---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-226896"
form_type: "8-K"
ticker: "BKH"
cik: "0001130464"
company_name: "BLACK HILLS CORP /SD/"
filed_at: "2026-05-15T20:27:31+00:00"
generated_at: "2026-05-15T21:11:12.821117+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# NorthWestern Q1 net income down 18% YoY; merger with Black Hills on track for H2 2026

## Summary
- NorthWestern Q1 2026 net income $63.5M ($1.03 diluted EPS) vs $76.9M ($1.25) YoY.
- Revenue $497.6M, up 6.6% YoY from $466.6M, on higher electric and gas revenue.
- Merger with Black Hills: shareholders approved in Apr 2026; HSR period expired; settlements in NE, MT, SD filed.
- Regulatory approvals pending from MPSC, NPSC, SDPUC, and FERC; hearings scheduled in Q2 2026.
- Colstrip acquisitions (Avista/Puget interests) closed Jan 1, 2026; interim PCCAM waiver approved.

## SEC filing metadata
- accession: 0001193125-26-226896
- form_type: 8-K
- ticker: BKH
- cik: 0001130464
- company_name: BLACK HILLS CORP /SD/
- filed_at: 2026-05-15T20:27:31+00:00
- event_type: other_material
- sentiment: neutral
- 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/1130464/000119312526226896/0001193125-26-226896-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1130464/000119312526226896/bkh-20260515.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-226896
- JSON: https://secwatch.observer/filing/0001193125-26-226896.json
- Plain text: https://secwatch.observer/filing/0001193125-26-226896.txt

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