Revenues (Tables)

12 Months Ended

Dec. 31, 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:

	Year Ended Dec. 31
(Millions of Dollars)	2024		2023			2022
Major revenue types
Revenue from contracts with customers:
Residential	$	413	$	442		$	445
C&I	1,000		1,094		(a)	1,102
Other	48		58			51
Total retail	1,461		1,594			1,598
Wholesale	116		223			407
Transmission	288		296			296
Other	5		—			10
Total revenue from contracts with customers	1,870		2,113			2,311
Alternative revenue and other	69		39			115
Total revenues	$	1,939	$	2,152		$	2,426

(a)In 2023, revenues from one C&I customer represented approximately 10.6% of total revenues.