Revenues (Tables)

9 Months Ended

Sep. 30, 2024

Revenue from Contract with Customer [Abstract]

Disaggregation of 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 Sept. 30
(Millions of Dollars)	2024		2023
Major revenue types
Revenue from contracts with customers:
Residential	$	152	$	164
Commercial and Industrial	308		319
Other	14		18
Total retail	474		501
Wholesale	29		88
Transmission	80		81
Other	1		—
Total revenue from contracts with customers	584		670
Alternative revenue and other	10		7
Total revenues	$	594	$	677
	Nine Months Ended Sept. 30
(Millions of Dollars)	2024		2023
Major revenue types
Revenue from contracts with customers:
Residential	$	321	$	356
Commercial and Industrial (a)	744		843
Other	36		44
Total retail	1,101		1,243
Wholesale	95		184
Transmission	221		227
Other	2		2
Total revenue from contracts with customers	1,419		1,656
Alternative revenue and other	61		25
Total revenues	$	1,480	$	1,681

(a)For the nine months ended Sept. 30, 2024, revenues from one C&I customer represented approximately 10.1% of total revenues.