CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Revenues
Electric Domestic Regulated Revenue	$ 362,244	$ 353,473	$ 868,523	$ 850,975
Sales Revenue from Energy Commodities and Services	27,529	29,341	92,581	88,469
Gas Retail Sales	15,430	15,407	86,432	85,621
Other Revenue, Net	31,838	35,887	86,863	88,427
Revenues	437,041	434,108	1,134,399	1,113,492
Operating Expenses
Utilities Operating Expense, Fuel Used	85,102	92,873	253,249	245,933
Utilities Operating Expense, Purchased Power	67,429	57,085	189,384	165,078
Cost of Transmission	8,061	4,500	15,768	10,738
Increase (Decrease) to Reflect PPFAC Recovery	(3,521)	18,076	(6,814)	29,730
Cost of Goods and Services, Energy Commodities and Services	157,071	172,534	451,587	451,479
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses	93,202	98,346	278,245	283,587
Cost of Services, Depreciation	38,204	35,145	111,175	105,319
Amortization of Deferred Charges	5,193	9,069	21,600	26,845
Taxes, Miscellaneous	13,606	12,605	41,329	37,385
Operating Expenses	307,276	327,699	903,936	904,615
Operating Income (Loss)	129,765	106,409	230,463	208,877
Other Income (Deductions)
Investment Income, Interest	2	340	31	981
Other Nonoperating Income	2,044	1,011	5,545	3,855
Other Nonoperating Expense	(438)	(752)	(1,817)	(1,508)
Life Insurance, Corporate or Bank Owned, Change in Value	731	581	1,864	1,621
Nonoperating Income (Expense)	2,339	1,180	5,623	4,949
Interest and Debt Expense [Abstract]
Interest Expense, Debt	17,580	17,074	53,534	53,811
Interest Expense, Lessee, Assets under Capital Lease	6,323	8,507	18,821	25,105
Interest Expense, Other	230	692	183	1,712
Interest Costs Capitalized	(933)	(459)	(2,352)	(1,646)
Interest Expense	23,200	25,814	70,186	78,982
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	108,904	81,775	165,900	134,844
Income Tax Expense (Benefit)	40,914	31,111	51,947	51,430
Net Income	67,990	50,664	113,953	83,414
Weighted-Average Shares of Common Stock Outstanding (000)
Basic	41,650	41,446	41,596	39,983
Diluted	42,028	41,863	41,941	41,719
Earnings Per Share
Basic	$ 1.63	$ 1.22	$ 2.74	$ 2.09
Diluted	$ 1.62	$ 1.21	$ 2.72	$ 2.03
Dividends Declared Per Share	$ 0.435	$ 0.43	$ 1.305	$ 1.29
TUCSON ELECTRIC POWER COMPANY
Operating Revenues
Electric Domestic Regulated Revenue	310,632	302,893	739,147	716,993
Sales Revenue from Energy Commodities and Services	26,563	25,448	90,503	77,488
Other Revenue, Net	34,044	38,569	93,603	95,826
Revenues	371,239	366,910	923,253	890,307
Operating Expenses
Utilities Operating Expense, Fuel Used	82,065	88,402	247,417	237,930
Utilities Operating Expense, Purchased Power	42,477	27,576	89,815	62,064
Cost of Transmission	4,940	1,914	7,535	4,277
Increase (Decrease) to Reflect PPFAC Recovery	(7,992)	20,025	(5,079)	25,150
Cost of Goods and Services, Energy Commodities and Services	121,490	137,917	339,688	329,421
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses	79,335	86,942	239,170	248,092
Cost of Services, Depreciation	30,311	27,644	87,729	82,656
Amortization of Deferred Charges	6,118	10,001	24,393	29,621
Taxes, Miscellaneous	10,808	10,327	32,916	30,325
Operating Expenses	248,062	272,831	723,896	720,115
Operating Income (Loss)	123,177	94,079	199,357	170,192
Other Income (Deductions)
Investment Income, Interest	6	28	14	97
Other Nonoperating Income	1,466	952	3,904	3,041
Other Nonoperating Expense	(2,776)	(1,945)	(7,493)	(4,886)
Life Insurance, Corporate or Bank Owned, Change in Value	731	581	1,864	1,621
Nonoperating Income (Expense)	(573)	(384)	(1,711)	(127)
Interest and Debt Expense [Abstract]
Interest Expense, Debt	13,848	13,268	42,412	40,562
Interest Expense, Lessee, Assets under Capital Lease	6,323	8,507	18,821	25,105
Interest Expense, Other	82	562	(86)	1,338
Interest Costs Capitalized	(644)	(361)	(1,671)	(1,381)
Interest Expense	19,609	21,976	59,476	65,624
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	102,995	71,719	138,170	104,441
Income Tax Expense (Benefit)	38,828	27,150	41,737	39,423
Net Income	64,167	44,569	96,433	65,018
Retained Earnings [Member]
Interest and Debt Expense [Abstract]
Net Income			113,953
Retained Earnings [Member] | TUCSON ELECTRIC POWER COMPANY
Interest and Debt Expense [Abstract]
Net Income			$ 96,433