Shares didn’t rally. They scraped lower, the stock closed at $70.89 on July 30, down 1.6% that day, after slipping from $74.93 a week earlier.
The numbers themselves look tidy: revenue rose to $4.4B in 2025 (up +9.6% year over year), operating margin expanded to +23.5%, and net margin hit +18.6%. Management attributes some of that top-line lift to wholesale-market activity.
Management’s own filing points to higher volumes and prices in the regional grid as a driver of sales.
"Sales for resale bulk power and other revenues increased for the six months ended June 30, 2026 compared to the same period in 2025, primarily due to higher volumes and higher prices for electricity sold by IPL and WPL to MISO wholesale energy markets." (Alliant Energy / 10-Q 2026-07-31)
That lifted revenue and, on paper, helped margins. The catch: wholesale volumes and prices can vary quarter to quarter.
(Valuation snapshot)
After the wholesale bump, fuel costs crept up, and not all of the operational shifts were cost‑saving. Higher natural gas prices and changed dispatch patterns pushed electric production fuel costs higher in the most recent six months.
"Electric production fuel costs increased for the six months ended June 30, 2026 compared to the same period in 2025, primarily due to higher natural gas prices and higher natural gas volumes at WPL due to higher dispatch of natural gas-fired EGUs, partially offset by lower coal volumes at WPL due to lower dispatch of coal-fired EGUs and lower natural gas volumes at IPL due to lower dispatch of natural gas-fired EGUs." (Alliant Energy / 10-Q 2026-07-31)
So the same market forces that padded sales also raised fuel costs, higher dispatch of gas plants lifted volumes and revenue but added input cost pressure.
That dynamic matters given Alliant's valuation. Market cap is $18.3B, enterprise value $28.7B, and net debt is $10.4B. The stock trades at a P/E of 22.6x and an EV/sales of 6.6x, the latter a +32.6% premium to peers.
Alliant’s own scenario math lays out how outcomes move if revenue growth slows or accelerates: the company’s mechanical cases run a bull revenue CAGR of +5.0%, a base of +1.2%, and a bear of +0.5%, with the scenarios relying heavily on the exit multiple used. The company notes that the spread between bull and bear outcomes is largely driven by that exit multiple, meaning valuation choice, not just steady growth, swings final outcomes.
That’s the simple tension in the filing: tidy recent growth (revenue $4.4B, operating margin +23.5%) that leans on volatile wholesale volumes and commodity prices, set against a market that pays a premium (P/E 22.6x, EV/sales 6.6x). The figures and the filing leave the question visible rather than answered, how persistent are the wholesale-driven gains, and how will fuel-cost swings show up in coming results?
Figures and quotes from Alliant Energy filings (10‑Q and 10‑K).