Quick Answer
ALLIANT ENERGY CORP reported Long-Term Debt of $10.95 billion for fiscal year 2025.
ALLIANT ENERGY CORP Long-Term Debt — Annual History
| Fiscal Year | Long-Term Debt | YoY Change |
|---|---|---|
| 2025 | $10.95B | +26.2% |
| 2024 | $8.68B | +5.5% |
| 2023 | $8.22B | +7.3% |
| 2022 | $7.67B | +13.9% |
| 2021 | $6.74B | -0.5% |
| 2020 | $6.77B | +22.3% |
| 2019 | $5.53B | +5.5% |
| 2018 | $5.25B | +30.8% |
| 2017 | $4.01B | -7.1% |
| 2016 | $4.32B | +22.5% |
| 2015 | $3.52B | -1.7% |
| 2014 | $3.58B | +20.4% |
| 2013 | $2.98B | -5.1% |
| 2012 | $3.14B | +16.0% |
| 2011 | $2.70B | -0.0% |
| 2010 | $2.70B | +12.4% |
| 2009 | $2.40B | — |
Quarterly Long-Term Debt
| Quarter Ending | Long-Term Debt | YoY | QoQ |
|---|---|---|---|
| September 30, 2025 | $10.65B | +15.3% | +10.5% |
| June 30, 2025 | $9.64B | +8.3% | +12.4% |
| March 31, 2025 | $8.58B | +0.7% | -1.1% |
| December 31, 2024 | $8.68B | +5.5% | -6.1% |
| September 30, 2024 | $9.24B | +9.7% | +3.9% |
| June 30, 2024 | $8.90B | +8.7% | +4.4% |
| March 31, 2024 | $8.52B | +4.8% | +3.6% |
| December 31, 2023 | $8.22B | +7.3% | -2.4% |
- ALLIANT ENERGY CORP showed an increase of +26.2% in Long-Term Debt compared to the prior fiscal year.
- Over the 2009–2025 period, ALLIANT ENERGY CORP’s long-term debt has grown by 355.6% (from $2.40 billion to $10.95 billion).
- The most recent figure is from ALLIANT ENERGY CORP’s fiscal year 2025 report (Form 10-K), filed with the SEC on February 20, 2026.
- All figures are sourced from SEC EDGAR XBRL filings, last verified June 17, 2026.
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