Revenues (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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

	Three Months Ended Sept. 30, 2019
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	63.6	$	6.9	$	—	$	70.5
C&I	116.6		6.1		—		122.7
Other	0.9		—		0.1		1.0
Total retail	181.1		13.0		0.1		194.2
Interchange	44.7		—		—		44.7
Other	0.3		1.0		—		1.3
Total revenue from contracts with customers	226.1		14.0		0.1		240.2
Alternative revenue and other	2.9		0.6		—		3.5
Total revenues	$	229.0	$	14.6	$	0.1	$	243.7

	Three Months Ended Sept. 30, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	67.9	$	7.0	$	—	$	74.9
C&I	127.9		6.9		—		134.8
Other	1.3		—		0.3		1.6
Total retail	197.1		13.9		0.3		211.3
Interchange	40.0		—		—		40.0
Other	0.4		0.9		—		1.3
Total revenue from contracts with customers	237.5		14.8		0.3		252.6
Alternative revenue and other	2.8		0.6		—		3.4
Total revenues	$	240.3	$	15.4	$	0.3	$	256.0

	Nine Months Ended Sept. 30, 2019
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	185.1	$	51.3	$	—	$	236.4
C&I	320.2		40.5		—		360.7
Other	4.5		—		0.3		4.8
Total retail	509.8		91.8		0.3		601.9
Interchange	132.3		—		—		132.3
Other	0.9		3.0		—		3.9
Total revenue from contracts with customers	643.0		94.8		0.3		738.1
Alternative revenue and other	8.9		1.8		—		10.7
Total revenues	$	651.9	$	96.6	$	0.3	$	748.8

	Nine Months Ended Sept. 30, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	194.5	$	48.2	$	—	$	242.7
C&I	339.1		40.8		0.1		380.0
Other	4.7		—		0.8		5.5
Total retail	538.3		89.0		0.9		628.2
Interchange	116.0		—		—		116.0
Other	3.2		3.0		—		6.2
Total revenue from contracts with customers	657.5		92.0		0.9		750.4
Alternative revenue and other	8.7		1.8		—		10.5
Total revenues	$	666.2	$	93.8	$	0.9	$	760.9