Attached files

file filename
EX-32.2 - EX-32.2 CERTIFICATION OF CRYSTAL D. LAIL PURSUANT TO SECTION 906 - NORTHWESTERN CORPex322certificationq12021.htm
EX-32.1 - EX-32.1 CERTIFICATION OF ROBERT C. ROWE PURSUANT TO SECTION 906 - NORTHWESTERN CORPex321certificationq12021.htm
EX-31.2 - EX-31.2 CERTIFICATION OF CHIEF FINANCIAL OFFICER - NORTHWESTERN CORPex312certificationq12021.htm
EX-31.1 - EX-31.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER - NORTHWESTERN CORPex311certificationq12021.htm
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