Condensed Consolidated Statements of Changes in Stockholders Equity and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data		Total USD ($)	TEP [Member] USD ($)	Common Share Outstanding	Capital Stock Expense TEP [Member] USD ($)	Common Stock USD ($)	Common Stock TEP [Member] USD ($)	Accumulated Earnings USD ($)	Accumulated Earnings TEP [Member] USD ($)	Accumulated Other Comprehensive Loss USD ($)	Accumulated Other Comprehensive Loss TEP [Member] USD ($)
Beginning Balance at Jun. 30, 2010
Comprehensive Income:
2011 Year-to-Date Net Income			$ 59,673
Ending Balance at Sep. 30, 2010			726,328
Beginning Balance at Dec. 31, 2010		828,368	707,495		(6,357)	715,688	858,971	122,449	(135,350)	(9,769)	(9,769)
Beginning Balance, Shares at Dec. 31, 2010	[1]			36,542
Comprehensive Income:
2011 Year-to-Date Net Income		41,990	29,776					41,990	29,776
Unrealized Loss on Cash Flow Hedges (net of $762 income taxes)		(1,163)	(1,163)							(1,163)	(1,163)
Reclassification of Realized Losses on Cash Flow Hedges to Net Income (net of $431 income taxes)		659	659							659	659
Employee Benefit Obligations Amortization of SERP Net Prior Service Cost Included in Net Periodic Benefit Cost (net of $95 income taxes)		149	149							149	149
Total Comprehensive Income		41,635	29,421
Dividends, Including Non-Cash Dividend Equivalents		(31,095)						(31,095)
Shares Issued for Stock Options		7,030				7,030
Shares Issued for Stock Options, Shares				257
Shares Issued under Stock Compensation Plans, Shares				57
Other		1,157				1,157
Ending Balance at Jun. 30, 2011		847,095	736,916		(6,357)	723,875	858,971	133,344	(105,574)	(10,124)	(10,124)
Ending Balance, Shares at Jun. 30, 2011	[1]			36,856
Beginning Balance at Mar. 31, 2011
Comprehensive Income:
2011 Year-to-Date Net Income		28,574	25,128
Ending Balance at Jun. 30, 2011		$ 847,095	$ 736,916		$ (6,357)		$ 858,971

[1] UniSource Energy has 75 million authorized shares of Common Stock.