THE SOUTHERN COMPANY TO WELLS FARGO BANK, NATIONAL ASSOCIATION, TRUSTEE _______________ FOURTH SUPPLEMENTAL INDENTURE DATED AS OF JUNE 21, 2017 _______________ $500,000,000 SERIES 2017A 5.325% JUNIOR SUBORDINATED NOTES DUE JUNE 21, 2057 TABLE OF CONTENTS1

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THIS FOURTH SUPPLEMENTAL INDENTURE is made as of the 21^st day of June, 2017, by and between THE SOUTHERN COMPANY, a Delaware corporation, 30 Ivan Allen Jr. Blvd., N.W., Atlanta, Georgia 30308 (the “Company”), and WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association, 150 East 42^nd Street, 40^th Floor, New York, New York 10017 (the “Trustee”).

WHEREAS, the Company has heretofore entered into a Subordinated Note Indenture, dated as of October 1, 2015 (the “Original Indenture”), with Wells Fargo Bank, National Association;

WHEREAS, the Original Indenture is incorporated herein by this reference and the Original Indenture, as heretofore supplemented and as further supplemented by this Fourth Supplemental Indenture, is herein called the “Indenture”;

WHEREAS, under the Original Indenture, a new series of Junior Subordinated Notes may at any time be established pursuant to a supplemental indenture executed by the Company and the Trustee;

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

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

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

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

SECTION 101. Establishment. There is hereby established a new series of Junior Subordinated Notes to be issued under the Indenture, to be designated as the Company’s Series 2017A 5.325% Junior Subordinated Notes due June 21, 2057 (the “Series 2017A Notes”).

There are to be authenticated and delivered $500,000,000 principal amount of Series 2017A Notes, and such principal amount of the Series 2017A Notes may be increased from time to time pursuant to Section 301 of the Original Indenture. All Series 2017A Notes need not be issued at the same time and such series may be reopened at any time, without the consent of any Holder, for

issuances of additional Series 2017A Notes. Any such additional Series 2017A Notes will have the same interest rate, maturity and other terms as those initially issued (except for the public offering price and issue date and the initial interest accrual date and initial Interest Payment Date (as defined below), if applicable). No Series 2017A Notes shall be authenticated and delivered in excess of the principal amount as so increased except as provided by Sections 203, 303, 304, 907 or 1107 of the Original Indenture. The Series 2017A Notes shall be issued in fully registered form.

The Series 2017A Notes shall be issued in the form of one or more Global Securities in substantially the form set out in Exhibit A hereto. The Depositary with respect to the Series 2017A Notes shall be The Depository Trust Company.

The form of the Trustee’s Certificate of Authentication for the Series 2017A Notes shall be in substantially the form set forth in Exhibit B hereto.

Each Series 2017A Note shall be dated the date of authentication thereof and shall bear interest from the date of original issuance thereof or from the most recent Interest Payment Date to which interest has been paid or duly provided for.

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

“1933 Act” has the meaning set forth in Section 106 of this Fourth Supplemental Indenture.

“Additional Interest” has the meaning set forth in Section 104 of this Fourth Supplemental Indenture.

“Administrative Action” means any judicial decision or any official administrative pronouncement, ruling, regulatory procedure, notice or announcement including any notice or announcement of intent to issue or adopt any administrative pronouncement, ruling, regulatory procedure or regulation.

“Applicable Rating Agency” means any Rating Agency that (i)(a) published a rating for the Company on the date of initial issuance of the Series 2017A Notes and (b) publishes a rating for the Company at such time as a Rating Agency Event occurs, or (ii) any successor to a Rating Agency described in the preceding clause (i).

“Distribution Compliance Period” has the meaning set forth in Section 107 of this Fourth Supplemental Indenture.

“Interest Payment Dates” means June 21 and December 21 of each year, commencing December 21, 2017.

“Optional Deferral Period” has the meaning set forth in Section 104 of this Fourth Supplemental Indenture.

“Original Issue Date” means June 21, 2017.

“Rating Agency” means any nationally recognized statistical rating organization (within the meaning of Section 3(a)(62) of the Securities Exchange Act of 1934, as amended).

“Rating Agency Event” means a change to the methodology or criteria that were employed by an Applicable Rating Agency for purposes of assigning equity credit to securities such as the Series 2017A Notes on the date of initial issuance of the Series 2017A Notes (the “current methodology”), which change either (i) shortens the period of time during which equity credit pertaining to the Series 2017A Notes would have been in effect had the current methodology not been changed by the Applicable Rating Agency, or (ii) reduces the amount of equity credit assigned to the Series 2017A Notes by the Applicable Rating Agency as compared with the amount of equity credit that such Rating Agency assigned to the Series 2017A Notes as of the date of initial issuance of the Series 2017A Notes.

“Regular Record Date” means, with respect to each Interest Payment Date, the close of business (i) on the Business Day immediately preceding such Interest Payment Date if any Series 2017A Notes are issuable in the form of one or more Global Securities or (ii) on the 15th calendar day preceding such Interest Payment Date if no Series 2017A Notes are issuable in the form of one or more Global Securities (whether or not a Business Day).

“Regulation S Global Note” has the meaning set forth in Section 106 of this Fourth Supplemental Indenture.

“Regulation S Legend” has the meaning set forth in Section 106 of this Fourth Supplemental Indenture.

“Rule 144A Global Note” has the meaning set forth in Section 106 of this Fourth Supplemental Indenture.

“Rule 144A Legend” has the meaning set forth in Section 106 of this Fourth Supplemental Indenture.

“Securities Rate” has the meaning set forth in Section 103 of this Fourth Supplemental Indenture.

“Stated Maturity” means June 21, 2057.

“Tax Event” means that the Company shall have received an Opinion of Counsel experienced in such matters to the effect that, as a result of:

(a) any amendment to, clarification of, or change, including any announced prospective change, in the laws or treaties of the United States or any political subdivisions or taxing authorities, or any regulations under those laws or treaties;

(b) an Administrative Action;

(c) any amendment to, clarification of, or change in the official position or the interpretation of any Administrative Action or any interpretation or pronouncement that provides for a position

with respect to an Administrative Action that differs from the previously generally accepted position, in each case by any legislative body, court, governmental authority or regulatory body, regardless of the time or manner in which that amendment, clarification or change is introduced or made known; or

(d) a threatened challenge asserted in writing in connection with an audit of the Company or an audit of any of the subsidiaries of the Company, or a publicly-known threatened challenge asserted in writing against any other taxpayer that has raised capital through the issuance of securities that are substantially similar to the Series 2017A Notes, which amendment, clarification or change is effective or the Administrative Action is taken or issued, or interpretation or pronouncement is issued or threatened challenge is asserted or becomes publicly-known after the date of original issuance of the Series 2017A Notes, there is more than an insubstantial risk that interest payable by the Company on the Series 2017A Notes is not deductible, or within 90 days of the date of such opinion would not be deductible, in whole or in part, by the Company for United States federal income tax purposes.

SECTION 103. Payment of Principal and Interest. The principal of the Series 2017A Notes shall be due at the Stated Maturity (unless earlier redeemed). The unpaid principal amount of the Series 2017A Notes shall bear interest at the rate of 5.325% per annum (the “Securities Rate”) until paid or duly provided for. Interest shall be paid semi-annually in arrears on each Interest Payment Date to the Person in whose name the Series 2017A Notes are registered at the close of business on the Regular Record Date for such Interest Payment Date, provided that interest payable at the Stated Maturity or on a Redemption Date as provided herein will be paid to the Person to whom principal is payable. So long as an Optional Deferral Period is not occurring, any such interest that is not so punctually paid or duly provided for will forthwith cease to be payable to the Holders on such Regular Record Date and may either be paid to the Person or Persons in whose name the Series 2017A Notes are registered at the close of business on a Special Record Date for the payment of such defaulted interest to be fixed by the Trustee, notice whereof shall be given to Holders of the Series 2017A Notes not less than ten (10) days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange, if any, on which the Series 2017A Notes shall be listed, and upon such notice as may be required by any such exchange, all as more fully provided in the Original Indenture.

Payments of interest on the Series 2017A Notes will include interest accrued to but excluding the respective Interest Payment Dates. Interest payments for the Series 2017A Notes shall be computed and paid on the basis of a 360-day year of twelve 30-day months. In the event that any date on which interest is payable on the Series 2017A Notes is not a Business Day, then payment of the interest payable on such date will be made on the next succeeding day that is a Business Day (and without any interest or other payment in respect of any such delay), with the same force and effect as if made on the date the payment was originally payable.

Payment of the principal and interest (including Additional Interest) due at the Stated Maturity or earlier redemption of the Series 2017A Notes shall be made upon surrender of the Series 2017A Notes at the Corporate Trust Office of the Trustee. The principal of and interest on the Series 2017A Notes (including Additional Interest) shall be paid in such coin or currency of the United

States of America as at the time of payment is legal tender for payment of public and private debts. Payments of interest (including interest on any Interest Payment Date)(including Additional Interest) will be made, subject to such surrender where applicable, at the option of the Company, (i) by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or (ii) by wire transfer or other electronic transfer at such place and to such account at a banking institution in the United States as may be designated in writing to the Trustee at least sixteen (16) days prior to the date for payment by the Person entitled thereto.

SECTION 104. Deferral of Interest Payments. So long as no Event of Default has occurred and is continuing, the Company may, at its option, on one or more occasions, defer payment of all or part of the current and accrued interest otherwise due on the Series 2017A Notes by extending the interest payment period for up to ten (10) consecutive years (each period, commencing on the date that the first such interest payment would otherwise have been made, an “Optional Deferral Period”). A deferral of interest payments may not extend beyond the Stated Maturity or end on a day other than an Interest Payment Date. Any deferred interest on the Series 2017A Notes will accrue additional interest at the Securities Rate from the applicable Interest Payment Date to the date of payment, compounded semi-annually (such deferred interest and additional interest accrued thereon, “Additional Interest”), to the extent permitted under applicable law. No interest shall be due and payable during an Optional Deferral Period, except at the end of such Optional Deferral Period or upon a redemption of the Series 2017A Notes during such Optional Deferral Period.

So long as no Event of Default has occurred and is continuing, prior to the termination of any Optional Deferral Period, the Company may further defer the payment of interest by extending such Optional Deferral Period; provided that such Optional Deferral Period together with all such previous and further deferrals of interest payments shall not exceed ten (10) consecutive years at any one time or extend beyond the Stated Maturity. Upon the termination of any Optional Deferral Period, which shall be an Interest Payment Date, the Company shall pay all interest accrued and unpaid on the Series 2017A Notes, including any Additional Interest, to the Person in whose name the Series 2017A Notes are registered on the Regular Record Date for such Interest Payment Date, provided that interest accrued and unpaid on the Series 2017A Notes, including any Additional Interest, payable at Stated Maturity or on any Redemption Date will be paid to the Person to whom principal is payable. Once the Company pays all interest accrued and unpaid on the Series 2017A Notes, including any Additional Interest, it shall be entitled again to defer interest payments on the Series 2017A Notes as described above.

During an Optional Deferral Period, subject to the next succeeding sentence, the Company (a) shall not declare or pay any dividend or make any distributions with respect to, or redeem, purchase, acquire or make a liquidation payment with respect to, any of its capital stock, and (b) shall not make any payment of interest, principal or premium, if any, on or repay, repurchase or redeem any debt securities (including guarantees) issued by the Company which rank pari passu with or junior to the Series 2017A Notes. The preceding sentence, however, shall not restrict (i) any of the actions described in the preceding sentence resulting from any reclassification of the Company’s capital stock or the exchange or conversion of one class or series of the Company’s capital stock for another class or series of the Company’s capital stock, (ii) the purchase of fractional interests in shares of the Company’s capital stock pursuant to the conversion or exchange provisions

of such capital stock or the security being converted or exchanged, (iii) dividends, payments or distributions payable in shares of capital stock, (iv) redemptions, purchases or other acquisitions of shares of capital stock in connection with any employment contract, incentive plan, benefit plan or other similar arrangement of the Company or any of its subsidiaries or in connection with a dividend reinvestment or stock purchase plan, or (v) any declaration of a dividend in connection with implementation of any stockholders’ rights plan, or the issuance of rights, stock or other property under any such plan, or the redemption, repurchase or other acquisition of any such rights pursuant thereto.

The Company shall provide to the Trustee notice, as provided in Section 105 of the Original Indenture, of its selection or extension of an Optional Deferral Period at least 10 Business Days and not more than 60 Business Days prior to the earlier of (a) the next applicable Interest Payment Date or (b) the date, if any, upon which the Company is required to give notice of such Interest Payment Date or the Regular Record Date thereof to any applicable self-regulatory organization. In addition, the Company shall deliver to the Trustee an Officers’ Certificate stating that no default or Event of Default shall have occurred and be continuing. Subject to receipt of such Officers’ Certificate, the Trustee shall forward such notice promptly to the Holders of the Series 2017A Notes as provided in Section 106 of the Original Indenture.

SECTION 105. Denominations. The Series 2017A Notes may be issued in the denominations of $200,000 and integral multiples of $1,000 in excess thereof.

SECTION 106. Global Securities. The Series 2017A Notes will be issued in the form of one or more Global Securities registered in the name of the Depositary (which shall be The Depository Trust Company) or its nominee. The Series 2017A Notes will be initially issued pursuant to an exemption or exemptions from the registration requirements of the Securities Act of 1933, as amended (the “1933 Act”). Beneficial interests in the Series 2017A Notes offered and sold to “qualified institutional buyers” (as defined in Rule 144A under the 1933 Act) in reliance upon Rule 144A under the 1933 Act shall be represented by one or more separate Global Securities (each, a “Rule 144A Global Note”). Each Rule 144A Global Note shall bear the Rule 144A legend in substantially the form set forth in Exhibit A hereto (the “Rule 144A Legend”). Beneficial interests in the Series 2017A Notes offered and sold to purchasers outside of the United States pursuant to Regulation S under the 1933 Act shall be represented by one or more separate Global Securities (each, a “Regulation S Global Note”) and shall bear the Regulation S legend in substantially the form set forth in Exhibit A hereto (the “Regulation S Legend”).

Owners of beneficial interests in such a Global Security will not be considered the Holders thereof for any purpose under the Indenture, and no Global Security representing a Series 2017A Note shall be exchangeable, except for another Global Security of like denomination and tenor to be registered in the name of the Depositary or its nominee or to a successor Depositary or its nominee. The rights of Holders of such Global Security shall be exercised only through the Depositary.

Subject to the procedures of the Depositary, a Global Security shall be exchangeable for Series 2017A Notes registered in the names of persons other than the Depositary or its nominee only if (i) the Depositary notifies the Company that it is unwilling or unable to continue as a Depositary for such Global Security and no successor Depositary shall have been appointed by the

Company, or if at any time the Depositary ceases to be a clearing agency registered under the Securities Exchange Act of 1934, as amended, at a time when the Depositary is required to be so registered to act as such Depositary and no successor Depositary shall have been appointed by the Company, in each case within 90 days after the Company receives such notice or becomes aware of such cessation, (ii) the Company in its sole discretion determines that such Global Security shall be so exchangeable, or (iii) there shall have occurred an Event of Default with respect to the Series 2017A Notes. Any Global Security that is exchangeable pursuant to the preceding sentence shall be exchangeable for Series 2017A Notes registered in such names as the Depositary shall direct.

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

SECTION 107. Transfer. A Rule 144A Global Note may not be transferred on the Security Register except in compliance with the restrictions on transfer contained in the Rule 144A Legend and upon receipt by the Security Registrar of a completed and executed Transfer Certificate in the form contained in Exhibit A hereto. Prior to the expiration of 40 days beginning on and including the later of (i) the day on which the offering of the Series 2017A Notes commences and (ii) the Original Issue Date (the “Distribution Compliance Period”), a Regulation S Global Note may not be transferred on the Security Register except in compliance with the restrictions on transfer contained in the Regulation S Legend and upon receipt by the Security Registrar of a completed and executed Transfer Certificate in the form contained in Exhibit A. No service charge will be made for any transfer or exchange of Series 2017A Notes, but payment will be required of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection therewith.

The transfer and exchange of beneficial interests in the Global Securities shall be effected through the Depositary, in accordance with this Fourth Supplemental Indenture (including applicable restrictions on transfer set forth herein, if any) and the procedures of the Depositary therefor.

Until the expiration of the Distribution Compliance Period, transfers by an owner of a beneficial interest in a Regulation S Global Note to a transferee who takes delivery of such interest through a Rule 144A Global Note will be made only upon receipt by the Trustee of a completed and executed Transfer Certificate in the form contained in Exhibit A hereto from the transferor of the beneficial interest to the effect that such transfer is being made to a person whom the transferor reasonably believes is a qualified institutional buyer (as defined in Rule 144A under the Securities Act) in a transaction meeting the requirements of Rule 144A and the requirements of applicable securities laws of any state of the United States or any other jurisdiction.

Transfers by an owner of a beneficial interest in the Rule 144A Global Note to a transferee who takes delivery through the Regulation S Global Note, whether before or after the expiration of the Distribution Compliance Period, will be made only upon receipt by the Trustee of a Transfer Certificate in the form contained in Exhibit A hereto from the transferor to the effect that such transfer is being made in accordance with Regulation S or Rule 144 under the Securities Act and that, if such transfer is being made prior to the expiration of the Distribution Compliance Period,

the interest transferred will be held immediately thereafter through Euroclear Bank S.A./N.V., as operator of the Euroclear System or Clearstream Banking, société anonyme, Luxembourg.

Any beneficial interest in one of the Global Securities that is transferred to a person who takes delivery in the form of an interest in another Global Security will, upon transfer, cease to be an interest in the initial Global Security and will become an interest in the other Global Security and, accordingly, will thereafter be subject to all transfer restrictions, if any, and other procedures applicable to beneficial interests in such other Global Security for as long as it remains such an interest.

Transfers of beneficial interests between a Rule 144A Global Note and a Regulation S Global Note, and other transfers relating to beneficial interests in the Global Securities, shall be reflected by endorsements of the Trustee, as custodian for The Depository Trust Company, on the schedules attached to such Rule 144A Global Note and Regulation S Global Note.

Neither the Trustee, the Security Registrar nor any transfer agent shall have any obligation or duty to monitor, determine or inquire as to compliance with any restrictions on transfer imposed under the Indenture or under applicable law with respect to any transfer of any interest in any Series 2017A Note (including any transfers between or among Depositary participants, members or beneficial owners in any Global Security) other than to require delivery of such certificates and other documentation or evidence as are expressly required by, and to do so if and when expressly required by, the terms of the Indenture, and to examine the same to determine substantial compliance as to form with the express requirements hereof.

Neither the Company nor the Trustee shall have any liability for acts or omissions of the Depositary, for the Depositary records of beneficial interest, for any transactions between the Depositary, any participant member of the Depositary and/or beneficial owner of any interest in any Series 2017A Notes, or in respect of any transfers effected by the Depositary or by any participant member of the Depositary or any beneficial owner of any interest in any Series 2017A Notes held through any such participant member of the Depositary.

The Company shall not be required (a) to issue, register the transfer of or exchange any Series 2017A Notes during a period beginning at the opening of business fifteen (15) days before the day of the mailing of a notice pursuant to Section 1104 of the Original Indenture identifying the serial numbers of the Series 2017A Notes to be called for redemption, and ending at the close of business on the day of the mailing, or (b) to register the transfer of or exchange any Series 2017A Notes theretofore selected for redemption in whole or in part, except the unredeemed portion of any Series 2017A Notes redeemed in part.

SECTION 108. Redemption at the Company’s Option. At any time and from time to time on or after June 21, 2022, the Series 2017A Notes will be subject to redemption at the option of the Company in whole or in part upon not less than 30 nor more than 60 days’ notice, at a Redemption Price equal to 100% of the principal amount of the Series 2017A Notes being redeemed plus accrued and unpaid interest (including any Additional Interest) on the Series 2017A Notes being redeemed to the Redemption Date.

In addition, before June 21, 2022, if a Tax Event shall occur and be continuing, the Company may redeem the Series 2017A Notes following the occurrence of that Tax Event, in whole, but not in part, at a Redemption Price equal to 100% of the principal amount to be redeemed plus any accrued but unpaid interest (including any Additional Interest) to the Redemption Date.

In addition, before June 21, 2022, if a Rating Agency Event shall occur and be continuing, the Company may redeem the Series 2017A Notes following the occurrence of that Rating Agency Event, in whole, but not in part, at a Redemption Price equal to 102% of the principal amount to be redeemed plus any accrued but unpaid interest (including any Additional Interest) to the Redemption Date.

In the event of redemption of the Series 2017A Notes in part only, a new Series 2017A Note or Notes for the unredeemed portion will be issued in the name or names of the Holders thereof upon the surrender thereof.

The Series 2017A Notes will not have a sinking fund.

Notice of redemption shall be given as provided in Section 1104 of the Original Indenture.

Any redemption of less than all of the Series 2017A Notes shall, with respect to the principal thereof, be divisible by $1,000.

SECTION 109. Events of Default.

The Event of Default set forth in Section 501(5) of the Original Indenture shall not apply to the Series 2017A Notes. The Events of Default set forth in paragraphs (1), (3), (6) and (7) shall apply to the Series 2017A Notes.

For purposes of this Section 109, the term “Default” means the following event: default in the performance or breach of any covenant or warranty of the Company in the Indenture (other than a covenant or warranty (i) a default in whose performance or whose breach is addressed in any paragraph of Section 501 of the Original Indenture (other than Section 501(5)) or (ii) which has expressly been included in the Indenture solely for the benefit of one or more series of Junior Subordinated Notes other than the Series 2017A Notes), and continuance of such default or breach for a period of 90 days after there has been given, by registered or certified mail, to the Company by the Trustee, or to the Company and the Trustee by the Holders of at least 25% in principal amount of the Outstanding Series 2017A Notes, a written notice specifying such default or breach and requiring it to be remedied and stating that such notice is a “Notice of Covenant Default” hereunder.

Upon the occurrence and continuance of a Default, the Trustee and the Holders of the Series 2017A Notes shall have the same rights and remedies, and shall be subject to the same limitations, restrictions, protections and exculpations, and the Company shall be subject to the same obligations and restrictions, in each case, as would apply if such Default was an Event of Default or an event which after notice or lapse of time or both would become an Event of Default; provided, that the principal of and accrued interest on the Series 2017A Notes may not be declared immediately due and payable by reason of the occurrence and continuation of a Default, and any notice of declaration

or acceleration based on such Default shall be null and void with respect to the Series 2017A Notes; provided, further that in case a Default has occurred and is continuing, the Trustee shall not be subject to Section 601(b) of the Original Indenture unless an Event of Default has occurred and is continuing.

SECTION 110. Information to Holders. Upon the request of any Holder, any holder of a beneficial interest in the Series 2017A Notes, or the Trustee (on behalf of a Holder or a holder of a beneficial interest in the Series 2017A Notes), the Company will furnish such information as is specified in paragraph (d)(4) of Rule 144A promulgated under the 1933 Act to Holders (and to holders of beneficial interests in the Series 2017A Notes), to prospective purchasers of the Series 2017A Notes (and of beneficial interests in the Series 2017A Notes) who are qualified institutional buyers or to the Trustee for delivery to such Holder or prospective purchasers of the Series 2017A Notes or beneficial interests therein, as the case may be, unless, at the time of such request, the Company is subject to the reporting requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended.

Delivery of information to the Trustee pursuant to this Section 110 is for informational purposes only and the Trustee’s receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Company’s compliance with any of its covenants under the Indenture.

SECTION 201. Recitals by Company. The recitals in this Fourth Supplemental Indenture are made by the Company only and not by the Trustee, and all of the provisions contained in the Original Indenture in respect of the rights, privileges, immunities, powers and duties of the Trustee shall be applicable in respect of Series 2017A Notes and of this Fourth Supplemental Indenture as fully and with like effect as if set forth herein in full.

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

SECTION 203. Executed in Counterparts. This Fourth Supplemental Indenture may be simultaneously executed in several counterparts, each of which shall be deemed to be an original, and such counterparts shall together constitute but one and the same instrument.

SECTION 204. Legends. Except as determined by the Company in accordance with applicable law, each Series 2017A Note shall bear the applicable legends relating to restrictions on transfer pursuant to the securities laws in substantially the form set forth on Exhibit A hereto.

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

NEITHER THIS NOTE NOR ANY BENEFICIAL INTEREST HEREIN HAS BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “1933 ACT”). EACH HOLDER HEREOF, AND EACH OWNER OF A BENEFICIAL INTEREST HEREIN, BY PURCHASING THIS NOTE, AGREES FOR THE BENEFIT OF THE SOUTHERN COMPANY (THE “COMPANY”) THAT THIS NOTE MAY NOT BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED PRIOR TO THE DATE WHICH IS SIX MONTHS (IF ALL APPLICABLE CONDITIONS TO SUCH RESALE UNDER RULE 144 UNDER THE 1933 ACT (OR ANY SUCCESSOR PROVISION THEREOF) ARE SATISFIED) AFTER THE LATER OF THE ORIGINAL ISSUANCE DATE THEREOF, THE ISSUANCE DATE OF ANY SUBSEQUENT ISSUANCE OF ADDITIONAL NOTES OF THE SAME SERIES AND THE LAST DATE ON WHICH THE COMPANY OR ANY AFFILIATE THEREOF WAS THE OWNER OF THIS NOTE OR THE EXPIRATION OF SUCH SHORTER PERIOD AS MAY BE PRESCRIBED BY SUCH RULE 144 (OR SUCH SUCCESSOR PROVISION) PERMITTING RESALES OF THIS NOTE WITHOUT ANY CONDITIONS (THE “RESALE RESTRICTION TERMINATION DATE”) OTHER THAN (A)(1) TO THE COMPANY, (2) IN A TRANSACTION ENTITLED TO AN EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE 1933 ACT (IF AVAILABLE), (3) SO LONG AS THIS NOTE IS ELIGIBLE FOR RESALE PURSUANT TO RULE 144A UNDER THE 1933 ACT (“RULE 144A”), TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A PURCHASING FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE RESALE, PLEDGE OR OTHER TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A UNDER THE 1933 ACT (AS INDICATED BY THE BOX CHECKED BY THE TRANSFEROR ON THE CERTIFICATE OF TRANSFER ATTACHED TO THIS NOTE), (4) IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 903 OR 904 OF REGULATION S UNDER THE 1933 ACT (AS INDICATED BY THE BOX CHECKED BY THE TRANSFEROR ON THE CERTIFICATE OF TRANSFER ATTACHED TO THIS NOTE), (5) IN ACCORDANCE WITH ANOTHER APPLICABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE 1933 ACT (AND BASED UPON AN OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY), OR (6) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE 1933 ACT AND (B) IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. THE FOREGOING RESTRICTIONS ON RESALE WILL NOT APPLY SUBSEQUENT TO THE RESALE RESTRICTION TERMINATION DATE. THE HOLDER HEREOF, BY PURCHASING THIS NOTE, REPRESENTS AND AGREES FOR THE BENEFIT OF THE COMPANY THAT IT IS (i) A QUALIFIED INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A UNDER THE 1933 ACT OR (ii) A NON-U.S. PERSON OUTSIDE THE UNITED STATES WITHIN THE MEANING OF, OR AN ACCOUNT SATISFYING THE REQUIREMENTS OF, PARAGRAPH (k)(2) OF RULE 902 UNDER REGULATION S UNDER THE 1933 ACT. THE HOLDER OF THIS NOTE ACKNOWLEDGES THAT THE COMPANY OR THE TRUSTEE RESERVES THE RIGHT PRIOR TO ANY OFFER, SALE OR OTHER TRANSFER (1) PURSUANT TO CLAUSE (A)(2) PRIOR TO THE RESALE RESTRICTION TERMINATION DATE TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL,

CERTIFICATIONS OR OTHER INFORMATION SATISFACTORY TO THE COMPANY AND THE TRUSTEE AND (2) IN EACH OF THE FOREGOING CASES, TO REQUIRE THAT A CERTIFICATE AS TO COMPLIANCE WITH CERTAIN CONDITIONS TO TRANSFER IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO THE COMPANY AND THE TRUSTEE.

THE SECURITIES COVERED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “1933 ACT”), AND MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS (I) AS PART OF THEIR DISTRIBUTION AT ANY TIME OR (II) OTHERWISE UNTIL 40 DAYS AFTER THE LATER OF THE DATE OF THE COMMENCEMENT OF THE OFFERING OF THE SECURITIES AND THE DATE OF ORIGINAL ISSUANCE OF THE SECURITIES, EXCEPT IN EITHER CASE IN ACCORDANCE WITH REGULATION S OR RULE 144A UNDER THE 1933 ACT OR ANY OTHER AVAILABLE EXEMPTION FROM REGISTRATION UNDER THE 1933 ACT. TERMS USED ABOVE HAVE THE MEANINGS GIVEN TO THEM BY REGULATION S.

The Southern Company, a Delaware corporation (the “Company,” which term includes any successor corporation under the Indenture referred to on the reverse hereof), for value received, hereby promises to pay to _____________________________________, or registered assigns, the principal sum of _________ DOLLARS ($__________), or such other amount as indicated on the Schedule of Increases or Decreases in Global Security attached as Schedule I hereto, on the Stated Maturity shown above (or upon earlier redemption), and to pay interest thereon from the Original Issue Date shown above, or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually in arrears on each Interest Payment Date as specified above, commencing on December 21, 2017 and on the Stated Maturity (or upon earlier redemption) at the rate per annum shown above until the principal hereof is paid or made available for payment and at such rate on any overdue principal and on any overdue installment of interest. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date (other than an Interest Payment Date that is the Stated Maturity or on a Redemption Date) will, as provided in such Indenture, be paid to the Person in whose name this Note (the “Note”) is registered at the close of business on the Regular Record Date as specified above next preceding such Interest Payment Date, provided that any interest payable at the Stated Maturity or on any Redemption Date will be paid to the Person to whom principal is payable. Except as otherwise provided in the Indenture, any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Note is registered at the close of business on a Special Record Date for the payment of such defaulted interest to be fixed by the Trustee, notice whereof shall be given to Holders of Notes of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange, if any, on whic

h the Notes of this series shall be listed, and upon such notice as may be required by any such exchange, all as more fully provided in the Indenture.

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

So long as no Event of Default shall have occurred and be continuing, the Company may, at its option, on one or more occasions, defer payment of all or part of the current and accrued interest otherwise due on the Series 2017A Notes by extending the interest payment period for up to ten (10) consecutive years (each period, commencing on the date that the first such interest payment would otherwise have been made, an “Optional Deferral Period”). A deferral of interest payments may not extend beyond the Stated Maturity or end on a day other than an Interest Payment Date. As provided in the Indenture, Additional Interest on the Series 2017A Notes will accrue to the extent permitted by law. No interest shall be due and payable during an Optional Deferral Period, except at the end of such Optional Deferral Period or upon a redemption of the Series 2017A Notes during such Optional Deferral Period.

So long as no Event of Default shall have occurred and be continuing, prior to the termination of any Optional Deferral Period, the Company may further defer the payment of interest by extending such Optional Deferral Period; provided that such Optional Deferral Period together with all such previous and further deferrals of interest payments shall not exceed ten (10) consecutive years at any one time or extend beyond the Stated Maturity. Upon the termination of any Optional Deferral Period, which shall be an Interest Payment Date, the Company shall pay all interest accrued and unpaid on the Series 2017A Notes, including any Additional Interest, to the Person in whose name the Series 2017A Notes are registered on the Regular Record Date for such Interest Payment Date, provided that interest accrued and unpaid on the Series 2017A Notes, including any Additional Interest, payable at Stated Maturity or on any Redemption Date will be paid to the Person to whom principal is payable. Once the Company pays all interest accrued and unpaid on the Series 2017A Notes, including any Additional Interest, it shall be entitled again to defer interest payments on the Series 2017A Notes as described above.

During an Optional Deferral Period, subject to the next succeeding sentence, (a) the Company shall not declare or pay any dividend or make any distributions with respect to, or redeem, purchase, acquire or make a liquidation payment with respect to, any of its capital stock, and (b) the Company shall not make any payment of interest, principal or premium, if any, on or repay, repurchase or redeem any debt securities (including guarantees) issued by the Company which rank pari passu with or junior to the Series 2017A Notes. The preceding sentence, however, shall not restrict (i) any of the actions described in the preceding sentence resulting from any reclassification of the Company’s capital stock or the exchange or conversion of one class or series of the Company’s capital stock for another class or series of the Company’s capital stock, (ii) the purchase of fractional interests in shares of the Company’s capital stock pursuant to the conversion or exchange provisions of such capital stock or the security being converted or exchanged, (iii) dividends, payments or

distributions payable in shares of capital stock, (iv) redemptions, purchases or other acquisitions of shares of capital stock in connection with any employment contract, incentive plan, benefit plan or other similar arrangement of the Company or any of its subsidiaries or in connection with a dividend reinvestment or stock purchase plan, or (v) any declaration of a dividend in connection with implementation of any stockholders’ rights plan, or the issuance of rights, stock or other property under any such plan, or the redemption, repurchase or other acquisition of any such rights pursuant thereto.

The Company shall provide to the Trustee written notice of its selection or extension of an Optional Deferral Period at least 10 Business Days and not more than 60 Business Days prior to the earlier of (a) the next applicable Interest Payment Date or (b) the date, if any, upon which the Company is required to give notice of such Interest Payment Date or the Regular Record Date thereof to any applicable self-regulatory organization. The Trustee shall forward such notice promptly to the Holders of the Series 2017A Notes.

Payment of the principal of and interest (including Additional Interest) due at the Stated Maturity or earlier redemption of the Series 2017A Notes shall be made upon surrender of the Series 2017A Notes at the Corporate Trust Office of the Trustee. The principal of and interest on the Series 2017A Notes (including Additional Interest) shall be paid in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. Payment of interest (including interest on an Interest Payment Date)(including Additional Interest) will be made, subject to such surrender where applicable, at the option of the Company, (i) by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or (ii) by wire transfer or other electronic transfer at such place and to such account at a banking institution in the United States as may be designated in writing to the Trustee at least 16 days prior to the date for payment by the Person entitled thereto.

The indebtedness evidenced by this Note, including the principal hereof and interest hereon, is, to the extent provided in the Indenture, subordinate and junior in right of payment and upon liquidation to the prior payment in full of all Senior Indebtedness (as defined in the Indenture), and this Note is issued subject to the provisions of the Indenture with respect thereto. Each Holder of this Note, by accepting the same, (a) agrees to and shall be bound by such provisions, (b) authorizes and directs the Trustee on his behalf to take such action as may be necessary or appropriate to effectuate the subordination so provided, and (c) appoints the Trustee his attorney-in-fact for any and all such purposes. Each Holder hereof, by his acceptance hereof, waives all notice of the acceptance of the subordination provisions contained herein and in the Indenture by each holder of Senior Indebtedness, whether now outstanding or hereafter incurred, and waives reliance by each such holder upon said provisions.

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

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

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

Dated:

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

This Note is one of a duly authorized issue of Junior Subordinated Notes of the Company (the “Notes”), issued and issuable in one or more series under a Subordinated Note Indenture, dated as of October 1, 2015, as supplemented (the “Indenture”), between the Company and Wells Fargo Bank, National Association, Trustee (the “Trustee,” which term includes any successor trustee under the Indenture), to which Indenture and all indentures incidental thereto reference is hereby made for a statement of the respective rights, limitation of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Notes issued thereunder and of the terms upon which said Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof as Series 2017A 5.325% Junior Subordinated Notes due June 21, 2057 (the “Series 2017A Notes”) which is unlimited in principal amount. Capitalized terms used herein for which no definition is provided herein shall have the meanings set forth in the Indenture.

The Series 2017A Notes will not have a sinking fund.

At any time and from time to time on or after June 21, 2022, the Series 2017A Notes will be subject to redemption at the option of the Company in whole or in part upon not less than 30 nor more than 60 days’ notice, at a Redemption Price equal to 100% of the principal amount of the Series 2017A Notes being redeemed plus accrued and unpaid interest (including any Additional Interest) on the Series 2017A Notes being redeemed to the Redemption Date.

In addition, if a Tax Event shall occur and be continuing, the Company may redeem the Series 2017A Notes following the occurrence of that Tax Event, in whole, but not in part, before June 21, 2022, at a Redemption Price equal to 100% of the principal amount to be redeemed plus any accrued but unpaid interest (including any Additional Interest) to the Redemption Date.

“Administrative Action” means any judicial decision or any official administrative pronouncement, ruling, regulatory procedure, notice or announcement including any notice or announcement of intent to issue or adopt any administrative pronouncement, ruling, regulatory procedure or regulation.

“Tax Event” means that the Company shall have received an Opinion of Counsel experienced in such matters to the effect that, as a result of:

(a) any amendment to, clarification of, or change, including any announced prospective change, in the laws or treaties of the United States or any political subdivisions or taxing authorities, or any regulations under those laws or treaties;

(b) an Administrative Action;

(c) any amendment to, clarification of, or change in the official position or the interpretation of any Administrative Action or any interpretation or pronouncement that provides for a position with respect to an Administrative Action that differs from the previously generally accepted position, in each case by any legislative body, court, governmental authority or regulatory body, regardless of the time or manner in which that amendment, clarification or change is introduced or made known; or

(d) a threatened challenge asserted in writing in connection with an audit of the Company or an audit of any of the subsidiaries of the Company, or a publicly-known threatened challenge

asserted in writing against any other taxpayer that has raised capital through the issuance of securities that are substantially similar to the Series 2017A Notes, which amendment, clarification or change is effective or the Administrative Action is taken or issued, or interpretation or pronouncement is issued or threatened challenge is asserted or becomes publicly-known after the date of original issuance of the Series 2017A Notes, there is more than an insubstantial risk that interest payable by the Company on the Series 2017A Notes is not deductible, or within 90 days of the date of such opinion would not be deductible, in whole or in part, by the Company for United States federal income tax purposes.

In addition, if a Rating Agency Event shall occur and be continuing, the Company may redeem the Series 2017A Notes following the occurrence of that Rating Agency Event, in whole, but not in part, before June 21, 2022, at a Redemption Price equal to 102% of the principal amount to be redeemed plus any accrued but unpaid interest (including any Additional Interest) to the Redemption Date.

“Applicable Rating Agency” means any Rating Agency that (i)(a) published a rating for the Company on the date of initial issuance of the Series 2017A Notes and (b) publishes a rating for the Company at such time as a Rating Agency Event occurs, or (ii) any successor to a Rating Agency described in the preceding clause (i).

“Rating Agency” means any nationally recognized statistical rating organization (within the meaning of Section 3(a)(62) of the Securities Exchange Act of 1934, as amended).

“Rating Agency Event” means a change to the methodology or criteria that were employed by an Applicable Rating Agency for purposes of assigning equity credit to securities such as the Series 2017A Notes on the date of initial issuance of the Series 2017A Notes (the “current methodology”), which change either (i) shortens the period of time during which equity credit pertaining to the Series 2017A Notes would have been in effect had the current methodology not been changed by the Applicable Rating Agency, or (ii) reduces the amount of equity credit assigned to the Series 2017A Notes by the Applicable Rating Agency as compared with the amount of equity credit that such Rating Agency has assigned to the Series 2017A Notes as of the date of initial issuance of the Series 2017A Notes.

In the event of redemption of this Note in part only, a new Note or Notes of this series for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the surrender hereof. The Series 2017A Notes will not have a sinking fund.

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

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

the registration of transfer hereof or in exchange hereof or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

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

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

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

The Notes of this series are issuable only in registered form without coupons in denominations of $200,000 and integral multiples of $1,000 in excess thereof. As provided in the Indenture and subject to certain limitations therein set forth, Notes of this series are exchangeable for a like aggregate principal amount of Notes of this series of a different authorized denomination, as requested by the Holder surrendering the same upon surrender of the Note or Notes to be exchanged at the office or agency of the Company.

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

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

In connection with any transfer of any of the Series 2017A Notes evidenced by this certificate [prior to the expiration of the Distribution Compliance Period]¹, the undersigned confirms that such Series 2017A Notes are being:

CHECK ONE BOX BELOW

Unless one of the boxes is checked, the Trustee will refuse to register any of the Series 2017A Notes evidenced by this certificate in the name of any person other than the registered Holder thereof; provided, however, that if box (4) or (6) is checked, the Company may require, prior to registering any such transfer of the Series 2017A Notes, such legal opinions, certifications and other information as the Company has reasonably requested to confirm that such transfer is being made pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the 1933 Act, such as the exemption provided by Rule 144 under the 1933 Act; provided, further, that if box (3) is checked, the transferee must certify that it is a qualified institutional buyer as defined in Rule 144A.

Date: _____________________

_____________________________________________

Signature

_____________________________________________

Tax Identification Number

TO BE COMPLETED BY PURCHASER IF (3) ABOVE IS CHECKED.

The undersigned represents and warrants that it is purchasing this Series 2017A Note for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a “qualified institutional buyer” within the meaning of Rule 144A under the 1933 Act, and is aware that the sale to it is being made in reliance on Rule 144A and acknowledges that it has received such information regarding the Company as the undersigned has requested pursuant to Rule 144A or has determined not to request such information and that it is aware that the transferor is relying upon the undersigned’s foregoing representations in order to claim the exemption from registration provided by Rule 144A.

Date: _____________________

_______________________________

Signature

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