---
schema_version: "secwatch.filing_event.v1"
accession: "0000073088-23-000089"
form_type: "8-K"
ticker: null
cik: "0000073088"
company_name: "NORTHWESTERN CORP"
filed_at: "2023-04-05T23:59:59+00:00"
generated_at: "2026-06-17T06:07:52.606333+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# NorthWestern Corp issues $270M in first mortgage bonds at 5.57% due 2033

## Summary
- Issued $239M Montana First Mortgage Bonds and $31M South Dakota First Mortgage Bonds, both at 5.57% due March 30, 2033.
- Received $189M on March 30, 2023; remaining $50M to be received on May 1, 2023.
- Bonds are unregistered and exempt from SEC registration requirements.
- Proceeds will be used for general corporate purposes (not explicitly stated but typical for such issuances).
- Mary Miselis appointed as successor co-trustee under the mortgage indenture.

## SEC filing metadata
- accession: 0000073088-23-000089
- form_type: 8-K
- cik: 0000073088
- company_name: NORTHWESTERN CORP
- filed_at: 2023-04-05T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/73088/000007308823000089/0000073088-23-000089-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/73088/000007308823000089/nwe-20230330.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000073088-23-000089
- JSON: https://secwatch.observer/filing/0000073088-23-000089.json
- Plain text: https://secwatch.observer/filing/0000073088-23-000089.txt

## Key facts
- Debt Financings
  NORTHWESTERN CORP incurred mortgage of $31 million with The Bank of New York Mellon, as trustee at 5.57% maturing March 30, 2033.
  - Instrument: mortgage
  - Principal: $31 million
  - Counterparty: The Bank of New York Mellon, as trustee
  - Rate: 5.57%
  - Maturity: March 30, 2033
  - Event: incurrence
  source text: On March 30, 2023, the Company also issued and sold $31 million principal amount of the Company's South Dakota First Mortgage Bonds (the " SD Bonds ").
  evidence_url: https://www.sec.gov/Archives/edgar/data/73088/000007308823000089/0000073088-23-000089-index.htm
- Debt Financings
  NORTHWESTERN CORP incurred mortgage of $239 million with The Bank of New York Mellon and Mary Miselis, as trustees at 5.57% maturing March 30, 2033.
  - Instrument: mortgage
  - Principal: $239 million
  - Counterparty: The Bank of New York Mellon and Mary Miselis, as trustees
  - Rate: 5.57%
  - Maturity: March 30, 2033
  - Event: incurrence
  source text: On March 30, 2023, NorthWestern Corporation d/b/a NorthWestern Energy (NYSE: NWE) (the " Company ") issued and sold $239 million principal amount of the Company's Montana First Mortgage Bonds (the " MT Bonds "). The Company received proceeds of $189 million on March 30, 2023, and will receive the remaining $50 million on May 1, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/73088/000007308823000089/0000073088-23-000089-index.htm

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