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Revenues
 6 Months Ended
Jun. 30, 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 June 30
(Millions of Dollars)20242023
Major revenue types
Revenue from contracts with customers:
Residential$83 $91 
Commercial and Industrial219 257 
Other13 14 
Total retail315 362 
Wholesale30 51 
Transmission70 72 
Other1 2 
Total revenue from contracts with customers416 487 
Alternative revenue and other42 9 
Total revenues$458 $496 
Six Months Ended June 30
(Millions of Dollars)20242023
Major revenue types
Revenue from contracts with customers:
Residential$169 $192 
Commercial and Industrial (a)
436 524 
Other22 26 
Total retail627 742 
Wholesale66 96 
Transmission141 146 
Other1 2 
Total revenue from contracts with customers835 986 
Alternative revenue and other51 18 
Total revenues$886 $1,004 
(a)For the six months ended June 30, 2024, revenues from one C&I customer represented approximately 10.2% of total revenues.