v3.26.1
Revenues
 6 Months Ended
Jun. 30, 2026
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)20262025
Major revenue types
Revenue from contracts with customers:
Residential$71 $95 
C&I (a)
194 289 
Other10 12 
Total retail275 396 
Wholesale19 23 
Transmission86 78 
Other2 1 
Total revenue from contracts with customers382 498 
Alternative revenue and other7 10 
Total revenues$389 $508 
(a)For the three months ended June 30, 2026 and 2025, revenues from one C&I customer represented approximately 10.2% and 10.1% of total revenues, respectively.
Six Months Ended June 30
(Millions of Dollars)20262025
Major revenue types
Revenue from contracts with customers:
Residential$169 $209 
C&I492 577 
Other21 23 
Total retail682 809 
Wholesale49 48 
Transmission170 154 
Other3 2 
Total revenue from contracts with customers904 1,013 
Alternative revenue and other15 16 
Total revenues$919 $1,029