Revenues

3 Months Ended

Mar. 31, 2023

Revenue from Contract with Customer [Abstract]

Revenue

Revenue is classified by the type of goods/services rendered and market/customer type. SPS’ operating revenues consisted of the following:

	Three Months Ended March 31
(Millions of Dollars)	2023		2022
Major revenue types
Revenue from contracts with customers:
Residential	$	101	$	97
Commercial and Industrial	267		222
Other	12		8
Total retail	380		327
Wholesale	45		69
Transmission	74		72
Other	—		3
Total revenue from contracts with customers	499		471
Alternative revenue and other	9		6
Total revenues	$	508	$	477