Compare power plants

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

Metric	John P Madgett Buffalo County	Big Stone Grant County
Capacity	387 MW	450 MW
Technology	Conventional Steam Coal	Conventional Steam Coal
Operator	Dairyland Power Coop	Otter Tail Power Co
Operating units	1	2
Latest 12-month generation	1.09 TWh	1.69 TWh
Latest complete-year capacity factor	37.9% (2025)	51.5% (2025)
National technology rank	#135 of 206	#130 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	John P Madgett Buffalo County	Big Stone Grant County
Capacity	387 MW	450 MW
Technology	Conventional Steam Coal	Conventional Steam Coal
Operator	Dairyland Power Coop	Otter Tail Power Co
Operating units	1	2
Latest 12-month generation	1.09 TWh	1.69 TWh
Latest complete-year capacity factor	37.9% (2025)	51.5% (2025)
National technology rank	#135 of 206	#130 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.