Interstate Power and Light Company (IPL) is a public utility headquartered in Cedar Rapids, Iowa. It is a wholly-owned subsidiary of Alliant Energy Corporation, a publicly traded electric and gas utility holding company (NASDAQ: LNT) based in Madison, Wisconsin. Alliant Energy, as of July 2025, had a market capitalization of $16.5 billion. IPL itself reported 1,003 employees as of 2025.
IPL is primarily engaged in the generation and distribution of electricity and the distribution and transportation of natural gas in Iowa. It serves approximately 500,000 retail electric customers and 230,000 natural gas customers in Iowa. The company also provides electric utility services to wholesale customers in Minnesota, Illinois, and Iowa, and steam services to customers in Cedar Rapids, Iowa. IPL operates a diverse portfolio of electric generating facilities, including coal, natural gas, and renewable resources like wind.
Interstate Power and Light Company maintains an operating company posture in patent litigation. The company has been involved in one tracked case, appearing solely as a defendant. This indicates that IPL is an operating company defending against patent infringement claims, rather than an entity primarily asserting patents.
The sole tracked case involving Interstate Power and Light Company is Midwest Energy Emissions Corp. et al. v. Berkshire Hathaway Energy Company et al., filed in July 2024 in the Southern District of Iowa, where IPL is listed as a defendant. This case aligns with IPL's profile as a regional utility operating in Iowa.