    <SEC-DOCUMENT>0001140361-23-018018-index.html : 20230412
    <SEC-HEADER>0001140361-23-018018.hdr.sgml : 20230412
    <ACCEPTANCE-DATETIME>20230412164744
    ACCESSION NUMBER:		0001140361-23-018018
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20230412
    DATE AS OF CHANGE:		20230412

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NISOURCE INC.
    		CENTRAL INDEX KEY:			0001111711
    		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
    		IRS NUMBER:				352108964
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-16189
    		FILM NUMBER:		23816183

    	BUSINESS ADDRESS:
    		STREET 1:		801 EAST 86TH AVE
    		CITY:			MERRILLVILLE
    		STATE:			IN
    		ZIP:			46410-6272
    		BUSINESS PHONE:		2196475200

    	MAIL ADDRESS:
    		STREET 1:		801 EAST 86TH AVE
    		CITY:			MERRILLVILLE
    		STATE:			IN
    		ZIP:			46410-6272

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	NISOURCE INC/DE
    		DATE OF NAME CHANGE:	20001103

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	NEW NISOURCE INC
    		DATE OF NAME CHANGE:	20000412
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>ny20006933x3_defa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: ny20006933x3_defa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>ny20006933x3_nc03.jpg
    <TEXT>
    Document 2 - file: ny20006933x3_nc03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>ny20006933x3_nc04.jpg
    <TEXT>
    Document 3 - file: ny20006933x3_nc04.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>