Revenues (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

NSP-Wisconsin’s operating revenues consists of the following:

	Three Months Ended June 30, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	59.6	$	10.6	$	—	$	70.2
C&I	93.2		6.8		—		100.0
Other	2.0		—		0.2		2.2
Total retail	154.8		17.4		0.2		172.4
Interchange	41.5		—		—		41.5
Other	0.1		1.1		—		1.2
Total revenue from contracts with customers	196.4		18.5		0.2		215.1
Alternative revenue and other	2.9		0.5		—		3.4
Total revenues	$	199.3	$	19.0	$	0.2	$	218.5

	Three Months Ended June 30, 2019
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	54.1	$	10.8	$	—	$	64.9
C&I	105.1		8.6		—		113.7
Other	2.1		—		0.1		2.2
Total retail	161.3		19.4		0.1		180.8
Interchange	43.5		—		—		43.5
Other	0.1		0.9		—		1.0
Total revenue from contracts with customers	204.9		20.3		0.1		225.3
Alternative revenue and other	3.0		0.6		—		3.6
Total revenues	$	207.9	$	20.9	$	0.1	$	228.9

	Six Months Ended June 30, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	124.6	$	35.1	$	—	$	159.7
C&I	193.6		26.3		—		219.9
Other	3.6		—		0.2		3.8
Total retail	321.8		61.4		0.2		383.4
Interchange	82.4		—		—		82.4
Other	0.6		1.9		—		2.5
Total revenue from contracts with customers	404.8		63.3		0.2		468.3
Alternative revenue and other	6.3		0.9		—		7.2
Total revenues	$	411.1	$	64.2	$	0.2	$	475.5

	Six Months Ended June 30, 2019
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	121.5	$	44.4	$	—	$	165.9
C&I	203.6		34.4		—		238.0
Other	3.6		—		0.2		3.8
Total retail	328.7		78.8		0.2		407.7
Interchange	87.6		—		—		87.6
Other	0.6		2.0		—		2.6
Total revenue from contracts with customers	416.9		80.8		0.2		497.9
Alternative revenue and other	6.0		1.2		—		7.2
Total revenues	$	422.9	$	82.0	$	0.2	$	505.1