Exhibit 99.2

UniSource Energy Corporation
2nd Quarter 2011 Supplemental Earnings Information
As of August 4, 2011

TABLE OF CONTENTS
Safe Harbor and Non-GAAP Measures			1
Revision to Financial Statements			2
Variance Explanations — Q2 and YTD			3-4
UniSource Energy and TEP O&M			5
TEP Operating Statistics			6
TEP Margin Revenues			7
UNS Electric Operating Statistics			8
UNS Gas Operating Statistics			9
Basic & Diluted Shares Outstanding			10

SAFE HARBOR AND NON-GAAP MEASURES

This document contains forward-looking information that involves risks and uncertainties, that include, but are not limited to: state and federal regulatory and legislative decisions and actions; regional economic and market conditions which could affect customer growth and energy usage; weather variations affecting energy usage; the cost of debt and equity capital and access to capital markets; the performance of the stock market and changing interest rate environment, which affect the value of the company’s pension and other postretirement benefit plan assets and the related contribution requirements and expense; unexpected increases in O&M expense; resolution of pending litigation matters; changes in accounting standards; changes in critical accounting estimates; the ongoing restructuring of the electric industry; changes to long-term contracts; the cost of fuel and power supplies; performance of TEP’s generating plants; and other factors listed in UniSource Energy’s Form 10-K and 10-Q filings with the Securities and Exchange Commission. The preceding factors may cause future results to differ materially from historical results or from outcomes currently expected by UniSource Energy. The forecast assumptions and estimates below are not intended to be a full list of factors which could cause UniSource Energy’s future results to differ from current expectations. Please refer to UniSource Energy’s SEC filings for more information regarding risks and other uncertainties that could cause current expectations to differ from future results.

The Company’s press releases and other communications may include certain non-Generally Accepted Accounting Principles (GAAP) financial measures. A “non-GAAP financial measure” is defined as a numerical measure of a company’s financial performance, financial position or cash flows that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP in the Company’s financial statements.

Non-GAAP financial measures utilized by the Company include presentations of revenues, operating expenses, operating income and earnings (loss) per share. The Company uses these non-GAAP measures to evaluate the operations of the Company. Certain non-GAAP financial measures utilized by the Company exclude: the impact of non-recurring items: the effect of accounting changes or adjustments; expenses that are reimbursed by third parties; and other items. The Company’s management believes that these non-GAAP financial measures provide useful information to investors by removing the effect of variances in GAAP reported results of operations that are not indicative of fundamental changes in the earnings or cash flow capacity of the Company’s operations. Management also believes that the presentation of the non-GAAP financial measures is largely consistent with its past practice, as well as industry practice in general, and will enable investors and analysts to compare current non-GAAP measures with non-GAAP measures with respect to prior periods.

REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS

During the first half of 2011, we identified errors related to amounts owed to/from TEP for electricity deliveries settled or to be settled in-kind during prior years and in prior years the calculation of income tax expense. The calculation of income tax expense did not treat Allowance for Equity Funds Used During Construction (AFUDC) as a permanent book to tax difference. We assessed the materiality of these errors on prior period financial statements and concluded they were not material to any prior annual or interim periods, but the cumulative impact could be material to the annual period ended December 31, 2011 and the interim period ended June 30, 2011, if corrected in 2011. As a result, in accordance with Staff Accounting Bulletin 108, we have revised our prior period financial statements as described below to correct these errors.

The income tax adjustment impacted fiscal years 2003 through 2010 for UniSource Energy and fiscal years 2009 and 2010 for TEP. The adjustment for electricity deliveries settled or to be settled in-kind impacted fiscal years 2004 through 2010. The revision increased net income for UniSource Energy and TEP by $1 million for both the 2010 and 2009 annual periods. UniSource Energy Accumulated Earnings increased by $5 million for the periods prior to January 1, 2009 as a result of the revision. For more information, please refer to UniSource Energy’s and TEP’s 2^nd quarter SEC Form 10-Q, which is expected to be filed on or before August 9, 2011.

UNISOURCE ENERGY 2ND QUARTER EARNINGS VARIANCE EXPLANATION

2nd Quarter 2010 UniSource Energy Net Income						$	25.9

		2nd Quarter								Change
		2011				2010				Pre-Tax				After Tax
TEP		-millions of dollars-
Retail Margin Revenues		$	139.0			$	136.5			$	2.5			$	1.5
L-T Wholesale Margin Revenues			4.2				6.9				(2.7	)			(1.7	)
Transmission Revenues			4.4				3.7				0.7				0.4
TEP Utility Gross Margin (Non-GAAP)			147.6				147.1			$	0.5				0.3
Base O&M			56.1				55.6				0.5				0.3
Depreciation			25.9				24.9				1.0				0.6
Amortization			8.2				8.0				0.2				0.1
Operating synergies related to Springerville Units 3&4			6.4				6.0				0.4				0.2
Other Income			(0.2	)			0.4				(0.6	)			(0.4	)
Total Interest Expense			22.0				21.6				0.4				0.2
Other Line Item Changes			(1.4	)			(0.8	)			(0.6	)			(0.4	)
Income Tax Expense (Benefit)			15.1				14.7			NM					0.4
TEP Net Income (GAAP)		$	25.1			$	27.9			NM					($2.8	)

Change in TEP Net Income							(2.8	)

Other Business Segments — After Tax Amounts
UNS Electric Net Income			2.9				2.1			NM					0.8
UNS Gas Net Income			0.4				0.6			NM					(0.2	)
Other Non-Reportable Segments and Consolidating Adj. (1)			0.2				(4.7	)		NM					4.9
Total Other Income and Consolidating Adjustments			3.5				(2.0	)		NM					5.5

Change in UNS Electric, UNS Gas and Other							5.5
2nd Quarter 2011 UniSource Energy Net Income						$	28.6

Note: Some columns and rows may not foot due to rounding.

3 — Q2 Variance Explanation

UNISOURCE ENERGY YEAR-TO-DATE EARNINGS VARIANCE EXPLANATION

YTD June 30, 2010 UniSource Energy Net Income		$	46.0

		YTD June 30,								Change
		2011				2010				Pre-Tax				After Tax
TEP		-millions of dollars-
Retail Margin Revenues		$	247.8			$	245.0			$	2.8			$	1.7
L-T Wholesale Margin Revenues			11.1				14.9				(3.8	)			(2.4	)
Transmission Revenues			8.3				11.2				(2.9	)			(1.8	)
TEP Utility Gross Margin (Non-GAAP)			267.2				271.1			$	(3.9	)			(2.4	)
Loss related to the settlement of a dispute over transactions with the California Power Exchange (CPX)			0.0				(3.0	)			3.0				1.9
Base O&M			118.1				109.8				8.3				5.1
Depreciation			51.6				48.9				2.7				1.7
Amortization			16.5				15.8				0.7				0.4
Operating synergies related to Springerville Units 3&4			12.2				12.5				(0.3	)			(0.2	)
Other Income			0.7				0.8				(0.1	)			(0.1	)
Total Interest Expense			43.4				43.6				(0.2	)			(0.1	)
Other Line Item Changes			(3.1	)			(3.9	)			0.8				0.5
Income Tax Expense (1)			17.6				21.0			NM					(3.4	)
TEP Net Income (GAAP)		$	29.8			$	38.4			NM				$	(8.6	)

Change in TEP Net Income			(8.6	)

Other Business Segments — After Tax Amounts
UNS Electric Net Income (2)			5.1				5.1			NM					0.0
UNS Gas Net Income			6.5				6.4			NM					0.1
Other Non-Reportable Segments and Consolidating Adj. (3)			0.6				(3.9	)		NM					4.5
Total Other Income and Consolidating Adjustments			12.2				7.6			NM					4.6

Change in UNS Electric, UNS Gas and Other			4.6
YTD June 30, 2011 UniSource Energy Net Income		$	42.0

Note: Some columns and rows may not foot due to rounding.

4 — YTD Variance Explanation

UNISOURCE ENERGY AND TEP O&M

		2nd Quarter								YTD June 30,
UniSource Energy		2011				2010				2011				2010
O&M Components		-millions of dollars-								-millions of dollars-
TEP Base O&M (Non-GAAP)		$	56.1			$	55.6			$	118.1			$	109.8
UNS Gas Base O&M			6.0				6.1				12.6				12.3
UNS Electric Base O&M			4.6				5.3				9.8				10.2
Consolidating Adjustments & Other			(2.1	)			(2.7	)			(4.9	)			(4.8	)
UniSource Energy Base O&M (Non-GAAP)		$	64.6			$	64.3			$	135.6			$	127.5
Reimbursed O&M Related to Springerville Units 3 and 4			16.1				13.8				32.3				26.5
O&M Related to Customer-funded Renewable Energy and DSM Programs			9.4				9.0				23.2				16.0
UniSource Energy O&M (GAAP)		$	90.1			$	87.1			$	191.1			$	170.0

		2nd Quarter								YTD June 30,
TEP		2011				2010				2011				2010
O&M Components		-millions of dollars-								-millions of dollars-
TEP Base O&M (Non-GAAP)		$	56.1			$	55.6			$	118.1			$	109.8
O&M Recorded in Other Expense			(1.8	)			(1.6	)			(3.7	)			(3.3	)
Reimbursed O&M Related to Springerville Units 3 and 4			16.1				13.8				32.3				26.5
O&M Related to Customer-funded Renewable Energy and DSM Programs			7.7				6.8				19.9				12.0
TEP O&M (GAAP)		$	78.1			$	74.6			$	166.6			$	145.0

5 — O&M

TEP — OPERATING STATISTICS

		Three Months Ended June 30,																Six Months Ended June 30,
		2011				2010				Incr (Decr)				% Change				2011				2010				Incr (Decr)				% Change
AVG. ELECTRIC CUSTOMERS
Residential			366,297				365,687				610				0.2	%			366,302				365,657				645				0.2	%
Commercial			36,021				35,861				160				0.4	%			35,969				35,838				131				0.4	%
Industrial			635				632				3				0.5	%			635				632				(6	)			-0.9	%
Mining			3				3				—				0.0	%			2				2				—				0.0	%
Other			62				62				—				0.0	%			62				62				—				0.0	%
Total			403,018				402,245				773				0.2	%			402,970				402,191				779				0.2	%
RETAIL SALES — MWH
Residential			943,138				909,808				33,330				3.7	%			1,692,117				1,664,546				27,571				1.7	%
Commercial			517,712				508,991				8,721				1.7	%			918,846				903,598				15,248				1.7	%
Industrial			531,746				535,880				(4,134	)			-0.8	%			1,021,516				1,009,651				11,865				1.2	%
Mining			271,914				271,114				800				0.3	%			536,904				532,151				4,753				0.9	%
Other			67,053				68,211				(1,158	)			-1.7	%			116,916				112,870				4,046				3.6	%
Total			2,331,563				2,294,004				37,559				1.6	%			4,286,299				4,222,816				63,483				1.5	%
RETAIL USAGE — KWH/CUSTOMER
Residential			2,575				2,488				87				3.5	%			4,619				4,552				67				1.5	%
Commercial			14,373				14,193				179				1.3	%			25,545				24,740				806				3.3	%
Industrial			837,395				847,911				(10,516	)			-1.2	%			1,608,687				1,597,549				11,138				0.7	%
Mining			90,638,000				90,371,333				266,667				0.3	%			268,452,000				266,075,500				2,376,500				0.9	%
Other			1,081,500				1,100,177				(18,677	)			-1.7	%			1,885,742				1,820,484				65,258				3.6	%
Total			5,785				5,703				82				1.4	%			10,637				10,500				137				1.3	%
WEATHER — COOLING DEGREE DAYS
Actual			390				395				(5	)			-1.3	%			390				395				(5	)			-1.3	%
10-Year Average			444				455												445				456
% Change Actual vs. 10-Year Avg.			-12.2	%			-13.2	%											-12.4	%			-13.4	%
ENERGY MARKET INDICATORS
Avg. Wholesale Power Prices
Palo Verde Index — $/MWh
On Peak		$	36.39			$	35.65			$	0.74				2.1	%		$	34.50			$	40.42			$	(5.92	)			-14.6	%
Off Peak		$	14.88			$	24.01			$	(9.13	)			-38.0	%		$	18.15			$	29.39			$	(11.24	)			-38.2	%
Avg. Natural Gas Prices
Permian Index — $/MMBtu		$	4.11			$	3.85			$	0.26				6.8	%		$	4.02			$	4.55			$	(0.53	)			-11.6	%

6 — TEP Operating State

TEP — RETAIL AND WHOLESALE MARGIN REVENUES

		Three Months Ended June 30,																Six Months Ended June 30,
		2011				2010				Incr (Decr)				% Change				2011				2010				Incr (Decr)				% Change
RETAIL REVENUES — $ MILLIONS
Margin Revenues:
Residential		$	61.3			$	59.3				2.0				3.4	%		$	108.3				106.6				1.7				1.6	%
Commercial			42.5				41.7				0.8				1.9	%			73.5				72.3				1.2				1.7	%
Industrial			23.9				24.3				(0.4	)			-1.6	%			44.5				45.3				(0.8	)			-1.8	%
Mining			7.9				7.8				0.1				1.3	%			15.6				15.1				0.5				3.3	%
Other			3.4				3.4				—				0.0	%			5.9				5.7				0.2				3.5	%
Total		$	139.0			$	136.5			$	2.5				1.8	%		$	247.8			$	245.0			$	2.8				1.1	%
DSM / REST			9.1				10.0				(0.9	)			-9.0	%			24.1				17.9				6.2				34.6	%
Fuel Revenues:
Recovered from Customers			83.6				71.1				12.5				17.6	%			133.5				122.1				11.4				9.3	%
Total Retail Revenues		$	231.7			$	217.6			$	14.1				6.5	%		$	405.4			$	385.0			$	20.4				5.3	%
RETAIL REVENUES — CENTS / KWH
Margin Revenues:
Residential			6.50				6.52				(0.02	)			-0.3	%			6.40				6.40				(0.00	)			-0.1	%
Commercial			8.21				8.19				0.02				0.2	%			8.00				8.00				(0.00	)			0.0	%
Industrial			4.49				4.53				(0.04	)			-0.9	%			4.36				4.49				(0.13	)			-2.9	%
Mining			2.91				2.88				0.03				1.0	%			2.91				2.84				0.07				2.4	%
Other			5.07				4.98				0.09				1.7	%			5.05				5.05				(0.00	)			-0.1	%
Total			5.96				5.95				0.01				0.2	%			5.78				5.80				(0.02	)			-0.4	%
DSM / REST			0.39				0.44				(0.05	)			-10.5	%			0.56				0.42				0.14				32.6	%
Fuel Revenues:
Recovered from Customers			3.59				3.10				0.49				15.7	%			3.11				2.89				0.22				7.7	%
Total Retail Revenues			9.94				9.49				0.45				4.8	%			9.46				9.12				0.34				3.7	%
LONG-TERM WHOLESALE MARGIN — $ MILLIONS
Long-term Wholesale Revenues		$	10.4			$	13.0				(2.6	)			-20.0	%		$	23.9			$	27.9				(4.0	)			-14.3	%
Fuel and Purchased Power Expense			6.2				6.1				0.1				1.6	%			12.8				13.0				(0.2	)			-1.3	%
Net		$	4.2			$	6.9				(2.7	)			-39.1	%		$	11.1			$	14.9				(3.8	)			-25.7	%

7 — TEP Margin Revenues

UNS ELECTRIC — OPERATING STATISTICS

		Three Months Ended June 30,																Six Months Ended June 30,
		2011				2010				Incr (Decr)				% Change				2011				2010				Incr (Decr)				% Change
AVG. ELECTRIC CUSTOMERS
Residential			80,555				80,209				346				0.4	%			80,551				80,116				435				0.5	%
Commercial			10,384				10,352				32				0.3	%			10,376				10,344				32				0.3	%
Industrial			22				25				(3	)			-12.0	%			22				24				(2	)			-8.3	%
Mining			2				1				1				100.0	%			2				1				1				100.0	%
Other			249				266				(17	)			-6.4	%			249				266				(17	)			-6.4	%
Total			91,212				90,853				359				0.4	%			91,200				90,751				449				0.5	%
RETAIL SALES — MWH
Residential			173,265				175,921				(2,656	)			-1.5	%			353,431				351,266				2,165				0.6	%
Commercial			158,792				157,277				1,515				1.0	%			289,854				288,585				1,269				0.4	%
Industrial			54,140				51,547				2,593				5.0	%			105,891				103,381				2,510				2.4	%
Mining			63,942				51,287				12,655				24.7	%			122,672				98,139				24,533				25.0	%
Other			373				474				(101	)			-21.3	%			848				1,040				(192	)			-18.5	%
Total			450,512				436,506				14,006				3.2	%			872,696				842,411				30,285				3.6	%
RETAIL USAGE — KWH/CUSTOMER
Residential			2,151				2,193				(42	)			-1.9	%			4,388				4,384				3				0.1	%
Commercial			15,292				15,193				99				0.7	%			27,935				27,899				36				0.1	%
Industrial			2,460,909				2,061,880				399,029				19.4	%			4,813,227				4,217,125				596,102				14.1	%
Mining			31,971,000				51,287,000				(19,316,000	)			-37.7	%			61,336,000				98,139,000				(36,803,000	)			-37.5	%
Other			1,498				1,782				(284	)			-15.9	%			3,406				3,910				(504	)			-12.9	%
Total			4,939				4,805				135				2.8	%			9,569				9,259				310				3.4	%
RETAIL REVENUES — MILLIONS
Margin Revenues:
Residential		$	5.4			$	6.0				(0.6	)			-10.0	%		$	11.0			$	10.5				0.5				4.8	%
Commercial			6.6				5.8				0.8				13.8	%			12.2				10.8				1.4				13.2	%
Industrial			1.8				1.7				0.1				5.9	%			3.7				3.5				0.2				5.7	%
Mining			1.4				1.1				0.3				27.3	%			2.7				2.0				0.7				35.0	%
Other			0.2				0.2				—				0.0	%			0.3				0.3				—				0.0	%
Total Margin Revenues		$	15.4			$	14.8			$	0.6				4.1	%		$	29.9			$	27.1			$	2.8				10.4	%
DSM / REST			1.5				2.0				(0.5	)			-25.0	%			2.9				3.6				(0.7	)			-19.8	%
Fuel Revenues:
Recovered from Customers			27.1				25.6				1.5				5.9	%			54.7				49.0				5.7				11.6	%
Total Retail Revenues		$	44.0			$	42.4			$	1.6				3.8	%		$	87.5			$	79.7			$	7.8				9.7	%
WEATHER — COOLING DEGREE DAYS
Actual			2,644				2,437				207				8.5	%			2,746				2,477				269				10.9	%
10-Year Average			2,854				2,918												2,965				3,029
% Change Actual vs. 10-Year Avg.			-7.4	%			-16.5	%											-7.4	%			-18.2	%

8 — UNS Electric Op. Stats

UNS GAS — OPERATING STATISTICS

		Three Months Ended June 30,																Six Months Ended June 30,
		2011				2010				Incr (Decr)				% Change				2011				2010				Incr (Decr)				% Change
AVG. GAS CUSTOMERS
Residential			134,008				133,135				873				0.7	%			134,217				133,425				792				0.6	%
Commercial			11,226				11,260				(34	)			-0.3	%			11,266				11,332				(66	)			-0.6	%
Industrial			22				23				(1	)			-4.3	%			22				23				(1	)			-4.3	%
All Other			1,120				1,092				28				2.6	%			1,113				1,090				23				2.1	%
Total			146,376				145,510				866				0.6	%			146,618				145,870				748				0.5	%
RETAIL SALES — THOUSANDS OF THERMS
Residential			10,211				11,151				(940	)			-8.4	%			42,981				44,553				(1,572	)			-3.5	%
Commercial			5,386				5,576				(190	)			-3.4	%			16,845				17,021				(177	)			-1.0	%
Industrial			496				360				136				37.8	%			1,236				1,052				184				17.5	%
All Other			902				978				(76	)			-7.8	%			3,963				4,113				(150	)			-3.6	%
Total			16,996				18,065				(1,070	)			-5.9	%			65,025				66,739				(1,714	)			-2.6	%
RETAIL USAGE — THERMS/CUSTOMER
Residential			76				84				(8	)			-9.0	%			320				334				(14	)			-4.1	%
Commercial			480				495				(15	)			-3.1	%			1,495				1,502				(7	)			-0.5	%
Industrial			22,525				15,640				6,885				44.0	%			56,186				45,742				10,443				22.8	%
All Other			806				881				(76	)			-8.6	%			3,561				3,712				(151	)			-4.1	%
Total			116				124				(8	)			-6.5	%			444				457				(14	)			-3.1	%
RETAIL REVENUES — MILLIONS
Margin Revenues:
Residential		$	7.3			$	7.7				(0.4	)			-4.9	%		$	21.7			$	21.8				(0.0	)			0.0	%
Commercial			2.0				2.1				(0.1	)			-3.6	%			5.7				5.5				0.2				3.4	%
All Other			0.3				0.3				0.0				11.3	%			1.3				1.2				0.1				7.4	%
Total Margin Revenues		$	9.7			$	10.1			$	(0.4	)			-4.2	%		$	28.8			$	28.5			$	0.3				0.9	%
DSM Revenues			0.3				0.2				0.1				71.0	%			0.6				0.4			$	0.2				47.0	%
Transport/NSP Revenues			4.3				3.2				1.1				33.2	%			9.0				8.4			$	0.6				7.5	%
Fuel Revenues:
Recovered from Customers			11.4				11.9				(0.5	)			-4.2	%			44.8				44.8				(0.0	)			-0.1	%
Total Gas Revenues		$	25.7			$	25.4			$	0.3				1.0	%		$	83.1			$	82.1			$	1.0				1.3	%
WEATHER — HEATING DEGREE DAYS
Actual			2,728				3,040				(312	)			-10.3	%			12,840				13,396				(556	)			-4.2	%
10-Year Average			2,760				2,433												12,862				12,408
% Change Actual vs. 10-Year Avg.			-1.2	%			24.9	%											-0.2	%			8.0	%