v3.24.0.1
Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 08, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-5924    
Entity Registrant Name TUCSON ELECTRIC POWER CO    
Entity Incorporation, State or Country Code AZ    
Entity Tax Identification Number 86-0062700    
Entity Address, Address Line One 88 East Broadway Boulevard    
Entity Address, City or Town Tucson    
Entity Address, State or Province AZ    
Entity Address, Postal Zip Code 85701    
City Area Code 520    
Local Phone Number 571-4000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   32,139,434  
Documents Incorporated by Reference None    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000100122