---
schema_version: "secwatch.filing_event.v1"
accession: "0001466593-22-000060"
form_type: "8-K"
ticker: "OTTR"
cik: "0001466593"
company_name: "Otter Tail Corp"
filed_at: "2022-10-19T23:59:59+00:00"
generated_at: "2026-06-23T02:38:14.590423+00:00"
event_type: "regulatory"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Otter Tail subsidiary updates IRP; cites FERC, MISO changes; dual fuel project details revised.

## Summary
- Otter Tail Power filed supplemental IRP update with Minnesota PUC on Oct 14, 2022, requesting procedural schedule amendment.
- Cites FERC-approved MISO seasonal resource adequacy construct and Inflation Reduction Act as factors requiring revised modeling.
- Updated modeling results and IRP revisions expected by March 31, 2023.
- Dual fuel capability at Astoria Station remains on track for 2026; secondary fuel source may shift from fuel oil to LNG.
- Filed similar letters with North Dakota and South Dakota public utility commissions.

## SEC filing metadata
- accession: 0001466593-22-000060
- form_type: 8-K
- ticker: OTTR
- cik: 0001466593
- company_name: Otter Tail Corp
- filed_at: 2022-10-19T23:59:59+00:00
- event_type: regulatory
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1466593/000146659322000060/0001466593-22-000060-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1466593/000146659322000060/ottr-20221014.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001466593-22-000060
- JSON: https://secwatch.observer/filing/0001466593-22-000060.json
- Plain text: https://secwatch.observer/filing/0001466593-22-000060.txt

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