Wisconsin Power and Light Company

Wisconsin Power and Light Company (WPL) is a public utility headquartered in Madison, Wisconsin, established in 1924 as part of Wisconsin Holdings. It operates as a wholly owned subsidiary of Alliant Energy Corporation (NASDAQ: LNT), a public utility holding company. Alliant Energy, its parent, reported approximately 2,948 employees as of early 2026 and generated $4 billion in operating revenues at year-end 2025, with a market capitalization of roughly $18.31 billion as of April 2026.

WPL is primarily engaged in the generation and distribution of electricity, and the distribution and transportation of natural gas to retail customers in southern and central Wisconsin. The company also sells electricity to wholesale customers within Wisconsin and is regulated by the Public Service Commission of Wisconsin. As part of Alliant Energy, WPL is contributing to the parent company's aspiration to achieve net-zero carbon emissions from utility operations by 2050 and eliminate all coal power plants from its fleet by 2040. WPL is also a part-owner of American Transmission Company (ATC).

Based on available patent litigation data, Wisconsin Power and Light Company is an operating company that defends against patent infringement claims. The company has been named as a defendant in one tracked case and has not initiated any patent suits as a plaintiff.

The single tracked case, Midwest Energy Emissions Corp. et al. v. Berkshire Hathaway Energy Company et al., lists Wisconsin Power and Light Company as a defendant. This case was filed in the Southern District of Iowa in July 2024. The involvement of other defendants, including Berkshire Hathaway Energy Company, suggests the litigation may pertain to technologies or practices common across the energy sector rather than a targeted assertion against WPL alone.