Revenues (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

SPS’ operating revenues consisted of the following:

	Year Ended Dec. 31
(Millions of Dollars)	2021		2020		2019
Major revenue types
Revenue from contracts with customers:
Residential	$	375	$	359	$	352
C&I	842		739		800
Other	38		39		41
Total retail	1,255		1,137		1,193
Wholesale	873		345		361
Transmission	287		279		240
Other	6		4		3
Total revenue from contracts with customers	2,421		1,765		1,797
Alternative revenue and other	44		105		29
Total revenues	$	2,465	$	1,870	$	1,826