---
schema_version: "secwatch.filing_event.v1"
accession: "0001993004-26-000046"
form_type: "8-K"
ticker: "NWE"
cik: "0001993004"
company_name: "NorthWestern Energy Group, Inc."
filed_at: "2026-06-22T14:47:07+00:00"
generated_at: "2026-06-22T14:48:07.255549+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# NorthWestern Energy subsidiary issues $150M in 5.51% First Mortgage Bonds due 2036

## Summary
- Issued $150M aggregate principal of South Dakota First Mortgage Bonds on June 15, 2026.
- Bonds carry a 5.51% interest rate and mature on June 15, 2036.
- Bonds rank equally with all current and future first-mortgage-secured debt.
- NWE Public Service may redeem bonds at any time prior to maturity at a make-whole price.
- Proceeds used for general corporate purposes; issuance exempt from SEC registration.

## SEC filing metadata
- accession: 0001993004-26-000046
- form_type: 8-K
- ticker: NWE
- cik: 0001993004
- company_name: NorthWestern Energy Group, Inc.
- filed_at: 2026-06-22T14:47:07+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1993004/000199300426000046/0001993004-26-000046-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1993004/000199300426000046/nwe-20260615.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001993004-26-000046
- JSON: https://secwatch.observer/filing/0001993004-26-000046.json
- Plain text: https://secwatch.observer/filing/0001993004-26-000046.txt

## Key facts
- Debt Financings
  NorthWestern Energy Group, Inc. incurred senior notes of $150 million with The Bank of New York Mellon at 5.51% maturing June 15, 2036.
  - Instrument: senior notes
  - Principal: $150 million
  - Counterparty: The Bank of New York Mellon
  - Rate: 5.51%
  - Maturity: June 15, 2036
  - Event: incurrence
  source text: The SD Bonds were drawn and issued in one series as follows: Issue Date Maturity Date Principal Amount Interest Rate June 15, 2026 June 15, 2036 $150 million 5.51%
  evidence_url: https://www.sec.gov/Archives/edgar/data/1993004/000199300426000046/0001993004-26-000046-index.htm
- Material Agreements
  NorthWestern Energy Group, Inc. entered into Twenty-third Supplemental Indenture with The Bank of New York Mellon valued at $150 million (effective 2026-06-01).
  - Action: entry
  - Agreement: notes offering
  - Counterparty: The Bank of New York Mellon
  - Value: $150 million
  - Effective: 2026-06-01
  source text: The SD Bonds were drawn and issued in one series as follows: Issue Date Maturity Date Principal Amount Interest Rate June 15, 2026 June 15, 2036 $150 million 5.51% The terms of the SD Bonds were established in the Twenty-third Supplemental Indenture, dated as of June 1, 2026 (the " SD Supplemental Indenture "), between NWE Public Service and The Bank of New York Mellon, as trustee.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1993004/000199300426000046/0001993004-26-000046-index.htm

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