---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-133114"
form_type: "8-K"
ticker: "MGEE"
cik: "0001161728"
company_name: "MGE ENERGY INC"
filed_at: "2024-12-04T23:59:59+00:00"
generated_at: "2026-05-29T08:13:00.578002+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# MGE Energy, partners delay Columbia coal suspension to 2029, explore gas conversion

## Summary
- Coal operations at Columbia Energy Center now set to end in 2029, shifted from 2026.
- Partners will explore converting at least one unit to natural gas to support reliability and growth.
- MGE holds a 19% ownership interest in the jointly-owned plant in Portage, Wisconsin.
- Shift responds to MISO accreditation changes and expected load growth; carbon goals unchanged.
- Columbia Energy Storage Project (18 MW, 10-hr storage) under regulatory review, operational by end 2027.

## SEC filing metadata
- accession: 0000950170-24-133114
- form_type: 8-K
- ticker: MGEE
- cik: 0001161728
- company_name: MGE ENERGY INC
- filed_at: 2024-12-04T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1161728/000095017024133114/0000950170-24-133114-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/61339/000095017024133114/mgee-20241204.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-133114
- JSON: https://secwatch.observer/filing/0000950170-24-133114.json
- Plain text: https://secwatch.observer/filing/0000950170-24-133114.txt

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