<SEC-DOCUMENT>0001209191-21-010770.txt : 20210216
<SEC-HEADER>0001209191-21-010770.hdr.sgml : 20210216
<ACCEPTANCE-DATETIME>20210216164023
ACCESSION NUMBER:		0001209191-21-010770
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210211
FILED AS OF DATE:		20210216
DATE AS OF CHANGE:		20210216

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Anderson Bryan D
		CENTRAL INDEX KEY:			0001831824

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-03526
		FILM NUMBER:		21639718

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

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SOUTHERN CO
		CENTRAL INDEX KEY:			0000092122
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				580690070
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		30 IVAN ALLEN JR. BLVD., N.W.
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30308
		BUSINESS PHONE:		4045065000

	MAIL ADDRESS:	
		STREET 1:		30 IVAN ALLEN JR. BLVD., N.W.
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30308
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
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            <rptOwnerZipCode>30308</rptOwnerZipCode>
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            <isTenPercentOwner>0</isTenPercentOwner>
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            <officerTitle>EVP &amp; Pres. External Affairs</officerTitle>
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        <derivativeTransaction>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>463</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
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                <transactionAcquiredDisposedCode>
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                <footnoteId id="F4"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Southern Company Common Stock</value>
                </underlyingSecurityTitle>
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                    <value>463</value>
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                <value>Southern Co Restricted Stock Units</value>
                <footnoteId id="F5"/>
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                    <value>621</value>
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    <footnotes>
        <footnote id="F1">Shares acquired upon vesting of second 1/3 of restricted stock units granted on February 11, 2019.  Includes 56 accrued dividend equivalent units.</footnote>
        <footnote id="F2">Shares withheld to satisfy  required state and federal tax withholding requirements.</footnote>
        <footnote id="F3">Shares acquired upon vesting of first 1/3 of restricted stock units granted on February 11, 2020.   Includes 20 accrued dividend equivalent units.</footnote>
        <footnote id="F4">Represents restricted stock units granted on February 11, 2020. The remaining award will vest 1/3 in 2022 and 1/3 in 2023. Each restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.</footnote>
        <footnote id="F5">Represents restricted stock units granted on February 11, 2019. The remaining 1/3 of the award will vest in 2022. Each restricted stock unit represents the right to receive, at statement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Marcia R. DeMar, Attorney-in-Fact for Bryan D. Anderson</signatureName>
        <signatureDate>2021-02-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
