---
schema_version: "secwatch.filing_event.v1"
accession: "0001993004-24-000075"
form_type: "8-K"
ticker: "NWE"
cik: "0001993004"
company_name: "NorthWestern Energy Group, Inc."
filed_at: "2024-08-02T23:59:59+00:00"
generated_at: "2026-05-31T13:31:43.812035+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# NWE to acquire PSE's 25% Colstrip interest for $0; ownership to rise to 40%/70% of Units 3/4 by Dec 31, 2025

## Summary
- Acquisition price is $0; NWE assumes operational costs from Jan 1, 2026; PSE retains pre-closing environmental and pension liabilities.
- Combined with prior Avista deal (15% each unit), NWE will own 40% of Unit 3 and 70% of Unit 4 post-closing.
- Transaction effective Dec 31, 2025, subject to regulatory approvals including FERC and possibly state commissions.
- Other Colstrip owners have right of first refusal; NWE may exercise its ROFR if triggered.
- Condition to close includes NWE entering a new coal supply agreement by Dec 31, 2024 (waivable).

## SEC filing metadata
- accession: 0001993004-24-000075
- form_type: 8-K
- ticker: NWE
- cik: 0001993004
- company_name: NorthWestern Energy Group, Inc.
- filed_at: 2024-08-02T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1993004/000199300424000075/0001993004-24-000075-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1993004/000199300424000075/nwe-20240730.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001993004-24-000075
- JSON: https://secwatch.observer/filing/0001993004-24-000075.json
- Plain text: https://secwatch.observer/filing/0001993004-24-000075.txt

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