{"schema":"rootz.ai/sec-company/v1","layer":1,"cik":"0000352541","name":"ALLIANT ENERGY CORP","summary":"Alliant Energy is a regulated investor-owned public utility holding company headquartered in Madison, Wisconsin. Through subsidiaries IPL and WPL, it provides electric and natural gas service to approximately 1,010,000 electric and 435,000 natural gas customers in Iowa and Wisconsin. Additional non-utility holdings include transmission interests, a non-utility wind farm, a natural gas facility, supply chain solutions via Travero, and development-ready industrial sites.","people":[],"products":[{"name":"Electric Distribution Service","type":"service","description":"Retail electric service provided by IPL in Iowa and WPL in Wisconsin to approximately 1,010,000 customers."},{"name":"Natural Gas Distribution Service","type":"service","description":"Retail natural gas distribution and transportation by IPL and WPL to approximately 435,000 customers in Iowa and Wisconsin."},{"name":"Electric Wholesale Sales","type":"service","description":"Wholesale electricity sales by IPL to customers in Illinois and Iowa, and by WPL to customers in Wisconsin."},{"name":"Steam Distribution","type":"service","description":"IPL previously generated and distributed steam to two customers in Cedar Rapids, Iowa; exited this business after December 31, 2025."},{"name":"Sheboygan Falls Energy Facility","type":"hardware","description":"347 MW simple-cycle natural gas-fired EGU near Sheboygan Falls, Wisconsin, leased to WPL through 2044."},{"name":"Non-utility Wind Farm","type":"hardware","description":"50% cash equity ownership interest in a 225 MW non-utility wind farm located in Oklahoma."},{"name":"Travero Supply Chain Solutions","type":"service","description":"Short-line rail freight, Mississippi River barge/rail/truck freight terminal, freight brokerage, and rail-served warehouse in Iowa and Illinois."},{"name":"Development-ready Sites","type":"service","description":"Rail-served and ready-to-build manufacturing and industrial sites throughout Alliant Energy's service territories."},{"name":"Administrative Services (Corporate Services)","type":"service","description":"Administrative services provided to Alliant Energy, IPL, WPL, and AEF."}],"partnerships":[{"partner_name":"ATC (American Transmission Co.)","partnership_type":"strategic","description":"ATC Holdings holds a 16% ownership interest in ATC, an independent for-profit transmission-only company.","start_date":null},{"partner_name":"ATC Holdco LLC","partnership_type":"strategic","description":"ATC Holdings holds a 20% ownership interest in ATC Holdco LLC, which holds an interest in Duke-American Transmission Company, LLC.","start_date":null},{"partner_name":"Duke-American Transmission Company, LLC","partnership_type":"strategic","description":"ATC Holdco LLC holds an interest in Duke-American Transmission Company, which holds a note receivable related to previously owned electric transmission infrastructure.","start_date":null},{"partner_name":"International Brotherhood of Electrical Workers Local 204","partnership_type":"strategic","description":"Collective bargaining agreement covering majority of IPL bargaining unit employees, expiring August 31, 2028.","start_date":null},{"partner_name":"International Brotherhood of Electrical Workers Local 965","partnership_type":"strategic","description":"Collective bargaining agreement covering all of WPL's bargaining unit employees, expiring May 31, 2026.","start_date":null}],"affiliations":[],"origin":{"leaf":"35ec42d4445692a41dc99a20eafe27123c493b8ad37259a0f60d707ffbb6459c","formula":"v2: sha256( sha256(content) || parent || source_accession )","content_sha256":"33c2422d1c99d3c5875edada1963e2a9e91f81120ece73f1682ac5fa0c480f9b","parent":"ee99efdb6ffd56b0c959e29de63eb1ed69c63cff2d4d8622c534cf4e40001b4e","source":"0000352541-26-000007","chain":"sec.gov/EDGAR (retrieved over TLS, accession recorded) > origin.rootz.global extraction > this response","registry":"origin.rootz.global","verify":"Recompute it: sha256(sha256(<this response body minus the origin block>) || parent || source_accession). 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