---
schema_version: "secwatch.filing_event.v1"
accession: "0001466593-23-000089"
form_type: "8-K"
ticker: "OTTR"
cik: "0001466593"
company_name: "Otter Tail Corp"
filed_at: "2023-03-31T23:59:59+00:00"
generated_at: "2026-06-17T07:46:05.670152+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Otter Tail Power files supplemental IRP; plans 200 MW solar, 200 MW wind, potential Coyote Station exit

## Summary
- Plans to add ~200 MW solar (2027-2028) and ~200 MW wind (2029) plus LNG storage at Astoria Station in 2026.
- Repowering four existing wind facilities in 2024-2025; seeks to create regulatory asset for potential Coyote Station exit.
- Potential withdrawal from 35% ownership in Coyote Station coal plant if major non-routine capital needed; estimated costs $68.5M at end-2028.
- Filing updates 2022 IRP; cites MISO reserve margins, Inflation Reduction Act tax credits, Minnesota Clean Energy Bill, market volatility.

## SEC filing metadata
- accession: 0001466593-23-000089
- form_type: 8-K
- ticker: OTTR
- cik: 0001466593
- company_name: Otter Tail Corp
- filed_at: 2023-03-31T23:59:59+00:00
- event_type: other_material
- 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/1466593/000146659323000089/0001466593-23-000089-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1466593/000146659323000089/ottr-20230331.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001466593-23-000089
- JSON: https://secwatch.observer/filing/0001466593-23-000089.json
- Plain text: https://secwatch.observer/filing/0001466593-23-000089.txt

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