Revenues (Tables)

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

SPS’ operating revenues consisted of the following:

	Year Ended Dec. 31
(Millions of Dollars)	2022		2021		2020
Major revenue types
Revenue from contracts with customers:
Residential	$	445	$	375	$	359
C&I	1,102		842		739
Other	51		38		39
Total retail	1,598		1,255		1,137
Wholesale	407		873		345
Transmission	296		287		279
Other	10		6		4
Total revenue from contracts with customers	2,311		2,421		1,765
Alternative revenue and other	115		44		105
Total revenues	$	2,426	$	2,465	$	1,870