Business Segments (Tables)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Business Segments [Table Text Block]

	Quarter Ended		Nine Months Ended
	September 30,		September 30,
	2022	2021	2022	2021
Millions
Operating Revenue
Regulated Operations
Residential	$40.1	$37.0	$136.7	$118.0
Commercial	49.0	44.3	141.7	124.7
Municipal	9.8	14.4	31.9	38.5
Industrial	147.3	139.7	445.7	407.8
Other Power Suppliers	46.7	41.2	124.6	116.9
Other	29.7	28.2	79.7	82.3
Total Regulated Operations	322.6	304.8	960.3	888.2
ALLETE Clean Energy
Long-term PSA	14.4	14.0	58.7	50.8
Other	1.2	2.9	6.3	8.6
Total ALLETE Clean Energy	15.6	16.9	65.0	59.4
Corporate and Other
Long-term Contract	23.5	20.3	67.5	63.4
Sale of Renewable Development Projects	22.1	—	36.6	—
Other	4.5	3.4	15.5	9.2
Total Corporate and Other	50.1	23.7	119.6	72.6
Total Operating Revenue	$388.3	$345.4	$1,144.9	$1,020.2
Net Income (Loss) Attributable to ALLETE
Regulated Operations	$38.3	$32.9	$119.4	$99.4
ALLETE Clean Energy	(7.3)	(0.8)	15.0	11.7
Corporate and Other (a)	2.7	(4.5)	3.2	(3.8)
Total Net Income Attributable to ALLETE	$33.7	$27.6	$137.6	$107.3

(a)Net Income in 2022 includes a $5.7 million after-tax expense as a result of purchase price accounting related to projects under development at the time of acquisition and $2.6 million after-tax of transaction costs related to the acquisition of New Energy.

	September 30, 2022	December 31, 2021
Millions
Assets
Regulated Operations	$4,307.3	$4,289.4
ALLETE Clean Energy	1,893.2	1,719.4
Corporate and Other	657.5	426.2
Total Assets	$6,858.0	$6,435.0