Revenues Revenues (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

NSP-Wisconsin’s operating revenues (subsequent to adoption of the revised revenue guidance) consists of the following:

	Year Ended Dec. 31, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	255.2	$	73.0	$	0.1	$	328.3
C&I	444.3		61.6		0.1		506.0
Other	6.1		—		1.1		7.2
Total retail	705.6		134.6		1.3		841.5
Interchange	157.9		—		—		157.9
Other	3.6		4.6		—		8.2
Total revenue from contracts with customers	867.1		139.2		1.3		1,007.6
Alternative revenue and other	11.5		2.4		—		13.9
Total revenues	$	878.6	$	141.6	$	1.3	$	1,021.5