---
schema_version: "secwatch.filing_event.v1"
accession: "0001466593-26-000061"
form_type: "8-K"
ticker: "OTTR"
cik: "0001466593"
company_name: "Otter Tail Corp"
filed_at: "2026-06-05T13:52:28+00:00"
generated_at: "2026-06-05T13:53:06.096742+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Otter Tail Power issues $70M 6.04% senior notes due 2056

## Summary
- $70M aggregate principal of Series 2026B Notes at 6.04% due June 4, 2056.
- Proceeds to fund capital expenditures, refinance existing debt, and general corporate purposes.
- Covenant limits: Interest-bearing Debt ≤65% of Total Capitalization; Priority Indebtedness ≤20%.
- Notes are senior unsecured obligations of Otter Tail Power Company, a wholly owned subsidiary.
- Issuance under Note Purchase Agreement previously reported on March 23, 2026.

## SEC filing metadata
- accession: 0001466593-26-000061
- form_type: 8-K
- ticker: OTTR
- cik: 0001466593
- company_name: Otter Tail Corp
- filed_at: 2026-06-05T13:52:28+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 2.03
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1466593/000146659326000061/0001466593-26-000061-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1466593/000146659326000061/ottr-20260604.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001466593-26-000061
- JSON: https://secwatch.observer/filing/0001466593-26-000061.json
- Plain text: https://secwatch.observer/filing/0001466593-26-000061.txt

## Key facts
- Debt Financings
  Otter Tail Corp incurred senior notes of $70,000,000 with Purchasers named in Note Purchase Agreement at 6.04% maturing June 4, 2056.
  - Instrument: senior notes
  - Principal: $70,000,000
  - Counterparty: Purchasers named in Note Purchase Agreement
  - Rate: 6.04%
  - Maturity: June 4, 2056
  - Event: incurrence
  source text: On June 4, 2026, OTP issued the Series 2026B Notes pursuant to the Note Purchase Agreement for aggregate proceeds of $70,000,000.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1466593/000146659326000061/0001466593-26-000061-index.htm

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