ALLIANT ENERGY Business Summary

Alliant Energy Corp (LNT) operates as a regulated public utility holding company, generating revenue primarily through the sale of electricity and natural gas to approximately 1.01 million electric and 435,000 natural gas customers in the Midwest. The company’s business model is structured around two primary segments, Electric and Gas, which are executed through its principal subsidiaries: Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL). Alliant’s strategy is driven by its "Clean Energy Blueprint," a multi-billion dollar capital expenditure plan focused on transitioning to renewable energy sources and modernizing grid infrastructure to accommodate rising demand from industrial sectors and data center expansions. Within the utility market, Alliant Energy competes directly with regional and national peers such as WEC Energy Group, Evergy (EVRG), Ameren (AEE), and American Electric Power (AEP), maintaining a competitive edge through its aggressive decarbonization targets and robust regulatory relationships in Iowa and Wisconsin. Formed in 1998 via the merger of IES Industries, WPL Holdings, and Interstate Power Company, Alliant Energy is currently led by President and CEO Lisa M. Barton, a veteran executive who previously served as COO of American Electric Power. The executive team includes Executive Vice President and CFO Robert J. Durian, who oversees the company’s financial strategy and capital allocation, and Senior Vice President and CIO Alberto Ruocco, who directs the firm’s technological and cybersecurity initiatives. The company’s governance is overseen by a board of directors chaired by Patrick E. Allen, which notably includes Manu Asthana—the former President and CEO of PJM Interconnection—who joined the board effective February 23, 2026. This leadership group is tasked with navigating the complex regulatory environment while executing a long-term growth strategy centered on sustainable energy and infrastructure resilience.