Revenues (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

SPS’ operating revenues consists of the following:

	Three Months Ended
(Millions of Dollars)	Sept. 30, 2019		Sept. 30, 2018
Major revenue types
Revenue from contracts with customers:
Residential	$	119.3	$	114.4
C&I	222.4		229.4
Other	12.8		13.0
Total retail	354.5		356.8
Wholesale	106.6		118.0
Transmission	64.4		60.7
Other	0.6		1.8
Total revenue from contracts with customers	526.1		537.3
Alternative revenue and other	7.0		2.8
Total revenues	$	533.1	$	540.1

	Nine Months Ended
(Millions of Dollars)	Sept. 30, 2019		Sept. 30, 2018
Major revenue types
Revenue from contracts with customers:
Residential	$	277.8	$	279.5
C&I	619.6		626.0
Other	32.3		34.0
Total retail	929.7		939.5
Wholesale	263.4		326.8
Transmission	181.8		175.4
Other	2.0		12.2
Total revenue from contracts with customers	1,376.9		1,453.9
Alternative revenue and other	20.8		14.7
Total revenues	$	1,397.7	$	1,468.6