Revenues (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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

	Three Months Ended March 31, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	65.0	$	24.5	$	—	$	89.5
C&I	100.4		19.5		—		119.9
Other	1.6		—		—		1.6
Total retail	167.0		44.0		—		211.0
Interchange	40.9		—		—		40.9
Other	0.5		0.8		—		1.3
Total revenue from contracts with customers	208.4		44.8		—		253.2
Alternative revenue and other	3.4		0.4		—		3.8
Total revenues	$	211.8	$	45.2	$	—	$	257.0

	Three Months Ended March 31, 2019
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	67.4	$	33.6	$	—	$	101.0
C&I	98.5		25.8		—		124.3
Other	1.5		—		0.1		1.6
Total retail	167.4		59.4		0.1		226.9
Interchange	44.1		—		—		44.1
Other	0.5		1.1		—		1.6
Total revenue from contracts with customers	212.0		60.5		0.1		272.6
Alternative revenue and other	3.0		0.6		—		3.6
Total revenues	$	215.0	$	61.1	$	0.1	$	276.2