EX-21 5 c12971exv21.htm EXHIBIT 21 Exhibit 21
Exhibit 21
UniSource Energy Corporation Subsidiaries
         
    State or Other Jurisdiction of  
Subsidiary   Incorporation or Organization  
 
        
Tucson Electric Power Company (TEP)
   Arizona
TEP Subsidiaries:
        
San Carlos Resources Inc.
   Arizona
Escavada Company
   Arizona
 
        
UniSource Energy Services, Inc. (UES)
   Arizona
UES Subsidiaries:
        
UNS Electric, Inc.
   Arizona
UNS Gas, Inc.
   Arizona