---
schema_version: "secwatch.filing_event.v1"
accession: "0001466593-25-000097"
form_type: "8-K"
ticker: "OTTR"
cik: "0001466593"
company_name: "Otter Tail Corp"
filed_at: "2025-06-06T23:59:59+00:00"
generated_at: "2026-05-19T18:18:53.418163+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Otter Tail Power subsidiary issues $50M 5.98% senior notes due 2055

## Summary
- Otter Tail Power Company issued $50M 5.98% Series 2025B Senior Notes due June 5, 2055.
- Proceeds will fund capital expenditures, refinance existing debt, and general corporate purposes.
- Debt covenants cap Interest-bearing Debt at 65% and Priority Indebtedness at 20% of Total Capitalization.
- Notes are privately placed; prepayment allowed with make-whole amount except near maturity.

## SEC filing metadata
- accession: 0001466593-25-000097
- form_type: 8-K
- ticker: OTTR
- cik: 0001466593
- company_name: Otter Tail Corp
- filed_at: 2025-06-06T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 2.03
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1466593/000146659325000097/0001466593-25-000097-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1466593/000146659325000097/ottr-20250605.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001466593-25-000097
- JSON: https://secwatch.observer/filing/0001466593-25-000097.json
- Plain text: https://secwatch.observer/filing/0001466593-25-000097.txt

## Key facts
- Debt Financings
  Otter Tail Corp incurred senior notes of $50,000,000 in aggregate principal amount of its 5.98% Series 2025B Senior Unsecured Notes at 5.98% maturing June 5, 2055.
  - Instrument: senior notes
  - Principal: $50,000,000 in aggregate principal amount of its 5.98% Series 2025B Senior Unsecured Notes
  - Rate: 5.98%
  - Maturity: June 5, 2055
  - Event: incurrence
  source text: On June 5, 2025, OTP issued the Series 2025B Notes pursuant to the Note Purchase Agreement for aggregate proceeds of $50,000,000.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1466593/000146659325000097/0001466593-25-000097-index.htm

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