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SHARE-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of represents PSUs and RSUs awarded by UNS Energy
The following table represents PSUs and RSUs awarded by UNS Energy:
 
2019
 
2018
 
2017
PSUs
66,978

 
54,426

 
68,126

RSUs
33,489

 
27,213

 
34,063