{"url_path":"/sec/nwe/8-k/2026-06-22/item-9-01","section_key":"item-9-01","section_title":"Item 9.01 Financial Statements and Exhibits.","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-06-22","source_url":"https://www.sec.gov/Archives/edgar/data/1993004/0001993004-26-000046-index.html","accession_number":"0001993004-26-000046","cik":"0001993004","ticker":"NWE","issuer_name":"NorthWestern Energy Group, Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1993004/0001993004-26-000046-index.html","primary_entity_key":"0001993004","primary_entity_name":"NorthWestern Energy Group, Inc."},"word_count":103,"has_tables":true,"body_markdown":"Item 9.01    Financial Statements and Exhibits.\n\nExhibit No.Description of Document\n\n[4.1](exhibit4123rdsuppindenture.htm)*\nTwenty-third Supplemental Indenture, dated as of June 1, 2026, between NorthWestern Energy Public Service Corporation and The Bank of New York Mellon, as trustee.\n\n104Cover Page Interactive Data File – the cover page XBRL tags are embedded within the Inline XBRL document\n\n* filed herewith\n\nSignatures\n\nPursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.\n\nNorthWestern Energy Group, Inc. \n\nBy:/s/ Timothy P. Olson\n\nTimothy P. Olson \n\nCorporate Secretary \n\nDate: June 22, 2026"}