Revenues (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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

	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
Commercial and industrial (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

	Three Months Ended June 30, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	58.7	$	10.9	$	—	$	69.6
C&I	106.4		9.4		—		115.8
Other	1.8		—		0.3		2.1
Total retail	166.9		20.3		0.3		187.5
Interchange	38.4		—		—		$	38.4
Other	1.3		1.1		—		2.4
Total revenue from contracts with customers	206.6		21.4		0.3		228.3
Alternative revenue and other	2.9		0.6		—		3.5
Total revenues	$	209.5	$	22.0	$	0.3	$	231.8

	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

	Six Months Ended June 30, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	126.5	$	41.3	$	—	$	167.8
C&I	211.2		34.0		—		245.2
Other	3.4		—		0.5		3.9
Total retail	341.1		75.3		0.5		416.9
Interchange	76.0		—		—		76.0
Other	2.9		2.0		—		4.9
Total revenue from contracts with customers	420.0		77.3		0.5		497.8
Alternative revenue and other	5.9		1.2		—		7.1
Total revenues	$	425.9	$	78.5	$	0.5	$	504.9