Revenues (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

SPS’ operating revenues consists of the following:

	Three Months Ended
(Millions of Dollars)	March 31, 2019		March 31, 2018
Major revenue types
Revenue from contracts with customers:
Residential	$	88.1	$	80.0
C&I	205.8		195.8
Other	9.6		9.7
Total retail	303.5		285.5
Wholesale	84.8		93.2
Transmission	57.4		55.7
Other	1.0		7.5
Total revenue from contracts with customers	446.7		441.9
Alternative revenue and other	7.4		5.3
Total revenues	$	454.1	$	447.2