Alliant Energy (STU:AY1) Interest Expense: €-437 Mil (TTM As of Mar. 2026)

Author: Vera Yuan Vera Yuan
Vera Yuan
Vera Yuan
Director of Data and Quant Analytics at GuruFocus
Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Reviewed by: Charlie Tian Charlie Tian
Charlie Tian
Charlie Tian
Founder & CEO of GuruFocus
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.

STU:AY1 Alliant Energy Corp STU:AY1
78 GF Score
Price €65.30
GF Value €57.43
Valuation Modestly Overvalued
! 10 Warning Signs
View Full Analysis

What is Alliant Energy Interest Expense?

Alliant Energy STU:AY1 -1.28% 78 Interest Expense is €-437 Mil as of Mar. 2026. GuruFocus rates STU:AY1 with a GF Score™ of 78/100 and a GF Value™ of €57.43 (Modestly Overvalued). The stock has 10 warning signs investors should review.

Interest Expense is the amount reported by a company or individual as an expense for borrowed money. Alliant Energy's interest expense for the three months ended in Mar. 2026 was € -123 Mil. Its interest expense for the trailing twelve months (TTM) ended in Mar. 2026 was €-437 Mil.

Interest Coverage is a ratio that determines how easily a company can pay interest expenses on outstanding debt. It is calculated by dividing a company's Operating Income(EBIT) by its Interest Expense. Alliant Energy's Operating Income for the three months ended in Mar. 2026 was € 215 Mil. Alliant Energy's Interest Expense for the three months ended in Mar. 2026 was € -123 Mil. Alliant Energy's Interest Coverage for the quarter that ended in Mar. 2026 was 1.75. The higher the ratio, the stronger the company's financial strength is. Note: If both Interest Expense and Interest Income are empty, while Net Interest Income is negative, then use Net Interest Income as Interest Expense.

Alliant Energy  (STU:AY1) Interest Expense Explanation

Interest Coverage is a ratio that determines how easily a company can pay interest expenses on outstanding debt. It is calculated by dividing a company's Operating Income (EBIT) by its Interest Expense. The higher, the better.

Note: If both Interest Expense and Interest Income are empty, while Net Interest Income is negative, then use Net Interest Income as Interest Expense.

Alliant Energy's Interest Expense for the three months ended in Mar. 2026 was €-123 Mil. Its Operating Income for the three months ended in Mar. 2026 was €215 Mil. And its Long-Term Debt & Capital Lease Obligation for the three months ended in Mar. 2026 was €9,521 Mil.

Alliant Energy's Interest Coverage for the quarter that ended in Mar. 2026 is calculated as

Interest Coverage=-1* Operating Income (Q: Mar. 2026 )/Interest Expense (Q: Mar. 2026 )
=-1*215.385/-122.83
=1.75

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

The higher the ratio, the stronger the company's financial strength is.

Alliant Energy Interest Expense Historical Data

* Premium members only.

The historical data trend for Alliant Energy's Interest Expense can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Alliant Energy Interest Expense Chart

Alliant Energy Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Interest Expense
Get a 7-Day Free Trial Premium Member Only Premium Member Only -251.34 -306.80 -337.46 -408.74 -415.04

Alliant Energy Quarterly Data
Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26
Interest Expense Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only -110.08 -107.51 -109.06 -97.36 -122.83
STU:AY1
78GF Score
Alliant Energy Corp STU:AY1
Interest Expense is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Alliant Energy Interest Expense Calculation

Interest Expense is the amount reported by a company or individual as an expense for borrowed money.

Interest Expense for the trailing twelve months (TTM) ended in Mar. 2026 adds up the quarterly data reported by the company within the most recent 12 months, which was €-437 Mil.

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Frequently Asked Questions Learn more about Interest Expense →
What does a Interest Expense of €-437 Mil mean?
Alliant Energy (STU:AY1) has a Interest Expense of €-437 Mil as of Mar. 2026. Interest Expense is the amount a company pays on its long-term debt. View historical data on Alliant Energy and its competitors.
Is Alliant Energy's Interest Expense too high?
Alliant Energy's current Interest Expense is €-437 Mil. Overall, Alliant Energy has a GF Score™ of 78/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Alliant Energy's Interest Expense compare to EVRG and CMS?
Alliant Energy's Interest Expense of €-437 Mil can be compared against companies in the Utilities - Regulated industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Interest Expense for an Utilities - Regulated company?
A good Interest Expense depends on the Utilities - Regulated industry context. However, Interest Expense should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Interest Expense mean?
A high Interest Expense can signal that a stock is expensive relative to its fundamentals. Interest Expense is the amount a company pays on its long-term debt. View historical data on Alliant Energy and its competitors. Alliant Energy's current Interest Expense is €-437 Mil. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Alliant Energy stock overvalued right now?
Based on GuruFocus' analysis, Alliant Energy (STU:AY1) is currently considered Modestly Overvalued. The stock's GF Value™ is €57.43, compared to a current price of €65.30 — trading 13.7% above its estimated fair value. The current Interest Expense is €-437 Mil. Alliant Energy's overall GF Score™ is 78/100 with 10 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Interest Expense calculated?
Interest Expense is calculated from a company's financial statements. For Alliant Energy (STU:AY1), the current Interest Expense is €-437 Mil as of Mar. 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is Alliant Energy (STU:AY1) Overvalued in 2026?

Based on GuruFocus' analysis, Alliant Energy stock appears to be overvalued. The current stock price of €65.30 is trading 13.7% above its estimated GF Value™ of €57.43. GuruFocus considers Alliant Energy to be Modestly Overvalued.

Key valuation signals for STU:AY1:

  • Interest Expense: €-437 Mil
  • GF Value™: €57.43 vs. price of €65.30 (13.7% above fair value)
  • GF Score™: 78/100 with 10 warning signs

No single metric tells the full story. See the STU:AY1 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.

Alliant Energy Business Description

Other Exchanges LNT:USA0HCT:UK
Address 4902 North Biltmore Lane, Madison, WI, USA, 53718
Alliant Energy is the parent of two regulated utilities, Interstate Power and Light and Wisconsin Power and Light. Together, IPL and WPL serve nearly 1 million electric customers and 425,000 natural gas-only customers. Both subsidiaries engage in the generation and distribution of electricity and the distribution and transportation of natural gas. Alliant also owns a 16% interest in American Transmission.
78GF Score

Get the complete analysis for STU:AY1

Interest Expense is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

€65.30
Price
€57.43
GF Value