Business Segments (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Business Segments [Table Text Block]

	Quarter Ended		Nine Months Ended
	September 30,		September 30,
	2021	2020	2021	2020
Millions
Operating Revenue
Regulated Operations
Residential	$37.0	$34.2	$118.0	$102.5
Commercial	44.3	37.1	124.7	103.2
Municipal	14.4	11.2	38.5	30.5
Industrial	139.7	109.6	407.8	316.4
Other Power Suppliers	41.2	30.9	116.9	96.6
CIP Financial Incentive (a)	2.4	2.4	2.4	2.4
Other	25.8	29.7	79.9	69.6
Total Regulated Operations	304.8	255.1	888.2	721.2
ALLETE Clean Energy
Long-term PSA	14.0	11.9	50.8	44.0
Other	2.9	2.9	8.6	8.5
Total ALLETE Clean Energy	16.9	14.8	59.4	52.5
Corporate and Other
Long-term Contract	20.3	20.7	63.4	65.6
Other	3.4	3.3	9.2	9.4
Total Corporate and Other	23.7	24.0	72.6	75.0
Total Operating Revenue	$345.4	$293.9	$1,020.2	$848.7
Net Income (Loss) Attributable to ALLETE
Regulated Operations	$32.9	$42.4	$99.4	$111.0
ALLETE Clean Energy	(0.8)	1.1	11.7	16.8
Corporate and Other	(4.5)	(2.8)	(3.8)	(0.7)
Total Net Income Attributable to ALLETE	$27.6	$40.7	$107.3	$127.1

(a)See Note 2. Regulatory Matters.

	September 30, 2021	December 31, 2020
Millions
Assets
Regulated Operations	$4,207.4	$4,196.8
ALLETE Clean Energy	1,691.4	1,483.3
Corporate and Other	433.4	404.5
Total Assets	$6,332.2	$6,084.6