Annual Nonfuel Base Rate Increase

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- Definition

Counterparty estimate of reimbursement by Company

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- Definition

Customers percentage of off system sales margins.

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- Definition

Revenue from the bulk transport of high voltage power, typically over longer distances, between generating plants and distribution system including interest.

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Portion of revenue from the bulk transport of high voltage power, typically over longer distances, between generating plants and distribution systems shared with customers.

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- Definition

Electric Capacity

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- Definition

Energy Efficiency Cost Recovery Factor Recovery

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Estimated Contribution to Revenue, Remainder of Fiscal Year

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- Definition

Fuel Over And Under Materiality Threshold Percentage

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- Definition

Increase in non fuel and purchased power base rate revenues.

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- Definition

Military Base Discount Recovery Requested

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- Definition

The Company's Renewable Portfolio Standard requirement, or percentage of the Company's jurisdictional retail energy sales that must be provided with renewable resources.

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- Definition

Pre Tax Charge To Earnings Related To Litigation Settlement

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Property, Plant and Equipment, Change in Useful Life

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- Definition

Reduction In Fixed Fuel Factor Amount

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Reduction In Fixed Fuel Factor Percent

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- Definition

Retained Percentage Of Off System Sales Margins

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- Definition

Percentage of electrical transmission revenue shared with customers.

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- Definition

Transmission capacity

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- Definition

The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) estimated litigation liability extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Total interest costs incurred during the period and either capitalized or charged against earnings.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 34

-Paragraph 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-SubTopic 20

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.5-02.19(b),22(b))

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The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

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The amortization period for recovery of the individual regulatory noncurrent asset in a schedule of regulatory noncurrent assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 71

-Paragraph 9, 10

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Regulation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended				9 Months Ended		0 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended						4 Months Ended	9 Months Ended					9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Jul. 14, 2011	Jun. 30, 2011	Dec. 31, 2008	Sep. 30, 2011 TEP Transmission Agreement, per TEP Claim [Member] Maximum [Member] Tucson Electric Power Company [Member] mW	Sep. 30, 2011 TEP Transmission Agreement, per Judgement [Member] Maximum [Member] Tucson Electric Power Company [Member] mW	Dec. 03, 2008 TEP Transmission Agreement, per Judgement [Member] Tucson Electric Power Company [Member]	Sep. 30, 2008 TEP Transmission Agreement, per Judgement [Member] Tucson Electric Power Company [Member] Luna Energy Facility [Member]	Sep. 30, 2011 TEP Transmission Agreement, per Settlement [Member] Maximum [Member] Tucson Electric Power Company [Member] mW	Sep. 30, 2011 TEP Transmission Agreement, per Settlement [Member] Tucson Electric Power Company [Member]	Sep. 30, 2011 Two TEP Transmission Agreements, 2011 [Member] Maximum [Member] Tucson Electric Power Company [Member] mW	Jun. 30, 2010 Per Prior Agreement [Member] Margins Retained [Member]	Jun. 30, 2010 Per Current Agreement [Member]	Jun. 30, 2010 Per Current Agreement [Member] Margins Retained [Member]	Oct. 13, 2011 Maximum [Member] NMPRC [Member]	Oct. 13, 2011 Maximum [Member] FERC [Member]	Oct. 08, 2009 New Mexico Jurisdictional Non-Fuel And Purchased Power Base Rate [Member]	Sep. 30, 2011 New Mexico Jurisdictional Non-Fuel And Purchased Power Base Rate [Member] Palo Verde [Member] years	Sep. 30, 2008 Transmission Agreement [Member] Luna Energy Facility [Member]	Sep. 30, 2011 Renewable Procurement Plan, 2011 [Member]	Oct. 13, 2011 NMPRC [Member]	Oct. 13, 2011 FERC [Member]	Sep. 30, 2010 Natural Gas Fired Combustion Turbine Unit [Member] mW
Annual non-fuel base rate increase				$ 17.15
Customer's percentage of off-system sales margins														90.00%
Retained percentage of off-system sales margins													75.00%		10.00%
Regulatory Noncurrent Asset, Amortization Period		10-year
Reduction in fixed fuel factor, amount	19.7	19.7
Reduction in fixed fuel factor, percent	11.00%	11.00%
Fuel over and under materiality threshold percentage		4.00%
Energy Efficiency Cost Recovery Factor Recovery		8.3
Military Base Discount Recovery Requested			4.3
Electric capacity, MW																								87
Increase in non-fuel purchased power base rate revenues																		5.5
Property, Plant and Equipment, Change in Useful Life																			20
Transmission capacity, MW						400	200			170		40
Ordered refund amount								9.7
Loss contingency reserve																				7.2
Pre-tax charge to earnings																				2.5
Interest paid on refunded balance									0.9
Electrical Transmission Revenue Including Interest											5.4
Electrical transmission revenue shared with customers	0.7
Estimated Contribution to Revenue, Remainder of Fiscal Year	0.2
Percentage of electrical transmission revenue		25.00%
Counterparty estimate of reimbursement					1.5
Long-term Line of Credit																300	300					200	200
Percentage Of the Company's Jurisdictional Retail Sales which must be provided with Renewable sources																					10.00%
Line of Credit Facility, Maximum Borrowing Capacity																						$ 300	$ 300