Revenues (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

NSP-Minnesota’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	$	300.1	$	113.5	$	7.4	$	421.0
Commercial and industrial	444.7		82.1		—		526.8
Other	7.9		—		1.5		9.4
Total retail	752.7		195.6		8.9		957.2
Wholesale	45.4		—		—		45.4
Transmission	55.9		—		—		55.9
Interchange	109.6		—		—		109.6
Other	1.9		1.2		—		3.1
Total revenue from contracts with customers	965.5		196.8		8.9		1,171.2
Alternative revenue and other	69.7		9.3		—		79.0
Total revenues	$	1,035.2	$	206.1	$	8.9	$	1,250.2

	Three Months Ended March 31, 2019
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	326.9	$	149.6	$	6.9	$	483.4
Commercial and industrial	467.5		108.8		—		576.3
Other	8.3		—		0.9		9.2
Total retail	802.7		258.4		7.8		1,068.9
Wholesale	46.9		—		—		46.9
Transmission	60.4		—		—		60.4
Interchange	120.1		—		—		120.1
Other	4.8		1.0		—		5.8
Total revenue from contracts with customers	1,034.9		259.4		7.8		1,302.1
Alternative revenue and other	43.8		4.6		—		48.4
Total revenues	$	1,078.7	$	264.0	$	7.8	$	1,350.5