-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 CvjJRFqLmy3WmfasJq6Z1niB3GtsvZDD6qfLM73YHoTeoUKStgOMQW0ZbqTXq0fn
 vxAuGKfE65oXmJqbkbRzdQ==

<SEC-DOCUMENT>0000787250-07-000015.txt : 20070405
<SEC-HEADER>0000787250-07-000015.hdr.sgml : 20070405
<ACCEPTANCE-DATETIME>20070405123402
ACCESSION NUMBER:		0000787250-07-000015
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070404
FILED AS OF DATE:		20070405
DATE AS OF CHANGE:		20070405

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BIGGS ROBERT D
		CENTRAL INDEX KEY:			0001255551

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09052
		FILM NUMBER:		07751200

	BUSINESS ADDRESS:	
		STREET 1:		4801 BONITA BAY BLVD
		STREET 2:		#1603
		CITY:			BONITA SPRINGS
		STATE:			FL
		ZIP:			34134
		BUSINESS PHONE:		2393909705

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DPL INC
		CENTRAL INDEX KEY:			0000787250
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				311163136
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1065 WOODMAN DRIVE
		CITY:			DAYTON
		STATE:			OH
		ZIP:			45432
		BUSINESS PHONE:		937 259 7142

	MAIL ADDRESS:	
		STREET 1:		1065 WOODMAN DRIVE
		CITY:			DAYTON
		STATE:			OH
		ZIP:			45432
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-04-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000787250</issuerCik>
        <issuerName>DPL INC</issuerName>
        <issuerTradingSymbol>DPL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001255551</rptOwnerCik>
            <rptOwnerName>BIGGS ROBERT D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O DPL INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1065 WOODMAN DRIVE</rptOwnerStreet2>
            <rptOwnerCity>DAYTON</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>45432</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>DPL Inc. Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2007-04-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>139300</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>31.3</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2685</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Douglas R. Hull by Power of Attorney</signatureName>
        <signatureDate>2007-04-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----