CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) Share data in Thousands, unless otherwise specified	Total USD ($)	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, 2010	$ 830,756,000	$ 709,884,000		$ 715,687,000	$ 858,971,000	$ (6,357,000)	$ 124,838,000	$ (132,961,000)	$ (9,769,000)	$ (9,769,000)
Balances, shares at Dec. 31, 2010			36,542
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	109,975,000	85,334,000					109,975,000	85,334,000
Other Comprehensive Loss, net of tax	(315,000)	(275,000)							(315,000)	(275,000)
Dividends Paid to UNS Energy		0
Dividends Declared	(62,158,000)						(62,158,000)
Shares Issued for Stock Options, shares	319		319
Shares Issued for Stock Options	8,176,000			8,176,000
Shares Issued Under Performance Share Awards, shares			57
Shares Issued Under Performance Share Awards	0			0
Share-based Compensation	2,040,000			2,040,000
Payments of Dividends		30,000,000			30,000,000
Balances at Dec. 31, 2011	888,474,000	824,943,000		725,903,000	888,971,000	(6,357,000)	172,655,000	(47,627,000)	(10,084,000)	(10,044,000)
Balances, shares at Dec. 31, 2011			36,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	6,476,000	(1,461,000)
Balances at Mar. 31, 2012
Balances at Dec. 31, 2011	888,474,000	824,943,000		725,903,000		(6,357,000)	172,655,000	(47,627,000)	(10,084,000)	(10,044,000)
Balances, shares at Dec. 31, 2011			36,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	90,919,000	65,470,000					90,919,000	65,470,000
Other Comprehensive Loss, net of tax	294,000	514,000							294,000	514,000
Dividends Paid to UNS Energy		(30,000,000)						(30,000,000)
Dividends Declared	(70,457,000)						(70,457,000)
Shares Issued on Conversion of Notes and Related Tax Effect, shares			4,262
Shares Issued on Conversion of Notes and Related Tax Effect	149,805,000			149,805,000
Shares Issued for Stock Options, shares	132		133
Shares Issued for Stock Options	3,511,000			3,511,000
Shares Issued Under Performance Share Awards, shares			31
Shares Issued Under Performance Share Awards	0			0
Share-based Compensation	2,919,000			2,919,000
Balances at Dec. 31, 2012	1,065,465,000	860,927,000		882,138,000	888,971,000	(6,357,000)	193,117,000	(12,157,000)	(9,790,000)	(9,530,000)
Balances, shares at Dec. 31, 2012			41,344
Balances at Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	7,506,000	452,000
Balances at Dec. 31, 2012	1,065,465,000	860,927,000			888,971,000	(6,357,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	11,345,000	1,478,000
Balances at Mar. 31, 2013
Balances at Dec. 31, 2012	1,065,465,000	860,927,000		882,138,000	888,971,000	(6,357,000)	193,117,000	(12,157,000)	(9,790,000)	(9,530,000)
Balances, shares at Dec. 31, 2012			41,344
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	127,478,000	101,342,000					127,478,000	101,342,000
Other Comprehensive Loss, net of tax	3,741,000	3,654,000							3,741,000	3,654,000
Dividends Paid to UNS Energy		(40,000,000)						(40,000,000)
Dividends Declared	(73,063,000)						(73,063,000)
Shares Issued under Dividend Reinvestment Plan, shares			10
Shares Issued under Dividend Reinvestment Plan	464,000			464,000
Shares Issued for Stock Options, shares	127		127
Shares Issued for Stock Options	3,831,000			3,831,000
Shares Issued Under Performance Share Awards, shares			57
Shares Issued Under Performance Share Awards	0			0
Share-based Compensation	2,868,000			2,868,000
Balances at Dec. 31, 2013	1,130,784,000	925,923,000		889,301,000	888,971,000	(6,357,000)	247,532,000	49,185,000	(6,049,000)	(5,876,000)
Balances, shares at Dec. 31, 2013			41,538
Balances at Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	13,525,000	4,910,000
Balances at Dec. 31, 2013	$ 1,130,784,000	$ 925,923,000			$ 888,971,000	$ (6,357,000)