WEC Energy (WEC) 10-Q 2003 Q1 Quarterly report

Exhibit 99.1

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 Quarterly Report of Wisconsin Energy Corporation (the "Company") on Form 10-Q for the period ended March 31, 2003 as filed with the Securities and Exchange Commission on May 1, 2003 (the "Report"), I, Richard A. Abdoo, as 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/ Richard A. Abdoo      
Richard A. Abdoo
Chief Executive Officer
May 1, 2003

This certification accompanies this Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended. A signed original of this written statement required by Section 906 has been provided to Wisconsin Energy Corporation and will be retained by Wisconsin Energy Corporation and furnished to the Securities and Exchange Commission or its staff upon request.