Comparative Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	6 Months Ended	12 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2010	Dec. 31, 2010	Jun. 30, 2011	Jun. 30, 2011 TEP [Member]		Dec. 31, 2010 TEP [Member]
Utility Plant
Plant in Service		$ 4,452,928	$ 4,579,098	$ 3,964,305		$ 3,863,431
Utility Plant under Capital Leases		583,374	582,669	582,669		582,669
Construction Work in Progress		210,971	225,002
Construction Work in Progress				153,957		153,981
Total Utility Plant		5,247,273	5,386,769	4,700,931		4,600,081
Less Accumulated Depreciation and Amortization		(1,824,843)	(1,858,069)	(1,751,571)		(1,729,747)
Less Accumulated Amortization of Capital Lease Assets		(460,932)	(468,403)	(468,403)		(460,257)
Total Utility Plant - Net		2,961,498	3,060,297	2,480,957		2,410,077
Investments and Other Property
Investments in Lease Debt and Equity		103,844	66,376	66,376		103,844
Other		61,676	39,762	36,711		43,588
Total Investments and Other Property		165,520	106,138	103,087		147,432
Current Assets
Cash and Cash Equivalents	61,409	67,599	97,779	34,322		19,983
Accounts Receivable - Customer		91,556	94,618	76,988		71,425
Unbilled Accounts Receivable		53,084	58,183	47,640		32,217
Allowance for Doubtful Accounts		(6,125)	(6,003)	(4,043)	[1]	(4,106)
Accounts Receivable - Due from Affiliates				2,314		5,442
Fuel Inventory		29,216	28,636	28,340		29,209
Materials and Supplies		65,832	67,093	55,272		54,732
Derivative Instruments		5,214	7,300	1,656		1,318
Regulatory Assets - Current		56,962	71,390	57,485		34,023
Deferred Income Taxes - Current		32,386	34,839	35,723		33,640
Other		30,092	38,391	21,369		26,467
Total Current Assets		425,816	492,226	357,066		304,350
Regulatory and Other Assets
Regulatory Assets - Noncurrent		196,736	166,311	156,345		186,074
Derivative Instruments		9,806	6,946	2,574		1,834
Other Assets		30,425	28,027	22,940		24,767
Total Regulatory and Other Assets		236,967	201,284	181,859		212,675
Total Assets		3,789,801	3,859,945	3,122,969		3,074,534
Capitalization
Common Stock Equity		828,368	847,095	736,916		707,495
Capital Lease Obligations		429,074	364,635	364,635		429,074
Long-Term Debt		1,352,977	1,370,615	1,003,615		1,003,615
Total Capitalization		2,610,419	2,582,345	2,105,166		2,140,184
Current Liabilities
Current Obligations Under Capital Leases		60,347	76,261	76,261		60,309
Borrowing Under Revolving Credit Facility		0	50,000	50,000		0
Current Maturities of Long-Term Debt		57,000	76,643
Accounts Payable - Trade		109,896	123,508	98,251		77,967
Accounts Payable - Due to Affiliates				3,757		3,989
Interest Accrued		39,120	23,812	16,358		31,771
Accrued Taxes Other Than Income Taxes		39,140	39,593	32,695		29,873
Accrued Employee Expenses		26,969	25,167	22,016		23,710
Customer Deposits		29,795	31,622	22,726		21,191
Regulatory Liabilities - Current		69,483	58,294	44,182		58,936
Derivative Instruments		30,574	24,861	6,450		7,288
Other		1,678	4,696	4,469		3,379
Total Current Liabilities		464,002	534,457	377,165		318,413
Deferred Credits and Other Liabilities
Deferred Income Taxes - Noncurrent		246,466	268,265	241,409		227,615
Regulatory Liabilities - Noncurrent		201,329	219,370	186,135		170,223
Derivative Instruments		22,969	19,147	12,055		11,650
Pension and Other Postretirement Benefits		127,343	126,401	119,635		120,590
Other		117,273	109,960	81,404		85,859
Total Deferred Credits and Other Liabilities		715,380	743,143	640,638		615,937
Commitments, Contingencies and Proposed Environmental Matters (Note 6)
Total Capitalization and Other Liabilities		$ 3,789,801	$ 3,859,945	$ 3,122,969		$ 3,074,534

[1] TEP and UNS Electric sell power to each other at prices based on the Dow Jones Four Corners Daily Index.