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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of awards The following table represents RSUs awarded by Fortis for UNS Energy:
20212020
RSUs20,794 15,751 
The following table represents PSUs and RSUs awarded by UNS Energy:
202120202019
PSUs44,931 35,328 66,978 
RSUs (1)
2,401 1,918 33,489 
(1)Effective January 2020, executive officer RSU awards are issued through the 2020 Plan. Certain key employees will continue to be awarded RSUs through the 2015 Plan.