{"url_path":"/sec/cik-0000072909/8-k/2026-06-10/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":"2026-06-10","source_url":"https://www.sec.gov/Archives/edgar/data/72909/0001193125-26-265885-index.html","accession_number":"0001193125-26-265885","cik":"0000072909","ticker":null,"issuer_name":"NORTHERN STATES POWER CO /WI/","edgar_url":"https://www.sec.gov/Archives/edgar/data/72909/0001193125-26-265885-index.html","primary_entity_key":"0000072909","primary_entity_name":"NORTHERN STATES POWER CO /WI/"},"word_count":133,"has_tables":true,"body_markdown":"Item 9.01.\n\nFinancial Statements and Exhibits.\n\n \n\n \n(d)\n\nExhibits.\n\n \n\nExhibit\n\n  \n\nDescription\n\n1.01\n  \n[Bond Purchase Agreement, dated June 9, 2026, among Northern States Power Company and the several purchasers listed in Schedule B thereto](d165471dex101.htm)\n\n4.01\n  \n[Supplemental Indenture dated as of June 9, 2026 between Northern States Power Company and U.S. Bank Trust Company, National Association, as successor Trustee, creating 5.48% First Mortgage Bonds, Series due June 15, 2041](d165471dex401.htm)\n\n104\n  \nCover Page Interactive Data File (embedded within the Inline XBRL document)\n\n \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\n \n\nNORTHERN STATES POWER COMPANY\n\n(a Wisconsin corporation)\n\nBy:\n \n\n/s/ Todd A. Wehner\n\nName:\n \nTodd A. Wehner\n\nTitle:\n \nVice President, Treasurer\n\nDate: June 10, 2026"}