---
schema_version: "secwatch.filing_event.v1"
accession: "0001466593-25-000054"
form_type: "8-K"
ticker: "OTTR"
cik: "0001466593"
company_name: "Otter Tail Corp"
filed_at: "2025-03-31T23:59:59+00:00"
generated_at: "2026-05-24T01:41:24.919528+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 $100M in senior notes at 5.49% and 5.98%

## Summary
- $50M 5.49% Series 2025A Notes due 2035 issued March 27; $50M 5.98% Series 2025B Notes due 2055 expected June 5.
- Proceeds to fund capital expenditures, refinance existing debt, and for general corporate purposes.
- Covenants limit Interest-bearing Debt to ≤65% of Total Capitalization and Priority Indebtedness to ≤20%.
- Notes are unsecured senior obligations of Otter Tail Power Company, a wholly owned subsidiary.
- Prepayment at 100% plus make-whole; change-of-control triggers offer to prepay.

## SEC filing metadata
- accession: 0001466593-25-000054
- form_type: 8-K
- ticker: OTTR
- cik: 0001466593
- company_name: Otter Tail Corp
- filed_at: 2025-03-31T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1466593/000146659325000054/0001466593-25-000054-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1466593/000146659325000054/ottr-20250327.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001466593-25-000054
- JSON: https://secwatch.observer/filing/0001466593-25-000054.json
- Plain text: https://secwatch.observer/filing/0001466593-25-000054.txt

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