---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-25-026398"
form_type: "8-K"
ticker: "LNT"
cik: "0000352541"
company_name: "ALLIANT ENERGY CORP"
filed_at: "2025-05-19T23:59:59+00:00"
generated_at: "2026-05-21T02:19:44.857160+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Interstate Power & Light prices $600M 5.600% senior debentures due 2035

## Summary
- IPL issued $600M aggregate principal of 5.600% senior debentures due June 29, 2035.
- Net proceeds to retire $50M 5.50% debentures due July 2025 and $250M 3.40% debentures due Aug 2025.
- Proceeds also used to reduce commercial paper and receivables program; closing expected May 19, 2025.
- Joint book-running managers: BofA Securities, Mizuho, MUFG Securities Americas, and Wells Fargo Securities.

## SEC filing metadata
- accession: 0001628280-25-026398
- form_type: 8-K
- ticker: LNT
- cik: 0000352541
- company_name: ALLIANT ENERGY CORP
- filed_at: 2025-05-19T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/352541/000162828025026398/0001628280-25-026398-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/52485/000162828025026398/lnt-20250513.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-026398
- JSON: https://secwatch.observer/filing/0001628280-25-026398.json
- Plain text: https://secwatch.observer/filing/0001628280-25-026398.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.