Compare power plants

Registry, engineering, and operating metrics shown on a consistent EIA basis.

Metric	Columbia (WI) Columbia County	Merom Sullivan County
Capacity	1,112 MW	1,080 MW
Technology	Conventional Steam Coal	Conventional Steam Coal
Operator	Wisconsin Power & Light Co	Hallador Power Company, LLC
Operating units	2	2
Latest 12-month generation	5.15 TWh	4.43 TWh
Latest complete-year capacity factor	61.1% (2025)	51.0% (2025)
National technology rank	#72 of 206	#76 of 206
Latest EIA report	2026-06	2026-06

Generation comes from EIA-923. Capacity, unit counts, technology, and reporting relationships come from EIA-860. Incomplete reporting years are excluded from capacity-factor comparisons.

Compare power plants

Registry, engineering, and operating metrics shown on a consistent EIA basis.

Metric	Columbia (WI) Columbia County	Merom Sullivan County
Capacity	1,112 MW	1,080 MW
Technology	Conventional Steam Coal	Conventional Steam Coal
Operator	Wisconsin Power & Light Co	Hallador Power Company, LLC
Operating units	2	2
Latest 12-month generation	5.15 TWh	4.43 TWh
Latest complete-year capacity factor	61.1% (2025)	51.0% (2025)
National technology rank	#72 of 206	#76 of 206
Latest EIA report	2026-06	2026-06

Generation comes from EIA-923. Capacity, unit counts, technology, and reporting relationships come from EIA-860. Incomplete reporting years are excluded from capacity-factor comparisons.