---
schema_version: "secwatch.filing_event.v1"
accession: "0001466593-24-000121"
form_type: "8-K"
ticker: "OTTR"
cik: "0001466593"
company_name: "Otter Tail Corp"
filed_at: "2024-06-05T23:59:59+00:00"
generated_at: "2026-06-01T06:14:06.143396+00:00"
event_type: "regulatory"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# MPUC approves Otter Tail IRP; orders 200-300MW solar by 2027, coal phase-out by 2031

## Summary
- MPUC directed Otter Tail Power to procure 200-300MW solar by Nov 2027, 150-200MW wind by Dec 2029, and 20-75MW battery storage by Dec 2029.
- Approved on-site LNG storage at Astoria Station by 2027, subject to North Dakota approval.
- Designate Minnesota share of Coyote Station coal plant as AME resource from June 2026 to no later than Dec 2031; if not feasible, stop after 2028.
- Otter Tail must cease serving Minnesota customers with Coyote Station capacity or energy by December 31, 2031.
- Next IRP due May 2026; will include analysis of Big Stone Plant continued operation with AME.

## SEC filing metadata
- accession: 0001466593-24-000121
- form_type: 8-K
- ticker: OTTR
- cik: 0001466593
- company_name: Otter Tail Corp
- filed_at: 2024-06-05T23:59:59+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/1466593/000146659324000121/0001466593-24-000121-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1466593/000146659324000121/ottr-20240530.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001466593-24-000121
- JSON: https://secwatch.observer/filing/0001466593-24-000121.json
- Plain text: https://secwatch.observer/filing/0001466593-24-000121.txt

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