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Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2023

Selected Quarterly Financial Information [Abstract]

Quarterly Financial Data (Unaudited)


Quarter Ended			Mar. 31			Jun. 30			Sept. 30			Dec. 31
Millions Except Earnings Per Share
2023
Operating Revenue			$564.9			$533.4			$378.8			$402.7
Operating Income			$48.3			$53.5			$36.0			$43.1
Net Income Attributable to ALLETE			$58.2			$51.5			$85.9			$51.5
Earnings Per Share of Common Stock
Basic			$1.02			$0.90			$1.50			$0.89
Diluted			$1.02			$0.90			$1.49			$0.89
2022
Operating Revenue			$383.5			$373.1			$388.3			$425.8
Operating Income			$53.4			$13.7			$33.4			$33.7
Net Income Attributable to ALLETE			$66.3			$37.6			$33.7			$51.7
Earnings Per Share of Common Stock
Basic			$1.24			$0.67			$0.59			$0.90
Diluted			$1.24			$0.67			$0.59			$0.90
2021
Operating Revenue			$339.2			$335.6			$345.4			$399.0
Operating Income			$42.0			$28.2			$31.1			$50.0
Net Income Attributable to ALLETE			$51.8			$27.9			$27.6			$61.9
Earnings Per Share of Common Stock
Basic			$0.99			$0.53			$0.53			$1.18
Diluted			$0.99			$0.53			$0.53			$1.18