CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities
Cash Receipts from Electric Retail Sales	$ 1,208,967,000	$ 1,197,390,000	$ 1,163,537,000
Cash Receipts from Electric Wholesale Sales	160,947,000	149,722,000	183,151,000
Cash Receipts from Gas Retail Sales	138,775,000	141,590,000	159,529,000
Cash Receipts from Operating Springerville Units 3 & 4	114,258,000	107,927,000	104,754,000
Cash Receipts from Gas Wholesale Sales	3,740,000	5,233,000	12,404,000
Interest Received	517,000	2,947,000	6,334,000
Income Tax Refunds Received	11,000	1,821,000	4,672,000
Performance Deposits Received	0	200,000	7,050,000
Other Cash Receipts	35,142,000	24,105,000	23,937,000
Fuel Costs Paid	(285,812,000)	(321,355,000)	(277,386,000)
Purchased Energy Costs Paid	(280,920,000)	(250,231,000)	(328,713,000)
Payment of Operations and Maintenance Costs	(260,453,000)	(291,512,000)	(295,662,000)
Taxes Other Than Income Taxes Paid, Net of Amounts Capitalized	(182,488,000)	(187,257,000)	(179,766,000)
Wages Paid, Net of Amounts Capitalized	(131,710,000)	(127,176,000)	(122,370,000)
Interest Paid, Net of Amounts Capitalized	(66,610,000)	(69,478,000)	(68,027,000)
Capital Lease Interest Paid	(22,553,000)	(28,788,000)	(32,103,000)
Income Taxes Paid	(316,000)	0	(700,000)
Performance Deposits Paid	0	(200,000)	(4,550,000)
Wholesale Gas Costs Paid	0	0	(11,822,000)
Other Cash Payments	(10,983,000)	(6,829,000)	(6,949,000)
Net Cash Flows—Operating Activities	420,512,000	348,109,000	337,320,000
Cash Flows from Investing Activities
Capital Expenditures	(325,886,000)	(307,277,000)	(374,122,000)
Purchase of Intangibles—Renewable Energy Credits	(26,948,000)	(10,317,000)	(5,992,000)
Return of Investments in Springerville Lease Debt	9,104,000	19,278,000	38,353,000
Change in Restricted Cash	4,134,000	(1,445,000)	0
Proceeds from Note Receivable	0	15,000,000	0
Other, net	5,786,000	21,862,000	14,673,000
Net Cash Flows—Investing Activities	(333,810,000)	(262,899,000)	(327,088,000)
Cash Flows from Financing Activities
Proceeds from Borrowings Under Revolving Credit Facilities	139,000,000	359,000,000	391,000,000
Repayments of Borrowings Under Revolving Credit Facilities	(108,000,000)	(381,000,000)	(351,000,000)
Payments of Capital Lease Obligations	(99,621,000)	(89,452,000)	(74,381,000)
Common Stock Dividends Paid	(72,234,000)	(69,648,000)	(61,904,000)
Proceeds from Stock Options Exercised	3,831,000	3,570,000	8,115,000
Proceeds from Common Stock Issuance	464,000	0	0
Proceeds from Issuance of Long-Term Debt	0	149,513,000	340,285,000
Repayments of Long-Term Debt	0	(9,341,000)	(252,125,000)
Equity Investment from UNS Energy	0	0	30,000,000
Other, net	818,000	(324,000)	(1,431,000)
Net Cash Provided by (Used in) Financing Activities	(135,742,000)	(37,682,000)	(1,441,000)
Cash and Cash Equivalents, Period Increase (Decrease)	(49,040,000)	47,528,000	8,791,000
Cash and Cash Equivalents, Beginning of Period	123,918,000	76,390,000	67,599,000
Cash and Cash Equivalents, End of Period	74,878,000	123,918,000	76,390,000
TUCSON ELECTRIC POWER COMPANY
Cash Flows from Operating Activities
Cash Receipts from Electric Retail Sales	1,020,903,000	1,006,926,000	963,247,000
Cash Receipts from Electric Wholesale Sales	146,880,000	124,594,000	152,618,000
Cash Receipts from Operating Springerville Units 3 & 4	114,258,000	107,927,000	104,754,000
Reimbursement of Affiliate Charges	23,468,000	20,926,000	18,448,000
Cash Receipts from Gas Wholesale Sales	3,271,000	4,652,000	11,825,000
Interest Received	509,000	2,025,000	5,367,000
Income Tax Refunds Received	77,000	493,000	7,492,000
Other Cash Receipts	25,079,000	18,850,000	19,611,000
Fuel Costs Paid	(280,639,000)	(313,742,000)	(271,975,000)
Payment of Operations and Maintenance Costs	(253,054,000)	(282,752,000)	(287,615,000)
Taxes Other Than Income Taxes Paid, Net of Amounts Capitalized	(144,849,000)	(147,859,000)	(139,728,000)
Purchased Power Costs Paid	(115,008,000)	(81,328,000)	(117,224,000)
Wages Paid, Net of Amounts Capitalized	(110,995,000)	(104,955,000)	(100,942,000)
Interest Paid, Net of Amounts Capitalized	(52,589,000)	(52,125,000)	(45,433,000)
Capital Lease Interest Paid	(22,553,000)	(28,786,000)	(32,103,000)
Income Taxes Paid	0	(1,796,000)	(2,346,000)
Wholesale Gas Costs Paid	0	0	(11,822,000)
Other Cash Payments	(8,567,000)	(5,131,000)	(5,880,000)
Net Cash Flows—Operating Activities	346,191,000	267,919,000	268,294,000
Cash Flows from Investing Activities
Capital Expenditures	(252,848,000)	(252,782,000)	(351,890,000)
Purchase of Intangibles—Renewable Energy Credits	(23,280,000)	(8,889,000)	(5,111,000)
Return of Investments in Springerville Lease Debt	9,104,000	19,278,000	38,353,000
Change in Restricted Cash	4,134,000	(1,445,000)	0
Other, net	3,228,000	15,957,000	6,637,000
Net Cash Flows—Investing Activities	(259,662,000)	(227,881,000)	(312,011,000)
Cash Flows from Financing Activities
Proceeds from Borrowings Under Revolving Credit Facilities	78,000,000	189,000,000	220,000,000
Repayments of Borrowings Under Revolving Credit Facilities	(78,000,000)	(199,000,000)	(210,000,000)
Payments of Capital Lease Obligations	(99,621,000)	(89,452,000)	(74,343,000)
Dividends Paid to UNS Energy	(40,000,000)	(30,000,000)	0
Proceeds from Issuance of Long-Term Debt	0	149,513,000	260,285,000
Repayments of Long-Term Debt	0	(6,535,000)	(172,460,000)
Equity Investment from UNS Energy	0	0	30,000,000
Other, net	(1,316,000)	(1,539,000)	(2,030,000)
Net Cash Provided by (Used in) Financing Activities	(140,937,000)	11,987,000	51,452,000
Cash and Cash Equivalents, Period Increase (Decrease)	(54,408,000)	52,025,000	7,735,000
Cash and Cash Equivalents, Beginning of Period	79,743,000	27,718,000	19,983,000
Cash and Cash Equivalents, End of Period	$ 25,335,000	$ 79,743,000	$ 27,718,000