Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in Registration Statement No. 333-260906 on Form S-8 of NiSource, Inc. of our report dated June 26, 2024, appearing in the Annual Report on Form 11-K of the NiSource Inc. Retirement Savings Plan for the year ended December 31, 2023.
/s/ McConnell & Jones LLP
Houston, Texas
June 26, 2024