Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2022


Quarter Ended	Mar. 31	Jun. 30	Sept. 30	Dec. 31
Millions Except Earnings Per Share
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
2020 (a)
Operating Revenue	$311.6	$243.2	$293.9	$320.4
Operating Income	$60.2	$12.7	$41.6	$23.7
Net Income Attributable to ALLETE	$66.3	$20.1	$40.7	$38.3
Earnings Per Share of Common Stock
Basic	$1.28	$0.39	$0.78	$0.74
Diluted	$1.28	$0.39	$0.78	$0.73

(a) See Immaterial Revision to Prior Period in Note 1. Operations and Significant Accounting Policies.