---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-265885"
form_type: "8-K"
ticker: null
cik: "0000072909"
company_name: "NORTHERN STATES POWER CO /WI/"
filed_at: "2026-06-10T20:24:26+00:00"
generated_at: "2026-06-10T20:31:08.011611+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# NSP-Wisconsin issues $250M of 5.48% first mortgage bonds due 2041

## Summary
- Issued $250M aggregate principal of 5.48% First Mortgage Bonds, Series due June 15, 2041.
- Net proceeds of ~$249M; use for general corporate purposes; closing expected June 15, 2026.
- Bonds secured by first mortgage lien on substantially all real and fixed properties.
- Huntington Securities acted as sole placement agent; bonds sold in private placement.
- Make-whole redemption prior to Dec 15, 2040; par redemption thereafter.

## SEC filing metadata
- accession: 0001193125-26-265885
- form_type: 8-K
- cik: 0000072909
- company_name: NORTHERN STATES POWER CO /WI/
- filed_at: 2026-06-10T20:24:26+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/72909/000119312526265885/0001193125-26-265885-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/72909/000119312526265885/d165471d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-265885
- JSON: https://secwatch.observer/filing/0001193125-26-265885.json
- Plain text: https://secwatch.observer/filing/0001193125-26-265885.txt

## Key facts
- Debt Financings
  NORTHERN STATES POWER CO /WI/ incurred senior notes of $250 million with certain institutional investors at 5.48% maturing June 15, 2041.
  - Instrument: senior notes
  - Principal: $250 million
  - Counterparty: certain institutional investors
  - Rate: 5.48%
  - Maturity: June 15, 2041
  - Event: incurrence
  source text: On June 9, 2026, Northern States Power Company, a Wisconsin corporation (“NSP-Wisconsin”), entered into a Bond Purchase Agreement (the “Bond Purchase Agreement”) with certain institutional investors for the offer and sale of $250 million in aggregate principal amount of 5.48% First Mortgage Bonds, Series due June 15, 2041 (the “Bonds”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/72909/000119312526265885/0001193125-26-265885-index.htm

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