v3.26.3
Revenues
 9 Months Ended
Sep. 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 Sept. 30
(Millions of Dollars)20262025
Major revenue types
Revenue from contracts with customers:
Residential$204 $153 
C&I385 359 
Other19 16 
Total retail608 528 
Wholesale27 33 
Transmission93 84 
Other1 — 
Total revenue from contracts with customers729 645 
Alternative revenue and other9 10 
Total revenues$738 $655 
Nine Months Ended Sept. 30
(Millions of Dollars)20262025
Major revenue types
Revenue from contracts with customers:
Residential$373 $362 
C&I877 936 
Other40 39 
Total retail1,290 1,337 
Wholesale76 81 
Transmission263 238 
Other4 2 
Total revenue from contracts with customers1,633 1,658 
Alternative revenue and other24 26 
Total revenues$1,657 $1,684