Revenues (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

SPS’ operating revenues consisted of the following:

	Three Months Ended Sept. 30
(Millions of Dollars)	2021		2020
Major revenue types
Revenue from contracts with customers:
Residential	$	126	$	121
C&I	241		219
Other	11		13
Total retail	378		353
Wholesale	109		109
Transmission	75		74
Other	2		1
Total revenue from contracts with customers	564		537
Alternative revenue and other	11		78
Total revenues	$	575	$	615

	Nine Months Ended Sept. 30
(Millions of Dollars)	2021		2020
Major revenue types
Revenue from contracts with customers:
Residential	$	302	$	278
C&I	631		552
Other	30		30
Total retail	963		860
Wholesale	785		264
Transmission	218		212
Other	6		3
Total revenue from contracts with customers	1,972		1,339
Alternative revenue and other	35		95
Total revenues	$	2,007	$	1,434