---
schema_version: "secwatch.filing_event.v1"
accession: "0001466593-26-000054"
form_type: "8-K"
ticker: "OTTR"
cik: "0001466593"
company_name: "Otter Tail Corp"
filed_at: "2026-05-15T17:57:25+00:00"
generated_at: "2026-05-15T17:59:39.011237+00:00"
event_type: "regulatory"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Otter Tail files 2026 IRP with MN PUC; plans 50MW gas, 100MW wind, solar, battery

## Summary
- Filed 2026 Integrated Resource Plan with Minnesota PUC; includes a 50MW natural gas plant expected in 2031 or 2032.
- Two 50MW wind generation facilities planned for 2035 and 2040.
- Ongoing projects: 50MW Solway Solar (2026), 295MW Abercrombie Solar (2028), 75MW battery storage.
- Coyote Station coal plant to be designated AME starting June 1, 2026; to stop serving MN customers by Dec 31, 2031.

## SEC filing metadata
- accession: 0001466593-26-000054
- form_type: 8-K
- ticker: OTTR
- cik: 0001466593
- company_name: Otter Tail Corp
- filed_at: 2026-05-15T17:57:25+00:00
- event_type: regulatory
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1466593/000146659326000054/0001466593-26-000054-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1466593/000146659326000054/ottr-20260515.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001466593-26-000054
- JSON: https://secwatch.observer/filing/0001466593-26-000054.json
- Plain text: https://secwatch.observer/filing/0001466593-26-000054.txt

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