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EXHIBIT 32.3

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 quarterly report on Form 10-Q of Madison Gas and Electric Company (the

"Company"), for the period ended March 31, 2021, as filed with the Securities and Exchange

Commission on the date hereof ("the Report"), I, Jeffrey M. Keebler, Chief Executive Officer of the

Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the

Sarbanes-Oxley Act of 2002, 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/ Jeffrey M. Keebler

Jeffrey M. Keebler

Chairman, President and Chief Executive Officer

Date: May 6, 2021