200,000,000 Series 2012A 4.25% Senior Notes due March 15, 2042 MISSISSIPPI POWER COMPANY UNDERWRITING AGREEMENT

Exhibit 1.3

$200,000,000 Series 2012A 4.25% Senior Notes

due March 15, 2042

MISSISSIPPI POWER COMPANY

UNDERWRITING AGREEMENT

August 13, 2012

Barclays Capital Inc.

000 Xxxxxxx Xxxxxx

New York, New York 10019

X.X. Xxxxxx Securities LLC

000 Xxxxxxx Xxxxxx

New York, New York 10179

Mizuho Securities USA Inc.

000 Xxxx Xxxxxx

New York, New York 10022

as Representatives of the Several Underwriters named on Schedule I hereto

Ladies and Gentlemen:

Mississippi Power Company, a Mississippi corporation (the “Company”), confirms its agreement (the “Agreement”) with you and 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 $200,000,000 aggregate principal amount of the Series 2012A 4.25% Senior Notes due March 15, 2042 (the “Senior Notes”) as set forth in Schedule I hereto.

The Company understands that the Underwriters propose to make a public offering of the Senior Notes as soon as the Representatives deem advisable after this Agreement has been executed and delivered. The Senior Notes will be issued pursuant to an indenture, dated as of May 1, 1998 (the “Base Indenture”), by and between the Company and Xxxxx Fargo Bank, National Association, as successor trustee (the “Trustee”), as heretofore supplemented, including by a thirteenth supplemental indenture, dated as of March 9, 2012, to the Base Indenture relating to the Senior Notes (the “Supplemental Indenture” and, together with the Base Indenture and any other amendments or supplements thereto, the “Indenture”), between the Company and the Trustee.

SECTION 1. REPRESENTATIONS AND WARRANTIES.

The Company represents and warrants to the Underwriters as follows:

(a) A registration statement on Form S-3, as amended (File No. 333-161168), in respect of the Senior Notes and certain other securities has been prepared and filed in accordance with the provisions of the Securities Act of 1933, as amended (the “1933 Act”), with the Securities and Exchange Commission (the “Commission”); such registration statement and any post-effective amendment thereto, each in the form heretofore delivered or to be delivered to the Underwriters, has been declared effective by the Commission in such form (except that copies of the registration statement and any post-effective amendment delivered to the Underwriters need not include exhibits but shall include all documents incorporated by reference therein); and no stop order suspending the effectiveness of such registration statement has been issued and no proceeding for that purpose or pursuant to Section 8A of the 1933 Act against the Company or related to the offering has been initiated or, to the best knowledge of the Company, threatened by the Commission (any preliminary prospectus, as supplemented by a preliminary prospectus supplement, included in such registration statement or filed with the Commission pursuant to Rule 424(a) of the rules and regulations of the Commission under the 1933 Act, being hereinafter called a “Preliminary Prospectus”); such registration statement as used with respect to the Senior Notes, including the information deemed a part thereof pursuant to Rule 430B(f)(1) under the 1933 Act on the date of such registration statement’s effectiveness for purposes of Section 11 of the 1933 Act, as such Section applies to the Company and the Underwriters for the Senior Notes pursuant to Rule 430B(f)(2) under the 1933 Act (the “Effective Date”), including the exhibits thereto and all documents incorporated by reference therein pursuant to Item 12 of Form S-3 at the Effective Date, being hereinafter called the “Registration Statement”; the base prospectus relating to the Senior Notes and certain other securities of the Company, in the form in which it has most recently been filed with the Commission on or prior to the date of this Agreement relating to the Senior Notes, being hereinafter called the “Base Prospectus”; the Base Prospectus as amended and supplemented by a preliminary prospectus supplement dated August 13, 2012 relating to the Senior Notes which has been filed with the Commission pursuant to Rule 424(b) under the 1933 Act, as it may be further amended and supplemented immediately prior to the Applicable Time (as hereinafter defined) is hereinafter called the “Pricing Prospectus”; the Base Prospectus as amended or supplemented in final form, including by a prospectus supplement relating to the Senior Notes in the form in which it is filed with the Commission, pursuant to Rule 424(b) under the 1933 Act in accordance with Section 4(e) hereof is hereinafter called the “Final Supplemented Prospectus”; any reference herein to any Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus or the Final Supplemented Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the 1933 Act, as of the date of such Preliminary Prospectus, Base Prospectus, Pricing Prospectus or Final Supplemented Prospectus, as the case may be; any reference to any amendment or supplement to any Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus or the Final Supplemented Prospectus shall be deemed to refer to and include any documents filed after the date of such Preliminary Prospectus, Base Prospectus, Pricing Prospectus or Final Supplemented Prospectus, as the case may be, under the Securities Exchange Act of 1934, as amended (the “1934 Act”), and incorporated by reference in such Preliminary Prospectus, Base Prospectus, Pricing Prospectus or Final Supplemented Prospectus, as the case may be; any reference to any

amendment to the Registration Statement shall be deemed to refer to and include any annual report of the Company filed pursuant to Section 13(a) or 15(d) of the 1934 Act after the effective date of the Registration Statement that is incorporated by reference in the Registration Statement.

For purposes of this Agreement, the “Applicable Time” is 3:30 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.”

(b) 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 the 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 the light of the circumstances under which they were made, not misleading, except that the Company makes no warranty or representation to the Underwriters with respect to: (A) any statements or omissions made in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use in the Pricing Prospectus, any Permitted Free Writing Prospectus and the Final Supplemented Prospectus; or (B) any information set forth in the Pricing Prospectus or the Final Supplemented Prospectus under the caption “Description of the Series 2012A Senior Notes - Book-Entry Only Issuance - The Depository Trust Company.”

(c) 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 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 the light of the

circumstances under which they were made, not misleading in the case of the Pricing Disclosure Package and the Final Supplemented Prospectus as further supplemented; except that the Company makes no warranties or representations with respect to (A) that part of the Registration Statement which shall constitute the 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 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 caption “Description of the Series 2012A Senior Notes - Book-Entry Only Issuance - The Depository Trust Company.”

(d) 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 the light of the circumstances under which they were made, not misleading, except that the Company makes no warranty or representation to the Underwriters with respect to any statement or omissions made in a Permitted Free Writing Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives expressly for use therein.

(e) With respect to the Registration Statement, the conditions for use of Form S-3, as set forth in the General Instructions thereof, have been satisfied. At the determination date for purposes of the Senior Notes within the meaning of Rule 164(h) under the 1933 Act, the Company was not an “ineligible issuer” as defined in Rule 405 under the 1933 Act.

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

(g) The Company is a corporation duly organized and existing under the laws of the State of Mississippi, is duly qualified to carry on its business as a foreign corporation under the laws of the State of Alabama, and has due corporate authority to carry on the public utility business in which it is engaged and to own and operate the properties used by it in such business, to enter into and perform its obligations under this Agreement and the Indenture and to issue and sell the Senior Notes to the Underwriters.

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

(i) The Indenture has been duly authorized, executed and delivered by the Company, and, assuming due authorization, execution and delivery of the Indenture by the

Trustee, constitutes a valid and binding obligation of the Company, enforceable against the Company in accordance with its terms, except to the extent that enforcement thereof may be limited by (1) bankruptcy, insolvency, reorganization, receivership, liquidation, fraudulent conveyance, moratorium or other similar laws affecting creditors’ rights generally or (2) general principles of equity (regardless of whether enforcement is considered in a proceeding at law or in equity) (the “Enforceability Exceptions”); the Indenture conforms in all material respects to all statements relating thereto contained in the Pricing Disclosure Package and the Final Supplemented Prospectus; and the Indenture has been duly qualified under the 1939 Act.

(j) 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.

(k) The execution, delivery and performance by the Company of this Agreement, the Indenture and the Senior Notes and the consummation by the Company of the transactions contemplated herein and therein and compliance by the Company with its obligations hereunder and thereunder shall have been duly authorized by all necessary corporate action on the part of the Company and do not and will not result in any violation of the charter or bylaws of the Company, and do not and will not conflict with, or result in a breach of any of the terms or provisions of, or constitute a default under, or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company under (A) any contract, indenture, mortgage, loan agreement, note, lease or other agreement or instrument to which the Company is a party or by which it may be bound or to which any of its properties may be subject (except for conflicts, breaches or defaults which would not, individually or in the aggregate, be materially adverse to the Company or materially adverse to the transactions contemplated by this Agreement), or (B) any existing applicable law, rule, regulation, judgment, order or decree of any government, governmental instrumentality or court, domestic or foreign, or any regulatory body or administrative agency or other governmental body having jurisdiction over the Company or any of its properties.

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

(m) The financial statements incorporated by reference in the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, together with the related schedules and notes, present fairly, in all material respects, the financial position, results

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

SECTION 2. SALE AND DELIVERY TO THE UNDERWRITERS; CLOSING.

(a) On the basis of the representations and warranties herein contained and subject to the terms and conditions herein set forth, the Company agrees to sell to each Underwriter, severally and not jointly, and each Underwriter, severally and not jointly, agrees to purchase from the Company, the principal amount of the Senior Notes set forth in Schedule I to this Agreement opposite the name of such Underwriter (plus any additional amount of the Senior Notes that such Underwriter may become obligated to purchase pursuant to the provisions of Section 11 hereof), at a price equal to 103.951% of the principal amount thereof, plus accrued interest, from March 9, 2012 to the Closing Date.

(b) Payment of the purchase price and delivery of certificates for the Senior Notes shall be made at the offices of Southern Company Services, Inc., 30 Xxxx Xxxxx Xx. Boulevard, N.W., Atlanta, Georgia 30308, at 10:00 A.M., New York time, on August 21, 2012 (unless postponed in accordance with the provisions of Section 11 hereof) or such other time, place or date as shall be agreed upon by the Representatives and the Company (such time and date of payment and delivery being herein called the “Closing Date”). Payment shall be made to the Company by wire transfer in federal funds at the Closing Date against delivery of the Senior Notes to Barclays Capital Inc. on behalf of all of the Underwriters. It is understood that each Underwriter has authorized Barclays Capital Inc., for each Underwriter’s account, to accept delivery of, receipt for, and make payment of, the principal amount of the Senior Notes which each Underwriter has agreed to purchase. Barclays Capital 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 Senior Notes to be purchased by any Underwriter whose payment has not been received by the Closing Date, but such payment shall not relieve such Underwriter from its obligations hereunder.

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

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

SECTION 3. FREE WRITING PROSPECTUSES.

(a) The Company represents and agrees that, without the prior consent of the Representatives, it has not made and will not make any offer relating to the Senior Notes that would constitute a “free writing prospectus” as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus; each Underwriter, severally and not jointly, represents and agrees that, without the prior consent of the Company and the Representatives, it has not made and will not make any offer relating to the Senior Notes that would constitute a “free writing prospectus” as defined in Rule 405 under the 1933 Act, other than a Permitted Free Writing Prospectus or a free writing prospectus that is not required to be filed by the Company 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 Senior Notes (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 and the Representatives, is listed on Schedule II and herein called a “Permitted Free Writing Prospectus.”

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

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

(d) The Company agrees 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 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 by any Underwriter through the Representatives expressly for use therein.

(e) The Company agrees that if there occurs an event or development as a result of which the Pricing Disclosure Package would include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in light of the circumstances then prevailing, not misleading, the Company will notify the Representatives so that any use of the Pricing Disclosure Package may cease until it is amended or supplemented.

SECTION 4. COVENANTS OF THE COMPANY.

The Company covenants with the Underwriters as follows:

(a) The Company, on or prior to the Closing Date, will deliver to the Underwriters conformed copies of the Registration Statement as originally filed and of all amendments thereto, heretofore or hereafter made, including any post-effective amendment (in each case including all exhibits filed therewith, and including unsigned copies of each consent and certificate included therein or filed as an exhibit thereto, except exhibits incorporated by reference, unless specifically requested). As soon as the Company is advised thereof, it will advise the Representatives orally of the issuance of any stop order under the 1933 Act with respect to the Registration Statement, or the institution of any proceedings for that purpose or pursuant to Section 8A of the 1933 Act against the Company or related to the offering, of which the Company shall have received notice, and will use its best efforts to prevent the issuance of any such stop order and to secure the prompt removal thereof, if issued. The Company will deliver to the Representatives sufficient conformed copies of the Registration Statement, the Base Prospectus, the Pricing Prospectus and the Final Supplemented Prospectus and of all supplements and amendments thereto (in each case without exhibits) for distribution to the Underwriters and, from time to time, as many copies of the Base Prospectus, the Pricing Prospectus and the Final Supplemented Prospectus as the Underwriters may reasonably request for the purposes contemplated by the 1933 Act or the 1934 Act.

(b) The Company will furnish the Underwriters with written or electronic copies of each amendment and supplement to the Final Supplemented Prospectus relating to the offering of the Senior Notes in such quantities as the Underwriters may from time to time reasonably request. If, during the period (not exceeding nine months) when the delivery of a prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) shall be required by law in connection with the sale of any Senior Notes by an Underwriter, any event relating to or affecting the Company, or of which the Company shall be advised in writing by the Representatives, shall occur, which in the opinion of the Company or of Underwriters’ counsel should be set forth in a supplement to or an amendment of the Final Supplemented Prospectus, as the case may be, in order to make the Final Supplemented Prospectus not misleading in the light of the circumstances when it (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) is delivered, or if for any other reason it shall be necessary during such period to amend or supplement the Final Supplemented Prospectus or to file under the 1934 Act any document incorporated by reference in the Final Supplemented Prospectus in order to comply with the 1933 Act or the 1934 Act, the Company forthwith will (i) notify the Underwriters to suspend solicitation of purchases of the Senior Notes and (ii) at its expense, make any such filing or prepare and furnish to the Underwriters a reasonable number of copies of a supplement or supplements or an amendment or amendments to the Final Supplemented Prospectus which will supplement or amend the Final Supplemented Prospectus so that, as supplemented or amended, it will not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances when the Final Supplemented Prospectus (or in lieu thereof, the notice referred to in Rule 173(a) under the 1933 Act) is delivered, not misleading or which will effect any other necessary compliance. In case any Underwriter is required to deliver a prospectus in connection with the sale of any Senior Notes after the expiration of the period specified in the preceding sentence, the Company, upon

the request of such Underwriter, will furnish to such Underwriter, at the expense of such Underwriter, a reasonable quantity of a supplemented or amended prospectus, or supplements or amendments to the Final Supplemented Prospectus, complying with Section 10(a) of the 1933 Act. During the period specified in the second sentence of this subsection, the Company will continue to prepare and file with the Commission on a timely basis all documents or amendments required under the 1934 Act and the rules and regulations thereunder; provided that the Company shall not file such documents or amendments without also furnishing copies thereof prior to such filing to the Representatives and Hunton & Xxxxxxxx LLP.

(c) The Company will endeavor, in cooperation with the Underwriters, to qualify the Senior Notes for offering and sale under the applicable securities laws of such states and the other jurisdictions of the United States as the Representatives may designate; provided, however, that the Company shall not be obligated to qualify as a foreign corporation in any jurisdiction in which it is not so qualified or to file a consent to service of process or to file annual reports or to comply with any other requirements in connection with such qualification deemed by the Company to be unduly burdensome.

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

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

(f) During a period of 15 days from the date of this Agreement, the Company will not, without the Representatives’ prior written consent, directly or indirectly, sell, offer to sell, grant any option for the sale of, or otherwise dispose of, any Senior Notes or any security convertible into or exchangeable into or exercisable for the Senior Notes or any debt securities substantially similar to the Senior Notes (except for the Senior Notes issued pursuant to this Agreement). 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).

SECTION 5. PAYMENT OF EXPENSES.

The Company will pay all expenses incidental to the performance of its obligations under this Agreement, including but not limited to, the expenses of (i) the printing and filing of the Registration Statement as originally filed and of each amendment thereto, (ii) the preparation, issuance and delivery of the certificate(s) for the Senior Notes, (iii) the fees and disbursements of the Company’s counsel and accountants, (iv) the qualification of the Senior Notes under

securities laws in accordance with the provisions of Section 4(c) hereof, including filing fees and the reasonable fees and disbursements of Hunton & Xxxxxxxx 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 Senior Notes, (ix) any fees payable in connection with the rating of the Senior Notes, (x) the cost and charges of any transfer agent or registrar, and (xi) the cost of qualifying the Senior Notes with The Depository Trust Company.

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

SECTION 6. CONDITIONS OF UNDERWRITERS’ OBLIGATIONS.

The obligations of the Underwriters to purchase and pay for the Senior Notes are subject to the following conditions:

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

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

(1)	The opinion and related disclosure letter, each dated the Closing Date, of Xxxxx & Xxxxxxx LLP, general counsel for the Company, substantially in the forms attached hereto as Schedule III-A.

(2)	The opinion and related disclosure letter, each dated the Closing Date, of Xxxxxxxx Xxxxxxx LLP, counsel for the Company, substantially in the forms attached hereto as Schedule III-B.

(3)	The opinion, dated the Closing Date, of Xxxxx, Xxxxxx & Xxxxxx, LLP, counsel to the Trustee, substantially in the form attached hereto as Schedule IV.

(4)	The opinion and related disclosure letter, each dated the Closing Date, of Xxxxxx & Xxxxxxxx LLP, counsel for the Underwriters, substantially in the forms attached hereto as Schedule V.

(d) 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.

(e) The Representatives shall have received on the date hereof and shall receive on the Closing Date from Deloitte & Touche LLP, a letter or letters addressed to the Representatives (which may refer to letters previously delivered to the Representatives) dated the respective dates of delivery thereof to the effect that: (A) they are an independent registered public accounting firm with respect to the Company within the meaning of the 1933 Act and the rules and regulations under the 1933 Act; (B) in their opinion, the financial statements audited by them and incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, comply as to form in all material respects with the applicable accounting requirements of the 1934 Act and the rules and regulations under the 1934 Act; and (C) on the basis of certain limited procedures performed through a specified date not more than three business days prior to the date of such letter, namely (i) reading the minute books of the Company; (ii) performing the procedures specified by the standards of the Public Company Accounting Oversight Board (United States) for a review of interim financial statement information as described in PCAOB AU 722, “Interim Financial Information,” on the unaudited

financial statements, if any, of the Company incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, and on the latest available unaudited financial statements of the Company, if any, for any calendar quarter subsequent to the date of those incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable; and (iii) making inquiries of certain officials of the Company who have responsibility for financial and accounting matters regarding such unaudited financial statements or any specified unaudited amounts derived therefrom (it being understood that the foregoing procedures do not constitute an audit performed in accordance with generally accepted auditing standards and they would not necessarily reveal matters of significance with respect to the comments made in such letter, and accordingly that Deloitte & Touche LLP make no representations as to the sufficiency of such procedures for the Underwriters’ purposes), nothing came to their attention that caused them to believe that: (1) any material modifications should be made to the unaudited condensed financial statements, if any, incorporated by reference 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 After Dividends on Preferred Stock and the audited or unaudited Ratio of Earnings to Fixed Charges 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 for the same period included or incorporated by reference in the Registration Statement; (4) as of a specified date not more than three business days prior to the date of delivery of such letter, there has been any change in the capital stock or long-term debt of the Company or any decrease in net assets as compared with amounts shown in the latest unaudited balance sheet incorporated by reference in the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, except in each case for changes or decreases which (i) the Registration Statement and the Pricing Prospectus or the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus, as applicable, disclose have occurred or may occur, (ii) are occasioned by the declaration of dividends, (iii) are occasioned by draw-downs under existing pollution control financing arrangements, (iv) are occasioned by regularly scheduled payments of capitalized lease obligations, (v) are occasioned by the purchase or redemption of bonds or stock to satisfy mandatory or optional redemption provisions relating thereto, (vi) are occasioned by the reclassification of current maturities of long-term debt, or (vii) are disclosed in such letter; and (5) the unaudited amounts for Operating Revenues, Earnings Before Income Taxes and Net Income After Dividends on Preferred Stock and the unaudited Ratio of Earnings to Fixed Charges 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 for the same period or were not determined on a basis substantially consistent with that of the corresponding audited amounts or ratios 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.

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

(g) 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 & Xxxxxxxx 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 Senior Notes.

(h) The Company shall have performed its obligations when and as provided under this Agreement.

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

SECTION 7. CONDITIONS OF THE OBLIGATIONS OF THE COMPANY.

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

SECTION 8. INDEMNIFICATION.

(a) The Company agrees to indemnify and hold harmless each of the Underwriters and each person, if any, who controls any such Underwriter within the meaning of Section 15 of the 1933 Act or Section 20(a) of the 1934 Act, against any and all losses, claims, damages or liabilities, joint or several, to which they or any of them may become subject under the 1933 Act, the 1934 Act or otherwise, and to reimburse any such Underwriter and such controlling person or persons, if any, for any legal or other expenses incurred by them in connection with defending any actions, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in any Preliminary Prospectus, the Registration Statement, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus or the Final Supplemented Prospectus or, if the Company

shall furnish to the Underwriters any amendments or any supplements thereto, or shall make any filings pursuant to Section 13 or 14 of the 1934 Act which are incorporated therein by reference, in any Preliminary Prospectus, the Registration Statement, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus, the Final Supplemented Prospectus as so amended or supplemented, or in any free writing prospectus used by the Company other than a Permitted Free Writing Prospectus, or 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 Preliminary Prospectus, Registration Statement, Base Prospectus, Pricing Prospectus, Permitted Free Writing Prospectus or Final Supplemented Prospectus in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives for use therein. Each Underwriter agrees, within ten days after the receipt by it of notice of the commencement of any action in respect of which indemnity may be sought by it, or by any person controlling it, from the Company on account of its agreement contained in this Section 8, to notify the Company in writing of the commencement thereof but the omission of such Underwriter so to notify the Company of any such action shall not release the Company from any liability which it may have to such Underwriter or to such controlling person otherwise than on account of the indemnity agreement contained in this Section 8. In case any such action shall be brought against an Underwriter or any such person controlling such Underwriter and such Underwriter shall notify the Company of the commencement thereof as above provided, the Company shall be entitled to participate in (and, to the extent that it shall wish, including the selection of counsel, to direct) the defense thereof, at its own expense. In case the Company elects to direct such defense and select such counsel, any Underwriter or controlling person shall have the right to employ its own counsel, but, in any such case, the fees and expenses of such counsel shall be at the expense of such Underwriter or such controlling person unless the employment of such counsel has been authorized in writing by the Company in connection with defending such action. No indemnifying party shall, without the written consent of the indemnified party, effect the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim in respect of which indemnification may be sought hereunder (whether or not the indemnified party is an actual or potential party to such action or claim) unless such settlement, compromise or judgment (i) includes an unconditional release of the indemnified party from all liability arising out of such action or claim and (ii) does not include any statement as to, or an admission of, fault, culpability or a failure to act, by or on behalf of any indemnified party. In no event shall any indemnifying party have any liability or responsibility in respect of the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim effected without its prior written consent.

Each Underwriter, severally and not jointly, agrees to indemnify and hold harmless the Company, its directors and such of its officers who have signed the Registration Statement and each person, if any, who controls the Company within the meaning of Section 15 of the 1933 Act or Section 20(a) of the 1934 Act to the same extent and upon the same terms as the indemnity agreement of the Company set forth in Section 8(a) hereof, but only with respect to alleged untrue statements or omissions made in the Registration Statement, the Preliminary Prospectus, the Base Prospectus, the Pricing Prospectus, any Permitted Free Writing Prospectus or the Final

Supplemented Prospectus, or such documents as amended or supplemented, in reliance upon and in conformity with information furnished in writing to the Company by any Underwriter through the Representatives for use therein.

SECTION 9. REPRESENTATIONS, WARRANTIES AND AGREEMENTS TO SURVIVE DELIVERY.

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

SECTION 10. TERMINATION OF AGREEMENT.

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

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

SECTION 11. DEFAULT BY AN UNDERWRITER.

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

forth. If, however, the Representatives shall not have completed such arrangements within such 24-hour period, then:

(a) if the principal amount of Defaulted Securities does not exceed 10% of the Senior Notes, each of the non-defaulting Underwriters shall be obligated, severally and not jointly, to purchase the full amount thereof in the proportions that their respective underwriting obligations hereunder bear to the underwriting obligations of all non-defaulting Underwriters, or

(b) if the principal amount of Defaulted Securities exceeds 10% of the Senior Notes, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

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

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

SECTION 12. NOTICES.

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 Barclays Capital Inc., 000 Xxxxxxx Xxxxxx, Xxx Xxxx, Xxx Xxxx 00000, Attention: Syndicate Registration, Fax No. (000) 000-0000; X.X. Xxxxxx Securities LLC, 000 Xxxxxxx Xxxxxx, Xxx Xxxx, Xxx Xxxx 00000, Attention: High Grade Syndicate Desk, 3rd Floor, Fax No. (000) 000-0000; and Mizuho Securities USA Inc., 000 Xxxx Xxxxxx, 00xx Xxxxx, Xxx Xxxx, Xxx Xxxx 00000, Attention: Debt Capital Markets, Fax No. (000) 000-0000; notices to the Company shall be mailed to 0000 Xxxx Xxxxx Xxxxxxxxx, Xxxxxxxx, Xxxxxxxxxxx, 00000, Attention: Corporate Secretary, with a copy to Southern Company Services, Inc., 30 Xxxx Xxxxx Xx. Boulevard, N.W., Atlanta, Georgia 30308, Attention: Xxxx X. Xxxx.

SECTION 13. PARTIES.

This Agreement shall inure to the benefit of and be binding upon the Underwriters, the Company and their respective successors. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any person, firm or corporation, other than the Underwriters and the Company and their respective successors and the controlling persons and officers and directors referred to in Section 8 and their heirs and legal representatives, any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision herein contained. This Agreement and all conditions and provisions hereof are intended to be for the sole and exclusive benefit of the Underwriters and the Company and their respective successors, and said controlling persons and officers and directors and their heirs and legal representatives, and for the benefit of no other person, firm or corporation. No purchaser of Senior Notes from any of the Underwriters shall be deemed to be a successor by reason merely of such purchase.

The Company acknowledges and agrees that in connection with all aspects of each transaction contemplated by this Agreement, the Company and the Underwriters have arms-length business relationships that create no fiduciary duty on the part of any party and each expressly disclaims any fiduciary or financial advisory relationship.

SECTION 14. GOVERNING LAW AND TIME.

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. COUNTERPARTS.

This Agreement may be executed by any one or more of the parties hereto in any number of counterparts, each of which shall be deemed to be an original, but all such respective counterparts shall together constitute one and the same instrument.

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

Very truly yours,

MISSISSIPPI POWER COMPANY

By: /s/ Xxxxxxx X. Xxxx

Name: Xxxxxxx X. Xxxx

Title: Assistant Secretary

CONFIRMED AND ACCEPTED,

as of the date first above written

BARCLAYS CAPITAL INC.

By: /s/ Xxxxxx Xxxxx

Name: Xxxxxx Xxxxx

Title: Managing Director

X.X. XXXXXX SECURITIES LLC

By: /s/ Xxxxxx Xxxxxxxxx

Name: Xxxxxx Xxxxxxxxx

Title: Vice President

MIZUHO SECURITIES USA INC.

By: /s/ X. Xxxxx Xxxxxxxx

Name: X. Xxxxx Xxxxxxxx

Title: Managing Director

as Representatives of the several Underwriters named in Schedule I hereto

SCHEDULE I

Name of Underwriters	Principal Amount of Series 2012A Senior Notes
Barclays Capital Inc.	$ 50,000,000
X.X. Xxxxxx Securities LLC	50,000,000
Mizuho Securities USA Inc.	50,000,000
Scotia Capital (USA) Inc.	20,000,000
BNP Paribas Securities Corp.	10,000,000
Xxxxxx & Company	10,000,000
The Xxxxxxxx Capital Group, L.P.	10,000,000

TOTAL	$ 200,000,000

Schedule I-1

SCHEDULE II

PRICING DISCLOSURE PACKAGE

1)	Prospectus dated October 11, 2011

2)	Preliminary Prospectus Supplement dated August 13, 2012 (which shall be deemed to include documents incorporated by reference therein)

3)	Permitted Free Writing Prospectuses

Pricing Term Sheet

Schedule II-1

SCHEDULE III-A

[Letterhead of Xxxxx & Xxxxxxx LLP]

August 21, 2012

Barclays Capital Inc.

000 Xxxxxxx Xxxxxx

New York, New York 10019

X.X. Xxxxxx Securities LLC

000 Xxxxxxx Xxxxxx

New York, New York 10179

Mizuho Securities USA Inc.

000 Xxxx Xxxxxx

New York, New York 10022

as Representatives of the Several Underwriters

MISSISSIPPI POWER COMPANY

Series 2012A 4.25% Senior Notes

due March 15, 2042

Ladies and Gentlemen:

We have acted as general counsel to Mississippi Power Company (the “Company”) in connection with (i) the Company’s issuance of $200,000,000 aggregate principal amount of its Series 2012A 4.25% Senior Notes due March 15, 2042 (the “Notes”) pursuant to a Senior Note Indenture dated as of May 1, 1998, by and between the Company and Xxxxx Fargo Bank, National Association, as successor trustee (the “Trustee”), as heretofore supplemented, including by the Thirteenth Supplemental Indenture dated as of March 9, 2012 (collectively, the “Indenture”); and (ii) the purchase by the Underwriters (as defined herein) of the Notes pursuant to the terms of an Underwriting Agreement dated August 13, 2012 (the “Underwriting Agreement”), among the Company and the Underwriters named in Schedule I thereto (the “Underwriters”) for whom you are acting as representatives (the “Representatives”). This opinion is being delivered to you as Representatives pursuant to Section 6(c)(1) of the Underwriting Agreement.

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

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

Schedule III-A-1

a) The Company’s registration statement on Form S-3, as amended (File No. 333-161168), pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the “Act”), as it became effective under the Act (the “Registration Statement”);

b) The Company’s prospectus dated October 11, 2011 (the “Base Prospectus”), as supplemented by a preliminary prospectus supplement dated August 13, 2012 (together with the Pricing Exchange Act Documents (as hereinafter defined), the “Pricing Prospectus”), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the “Commission”) under the Act;

c) The documents incorporated by reference into the Registration Statement, the Pricing Prospectus and the Final Supplemented Prospectus (as hereinafter defined): the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2011, the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2012 and June 30, 2012 and the Current Reports on Form 8-K of the Company dated March 5, 2012, March 15, 2012, April 24, 2012 and May 16, 2012 (together, the “Pricing Exchange Act Documents”);

d) The Company’s prospectus supplement dated August 13, 2012 (together with the Base Prospectus, the “Final Supplemented Prospectus”), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated August 13, 2012 (the “Exchange Act Documents”), each as filed under the Securities Exchange Act of 1934, as amended (the “Exchange Act”);

e) An executed copy of the Indenture;

f) An executed copy of the Underwriting Agreement; and

g) The free writing prospectus prepared by the Company and filed with the Commission on August 13, 2012 pursuant to Rule 433 of the Act.

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 (other than those of the Company), (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.

We have also examined the opinion of Xxxxxxxx Xxxxxxx LLP to you of even date with respect to matters relating to the Act; the Exchange Act; and the Trust Indenture Act of 1939, as amended (the “Trust Indenture Act”), and to the applicable rules and regulations of the

Schedule III-A-2

Commission under said Acts and in expressing the opinions stated herein, with respect to such matters, we are relying on such opinion.

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:

1. The Company has been duly organized and is validly existing in good standing as a corporation under the laws of the State of Mississippi, is duly qualified to carry on its business as a foreign corporation under the laws of the State of Alabama and has due corporate authority to carry on the public utility business in which it is engaged, to own and operate the properties used by it in such business and to enter into and perform its obligations under the Agreements and the Notes.

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

3. All orders, consents or other authorizations or approvals of the Federal Energy Regulatory Commission and the Commission legally required for the issuance and sale of the Notes have been obtained; such orders are sufficient for the issuance and the sale of the Notes; the issuance and the sale of the Notes conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval of any Mississippi 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 Notes in accordance with the terms of the Underwriting Agreement.

4. The Indenture has been duly authorized, executed and delivered by the Company and, assuming the due authorization, execution and delivery thereof by the Trustee, constitutes a valid and legally binding instrument of the Company, enforceable against the Company in accordance with its terms, subject to the qualifications that the enforceability of the Company’s obligations under the Indenture may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors’ rights generally and by general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law).

5. The Notes have been duly authorized and executed by the Company and, when authenticated by the Trustee in the manner provided in the Indenture and delivered to and paid for by the Underwriters pursuant to the Underwriting Agreement, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, subject to the qualifications that the enforceability of the Company’s obligations under the Notes may be limited or otherwise affected by bankruptcy, insolvency, reorganization, moratorium and other similar laws relating to or affecting creditors’ rights generally and by

Schedule III-A-3

general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law).

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

7. The Indenture has been duly qualified under the Trust Indenture Act.

The attorneys in this firm that are rendering this opinion are members of the State Bar of Mississippi and we do not purport to express any opinion herein concerning any law other than the laws of the States of Alabama and Mississippi and, to the extent set forth herein, the laws of New York and the federal law of the United States. As to all matters governed by or dependent upon the federal law of the United States, we have, with your consent, relied upon the opinion of Xxxxxxxx Xxxxxxx LLP dated the date hereof and addressed to you, and as to all matters governed by or dependent upon the the law of the State of New York, we have, with your consent, relied upon the opinion of Xxxxxx & Xxxxxxxx LLP dated the date hereof and addressed to you.

This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent except that Xxxxxxxx Xxxxxxx LLP and Xxxxxx & Xxxxxxxx LLP may rely on this opinion in giving their opinions pursuant to the Underwriting Agreement, insofar as such opinions relate to matters of Mississippi and 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.

Yours very truly,

XXXXX & XXXXXXX LLP

Schedule III-A-4

[Letterhead of Xxxxx & Xxxxxxx LLP]

August 21, 2012

Barclays Capital Inc.

000 Xxxxxxx Xxxxxx

New York, New York 10019

X.X. Xxxxxx Securities LLC

000 Xxxxxxx Xxxxxx

New York, New York 10179

Mizuho Securities USA Inc.

000 Xxxx Xxxxxx

New York, New York 10022

as Representatives of the Several Underwriters

MISSISSIPPI POWER COMPANY

Series 2012A 4.25% Senior Notes

due March 15, 2042

Ladies and Gentlemen:

We have acted as general counsel to Mississippi Power Company (the “Company”) in connection with (i) the Company’s issuance of $200,000,000 aggregate principal amount of its Series 2012A 4.25% Senior Notes due March 15, 2042 (the “Notes”) pursuant to a Senior Note Indenture dated as of May 1, 1998, by and between the Company and Xxxxx Fargo Bank, National Association, as successor trustee (the “Trustee”), as heretofore supplemented, including by the Thirteenth Supplemental Indenture dated as of March 9, 2012 (collectively, the “Indenture”); and (ii) the purchase by the Underwriters (as defined herein) of the Notes pursuant to the terms of an Underwriting Agreement dated August 13, 2012 (the “Underwriting Agreement”) among the Company and the Underwriters named in Schedule I thereto (the “Underwriters”), for whom you are acting as representatives (the “Representatives”). This letter is being delivered to you as Representatives pursuant to Section 6(c)(1) of the Underwriting Agreement.

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

In connection with the foregoing, we have examined the Company’s registration statement on Form S-3, as amended (File No. 333-161168), pertaining to the Notes and certain other securities filed by the Company under the Securities Act of 1933, as amended (the “Act”), as it became effective under the Act (the “Registration Statement”); the Company’s prospectus dated October 11, 2011 (the “Base Prospectus”), as supplemented by a preliminary prospectus supplement dated August 13, 2012 (the “Pricing Prospectus”), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the

Schedule III-A-5

“Commission”) under the Act which, pursuant to Form S-3, incorporates by reference the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2011, the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2012 and June 30, 2012 and the Current Reports on Form 8-K of the Company dated March 5, 2012, March 15, 2012, April 24, 2012 and May 16, 2012 (together, the “Pricing Exchange Act Documents”), and a prospectus supplement dated August 13, 2012 (together with the Base Prospectus, the “Final Supplemented Prospectus”), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated August 13, 2012 (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 filed with the Commission on August 13, 2012 pursuant to Rule 433 of the Act. 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, its representatives, representatives of the independent public or certified public accountants of the Company, other counsel for the Company and your representatives and counsel at which the contents of the Registration Statement, the Pricing Disclosure Package and the Final Supplemented Prospectus and related matters were discussed and reviewed. Because of the inherent limitations in the independent verification of factual matters, and the character of the determinations involved in the preparation of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents, we are not passing upon and do not assume any responsibility for, and make no representation that we have independently verified, the accuracy, completeness or fairness of the statements contained therein (other than as specified in opinion paragraph 6 of our opinion to you related to the Indenture and the Notes dated of even date herewith). However, on the basis of the foregoing, we advise you that nothing has come to our attention which has caused us to believe that:

(i) 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,

(ii) the Pricing Disclosure Package, as of the Applicable Time, included an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading, or

(iii) 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 the light of the circumstances under which they were made, not misleading,

Schedule III-A-6

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 caption “Description of the Series 2012A Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company.”

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

Yours very truly,

XXXXX & XXXXXXX LLP

Schedule III-A-7

SCHEDULE III-B

[Letterhead of XXXXXXXX XXXXXXX LLP]

August 21, 2012

Barclays Capital Inc.

000 Xxxxxxx Xxxxxx

New York, New York 10019

X.X. Xxxxxx Securities LLC

000 Xxxxxxx Xxxxxx

New York, New York 10179

Mizuho Securities USA Inc.

000 Xxxx Xxxxxx

New York, New York 10022

as Representatives of the Several Underwriters

MISSISSIPPI POWER COMPANY

Series 2012A 4.25% Senior Notes

due March 15, 2042

Ladies and Gentlemen:

We have acted as counsel to Mississippi Power Company (the “Company”) in connection with (i) the Company’s issuance of $200,000,000 aggregate principal amount of its Series 2012A 4.25% Senior Notes due March 15, 2042 (the “Notes”) pursuant to a Senior Note Indenture dated as of May 1, 1998, by and between the Company and Xxxxx Fargo Bank, National Association, as successor trustee (the “Trustee”), as heretofore supplemented, including by the Thirteenth Supplemental Indenture dated as of March 9, 2012 (collectively, the “Indenture”); and (ii) the purchase by the Underwriters (as defined herein) of the Notes pursuant to the terms of an Underwriting Agreement dated August 13, 2012 (the “Underwriting Agreement”), among the Company and the Underwriters named in Schedule I thereto (the “Underwriters”) for whom you are acting as representatives (the “Representatives”). This opinion is being delivered to you as Representatives pursuant to Section 6(c)(2) of the Underwriting Agreement.

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

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

Schedule III-B-1

e) An executed copy of the Indenture;

f) An executed copy of the Underwriting Agreement; and

g) The free writing prospectus prepared by the Company and filed with the Commission on August 13, 2012 pursuant to Rule 433 of the Act.

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.

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

Schedule III-B-2

Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion that:

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

Schedule III-B-3

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

8. The statements set forth in the Pricing Disclosure Package and the Final Supplemented Prospectus under the heading “Material U.S. Federal Income Tax Considerations” insofar as they purport to constitute summaries of matters of United States federal income tax law constitute accurate summaries in all material respects subject to the qualifications set forth therein.

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 federal law of the United States and, to the extent set forth herein, the laws of the States of Alabama, Mississippi and New York. As to all matters governed by or dependent upon the laws of the States of Mississippi and Alabama, we have, with your consent, relied upon the opinion of Xxxxx & Xxxxxxx LLP dated the date hereof and addressed to you, and 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 Xxxxxx & Xxxxxxxx LLP dated the date hereof and addressed to you.

This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent except that Xxxxx & Xxxxxxx LLP may rely on this opinion in giving its opinion pursuant to the Underwriting Agreement, in so far as such opinion relates to matters of the federal law of the United States. 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.

Yours very truly,

XXXXXXXX XXXXXXX LLP

Schedule III-B-4

[Letterhead of XXXXXXXX XXXXXXX LLP]

August 21, 2012

Barclays Capital Inc.

000 Xxxxxxx Xxxxxx

New York, New York 10019

X.X. Xxxxxx Securities LLC

000 Xxxxxxx Xxxxxx

New York, New York 10179

Mizuho Securities USA Inc.

000 Xxxx Xxxxxx

New York, New York 10022

as Representatives of the Several Underwriters

MISSISSIPPI POWER COMPANY

Series 2012A 4.25% Senior Notes

due March 15, 2042

Ladies and Gentlemen:

We have acted as counsel to Mississippi Power Company (the “Company”) in connection with (i) the Company’s issuance of $200,000,000 aggregate principal amount of its Series 2012A 4.25% Senior Notes due March 15, 2042 (the “Notes”) pursuant to a Senior Note Indenture dated as of May 1, 1998, by and between the Company and Xxxxx Fargo Bank, National Association, as successor trustee (the “Trustee”), as heretofore supplemented, including by the Thirteenth Supplemental Indenture dated as of March 9, 2012 (collectively, the “Indenture”); and (ii) the purchase by the Underwriters (as defined herein) of the Notes pursuant to the terms of an Underwriting Agreement dated August 13, 2012 (the “Underwriting Agreement”), among the Company and the Underwriters named in Schedule I thereto (the “Underwriters”) for whom you are acting as representatives (the “Representatives”). This letter is being delivered to you as Representatives pursuant to Section 6(c)(1) of the Underwriting Agreement.

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

In connection with the foregoing, we have examined the Company’s registration statement on Form S-3, as amended (File No. 333-161168), pertaining to the Notes and certain

Schedule III-B-5

other securities filed by the Company under the Securities Act of 1933, as amended (the “Act”), as it became effective under the Act (the “Registration Statement”); the Company’s prospectus dated October 11, 2011 (the “Base Prospectus”), as supplemented by a preliminary prospectus supplement dated August 13, 2012 (the “Pricing Prospectus”), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Securities and Exchange Commission (the “Commission”) under the Act which, pursuant to Form S-3, incorporates by reference the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2011, the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2012 and June 30, 2012 and the Current Reports on Form 8-K of the Company dated March 5, 2012, March 15, 2012, April 24, 2012 and May 16, 2012 (together, the “Pricing Exchange Act Documents”), and a prospectus supplement dated August 13, 2012 (together with the Base Prospectus, the “Final Supplemented Prospectus”), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated August 13, 2012 (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 filed with the Commission on August 13, 2012 pursuant to Rule 433 of the Act. 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, its representatives, representatives of the independent public or certified public accountants of the Company, other counsel for the Company and your representatives and counsel at which the contents of the Registration Statement, the Pricing Disclosure Package and the Final Supplemented Prospectus and related matters were discussed and reviewed. Because of the inherent limitations in the independent verification of factual matters, and the character of the determinations involved in the preparation of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents, we are not passing upon and do not assume any responsibility for, and make no representation that we have independently verified, the accuracy, completeness or fairness of the statements contained therein (other than as specified in opinion paragraphs 6 and 8 of our opinion to you related to the Indenture and the Notes dated of even date herewith). However, on the basis of the foregoing, we advise you that nothing has come to our attention which has caused us to believe that:

(iii) 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

Schedule III-B-6

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 the light of the circumstances under which they were made, not misleading,

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 August 13, 2012, 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.

Yours very truly,

XXXXXXXX XXXXXXX LLP

Schedule III-B-7

SCHEDULE IV

[Letterhead of Xxxxx, Xxxxxx & Xxxxxx XXX]

August 21, 2012

Barclays Capital Inc.

000 Xxxxxxx Xxxxxx

New York, New York 10019

X.X. Xxxxxx Securities LLC

000 Xxxxxxx Xxxxxx

New York, New York 10179

Mizuho Securities USA Inc.

000 Xxxx Xxxxxx

New York, New York 10022

as Representatives of the Several Underwriters

Mississippi Power Company

0000 Xxxx Xxxxx

Gulfport, Mississippi 39501

Mississippi Power Company

Series 2012A 4.25% Senior Notes due March 15, 2042

Ladies and Gentlemen:

We have acted as counsel to Xxxxx Fargo Bank, National Association (“Xxxxx Fargo”), in connection with the issuance by Mississippi Power Company (the “Company”) of $200,000,000 aggregate principal amount of Series 2012A 4.25% Senior Notes due March 15, 2042 (the “Notes”). The Notes are being issued under the Senior Note Indenture dated as of May 1, 1998 (the “Original Indenture”) between the Company and Xxxxx Fargo, as trustee (in such capacity, the “Trustee”), as heretofore supplemented, including by the Thirteenth Supplemental Indenture dated as of March 9, 2012 (the “Supplemental Indenture” and, together with the Original Indenture, the “Indenture”) between the Company and the Trustee.

For purposes of this opinion, we have reviewed the Indenture and such other documents, records and papers, and satisfied ourselves as to such other matters, as we have deemed necessary or appropriate for this opinion. As to questions of fact material to this opinion, we have relied on certificates of Xxxxx Fargo 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.

Schedule IV-1

We have assumed that Xxxxx Fargo has been duly formed and that the Indenture has been duly authorized, executed and delivered by the Company and constitutes the valid and binding agreement of, and is enforceable in accordance with its terms against, the Company.

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

1) Based solely on a certificate from the Comptroller of the Currency, Xxxxx Fargo 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.

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

We are members of the Bar of the State of New York and, for purposes of this opinion, do not hold ourselves out as experts on the laws of any jurisdiction other than the State of New York and the federal law of the United States. The opinions expressed herein are limited to matters governed by the laws of the State of New York and the federal law of the United States.

This opinion is solely for your benefit in connection with the issuance and sale by the Company of the Notes and may not be relied upon by you for any other purpose, or relied upon or furnished to any other person, without our prior written consent.

Very truly yours,

Schedule IV-2

SCHEDULE V

[Letterhead of HUNTON & XXXXXXXX LLP]

August 21, 2012

Barclays Capital Inc.

000 Xxxxxxx Xxxxxx

New York, New York 10019

X.X. Xxxxxx Securities LLC

000 Xxxxxxx Xxxxxx

New York, New York 10179

Mizuho Securities USA Inc.

000 Xxxx Xxxxxx

New York, New York 10022

as Representatives of the Several Underwriters

MISSISSIPPI POWER COMPANY

Series 2012A 4.25% Senior Notes

due March 15, 2042

Ladies and Gentlemen:

We have acted as counsel to the Underwriters (as hereinafter defined) in connection with (i) the issuance and sale by Mississippi Power Company (the “Company”) of $200,000,000 aggregate principal amount of its Series 2012A 4.25% Senior Notes due March 15, 2042 (the “Notes”) pursuant to a Senior Note Indenture, dated as of May 1, 1998, by and between the Company and Xxxxx Fargo Bank, National Association, as successor trustee (the “Trustee”), as heretofore supplemented, including by the Thirteenth Supplemental Indenture, dated as of March 9, 2012 (collectively, the “Indenture”); and (ii) the purchase by the Underwriters of the Notes pursuant to the terms of an Underwriting Agreement dated August 13, 2012 (the “Underwriting Agreement”), among the Company and the Underwriters named in Schedule I thereto (the “Underwriters”) for whom you are acting as representatives (the “Representatives”). This opinion is being delivered to you as Representatives pursuant to Section 6(c)(4) of the Underwriting Agreement.

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

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

Schedule V-1

e) An executed copy of the Indenture;

f) An executed copy of the Underwriting Agreement; and

g) The free writing prospectus prepared by the Company and filed with the Commission on August 13, 2012 pursuant to Rule 433 of the Act.

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.

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:

Schedule V-2

to carry on the public utility business in which it is engaged, to own and operate the properties used by it in such business and to enter into and perform its obligations under the Agreements and the Notes.

3. All orders, consents or other authorizations or approvals of the Federal Energy Regulatory Commission and the Commission legally required for the issuance and sale of the Notes have been obtained; such orders are sufficient for the issuance and sale of the Notes; the issuance and sale of the Notes conform in all material respects with the terms of such orders; and no other order, consent or other authorization or approval of any Mississippi 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 Notes in accordance with the terms of the Underwriting Agreement.

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

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

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

We do not purport to express any opinion herein concerning any law other than the law of the State of New York and the federal law of the United States and, to the extent set forth herein, the laws of the States of Mississippi and Alabama. As to all matters governed by or dependent

Schedule V-3

upon the laws of the States of Mississippi and Alabama, we have, with your consent, relied upon the opinion of Xxxxx & Xxxxxxx LLP dated the date hereof and addressed to you.

This opinion letter is rendered by us only to you and is solely for your benefit in your capacity as Underwriters in connection with the Underwriting Agreement and the transactions contemplated thereunder and may not be used, quoted or relied upon by you for any other purpose or relied upon by or furnished to any other person without our prior written consent except that Xxxxx & Xxxxxxx LLP and Xxxxxxxx Xxxxxxx LLP may rely on this opinion 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 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,

Schedule V-4

[Letterhead of HUNTON & XXXXXXXX LLP]

August 21, 2012

Barclays Capital Inc.

000 Xxxxxxx Xxxxxx

New York, New York 10019

X.X. Xxxxxx Securities LLC

000 Xxxxxxx Xxxxxx

New York, New York 10179

Mizuho Securities USA Inc.

000 Xxxx Xxxxxx

New York, New York 10022

as Representatives of the Several Underwriters

MISSISSIPPI POWER COMPANY

Series 2012A 4.25% Senior Notes

due March 15, 2042

Ladies and Gentlemen:

We have acted as counsel to the Underwriters (as hereinafter defined) in connection with (i) the issuance and sale by Mississippi Power Company (the “Company”) of $200,000,000 aggregate principal amount of its Series 2012A 4.25% Senior Notes due March 15, 2042 (the “Notes”) pursuant to a Senior Note Indenture dated as of May 1, 1998, by and between the Company and Xxxxx Fargo Bank, National Association, as successor trustee (the “Trustee”), as heretofore supplemented, including by the Thirteenth Supplemental Indenture, dated as of March 9, 2012 (collectively, the “Indenture”); and (ii) the purchase by the Underwriters of the Notes pursuant to the terms of an Underwriting Agreement dated August 13, 2012 (the “Underwriting Agreement”), among the Company and the Underwriters named in Schedule I thereto (the “Underwriters”) for whom you are acting as representatives (the “Representatives”). This letter is being delivered to you as Representatives pursuant to Section 6(c)(4) of the Underwriting Agreement.

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

Schedule V-5

Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2011, the Quarterly Reports on Form 10-Q of the Company for the quarters ended March 31, 2012 and June 30, 2012 and the Current Reports on Form 8-K of the Company dated March 5, 2012, March 15, 2012, April 24, 2012 and May 16, 2012 (together, the “Pricing Exchange Act Documents”), and a prospectus supplement dated August 13, 2012 (together with the Base Prospectus, the “Final Supplemented Prospectus”), filed by the Company pursuant to Rule 424(b) of the rules and regulations of the Commission under the Act, which, pursuant to Form S-3, incorporates by reference the Pricing Exchange Act Documents and the Current Report on Form 8-K of the Company dated August 13, 2012 (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 filed with the Commission on August 13, 2012 pursuant to Rule 433 of the Act. 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, its counsel and representatives, representatives of the independent public or certified public accountants of the Company and with your representatives at which the contents of the Registration Statement, the Pricing Disclosure Package and the Final Supplemented Prospectus and related matters were discussed and reviewed. Because of the inherent limitations in the independent verification of factual matters, and the character of the determinations involved in the preparation of the Registration Statement, the Pricing Disclosure Package, the Final Supplemented Prospectus and the Exchange Act Documents, we are not passing upon and do not assume any responsibility for, and make no representation that we have independently verified, the accuracy, completeness or fairness of the statements contained therein (other than as specified in opinion paragraph 6 of our opinion to you related to the Indenture and the Notes dated of even date herewith). However, on the basis of the foregoing, we advise you that nothing has come to our attention which has caused us to believe that:

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

Schedule V-6

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 caption “Description of the Series 2012A Senior Notes ─ Book-Entry Only Issuance ─ The Depository Trust Company.”

Very truly yours,

Schedule V-7

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200,000,000 Series 2012A 4.25% Senior Notes due March 15, 2042 MISSISSIPPI POWER COMPANY UNDERWRITING AGREEMENT

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