SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

Exhibit 10(a)6

THE SOUTHERN COMPANY

SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

Amended and Restated Effective January 1, 2009

THE SOUTHERN COMPANY

SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

ARTICLE I - PURPOSE AND ADOPTION OF PLAN

1.1        Adoption : The Southern Company Supplemental Executive Retirement Plan, effective as of January 1, 2009 and hereinafter set forth (the “Plan”), is a modification and continuation of The Southern Company Supplemental Executive Retirement Plan which originally became effective January 1, 1997, and was last amended and restated effective January 1, 2005. This amendment and restatement and the January 1, 2005 amendment and restatement are intended to bring the Plan into compliance with Code Section 409A. The Plan should be construed to satisfy this intent. The Plan shall be an unfunded deferred compensation arrangement as contemplated by the Employee Retirement Income Security Act, as amended, under which benefits shall be paid solely from the general assets of the Company. At a time and in a manner determined by the Administrative Committee, Participants shall make timely elections to conform to the Plan’s terms effective as of the January 1, 2005 amendment and restatement. Such elections are intended to meet the transition requirements of Code Section 409A, including proposed, temporary, or final regulations, or other guidance issued by the Secretary of Treasury and the Internal Revenue Service with respect thereto (collectively “409A Guidance”).

1.2        Purpose : The Plan provides deferred compensation primarily to a select group of management or highly compensated employees to supplement such employees’ accrued benefits under The Southern Company Pension Plan (“Pension Plan”). The supplement under this Plan is generally intended to make up the difference, if any, between each such employee’s actual accrued benefit under the Pension Plan and the benefit he would have accrued under such plan if certain incentive pay were included in Earnings when determining Average Monthly Earnings for all methods of calculating Retirement Income under the Pension Plan.

ARTICLE II - DEFINITIONS

2.1       “Actuarial Basis” shall mean an actuarial adjustment to SERP Benefits that must be made as required by Code Section 409A when there is a change made by a Participant to a previously elected or deemed-elected form of payment paid over a lifetime. Reasonable actuarial assumptions to make such adjustment shall be established in writing from time to time by the Administrative Committee.

2.2       “Administrative Committee” shall mean the committee referred to in Section 3.1 hereof.

2.3       “Affiliated Employer” shall mean any corporation which is a member of the controlled group of corporations of which Southern Company is the common parent corporation which the Board of Directors may from time to time determine to bring under the Plan and which shall adopt the Plan, and any successor of any of them. The Affiliated Employers are set forth in

Appendix A to the Plan, as amended from time to time.

2.5       “Change in Control Benefits Protection Plan” shall mean the Change in Control Benefits Protection Plan, as approved by the Southern Board, as it may be amended from time to time in accordance with the provisions therein.

2.6       “Code” shall mean the Internal Revenue Code of 1986, as amended from time to time.

2.8       “Designated Beneficiary” shall have the same meaning and shall be the same person(s) or entity(ies) designated by the Participant under The Southern Company Supplemental Benefit Plan with respect to the Pension Benefit provided thereunder.

2.9       “Discount Rate” shall mean the thirty (30) year Treasury yield as published by the Department of Treasury for purposes of compliance with Code Section 417(e) determined for September of the calendar year prior to the calendar year in which a Participant Separates from Service provided that the maximum rate shall not exceed six percent (6%).

2.10     “Earnings” shall mean the total accumulated interest on a Participant’s Single-Sum Amount. Unless otherwise stated, Earnings accrue from the date as of which a Participant’s first installment is payable (ignoring for this purpose any Key-Employee Delay) until all of the Participant’s Single-Sum Amount (and monthly interest accretion thereon) has been paid. Interest shall compound monthly based on the rate of interest accretion for each month and the unpaid portion of a Participant’s Single-Sum Amount (including any unpaid portion of any prior month’s interest accretion). The rate of such interest accretion for a month shall be the monthly equivalent of the per annum prime rate of interest published in the Wall Street Journal as the base rate on the corporate loans posted as of the last business day of each month by at least seventy-five percent (75%) of the United States largest banks as of the last business day of the month (or such other day of a month as the Administrative Committee may determine).

2.12     “Employee” shall mean any person who is employed by an Affiliated Employer excluding any persons represented by a collective bargaining agent.

2.13     “Expected Average Lifetime” shall mean the life expectancy of a Participant in months using the Table of Unisex Mortality Rates promulgated by the Internal Revenue Service for use to determine lump-sum payments from qualified pension plans in accordance with Code Section 417(e) as of the 2007 calendar year.

2.14     “Incentive Pay” shall mean all awards earned while an Employee under any annual group incentive plans, as defined in Section 5.1 of the Pension Plan, provided such incentive award was earned on or after January 1, 1994. Alternatively, if it produces a greater

benefit to the Participant, Incentive Pay shall mean all awards paid or that would have been paid but for an election to defer such incentive award under The Southern Company Deferred Compensation Plan, under any annual group incentive plan, as defined in Section 5.1 of the Pension Plan, provided such incentive award was paid or deferred on or after January 1, 1995. If a person was formerly represented by a collective bargaining agent with respect to any corporation which is a member of the controlled group of corporations of which Southern Company is the common parent and such person subsequently becomes an Employee, incentive awards described in the preceding sentence shall include awards earned on and after January 1, 1994 while represented by such collective bargaining agent.

2.15     “Key Employee” shall have the meaning ascribed to the term “specified employee” under Code Section 409A(a)(2)(B)(i) and the regulations promulgated thereunder as it applies to a Participant. The Administrative Committee shall establish the time period required to determine key-employee status.

2.16     “Key-Employee Delay” shall mean the six (6) month delay in the commencement of benefits applicable to Key Employees pursuant to the requirements of Code Section 409A(a)(2)(B)(i) and the regulations promulgated thereunder.

2.17     “Participant” shall mean an Employee or former Employee of an Affiliated Employer who is eligible and participates in the Plan pursuant to Sections 4.1 and 4.2.

2.18     “Pension Plan” shall mean The Southern Company Pension Plan, as amended from time to time.

2.19     “Plan” shall mean The Southern Company Supplemental Executive Retirement Plan, as amended and restated as of January 1, 2009 and as may be amended from time to time thereafter.

2.21     “Provisional Payee” shall have the same meaning ascribed to this term in the Pension Plan.

2.22     “Separation from Service” shall have the meaning ascribed to this term under Code Section 409A(a)(2)(A)(i) and the regulations promulgated thereunder. For this purpose, Separation from Service shall include a permanent decrease in the level of bona fide services performed by the Participant after a certain date to a level that is twenty percent (20%) or less of the average level of bona fide services performed by the Participant over the immediately preceding thirty-six (36) month period.

2.24     “Single-Sum Amount” shall mean the discounted value of the SERP Benefit based on a single life annuity form of benefit payable for an Expected Average Lifetime calculated using the Discount Rate. This Single-Sum Amount calculation shall be determined effective as of the first installment to be made under Section 5.2 (ignoring for this purposes any

Key-Employee Delay) taking into account the following: (a) reductions for charges related to any Qualified Pre-retirement Survivor Annuity form of benefit under the Pension Plan shall not apply; and (b) the SERP Benefit and Expected Average Lifetime shall be based on the Participant’s age as of such first installment date.

2.26     “Supplemental Benefit Plan” shall mean The Southern Company Supplemental Benefit Plan, as amended from time to time.

2.27     “Supplemental Pension Benefit” shall mean the “Pension Benefit”, if any, that is payable to a Participant under the Supplemental Benefit Plan.

Where the context requires, the definitions of all terms set forth in the Pension Plan shall apply with equal force and effect for purposes of interpretation and administration of the Plan, unless said terms are otherwise specifically defined in the Plan. The masculine pronoun shall be construed to include the feminine pronoun and the singular shall include the plural, where the context so requires.

ARTICLE III - ADMINISTRATION OF PLAN

3.1        Administrator . Effective May 31, 2007, the general administration of the Plan shall be placed in the “Committee” which shall consist of the Benefits Administration Committee, the members of which shall be appointed from time to time by the Fiduciary Oversight Committee of the Board of Directors. The Committee shall govern itself in accordance with the terms of the Charter for the Benefits Administration Committee approved by the Fiduciary Oversight Committee of the Board of Directors.

(a)          The Administrative Committee shall administer the Plan in accordance with its terms and shall have all powers necessary to carry out the provisions of the Plan more particularly set forth herein. It shall have the discretion to interpret the Plan and shall determine all questions arising in the administration, interpretation, and application of the Plan. Any such determination by it shall be conclusive and binding on all persons. The Administrative Committee shall be the agent for the service of process.

(b)          If a claim for benefits under the Plan is denied, in whole or in part, the Administrative Committee will provide a written notice of the denial within a reasonable period of time, but not later than 90 days after the claim is received. If special circumstances require more time to process the claim, the Administrative Committee will issue a written explanation of the special circumstances prior to the end of the 90-day period and a decision will be made as soon as possible, but not later than 180 days after the claim is received.

Upon request, a Participant or his or her Designated Beneficiary will be provided without charge, reasonable access to, and copies of, all non-confidential documents that are relevant to any denial of benefits. A claimant has 60 days from the day he or she receives the original denial to request a review. Such request must be made in writing and sent to the Administrative Committee. The request should state the reasons why the claim should be reviewed and may also include evidence or documentation to support the claimant’s position.

The Administrative Committee will reconsider the claimant’s claim, taking into account all evidence, documentation, and other information related to the claim and submitted on the claimant’s behalf, regardless of whether such information was submitted or considered in the initial denial of the claim. The Administrative Committee will make a decision within 60 days. If special circumstances require more time for this process, the claimant will receive written explanation of the special circumstances prior to the end of the initial 60-day period and a decision will be sent as soon as possible, but not later than 120 days after the Administrative Committee receives the request.

No legal action to receiver benefits or enforce or clarify rights under a Plan can be commenced until the Participant or his or her Designated Beneficiary has first exhausted the claims and review procedures provided under the Plan.

(c)          The Administrative Committee may adopt such regulations as it deems desirable for the conduct of its affairs. It may appoint such accountants, counsel, actuaries, specialists, and other persons as it deems necessary or desirable in connection with the administration of this Plan.

3.3        Duties of the Administrative Committee .

(a)         The Administrative Committee is responsible for the daily administration of the Plan. It may appoint other persons or entities to perform any of its fiduciary functions. The Administrative Committee and any such appointee may employ advisors and other persons necessary or convenient to help it carry out its duties, including its fiduciary duties. The Administrative Committee shall have the right to remove any such appointee from his position. Any person, group of persons, or entity may serve in more than one fiduciary capacity.

(b)        The Administrative Committee shall maintain accurate and detailed records and accounts of Participants and of their rights under the Plan and of all receipts, disbursements, transfers, and other transactions concerning the Plan. Such accounts, books, and records relating thereto shall be open at all reasonable times to inspection and audit by persons designated by the Administrative Committee.

(c)         The Administrative Committee shall take all steps necessary to ensure that the Plan complies with the law at all times. These steps shall include such items as the preparation and filing of all documents and forms required by any governmental agency; maintaining of adequate Participants’ records; recording and transmission of all notices required to be given to Participants and their Designated Beneficiaries; the receipt and dissemination, if required, of all reports and information received from an Affiliated Employer; securing of such fidelity bonds as may be required by law; and doing such other acts necessary for the proper administration of the Plan. The Administrative Committee shall keep a record of all of its proceedings and acts, and shall keep all such books of account, records, and other data as may be necessary for proper administration of the Plan.

3.4        Indemnification . The Affiliated Employers shall indemnify the Administrative Committee against any and all claims, losses, damages, expenses, and liability arising from an action or failure to act, except when the same is finally judicially determined to be due to gross negligence or willful misconduct. The Affiliated Employers may purchase at its own expense sufficient liability insurance for the Administrative Committee to cover any and all claims, losses, damages, and expenses arising from any action or failure to act in connection with the execution of the duties as Administrative Committee. No member of the Administrative Committee who is also an Employee of an Affiliated Employer shall receive any compensation from the Plan for his services in administering the Plan.

ARTICLE IV - ELIGIBILITY

4.1        Eligibility Requirements . All Employees who are determined to be eligible to participate in the Plan in accordance with Section 4.2 shall be eligible to receive benefits under the Plan provided such Employees are (a) participating in the Plan at the time they terminate from an Affiliated Employer and are retirement eligible or (b) die while in active service while with an Affiliated Employer provided each such Employee’s spouse is eligible to receive a survivor benefit under Article VII of the Pension Plan at such eligible Employee’s death.

4.2        Determination of Eligibility . The Adminis