Revenues

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Revenues

Revenue is classified by the type of goods/services rendered and market/customer type. NSP-Minnesota’s operating revenues consisted of the following:

	Year Ended Dec. 31, 2019
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,280.2	$	303.0	$	30.1	$	1,613.3
C&I	2,054.3		228.6		—		2,282.9
Other	32.9		—		3.8		36.7
Total retail	3,367.4		531.6		33.9		3,932.9
Wholesale	210.1		—		—		210.1
Transmission	216.0		—		—		216.0
Interchange	458.7		—		—		458.7
Other	11.9		9.8		—		21.7
Total revenue from contracts with customers	4,264.1		541.4		33.9		4,839.4
Alternative revenue and other	242.5		29.9		—		272.4
Total revenues	$	4,506.6	$	571.3	$	33.9	$	5,111.8

	Year Ended Dec. 31, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,308.4	$	308.8	$	27.2	$	1,644.4
C&I	2,052.1		239.3		0.2		2,291.6
Other	36.5		—		3.4		39.9
Total retail	3,397.0		548.1		30.8		3,975.9
Wholesale	189.2		—		—		189.2
Transmission	238.1		—		—		238.1
Interchange	473.7		—		—		473.7
Other	28.3		11.7		—		40.0
Total revenue from contracts with customers	4,326.3		559.8		30.8		4,916.9
Alternative revenue and other	181.7		23.3		—		205.0
Total revenues	$	4,508.0	$	583.1	$	30.8	$	5,121.9