Revenues

3 Months Ended

Mar. 31, 2024

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)	2024		2023
Major revenue types
Revenue from contracts with customers:
Residential	$	86	$	101
Commercial and Industrial (a)	217		267
Other	9		12
Total retail	312		380
Wholesale	36		45
Transmission	71		74
Total revenue from contracts with customers	419		499
Alternative revenue and other	9		9
Total revenues	$	428	$	508

(a)In 2024, revenues from one C&I customer represented approximately 10.7% of total revenues.