prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 under the Act (the "Permitted Free Writing Prospectus"). The documents listed in Schedule II to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

We have participated in various conferences with the Company and the Guarantor, their representatives, representatives of the independent public or certified public accountants of the Guarantor, representatives of you 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 7 and 12 of our opinion to you 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;1.&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;2.&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

Schedule IV-7

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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;3.&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, 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 3, 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 Representatives of the 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.

Sincerely,

Schedule IV-8

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Schedule V

[Letterhead of Emmet, Marvin & Martin, LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

as Representatives of the Several Underwriters

Southern Company Gas Capital Corporation

3535 Colonnade Parkway

Birmingham, Alabama 35243

Southern Company Gas

Ten Peachtree Place, N.E.

Atlanta, Georgia 30309

Southern Company Gas Capital Corporation<br>Southern Company Gas<br><u>Series 2025B 5.10% Senior Notes due September 15, 2035</u>

Ladies and Gentlemen:

We have acted as counsel to U.S. Bank Trust Company, National Association, in connection with the issuance by Southern Company Gas Capital Corporation (formerly known as AGL Capital Corporation) (the "Company") of $425,000,000 aggregate principal amount of Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Senior Notes") and the related guarantee thereof by Southern Company Gas (formerly known as AGL Resources Inc.) (the "Guarantor"), pursuant to the Indenture, dated as of February 1, 2025 (the "Indenture"), among the Company, the Guarantor and U.S. Bank Trust Company, National Association, as trustee (in such capacity, the "Trustee").

Schedule V-1

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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 the Trustee and of public officials. In such review, 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 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 the Trustee has been duly formed and that the Indenture constitutes a 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, the Trustee 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 constitutes a valid and binding agreement of the Trustee enforceable against the Trustee 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 based as 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 Senior 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.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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,

Schedule V-2

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Schedule VI

[Letterhead of HUNTON ANDREWS KURTH LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025B 5.10% Senior Notes<br>due September 15, 2035

To the Addressees:

We have acted as counsel to you in connection with (i) the issuance and sale by Southern Company Gas Capital Corporation (the "Company") of $425,000,000 aggregate principal amount of its Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Notes") and the related guarantee thereof (the "Guarantee" and, together with the Notes, the "Securities") by Southern Company Gas (the "Guarantor") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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(b)(4) of the Underwriting Agreement.

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

Schedule VI-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;a)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor 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;b)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor 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;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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's prospectus supplement dated September 3, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company and the Guarantor 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 Guarantor dated September 3, 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;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;f)&nbsp;&nbsp;&nbsp;&nbsp;An executed copy of the Guarantee;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g)&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;h)&nbsp;&nbsp;&nbsp;&nbsp;The free writing prospectus prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 under the Act (the "Permitted Free Writing Prospectus"); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i)&nbsp;&nbsp;&nbsp;&nbsp;The Company's and the Guarantor's charter and bylaws.

The documents listed in Schedule II 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 certificate representing the Notes, of which we have examined a specimen), and we have made such other and further investigations as we

Schedule VI-2

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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.

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 Guarantor is a corporation validly existing and in good standing under the law of the State of Georgia, and has the corporate authority to conduct its business as described in the Pricing Disclosure Package and the Final Supplemented Prospectus, to own and operate any properties used by it in such business and to enter into and perform its obligations under the Agreements and the Guarantee.

&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 and the Guarantor 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 and the Guarantor.

&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 Commission legally required for the issuance and sale of the Securities have been obtained; such orders are sufficient for the issuance and sale of the Securities in accordance with the terms of the Agreements; the issuance and sale of the Securities conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval of any New York or 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 Securities 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 the Guarantor and, assuming the due authorization, execution and delivery thereof by the Trustee, constitutes a valid and legally binding instrument of the Company and the Guarantor, enforceable against the Company and the Guarantor in accordance with its terms, subject to the qualifications that the enforceability of the Company's and the Guarantor'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

Schedule VI-3

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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;The Guarantee has been duly authorized by all necessary corporate action on the part of the Guarantor, executed and delivered by the Guarantor and is enforceable against the Guarantor in accordance with its terms, except as the enforcement thereof may be limited 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;7.&nbsp;&nbsp;&nbsp;&nbsp;Each of the Indenture, the Guarantee 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;8.&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;9.&nbsp;&nbsp;&nbsp;&nbsp;The execution and delivery by the Company and the Guarantor of the Underwriting Agreement, the Indenture, the Guarantee and the Notes, and the consummation of the transactions contemplated thereby, do not result in any violation of (i) the charter or bylaws of the Company or the Guarantor or (ii) any existing applicable law, rule or regulation of the United States or the State of New York.

We do not purport to express any opinion herein concerning any law other than the laws of the State of New York and the federal laws of the United States and, to the extent set forth herein, the laws of the State of Georgia and the State of Alabama. As to all matters governed by or dependent upon the laws of the State of Georgia, we have, with your consent, relied upon the opinion letter of Troutman Pepper Locke LLP dated the date hereof and addressed to you. As to all matters governed by or dependent upon the laws of the State of Alabama, we have, with your consent, relied upon the opinion of Balch & Bingham LLP dated the date hereof and addressed to you.

Schedule VI-4

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This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Representatives of the 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 Balch & Bingham LLP and Troutman Pepper Locke LLP may rely on this opinion letter in giving their opinions pursuant to Section 6 of the Underwriting Agreement and pursuant to 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,<br>HUNTON ANDREWS KURTH LLP

Schedule VI-1

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[Letterhead of HUNTON ANDREWS KURTH LLP]

September 8, 2025

BMO Capital Markets Corp.

151 West 42nd Street

New York, New York 10036

MUFG Securities Americas Inc.

1221 Avenue of the Americas, 6th Floor

New York, New York 10020

Santander US Capital Markets LLC

437 Madison Avenue

New York, New York 10022

U.S. Bancorp Investments, Inc.

214 North Tryon Street, 26th Floor

Charlotte, North Carolina 28202

As Representatives of the Several Underwriters

SOUTHERN COMPANY GAS CAPITAL CORPORATION<br>SOUTHERN COMPANY GAS<br>Series 2025B 5.10% Senior Notes<br>due September 15, 2035

To the Addressees:

We have acted as counsel to you in connection with (i) the issuance and sale by Southern Company Gas Capital Corporation (the "Company") of $425,000,000 aggregate principal amount of its Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Notes") and the related guarantee thereof (the "Guarantee" and, together with the Notes, the "Securities") by Southern Company Gas (the "Guarantor") pursuant to an Indenture (the "Indenture") dated as of February 1, 2025, by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"); and (ii) the purchase by the Underwriters (as hereinafter defined) of the Notes pursuant to the terms of an Underwriting Agreement dated September 3, 2025 (the "Underwriting Agreement"), among the Company, the Guarantor 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 in your capacity as Representatives pursuant to Section 6(b)(4) of the Underwriting Agreement.

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

Schedule VI-2

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In connection with the foregoing, we have examined the Company's and the Guarantor's registration statement on Form S-3 (File Nos. 333-285115 and 333-285115-01) pertaining to the Notes, the Guarantee and certain other securities filed by the Company and the Guarantor under the Securities Act of 1933, as amended (the "Act"), as it became effective under the Act (the "Registration Statement"); the Company's and the Guarantor's prospectus dated February 21, 2025 (the "Base Prospectus"), as supplemented by a preliminary prospectus supplement dated September 3, 2025 (together with the Pricing Exchange Act Documents (as hereinafter defined), the "Pricing Prospectus"), filed by the Company and the Guarantor pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the "Commission") under the Act; 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 Guarantor for the fiscal year ended December 31, 2024, the Quarterly Reports on Form 10-Q of the Guarantor for the quarters ended March 31, 2025 and June 30, 2025 and the Current Report on Form 8-K of the Guarantor dated January 3, 2025 (together, the "Pricing Exchange Act Documents"); and the Company's and the Guarantor's prospectus supplement dated September 3, 2025 (together with the Base Prospectus, the "Final Supplemented Prospectus"), filed by the Company and the Guarantor 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 Guarantor dated September 3, 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 prepared by the Company and the Guarantor and filed with the Commission on September 3, 2025 pursuant to Rule 433 under the Act (the "Permitted Free Writing Prospectus"). The documents listed in Schedule II to the Underwriting Agreement, taken together, are collectively referred to as the "Pricing Disclosure Package."

We have participated in various conferences with the Company and the Guarantor, their counsel, their representatives and representatives of the independent public or certified public accountants of the Guarantor 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 7 of our opinion letter to you 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

Schedule VI-3

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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, 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 3, 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 Representatives of the 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 VI-4

## Exhibit 4.1

Exhibit 4.1(a)

This Security is a global security within the meaning of the Indenture hereinafter referred to and is registered in the name of a depositary (as specified pursuant to the Indenture) or a nominee thereof. This global security is exchangeable for securities registered in the name of a person other than the depositary or its nominee only in the limited circumstances described in, or pursuant to, the Indenture and, unless and until it is exchanged in whole or in part for securities in definitive form, this global security may not be transferred except as a whole 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 by the depositary or any such nominee to a successor depositary or a nominee of such successor depositary.

Unless this security is presented by an authorized representative of the Depository Trust Company, a New York corporation ("DTC"), to Southern Company Gas Capital Corporation (the "Company") or its agent for registration of transfer, exchange or payment, and any security issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), any transfer, pledge or other use hereof for value or otherwise by or to any person is wrongful inasmuch as the registered owner hereof, Cede & Co., has an interest herein.

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**SOUTHERN COMPANY GAS CAPITAL CORPORATION**

**Series 2025A 4.05% Senior Notes due September 15, 2028**

**Guaranteed by**

**Southern Company Gas**

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|:---|:---|
| No. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Principal Amount: |
| CUSIP No. 8426EP AJ7 | Maturity Date: September 15, 2028 |

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Southern Company Gas Capital Corporation, a corporation organized and existing under the laws of the State of Alabama (herein called the "Company," which term includes any successor corporation under the Indenture referred to hereinafter), for value received, hereby promises to pay to Cede & Co., as the nominee of The Depository Trust Company, or registered assigns, the principal sum of ____________________ Dollars and to pay interest thereon from September 8, 2025 semiannually on each Interest Payment Date of March 15 and September 15 of each year, commencing on March 15, 2026 at 4.05% per annum, until the principal hereof is paid or provided for. Interest so payable shall be computed on the basis of a 360-day year consisting of twelve 30-day months. The interest so payable, and paid or duly provided for, on any Interest Payment Date shall, as provided in the Indenture (as defined below), be paid to the Person in whose name this Security is registered at the close of business on the Regular Record Date for such interest, which shall be (i) the Business Day (as defined below) immediately preceding such Interest Payment Date if any Securities of this series 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 Securities of this series are issuable in the form of one or more Global Securities (whether or not a Business Day). 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. Except as otherwise provided in the Indenture, any such interest not so paid or duly provided for shall 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 Security 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 Securities 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 inconsistent with the requirements of any securities exchange on which the Securities for this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture.

Payment of the principal of and premium, if any, on this Security at Stated Maturity shall be paid by wire transfer in immediately available funds (except that payment on certificated notes shall be paid by check except in certain circumstances) upon presentation hereof at the offices of U.S. Bank Trust Company, National Association or at such other office or agency as may be designated for such purpose by the Company from time to time. Payment of interest on this Security shall be made by wire transfer in immediately available funds (except that payment on certificated notes shall be paid by check except in certain circumstances) to the Person entitled thereto as indicated in the Security Register. Payment of the principal of and premium, if any, and interest on this Security, as aforesaid, shall be made in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of

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public and private debts.

This Security is one of a duly authorized issue of securities of the Company (herein called the "Securities"), issued and issuable in one or more series under an Indenture, dated as of February 1, 2025 (such Indenture as originally executed and delivered, together with any constituent instruments establishing the terms of particular Securities, being herein called the "Indenture"), by and among the Company, Southern Company Gas and U.S. Bank Trust Company, National Association (herein called the "Trustee," which term includes any successor trustee under the Indenture), to which Indenture, all indentures supplemental thereto or Officer's Certificates pursuant to Section 301 of such Indenture reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. The acceptance of this Security shall be deemed to constitute the consent and agreement by the Holder hereof to all of the terms and provisions of the Indenture.

If any Interest Payment Date or the Stated Maturity shall not be a Business Day, payment of the amounts due on this Security on such date may be made on the next succeeding Business Day, as if each such payment were made on the date such payment were due and no interest shall accrue on such amounts for the period from and after such Interest Payment Date, or Stated Maturity, as the case may be, to such Business Day.

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

The Indenture permits, with certain exceptions as therein provided, the Trustee to enter into one or more supplemental indentures for the purpose of adding any provisions to, or changing in any manner or eliminating any of the provisions of, the Indenture with the consent of the Holders of not less than a majority in aggregate principal amount of the Securities of all series then Outstanding under the Indenture, considered as one class; provided, however, that if there shall be Securities of more than one series Outstanding under the Indenture and if a proposed supplemental indenture shall directly affect the rights of the Holders of Securities of one or more, but less than all, of such series, then the consent only of the Holders of a majority in aggregate principal amount of the Outstanding Securities of all series so directly affected, considered as one class, shall be required; and provided, further, that if the Securities of any series shall have been issued in more than one Tranche and if the proposed supplemental indenture shall directly affect the rights of the Holders of Securities of one or more, but less than all, of such Tranches, then the consent only of the Holders of a majority in aggregate principal amount of the Outstanding Securities of all Tranches so directly affected, considered as one class, shall be required. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities then Outstanding, on behalf of the Holders of all Securities, 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 Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange therefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security.

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

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As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of this Security for registration of transfer at the offices of the Trustee or such other office or agency as may be designated by the Company from time to time, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series of authorized denominations and of like tenor and aggregate principal amount, will be issued to the designated transferee or transferees.

Prior to August 15, 2028 (the "Par Call Date"), the Company may redeem the Securities at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of (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 Securities 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 10 basis points less (b) interest accrued to the redemption date, and (2) 100% of the principal amount of the Securities 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 Securities, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Securities being redeemed plus accrued and unpaid interest thereon to the redemption date.

The Company shall give notice to DTC of any redemption it proposes to make at least 10 days, but not more than 60 days, before the redemption date. If the Company redeems only some of the Securities, it is the practice of DTC to determine by lot the amount of the Securities to be redeemed of each of its participating institutions. Notice by DTC to these participants and by participants to "street name" holders of indirect interests in the Securities shall be made according to arrangements among them and may be subject to statutory or regulatory requirements.

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

The Securities of this series are issuable only as registered Securities, without coupons, in denominations of $2,000, and any amount in excess thereof that is an integral multiple of $1,000. As provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series, of any authorized denominations, as requested by the Holder surrendering the same, and of like tenor upon surrender of the Security or Securities to be exchanged at the offices of the Trustee or such other office or agency as may be designated by the Company from time to time.

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 Security 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 Security is registered as the absolute owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

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Capitalized terms used herein have the same meanings given in the Indenture unless otherwise indicated.

"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 Indenture and the Securities shall be governed by and construed in accordance with the laws of the State of New York.

As provided in the Indenture, no recourse shall be had for the payment of the principal of or premium, if any, or interest on any Securities, or any part thereof, or for any claim based thereon or

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otherwise in respect thereof, or of the indebtedness represented thereby, or upon any obligation, covenant or agreement under the Indenture, against, and no personal liability whatsoever shall attach to, or be incurred by, any incorporator, stockholder, officer or director, as such, past, present or future of the Company or of any predecessor or successor corporation (either directly or through the Company or a predecessor or successor corporation), whether by virtue of any constitutional provision, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise; it being expressly agreed and understood that the Indenture and all the Securities are solely corporate obligations and that any such personal liability is hereby expressly waived and released as a condition of and as part of the consideration for, the execution of the Indenture and the issuance of the Securities.

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

This Security is unsecured and is unconditionally guaranteed by Southern Company Gas.

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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 COMPANY GAS CAPITAL CORPORATION |
| | By: |
| | Name: |
| | Title: |
| Attest: |  |
| By: |  |
| Name: |  |
| Title: |  |

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This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated:

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

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FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers unto

[please insert social security or other identifying number of assignee]

[please print or typewrite name and address of assignee]

the within Security of SOUTHERN COMPANY GAS CAPITAL CORPORATION and does hereby irrevocably constitute and appoint _________________________________________________________ Attorney, to transfer said Security on the books of the within-mentioned Company, with full power of substitution in the premises.

Dated:&nbsp;&nbsp;&nbsp;&nbsp;________________________________

_________________________________________________

Notice: The signature to this

assignment must correspond with the name as written upon the face of the Security in every particular without alteration or enlargement or any change whatsoever.

## Exhibit 4.1

Exhibit 4.1(b)

This Security is a global security within the meaning of the Indenture hereinafter referred to and is registered in the name of a depositary (as specified pursuant to the Indenture) or a nominee thereof. This global security is exchangeable for securities registered in the name of a person other than the depositary or its nominee only in the limited circumstances described in, or pursuant to, the Indenture and, unless and until it is exchanged in whole or in part for securities in definitive form, this global security may not be transferred except as a whole 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 by the depositary or any such nominee to a successor depositary or a nominee of such successor depositary.

Unless this security is presented by an authorized representative of the Depository Trust Company, a New York corporation ("DTC"), to Southern Company Gas Capital Corporation (the "Company") or its agent for registration of transfer, exchange or payment, and any security issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), any transfer, pledge or other use hereof for value or otherwise by or to any person is wrongful inasmuch as the registered owner hereof, Cede & Co., has an interest herein.

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**SOUTHERN COMPANY GAS CAPITAL CORPORATION**

**Series 2025B 5.10% Senior Notes due September 15, 2035**

**Guaranteed by**

**Southern Company Gas**

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| | |
|:---|:---|
| No. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Principal Amount: |
| CUSIP No. 8426EP AK4 | Maturity Date: September 15, 2035 |

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Southern Company Gas Capital Corporation, a corporation organized and existing under the laws of the State of Alabama (herein called the "Company," which term includes any successor corporation under the Indenture referred to hereinafter), for value received, hereby promises to pay to Cede & Co., as the nominee of The Depository Trust Company, or registered assigns, the principal sum of ____________________ Dollars and to pay interest thereon from September 8, 2025 semiannually on each Interest Payment Date of March 15 and September 15 of each year, commencing on March 15, 2026 at 5.10% per annum, until the principal hereof is paid or provided for. Interest so payable shall be computed on the basis of a 360-day year consisting of twelve 30-day months. The interest so payable, and paid or duly provided for, on any Interest Payment Date shall, as provided in the Indenture (as defined below), be paid to the Person in whose name this Security is registered at the close of business on the Regular Record Date for such interest, which shall be (i) the Business Day (as defined below) immediately preceding such Interest Payment Date if any Securities of this series 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 Securities of this series are issuable in the form of one or more Global Securities (whether or not a Business Day). 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. Except as otherwise provided in the Indenture, any such interest not so paid or duly provided for shall 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 Security 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 Securities 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 inconsistent with the requirements of any securities exchange on which the Securities for this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture.

Payment of the principal of and premium, if any, on this Security at Stated Maturity shall be paid by wire transfer in immediately available funds (except that payment on certificated notes shall be paid by check except in certain circumstances) upon presentation hereof at the offices of U.S. Bank Trust Company, National Association or at such other office or agency as may be designated for such purpose by the Company from time to time. Payment of interest on this Security shall be made by wire transfer in immediately available funds (except that payment on certificated notes shall be paid by check except in certain circumstances) to the Person entitled thereto as indicated in the Security Register. Payment of the principal of and premium, if any, and interest on this Security, as aforesaid, shall be made in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of

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public and private debts.

This Security is one of a duly authorized issue of securities of the Company (herein called the "Securities"), issued and issuable in one or more series under an Indenture, dated as of February 1, 2025 (such Indenture as originally executed and delivered, together with any constituent instruments establishing the terms of particular Securities, being herein called the "Indenture"), by and among the Company, Southern Company Gas and U.S. Bank Trust Company, National Association (herein called the "Trustee," which term includes any successor trustee under the Indenture), to which Indenture, all indentures supplemental thereto or Officer's Certificates pursuant to Section 301 of such Indenture reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. The acceptance of this Security shall be deemed to constitute the consent and agreement by the Holder hereof to all of the terms and provisions of the Indenture.

If any Interest Payment Date or the Stated Maturity shall not be a Business Day, payment of the amounts due on this Security on such date may be made on the next succeeding Business Day, as if each such payment were made on the date such payment were due and no interest shall accrue on such amounts for the period from and after such Interest Payment Date, or Stated Maturity, as the case may be, to such Business Day.

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

The Indenture permits, with certain exceptions as therein provided, the Trustee to enter into one or more supplemental indentures for the purpose of adding any provisions to, or changing in any manner or eliminating any of the provisions of, the Indenture with the consent of the Holders of not less than a majority in aggregate principal amount of the Securities of all series then Outstanding under the Indenture, considered as one class; provided, however, that if there shall be Securities of more than one series Outstanding under the Indenture and if a proposed supplemental indenture shall directly affect the rights of the Holders of Securities of one or more, but less than all, of such series, then the consent only of the Holders of a majority in aggregate principal amount of the Outstanding Securities of all series so directly affected, considered as one class, shall be required; and provided, further, that if the Securities of any series shall have been issued in more than one Tranche and if the proposed supplemental indenture shall directly affect the rights of the Holders of Securities of one or more, but less than all, of such Tranches, then the consent only of the Holders of a majority in aggregate principal amount of the Outstanding Securities of all Tranches so directly affected, considered as one class, shall be required. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities then Outstanding, on behalf of the Holders of all Securities, 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 Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange therefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security.

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

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As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of this Security for registration of transfer at the offices of the Trustee or such other office or agency as may be designated by the Company from time to time, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series of authorized denominations and of like tenor and aggregate principal amount, will be issued to the designated transferee or transferees.

Prior to March 15, 2035 (the "Par Call Date"), the Company may redeem the Securities at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of (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 Securities 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 Securities 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 Securities, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Securities being redeemed plus accrued and unpaid interest thereon to the redemption date.

The Company shall give notice to DTC of any redemption it proposes to make at least 10 days, but not more than 60 days, before the redemption date. If the Company redeems only some of the Securities, it is the practice of DTC to determine by lot the amount of the Securities to be redeemed of each of its participating institutions. Notice by DTC to these participants and by participants to "street name" holders of indirect interests in the Securities shall be made according to arrangements among them and may be subject to statutory or regulatory requirements.

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

The Securities of this series are issuable only as registered Securities, without coupons, in denominations of $2,000, and any amount in excess thereof that is an integral multiple of $1,000. As provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series, of any authorized denominations, as requested by the Holder surrendering the same, and of like tenor upon surrender of the Security or Securities to be exchanged at the offices of the Trustee or such other office or agency as may be designated by the Company from time to time.

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 Security 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 Security is registered as the absolute owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

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Capitalized terms used herein have the same meanings given in the Indenture unless otherwise indicated.

"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 Indenture and the Securities shall be governed by and construed in accordance with the laws of the State of New York.

As provided in the Indenture, no recourse shall be had for the payment of the principal of or premium, if any, or interest on any Securities, or any part thereof, or for any claim based thereon or

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otherwise in respect thereof, or of the indebtedness represented thereby, or upon any obligation, covenant or agreement under the Indenture, against, and no personal liability whatsoever shall attach to, or be incurred by, any incorporator, stockholder, officer or director, as such, past, present or future of the Company or of any predecessor or successor corporation (either directly or through the Company or a predecessor or successor corporation), whether by virtue of any constitutional provision, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise; it being expressly agreed and understood that the Indenture and all the Securities are solely corporate obligations and that any such personal liability is hereby expressly waived and released as a condition of and as part of the consideration for, the execution of the Indenture and the issuance of the Securities.

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

This Security is unsecured and is unconditionally guaranteed by Southern Company Gas.

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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 COMPANY GAS CAPITAL CORPORATION |
| | By: |
| | Name: |
| | Title: |
| Attest: |  |
| By: |  |
| Name: |  |
| Title: |  |

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This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated:

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

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FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers unto

[please insert social security or other identifying number of assignee]

[please print or typewrite name and address of assignee]

the within Security of SOUTHERN COMPANY GAS CAPITAL CORPORATION and does hereby irrevocably constitute and appoint _________________________________________________________ Attorney, to transfer said Security on the books of the within-mentioned Company, with full power of substitution in the premises.

Dated:&nbsp;&nbsp;&nbsp;&nbsp;________________________________

_________________________________________________

Notice: The signature to this

assignment must correspond with the name as written upon the face of the Security in every particular without alteration or enlargement or any change whatsoever.

## Exhibit 4.3

Exhibit 4.3(a)

**GUARANTEE**

This **GUARANTEE** of Southern Company Gas, a Georgia corporation (the "Guarantor"), is dated as of ___________, 20___.

The Guarantor, for value received, hereby unconditionally guarantees to each Holder of a Series 2025A 4.05% Senior Note due September 15, 2028 (a "Note") of Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), authenticated and delivered by the Trustee pursuant to the terms of an Indenture by and among the Company, the Trustee and the Guarantor dated as of February 1, 2025 (such Indenture as originally executed and delivered, together with any constituent instruments establishing the terms of particular Securities, being herein called the "Indenture"), and to the Trustee on behalf of each such Holder, the due and punctual payment of the principal of (and premium, if any) and interest, on each such Note, each as provided for pursuant to the terms of such Note when and as the same shall become due and payable, in accordance with the terms of such Note and of the Indenture under which it was issued. In case of the failure of the Company to make any such payment of principal (or premium, if any) or interest, the Guarantor hereby agrees to cause any such payment to be made when and as the same shall become due and payable by acceleration, call for redemption or otherwise, as if such payment were made by the Company.

The Guarantor hereby agrees that its obligations hereunder shall be unconditional, irrespective of the validity, regularity or enforceability of such Note or the Indenture, the absence of any action to enforce the same, any waiver or consent by the Holder of such Note or by the Trustee with respect to any provisions thereof or of the Indenture, the obtaining of any judgment against the Company or any action to enforce the same or any other circumstances which might otherwise constitute a legal or equitable discharge or defense of a guarantor. The Guarantor hereby waives the benefits of division and discussion, diligence, presentment, demand of payment, filing of claims with a court in the event of insolvency or bankruptcy of the Company, any right to require a proceeding first against the Company, protest or notice with respect to such Note or the indebtedness evidenced thereby and all demands whatsoever, and covenants that this Guarantee will not be discharged except by complete performance of the obligations contained in the Note and in this Guarantee. This Guarantee is a guarantee of payment and not of collection. If the Trustee or the Holder of any Note is required by any court or otherwise to return to the Company or the Guarantor, or any custodian, receiver, liquidator, trustee, sequestrator or other similar official acting in relation to the Company or the Guarantor, any amount paid to the Trustee or such Holder in respect of a Note, this Guarantee, to the extent theretofore discharged, shall be reinstated in full force and effect.

The Guarantor shall be subrogated to all rights of the Holders of a Note in respect of any amounts paid by the Guarantor on account of such Note pursuant to the provisions of this Guarantee or the Indenture; provided, however, that the Guarantor shall not be entitled to enforce or to receive any payments arising out of, or based upon, such right of subrogation until the principal of (and premium, if any) and interest, on the Note shall have been paid in full.

Capitalized terms used herein have the same meanings given in the Indenture unless otherwise indicated. This Guarantee shall be governed by and construed in accordance with the law of the State of New York.

------

This Guarantee is executed as of the day and year first above written.

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| |
|:---|
| SOUTHERN COMPANY GAS |
| By: |
| Name:<br>Title: |

---

------

---

| |
|:---|
| Attest: |
| By: |
| Name:<br>Title: |

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## Exhibit 4.3

Exhibit 4.3(b)

**GUARANTEE**

This **GUARANTEE** of Southern Company Gas, a Georgia corporation (the "Guarantor"), is dated as of ___________, 20___.

The Guarantor, for value received, hereby unconditionally guarantees to each Holder of a Series 2025B 5.10% Senior Note due September 15, 2035 (a "Note") of Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), authenticated and delivered by the Trustee pursuant to the terms of an Indenture by and among the Company, the Trustee and the Guarantor dated as of February 1, 2025 (such Indenture as originally executed and delivered, together with any constituent instruments establishing the terms of particular Securities, being herein called the "Indenture"), and to the Trustee on behalf of each such Holder, the due and punctual payment of the principal of (and premium, if any) and interest, on each such Note, each as provided for pursuant to the terms of such Note when and as the same shall become due and payable, in accordance with the terms of such Note and of the Indenture under which it was issued. In case of the failure of the Company to make any such payment of principal (or premium, if any) or interest, the Guarantor hereby agrees to cause any such payment to be made when and as the same shall become due and payable by acceleration, call for redemption or otherwise, as if such payment were made by the Company.

The Guarantor hereby agrees that its obligations hereunder shall be unconditional, irrespective of the validity, regularity or enforceability of such Note or the Indenture, the absence of any action to enforce the same, any waiver or consent by the Holder of such Note or by the Trustee with respect to any provisions thereof or of the Indenture, the obtaining of any judgment against the Company or any action to enforce the same or any other circumstances which might otherwise constitute a legal or equitable discharge or defense of a guarantor. The Guarantor hereby waives the benefits of division and discussion, diligence, presentment, demand of payment, filing of claims with a court in the event of insolvency or bankruptcy of the Company, any right to require a proceeding first against the Company, protest or notice with respect to such Note or the indebtedness evidenced thereby and all demands whatsoever, and covenants that this Guarantee will not be discharged except by complete performance of the obligations contained in the Note and in this Guarantee. This Guarantee is a guarantee of payment and not of collection. If the Trustee or the Holder of any Note is required by any court or otherwise to return to the Company or the Guarantor, or any custodian, receiver, liquidator, trustee, sequestrator or other similar official acting in relation to the Company or the Guarantor, any amount paid to the Trustee or such Holder in respect of a Note, this Guarantee, to the extent theretofore discharged, shall be reinstated in full force and effect.

The Guarantor shall be subrogated to all rights of the Holders of a Note in respect of any amounts paid by the Guarantor on account of such Note pursuant to the provisions of this Guarantee or the Indenture; provided, however, that the Guarantor shall not be entitled to enforce or to receive any payments arising out of, or based upon, such right of subrogation until the principal of (and premium, if any) and interest, on the Note shall have been paid in full.

Capitalized terms used herein have the same meanings given in the Indenture unless otherwise indicated. This Guarantee shall be governed by and construed in accordance with the law of the State of New York.

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This Guarantee is executed as of the day and year first above written.

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| |
|:---|
| SOUTHERN COMPANY GAS |
| By: |
| Name:<br>Title: |

---

------

---

| |
|:---|
| Attest: |
| By: |
| Name:<br>Title: |

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## Exhibit 5.1

Exhibit 5.1(a)

[Letterhead of Troutman Pepper Locke LLP]

September 8, 2025

Southern Company Gas

Ten Peachtree Place, N.E.

Atlanta, Georgia 30309

Southern Company Gas Capital Corporation

3535 Colonnade Parkway

Birmingham, Alabama 35243

Re:&nbsp;&nbsp;&nbsp;&nbsp;Southern Company Gas

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

Ladies and Gentlemen:

We have acted as counsel to Southern Company Gas, a Georgia corporation (the "<u>Guarantor</u>"), and as special counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "<u>Company</u>"), in connection with the offer and sale by the Company of its Series 2025A 4.05% Senior Notes due September 15, 2028 in the aggregate principal amount of $425,000,000 (the "<u>Notes</u>") and the related guarantee thereof by the Guarantor (the "<u>Guarantee</u>"). The Notes will be issued pursuant to an indenture dated as of February 1, 2025 (the "<u>Indenture</u>"), among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "<u>Trustee</u>"). The offer and sale of the Notes and the Guarantee have been registered pursuant to a Registration Statement on Form S-3 (Registration Nos. 333-285115 and 333-285115-01) filed by the Company and the Guarantor (the "<u>Registration Statement</u>"). The Company and the Guarantor have entered into an Underwriting Agreement dated September 3, 2025, by and among the Company, the Guarantor, and BMO Capital Markets Corp., MUFG Securities Americas Inc., Santander US Capital Markets LLC and U.S. Bancorp Investments, Inc., for themselves and as Representatives of the other Underwriters listed on Schedule I thereto (the "<u>Underwriting Agreement</u>"), relating to the sale of the Notes and the Guarantee. Capitalized terms not defined herein shall have such meanings as are set forth in the Underwriting Agreement.

In our capacity as counsel to the Guarantor and the Company, we have examined the Registration Statement. We also have examined originals, or duplicates or conformed copies, of such documents, corporate records, agreements and other instruments, and have made such other investigations, as we have deemed relevant and necessary for purposes of the opinions hereinafter set forth. As to questions of fact material to this opinion letter, we have relied upon certificates or comparable documents of public officials and upon oral or written statements and representations of officers and representatives of the Guarantor and the Company.

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Southern Company Gas

Southern Company Gas Capital Corporation

September 8, 2025

During the course of such examination and review, and in connection with furnishing the opinions set forth below, we have assumed the accuracy and completeness of all documents and records that we have reviewed, the genuineness of all signatures, the legal capacity of all natural persons, the authenticity of the documents submitted to us as originals and the conformity to authentic original documents of all documents submitted to us as certified, conformed or reproduced copies. We are familiar with the proceedings taken and proposed to be taken by the Guarantor and the Company in connection with the authorization and issuance of the Notes and the Guarantee, and, for the purposes of this opinion letter, we have assumed that any future, similar or other required proceedings will be timely completed in the manner presently contemplated.

To the extent that the obligations of the Guarantor and the Company under the Notes may be dependent upon such matters, we assume for purposes of this opinion letter that (i) the Trustee is and has been duly organized, validly existing and in good standing under the laws of its jurisdiction of organization and is duly qualified to engage in the activities contemplated by the Indenture; (ii) the Indenture has been duly authorized, executed and delivered by, and constitutes the legal, valid and binding obligation of, the Trustee, enforceable against the Trustee in accordance with its terms; (iii) the Trustee is in compliance, generally and with respect to acting as a trustee under the Indenture, with all applicable laws and regulations; (iv) the Trustee had and has the requisite organizational and legal power and authority to perform its obligations under the Indenture; and (v) the global note No. DD-1 representing the Notes (the "<u>Global Note</u>") will be duly authenticated by the Trustee in the manner provided in the Indenture.

Based upon the foregoing, and subject to the limitations, qualifications, exceptions and assumptions set forth herein, we are of the opinion that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.The Notes have been authorized by all necessary corporate action on the part of the Company and, when the Global Note is executed by the Company and authenticated by the Trustee in accordance with the provisions of the Indenture and delivered and paid for as provided in the Underwriting Agreement, will be legal, valid and binding obligations of the Company, enforceable against the Company in accordance with their terms.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.The Guarantee has been authorized by all necessary corporate action on the part of the Guarantor and, when the Guarantee is executed by the Guarantor and delivered in the manner contemplated by the Underwriting Agreement and the Indenture, and when the Global Note is executed by the Company and authenticated by the Trustee in accordance with the provisions of the Indenture and delivered and paid for as provided in the Underwriting Agreement, the Guarantee will be the legal, valid and binding obligation of the Guarantor, enforceable against the Guarantor in accordance with its terms.

The opinions provided above are subject to the following exceptions, limitations and qualifications: (i) the effect of bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally; and (ii) general principles of equity, whether considered in a proceeding at law or in equity.

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Southern Company Gas

Southern Company Gas Capital Corporation

September 8, 2025

Our examination of matters of law in connection with the opinions expressed herein has been limited to, and accordingly our opinions expressed herein are limited to, the federal law of the United States of America, the laws of the State of Georgia and, to the extent set forth herein, the law of the State of New York. We express no opinion with respect to the laws of any other jurisdiction. For purposes of the opinions provided above, we have relied upon (i) the opinion of Balch & Bingham LLP, counsel for the Company, with respect to matters governed by the laws of the State of Alabama, a copy of which opinion has been filed as Exhibit 5.2(a) to the Guarantor's Current Report on Form 8-K, dated September 3, 2025, which is incorporated by reference in the Registration Statement, and (ii) the opinion of Hunton Andrews Kurth LLP, counsel to the Underwriters, with respect to matters governed by the laws of the State of New York, a copy of which is attached hereto as Annex I.

This opinion is given as of the date hereof, and we assume no obligation to advise you after the date hereof of facts or circumstances that come to our attention or changes in law that occur that could affect the opinions contained herein.

This opinion letter is being furnished in connection with the offer and sale of the Notes and the Guarantee pursuant to the registration requirements of the Securities Act of 1933, as amended (the "<u>Securities Act</u>"). We hereby consent to your filing this opinion as an exhibit to the Guarantor's Current Report on Form 8-K, dated September 3, 2025, which is incorporated by reference in the Registration Statement, and to the reference to our firm contained under the caption "Legal Matters" in the prospectus included therein. In giving this consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Securities and Exchange Commission promulgated 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; Sincerely,

/s/ Troutman Pepper Locke LLP

------

Southern Company Gas

Southern Company Gas Capital Corporation

September 8, 2025

**Annex I**

**Opinion of Hunton Andrews Kurth LLP**

Attached.

------

Annex I

[Letterhead of Hunton Andrews Kurth LLP]

September 8, 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 Nos. 333-285115 and 333-285115-01) (the "Registration Statement") relating to $425,000,000 aggregate principal amount of Southern Company Gas Capital Corporation's (the "Company") Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Notes") and the related guarantee thereof (the "Guarantee") by Southern Company Gas (the "Guarantor"). The Notes will be issued pursuant to an indenture dated as of February 1, 2025 (the "Indenture"), by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee").

We have examined the Registration Statement and the Indenture, which has been filed with the Securities and Exchange 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 by general principles of equity, whether considered in a proceeding at law or in equity.

------

Troutman Pepper Locke LLP

September 8, 2025

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion that the Guarantee is a valid, binding and legal obligation of the Guarantor, 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.

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. 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 Securities and Exchange Commission thereunder. This opinion letter may not be relied upon, furnished or quoted by you for any other purpose, without our prior written consent.

Very truly yours,

/s/ Hunton Andrews Kurth LLP

## Exhibit 5.1

Exhibit 5.1(b)

[Letterhead of Troutman Pepper Locke LLP]

September 8, 2025

Southern Company Gas

Ten Peachtree Place, N.E.

Atlanta, Georgia 30309

Southern Company Gas Capital Corporation

3535 Colonnade Parkway

Birmingham, Alabama 35243

Re:&nbsp;&nbsp;&nbsp;&nbsp;Southern Company Gas

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

Ladies and Gentlemen:

We have acted as counsel to Southern Company Gas, a Georgia corporation (the "<u>Guarantor</u>"), and as special counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "<u>Company</u>"), in connection with the offer and sale by the Company of its Series 2025B 5.10% Senior Notes due September 15, 2035 in the aggregate principal amount of $425,000,000 (the "<u>Notes</u>") and the related guarantee thereof by the Guarantor (the "<u>Guarantee</u>"). The Notes will be issued pursuant to an indenture dated as of February 1, 2025 (the "<u>Indenture</u>"), among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "<u>Trustee</u>"). The offer and sale of the Notes and the Guarantee have been registered pursuant to a Registration Statement on Form S-3 (Registration Nos. 333-285115 and 333-285115-01) filed by the Company and the Guarantor (the "<u>Registration Statement</u>"). The Company and the Guarantor have entered into an Underwriting Agreement dated September 3, 2025, by and among the Company, the Guarantor, and BMO Capital Markets Corp., MUFG Securities Americas Inc., Santander US Capital Markets LLC and U.S. Bancorp Investments, Inc., for themselves and as Representatives of the other Underwriters listed on Schedule I thereto (the "<u>Underwriting Agreement</u>"), relating to the sale of the Notes and the Guarantee. Capitalized terms not defined herein shall have such meanings as are set forth in the Underwriting Agreement.

In our capacity as counsel to the Guarantor and the Company, we have examined the Registration Statement. We also have examined originals, or duplicates or conformed copies, of such documents, corporate records, agreements and other instruments, and have made such other investigations, as we have deemed relevant and necessary for purposes of the opinions hereinafter set forth. As to questions of fact material to this opinion letter, we have relied upon certificates or comparable documents of public officials and upon oral or written statements and representations of officers and representatives of the Guarantor and the Company.

------

Southern Company Gas

Southern Company Gas Capital Corporation

September 8, 2025

During the course of such examination and review, and in connection with furnishing the opinions set forth below, we have assumed the accuracy and completeness of all documents and records that we have reviewed, the genuineness of all signatures, the legal capacity of all natural persons, the authenticity of the documents submitted to us as originals and the conformity to authentic original documents of all documents submitted to us as certified, conformed or reproduced copies. We are familiar with the proceedings taken and proposed to be taken by the Guarantor and the Company in connection with the authorization and issuance of the Notes and the Guarantee, and, for the purposes of this opinion letter, we have assumed that any future, similar or other required proceedings will be timely completed in the manner presently contemplated.

To the extent that the obligations of the Guarantor and the Company under the Notes may be dependent upon such matters, we assume for purposes of this opinion letter that (i) the Trustee is and has been duly organized, validly existing and in good standing under the laws of its jurisdiction of organization and is duly qualified to engage in the activities contemplated by the Indenture; (ii) the Indenture has been duly authorized, executed and delivered by, and constitutes the legal, valid and binding obligation of, the Trustee, enforceable against the Trustee in accordance with its terms; (iii) the Trustee is in compliance, generally and with respect to acting as a trustee under the Indenture, with all applicable laws and regulations; (iv) the Trustee had and has the requisite organizational and legal power and authority to perform its obligations under the Indenture; and (v) the global note No. EE-1 representing the Notes (the "<u>Global Note</u>") will be duly authenticated by the Trustee in the manner provided in the Indenture.

Based upon the foregoing, and subject to the limitations, qualifications, exceptions and assumptions set forth herein, we are of the opinion that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.The Notes have been authorized by all necessary corporate action on the part of the Company and, when the Global Note is executed by the Company and authenticated by the Trustee in accordance with the provisions of the Indenture and delivered and paid for as provided in the Underwriting Agreement, will be legal, valid and binding obligations of the Company, enforceable against the Company in accordance with their terms.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.The Guarantee has been authorized by all necessary corporate action on the part of the Guarantor and, when the Guarantee is executed by the Guarantor and delivered in the manner contemplated by the Underwriting Agreement and the Indenture, and when the Global Note is executed by the Company and authenticated by the Trustee in accordance with the provisions of the Indenture and delivered and paid for as provided in the Underwriting Agreement, the Guarantee will be the legal, valid and binding obligation of the Guarantor, enforceable against the Guarantor in accordance with its terms.

The opinions provided above are subject to the following exceptions, limitations and qualifications: (i) the effect of bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally; and (ii) general principles of equity, whether considered in a proceeding at law or in equity.

------

Southern Company Gas

Southern Company Gas Capital Corporation

September 8, 2025

Our examination of matters of law in connection with the opinions expressed herein has been limited to, and accordingly our opinions expressed herein are limited to, the federal law of the United States of America, the laws of the State of Georgia and, to the extent set forth herein, the law of the State of New York. We express no opinion with respect to the laws of any other jurisdiction. For purposes of the opinions provided above, we have relied upon (i) the opinion of Balch & Bingham LLP, counsel for the Company, with respect to matters governed by the laws of the State of Alabama, a copy of which opinion has been filed as Exhibit 5.2(b) to the Guarantor's Current Report on Form 8-K, dated September 3, 2025, which is incorporated by reference in the Registration Statement, and (ii) the opinion of Hunton Andrews Kurth LLP, counsel to the Underwriters, with respect to matters governed by the laws of the State of New York, a copy of which is attached hereto as Annex I.

This opinion is given as of the date hereof, and we assume no obligation to advise you after the date hereof of facts or circumstances that come to our attention or changes in law that occur that could affect the opinions contained herein.

This opinion letter is being furnished in connection with the offer and sale of the Notes and the Guarantee pursuant to the registration requirements of the Securities Act of 1933, as amended (the "<u>Securities Act</u>"). We hereby consent to your filing this opinion as an exhibit to the Guarantor's Current Report on Form 8-K, dated September 3, 2025, which is incorporated by reference in the Registration Statement, and to the reference to our firm contained under the caption "Legal Matters" in the prospectus included therein. In giving this consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Securities and Exchange Commission promulgated 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; Sincerely,

/s/ Troutman Pepper Locke LLP

------

Southern Company Gas

Southern Company Gas Capital Corporation

September 8, 2025

**Annex I**

**Opinion of Hunton Andrews Kurth LLP**

Attached.

------

Annex I

[Letterhead of Hunton Andrews Kurth LLP]

September 8, 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 Nos. 333-285115 and 333-285115-01) (the "Registration Statement") relating to $425,000,000 aggregate principal amount of Southern Company Gas Capital Corporation's (the "Company") Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Notes") and the related guarantee thereof (the "Guarantee") by Southern Company Gas (the "Guarantor"). The Notes will be issued pursuant to an indenture dated as of February 1, 2025 (the "Indenture"), by and among the Company, as issuer, the Guarantor, as guarantor, and U.S. Bank Trust Company, National Association, as trustee (the "Trustee").

We have examined the Registration Statement and the Indenture, which has been filed with the Securities and Exchange 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 by general principles of equity, whether considered in a proceeding at law or in equity.

------

Troutman Pepper Locke LLP

September 8, 2025

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion that the Guarantee is a valid, binding and legal obligation of the Guarantor, 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.

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. 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 Securities and Exchange Commission thereunder. This opinion letter may not be relied upon, furnished or quoted by you for any other purpose, without our prior written consent.

Very truly yours,

/s/ Hunton Andrews Kurth LLP

## Exhibit 5.2

Exhibit 5.2(a)

[Letterhead of Balch & Bingham LLP]

September 8, 2025

Southern Company Gas Capital Corporation

3535 Colonnade Parkway

Birmingham, Alabama 35243

**RE:&nbsp;&nbsp;&nbsp;&nbsp; Southern Company Gas Capital Corporation**

**Registration Statement on Form S-3**

Ladies and Gentlemen:

We have acted as special Alabama counsel to Southern Company Gas Capital Corporation (the "Company") in connection with the Registration Statement on Form S-3 (Registration Statement No. 333-285115 and 333-285115-01) filed with the Securities and Exchange Commission (the "Commission") on February 21, 2025 (the "Registration Statement"), under the Securities Act of 1933, as amended (the "Act"), relating to $425,000,000 aggregate principal amount of the Company's Series 2025A 4.05% Senior Notes due September 15, 2028 (the "Notes") and the related guarantee thereof (the "Guarantee") by Southern Company Gas, a Georgia corporation (the "Guarantor"). The Notes will be issued pursuant to the Indenture, dated as of February 1, 2025 (the "Indenture"), among the Company, the Guarantor and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"). The Company and the Guarantor have entered into an Underwriting Agreement dated September 3, 2025 by and among the Company, the Guarantor, BMO Capital Markets Corp., MUFG Securities Americas Inc., Santander US Capital Markets LLC and U.S. Bancorp Investments, Inc., as representatives of the several Underwriters listed on Schedule I thereto (the Underwriting Agreement"), relating to the sale of the Notes and the Guarantee.

We have examined the Underwriting Agreement, the Registration Statement, the Indenture, which has been filed with the Commission as an exhibit to the Registration Statement, a specimen of the Notes, the Unanimous Written Consent of the Board of Directors of the Company dated February 19, 2025, authorizing and approving the Registration Statement, the issuance and sale of the securities described in the Registration Statement and matters related thereto, the Unanimous Written Consent of the Board of Directors of the Company dated February 19, 2025, authorizing the Notes and the Officers' Certificate Pursuant to Section 301 of the Indenture of Grace A. Kolvereid, Executive Vice President, Chief Financial Officer, Chief Risk

------

Southern Company Gas Capital

September 8, 2025

Officer and Treasurer of the Company and Marcia R. DeMar, Corporate Secretary, dated September 8, 2025, establishing the Notes as a series of securities to be issued under the Indenture with the terms and characteristics as described therein. 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. In such examination, we have assumed (i) all information contained in all documents reviewed by us is true and correct, (ii) the genuineness of all signatures on all original documents, (iii) the legal capacity and authority of natural persons, (iv) the authenticity of all documents submitted to us as originals, (v) the conformity to the original documents of all copies submitted to us, (vi) the truth, accuracy and completeness of the factual matters contained in the documents reviewed by us and (vii) the due execution and delivery of all documents where due execution and delivery are prerequisite to the effectiveness thereof. As to questions of fact material to the opinions set forth below, we have relied upon certificates or comparable documents of public officials and of officers and representatives of the Company.

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;1.The Company is a corporation duly incorporated, validly existing and in good standing under the laws of the State of Alabama.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.The Underwriting Agreement and the Notes have been authorized by all necessary corporate action on the part of the Company.

We are members of the State Bar of Alabama and we do not express any opinion herein concerning any law other than the law of the State of Alabama. We express no opinion with respect to the laws of any other jurisdiction.

This opinion letter is being furnished in connection with the offer and sale of the Notes and the Guarantee pursuant to the registration requirements of the Act. We hereby consent to the reliance upon this opinion of Troutman Pepper Locke LLP, counsel to the Company and the Guarantor, in connection with that firm's opinion to the Company and the Guarantor.

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

------

Southern Company Gas Capital Corporation

September 8, 2025

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 prior written consent.

Very truly yours,<br>/s/Balch & Bingham LLP

## Exhibit 5.2

Exhibit 5.2(b)

[Letterhead of Balch & Bingham LLP]

September 8, 2025

Southern Company Gas Capital Corporation

3535 Colonnade Parkway

Birmingham, Alabama 35243

**RE:&nbsp;&nbsp;&nbsp;&nbsp; Southern Company Gas Capital Corporation**

**Registration Statement on Form S-3**

Ladies and Gentlemen:

We have acted as special Alabama counsel to Southern Company Gas Capital Corporation (the "Company") in connection with the Registration Statement on Form S-3 (Registration Statement No. 333-285115 and 333-285115-01) filed with the Securities and Exchange Commission (the "Commission") on February 21, 2025 (the "Registration Statement"), under the Securities Act of 1933, as amended (the "Act"), relating to $425,000,000 aggregate principal amount of the Company's Series 2025B 5.10% Senior Notes due September 15, 2035 (the "Notes") and the related guarantee thereof (the "Guarantee") by Southern Company Gas, a Georgia corporation (the "Guarantor"). The Notes will be issued pursuant to the Indenture, dated as of February 1, 2025 (the "Indenture"), among the Company, the Guarantor and U.S. Bank Trust Company, National Association, as trustee (the "Trustee"). The Company and the Guarantor have entered into an Underwriting Agreement dated September 3, 2025 by and among the Company, the Guarantor, BMO Capital Markets Corp., MUFG Securities Americas Inc., Santander US Capital Markets LLC and U.S. Bancorp Investments, Inc., as representatives of the several Underwriters listed on Schedule I thereto (the Underwriting Agreement"), relating to the sale of the Notes and the Guarantee.

We have examined the Underwriting Agreement, the Registration Statement, the Indenture, which has been filed with the Commission as an exhibit to the Registration Statement, a specimen of the Notes, the Unanimous Written Consent of the Board of Directors of the Company dated February 19, 2025, authorizing and approving the Registration Statement, the issuance and sale of the securities described in the Registration Statement and matters related thereto, the Unanimous Written Consent of the Board of Directors of the Company dated February 19, 2025, authorizing the Notes and the Officers' Certificate Pursuant to Section 301 of the Indenture of Grace A. Kolvereid, Executive Vice President, Chief Financial Officer, Chief Risk

------

Southern Company Gas Capital Corporation

September 8, 2025

Officer and Treasurer of the Company and Marcia R. DeMar, Corporate Secretary, dated September 8, 2025, establishing the Notes as a series of securities to be issued under the Indenture with the terms and characteristics as described therein. 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. In such examination, we have assumed (i) all information contained in all documents reviewed by us is true and correct, (ii) the genuineness of all signatures on all original documents, (iii) the legal capacity and authority of natural persons, (iv) the authenticity of all documents submitted to us as originals, (v) the conformity to the original documents of all copies submitted to us, (vi) the truth, accuracy and completeness of the factual matters contained in the documents reviewed by us and (vii) the due execution and delivery of all documents where due execution and delivery are prerequisite to the effectiveness thereof. As to questions of fact material to the opinions set forth below, we have relied upon certificates or comparable documents of public officials and of officers and representatives of the Company.

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;1.The Company is a corporation duly incorporated, validly existing and in good standing under the laws of the State of Alabama.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.The Underwriting Agreement and the Notes have been authorized by all necessary corporate action on the part of the Company.

We are members of the State Bar of Alabama and we do not express any opinion herein concerning any law other than the law of the State of Alabama. We express no opinion with respect to the laws of any other jurisdiction.

This opinion letter is being furnished in connection with the offer and sale of the Notes and the Guarantee pursuant to the registration requirements of the Act. We hereby consent to the reliance upon this opinion of Troutman Pepper Locke LLP, counsel to the Company and the Guarantor, in connection with that firm's opinion to the Company and the Guarantor.

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

------

Southern Company Gas Capital Corporation

September 8, 2025

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 prior written consent.

Very truly yours,<br>/s/Balch & Bingham LLP

## Exhibit 8.1

Exhibit 8.1(a)

[Letterhead of Troutman Pepper Locke LLP]

September 8, 2025

Southern Company Gas

Ten Peachtree Place, N.E.

Atlanta, Georgia 30309

Southern Company Gas Capital Corporation

3535 Colonnade Parkway

Birmingham, Alabama 35243

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

Ladies and Gentlemen:

We have acted as counsel to Southern Company Gas, a Georgia corporation (the "Guarantor"), and as special counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), in connection with the Registration Statement on Form S-3 (Registration Statement Nos. 333-285115 and 333-285115-01) including the Prospectus dated February 21, 2025 (the "Prospectus") included in the Registration Statement, and a Prospectus Supplement dated September 3, 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 $425,000,000 aggregate principal amount of the Company's Series 2025A 4.05% Senior Notes due September 15, 2028 (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 and 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

------

September 8, 2025

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, 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 Guarantor's Current Report on Form 8-K, dated September 3, 2025, which is incorporated by reference in 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.

Sincerely,

/s/ Troutman Pepper Locke LLP

## Exhibit 8.1

Exhibit 8.1(b)

[Letterhead of Troutman Pepper Locke LLP]

September 8, 2025

Southern Company Gas

Ten Peachtree Place, N.E.

Atlanta, Georgia 30309

Southern Company Gas Capital Corporation

3535 Colonnade Parkway

Birmingham, Alabama 35243

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

Ladies and Gentlemen:

We have acted as counsel to Southern Company Gas, a Georgia corporation (the "Guarantor"), and as special counsel to Southern Company Gas Capital Corporation, an Alabama corporation (the "Company"), in connection with the Registration Statement on Form S-3 (Registration Statement Nos. 333-285115 and 333-285115-01) including the Prospectus dated February 21, 2025 (the "Prospectus") included in the Registration Statement, and a Prospectus Supplement dated September 3, 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 $425,000,000 aggregate principal amount of the Company's Series 2025B 5.10% Senior Notes due September 15, 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 and 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

------

September 8, 2025

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, 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 Guarantor's Current Report on Form 8-K, dated September 3, 2025, which is incorporated by reference in 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.

Sincerely,

/s/ Troutman Pepper Locke LLP

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