Wisconsin Public Service (WSPBP) 10-K 2021 FY Annual report

Exhibit 32.1

Certification Pursuant to

18 U.S.C. Section 1350,

As Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of Wisconsin Public Service Corporation (the "Company") on Form 10-K for the period ended December 31, 2021, as filed with the Securities and Exchange Commission on February 24, 2022 (the "Report"), I, Scott J. Lauber, Chairman of the Board, President and Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ SCOTT J. LAUBER

Scott J. Lauber
Chairman of the Board, President and Chief Executive Officer

February 24, 2022