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SHARE-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The following table represents PSUs and RSUs awarded by UNS Energy:
 
2017
 
2016
 
2015
PSUs
68,126

 
66,974

 
47,776

RSUs
34,063

 
33,488

 
23,888