XML 30 R21.htm IDEA: XBRL DOCUMENT v3.22.1
Revenues (Tables)
3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue SPS’ operating revenues consisted of the following:
Three Months Ended March 31
(Millions of Dollars)20222021
Major revenue types
Revenue from contracts with customers:
Residential$97 $91 
Commercial and Industrial222 189 
Other
Total retail327 289 
Wholesale69 558 
Transmission72 71 
Other
Total revenue from contracts with customers471 920 
Alternative revenue and other14 
Total revenues$477 $934