Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities
Cash Receipts from Electric Retail Sales	$ 876,960	$ 848,308
Cash Receipts from Electric Wholesale Sales	137,029	138,236
Cash Receipts from Gas Sales	125,913	124,922
Cash Receipts from Operating Springerville Units 3 & 4	80,558	67,593
Cash Receipts from Gas Wholesale Sales	12,404
Performance Deposits Received	6,340	16,200
Interest Received	5,400	9,029
Income Tax Refunds Received	3,819
Other Cash Receipts	16,830	21,557
Purchased Energy Costs Paid	(246,452)	(286,314)
Payment of Other Operations and Maintenance Costs	(220,625)	(178,123)
Fuel Costs Paid	(212,791)	(182,703)
Taxes Other Than Income Taxes Paid, Net of Amounts Capitalized	(123,166)	(106,701)
Wages Paid, Net of Amounts Capitalized	(92,924)	(94,490)
Interest Paid, Net of Amounts Capitalized	(56,060)	(49,751)
Capital Lease Interest Paid	(31,558)	(37,106)
Wholesale Gas Costs Paid	(11,822)
Performance Deposit Paid	(3,840)	(17,200)
Income Taxes Paid	(700)	(11,246)
Other Cash Payments	(4,828)	(6,678)
Net Cash Flows - Operating Activities	260,487	255,533
Cash Flows from Investing Activities
Capital Expenditures	(263,153)	(208,042)
Purchase of Sundt Unit 4 Lease Asset		(51,389)
Purchase of Intangibles - Renewable Energy Credits	(4,102)	(6,241)
Prepayment Deposit on UED Debt		(3,188)
Other Cash Payments	(578)	(820)
Return of Investment in Springerville Lease Debt	38,353	25,615
Proceeds from Sale of Land and Buildings	2,512
Other Cash Receipts	11,050	10,933
Net Cash Flows - Investing Activities	(215,918)	(233,132)
Cash Flows from Financing Activities
Proceeds from Borrowings Under Revolving Credit Facility	238,000	231,000
Proceeds from Issuance of Long-Term Debt	91,080	39,570
Proceeds from Stock Options Exercised	7,487	8,896
Other Cash Receipts	3,057	8,777
Repayments of Borrowings Under Revolving Credit Facilities	(189,000)	(199,000)
Payments of Capital Lease Obligations	(74,381)	(55,970)
Repayment of Long-Term Debt	(79,665)	(19,445)
Common Stock Dividends Paid	(46,382)	(42,326)
Payment of Debt Issue/Retirement Costs	(759)	(2,099)
Other Cash Payments	(1,168)	(1,827)
Net Cash Flows - Financing Activities	(51,731)	(32,424)
Net Increase (Decrease) in Cash and Cash Equivalents	(7,162)	(10,023)
Cash and Cash Equivalents, Beginning of Year	67,599	76,922
Cash and Cash Equivalents, End of Period	60,437	66,899
TEP [Member]
Cash Flows from Operating Activities
Cash Receipts from Electric Retail Sales	723,107	704,027
Cash Receipts from Electric Wholesale Sales	114,061	140,207
Cash Receipts from Operating Springerville Units 3 & 4	80,558	67,593
Cash Receipts from Gas Wholesale Sales	11,825
Performance Deposits Received	1,640	5,040
Reimbursement of Affiliate Charges	13,928	13,781
Interest Received	5,361	8,986
Income Tax Refunds Received	4,360	3,369
Other Cash Receipts	12,466	13,738
Payment of Other Operations and Maintenance Costs	(215,896)	(171,624)
Fuel Costs Paid	(208,675)	(173,796)
Taxes Other Than Income Taxes Paid, Net of Amounts Capitalized	(93,444)	(88,390)
Wages Paid, Net of Amounts Capitalized	(76,739)	(76,637)
Interest Paid, Net of Amounts Capitalized	(34,161)	(28,841)
Capital Lease Interest Paid	(31,558)	(37,099)
Wholesale Gas Costs Paid	(11,822)
Performance Deposit Paid	(1,640)	(5,040)
Purchased Power Costs Paid	(82,321)	(137,051)
Income Taxes Paid	(2,346)	(14,865)
Other Cash Payments	(3,160)	(2,487)
Net Cash Flows - Operating Activities	205,544	220,911
Cash Flows from Investing Activities
Capital Expenditures	(193,714)	(171,813)
Purchase of Sundt Unit 4 Lease Asset		(51,389)
Purchase of Intangibles - Renewable Energy Credits	(4,000)	(7,073)
Other Cash Payments	(558)	(1)
Return of Investment in Springerville Lease Debt	38,353	25,615
Other Cash Receipts	6,648	6,863
Net Cash Flows - Investing Activities	(153,271)	(197,798)
Cash Flows from Financing Activities
Proceeds from Borrowings Under Revolving Credit Facility	120,000	177,000
Proceeds from Issuance of Long-Term Debt	11,080	30,000
Equity Investment from UniSource Energy		15,000
Other Cash Receipts	1,051	1,831
Repayments of Borrowings Under Revolving Credit Facilities	(115,000)	(157,000)
Payments of Capital Lease Obligations	(74,343)	(55,889)
Dividends Paid to Unisource Energy	0	(30,000)
Other Cash Payments	(1,019)	(2,682)
Net Cash Flows - Financing Activities	(58,231)	(21,740)
Net Increase (Decrease) in Cash and Cash Equivalents	(5,958)	1,373
Cash and Cash Equivalents, Beginning of Year	19,983	22,418
Cash and Cash Equivalents, End of Period	$ 14,025	$ 23,791