---
schema_version: "secwatch.filing_event.v1"
accession: "0001637880-26-000030"
form_type: "8-K"
ticker: null
cik: "0001637880"
company_name: "Tri-State Generation & Transmission Association, Inc."
filed_at: "2026-05-28T16:21:20+00:00"
generated_at: "2026-05-28T16:32:38.850531+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Midwest Electric gives two-year notice to withdraw from Tri-State membership

## Summary
- Midwest provided non-conditional two-year withdrawal notice on May 27, 2026, effective June 1, 2028.
- Midwest accounted for 1.9% of Tri-State's utility member revenue and 1.3% of operating revenue in 2025.
- Withdrawal governed by FERC tariff Rate Schedule No. 281; contract termination payment to be determined.
- Tri-State states it cannot predict if Midwest will ultimately complete the withdrawal.

## SEC filing metadata
- accession: 0001637880-26-000030
- form_type: 8-K
- cik: 0001637880
- company_name: Tri-State Generation & Transmission Association, Inc.
- filed_at: 2026-05-28T16:21:20+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1637880/000163788026000030/0001637880-26-000030-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1637880/000163788026000030/tris-20260527.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001637880-26-000030
- JSON: https://secwatch.observer/filing/0001637880-26-000030.json
- Plain text: https://secwatch.observer/filing/0001637880-26-000030.txt

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