Alliant Energy Corporation

The filings describe a regulated utility growing its rate base, and the strongest evidence is in the annual figures. Operating income reached $1.02 billion in 2025, against $886 million in 2024, a rise of roughly 15%, on revenue that rose about 9.5%. Those gains rest on regulatory decisions readers can trace in the text, including the December 2025 PSCW order authorizing a $69 million annual base rate increase for WPL's retail electric customers for the 2026 test period. Wisconsin's 2025 Act 193 also applies to fuel cost plans filed on or after January 1, 2027, and changes how capacity costs and revenues are treated. Readers may want to look at how the IPL wind and gas filings and the WPL Sheboygan Falls lease through 2044 fit into future rate base. MD&A also flags an EPA proposal to significantly narrow the CCR Rule, expected to be finalized by the end of 2026, which the company says it cannot predict with certainty. The data provided contains no Beneish M-Score, Piotroski F-Score, Altman Z-Score, or Fog Index values, so this synthesis does not characterize any forensic score. Its conclusions rest on reported revenue, operating income, quarterly variances, and the narrative text. Several items deserve a closer read: the WPL union contract expires May 31, 2026; IPL exited its steam business after 2025; and in the quarter retail electric volumes fell 1% and retail gas volumes fell 6%, mainly because of temperatures.

Catalyst.Alliant Energy's regulated utilities are growing their rate base. In March 2026 the Iowa Utilities Commission approved advance rate-making principles for up to 1,000 MW of new IPL wind generation, with a fixed cost cap of $3,020 per kilowatt. In April 2026 IPL filed for an approximately 720 MW simple-cycle gas unit in Linn County, Iowa, with a decision expected in the first quarter of 2027. Demand is also rising: IPL signed an electric service agreement with a customer who expects to build a data center, with contracted peak demand of approximately 370 MW. MD&A says this agreement is not expected to produce immediate load increases. Full-year 2025 revenue was $4.36 billion, up from $3.98 billion in 2024.

Hidden risk.The headline quarter flatters the core utility picture. Consolidated Q1 2026 net income rose $11 million to $224 million, but Utilities and Corporate Services fell $10 million to $215 million. The $20 million improvement at Non-utility and Parent was driven primarily by a state income tax apportionment benefit. Interest expense rose $23 million in the quarter, mainly from financings completed in 2025. Estimated temperature impacts reduced electric operating income by $10 million, compared with $6 million a year earlier. The wind, gas, and data-center plans also depend on regulatory approvals and on a CCR rule the company says it cannot yet predict.