REGULATORY MATTERS (Regulatory Assets and Liabilities Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2013
Regulatory Assets [Line Items]
Property Tax Recovery Period	6 months
TUCSON ELECTRIC POWER COMPANY
Regulatory Assets [Line Items]
Recovery Period Of Reacquired Debt	2032
Recovery Period Of Coal Contract Amendment	2017
Recovery Period for Rate Case Costs	3 years
Recovery Other Assets	2014
Minimum [Member] | TUCSON ELECTRIC POWER COMPANY
Regulatory Assets [Line Items]
Expected Life Of Mines	14 years
Maximum [Member] | TUCSON ELECTRIC POWER COMPANY
Regulatory Assets [Line Items]
Expected Life Of Mines	20 years