---
schema_version: "secwatch.filing_event.v1"
accession: "0000352541-21-000099"
form_type: "8-K"
ticker: "LNT"
cik: "0000352541"
company_name: "ALLIANT ENERGY CORP"
filed_at: "2021-11-19T23:59:59+00:00"
generated_at: "2026-06-28T06:43:27.535503+00:00"
event_type: "debt"
sentiment: "positive"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# IPL prices $300M 3.100% senior debentures due 2051; to fund preferred stock redemption

## Summary
- Offering of $300M aggregate principal of 3.100% senior debentures due Nov 30, 2051.
- Proceeds to redeem 5.100% Series D Cumulative Perpetual Preferred Stock and for general corporate purposes.
- Closing expected Nov 19, 2021; underwriters led by Goldman Sachs, J.P. Morgan, MUFG, U.S. Bancorp.
- Issuer is Interstate Power and Light, wholly owned subsidiary of Alliant Energy (LNT).

## SEC filing metadata
- accession: 0000352541-21-000099
- form_type: 8-K
- ticker: LNT
- cik: 0000352541
- company_name: ALLIANT ENERGY CORP
- filed_at: 2021-11-19T23:59:59+00:00
- event_type: debt
- sentiment: positive
- 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/352541/000035254121000099/0000352541-21-000099-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/52485/000035254121000099/lnt-20211116.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000352541-21-000099
- JSON: https://secwatch.observer/filing/0000352541-21-000099.json
- Plain text: https://secwatch.observer/filing/0000352541-21-000099.txt

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