CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total USD ($)	TUCSON ELECTRIC POWER COMPANY USD ($)	Common Shares Outstanding [Member]	Common Stock [Member] USD ($)	Common Stock [Member] TUCSON ELECTRIC POWER COMPANY USD ($)	Capital Stock Expense [Member] TUCSON ELECTRIC POWER COMPANY USD ($)	Retained Earnings [Member] USD ($)	Retained Earnings [Member] TUCSON ELECTRIC POWER COMPANY USD ($)	Accumulated Other Comprehensive Loss [Member] USD ($)	Accumulated Other Comprehensive Loss [Member] TUCSON ELECTRIC POWER COMPANY USD ($)
Balances at Dec. 31, 2013	$ 1,130,784	$ 925,923		$ 889,301	$ 888,971	$ (6,357)	$ 247,532	$ 49,185	$ (6,049)	$ (5,876)
Balances, shares at Dec. 31, 2013			41,538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	15,475	9,172					15,475	9,172
Other Comprehensive Loss, net of tax	517	505							517	505
Dividends Declared	(20,186)						(20,186)
Shares Issued for Stock Options, shares			20
Shares Issued for Stock Options	594			594
Shares Issued Under Performance Share Awards, shares			101
Shares Issued Under Performance Share Awards	0			0
Share-based Compensation	(1,360)			(1,360)
Balances at Mar. 31, 2014	$ 1,125,824	$ 935,600		$ 888,535	$ 888,971	$ (6,357)	$ 242,821	$ 58,357	$ (5,532)	$ (5,371)
Balances, shares at Mar. 31, 2014			41,659