Summary Of Significant Accounting Policies (Policy)	9 Months Ended
Sep. 30, 2011
Principles Of Consolidation And Basis Of Presentation	Principles of Consolidation and Basis of Presentation The consolidated condensed financial statements include the accounts of TECO Energy, Inc., its majority-owned and controlled subsidiaries, and the accounts of variable interest entities (VIEs) for which it is the primary beneficiary (TECO Energy or the company). TECO Energy is considered to be the primary beneficiary of VIEs if it has both 1) the power to direct the activities of a VIE that most significantly impact the entity's economic performance and 2) the obligation to absorb losses of the entity that could potentially be significant to the VIE or the right to receive benefits from the entity that could potentially be significant to the VIE. Effective Jan. 1, 2010, amended accounting standards on consolidation resulted in the reconsolidation of two projects in Guatemala. All significant intercompany balances and intercompany transactions have been eliminated in consolidation. Generally, the equity method of accounting is used to account for investments in partnerships or other arrangements in which TECO Energy is not the primary beneficiary, but is able to exert significant influence. In the opinion of management, the unaudited consolidated condensed financial statements include all adjustments that are of a recurring nature and necessary to state fairly the financial position of TECO Energy, Inc. and its subsidiaries as of Sep. 30, 2011 and Dec. 31, 2010, and the results of operations and cash flows for the periods ended Sep. 30, 2011 and 2010. The results of operations for the three month and nine month periods ended Sep. 30, 2011 are not necessarily indicative of the results that can be expected for the entire fiscal year ending Dec. 31, 2011.
Use Of Estimates	The use of estimates is inherent in the preparation of financial statements in accordance with generally accepted accounting principles (GAAP). Actual results could differ from these estimates. The year-end condensed balance sheet data was derived from audited financial statements, however this quarterly report on Form 10-Q does not include all year-end disclosures required for an annual report on Form 10-K by GAAP in the United States of America.
Revenues	Revenues As of Sep. 30, 2011 and Dec. 31, 2010, unbilled revenues of $58.1 million and $65.5 million, respectively, are included in the "Receivables" line item on the Consolidated Condensed Balance Sheets.
Accounting For Franchise Fees And Gross Receipts	Accounting for Franchise Fees and Gross Receipts The regulated utilities (Tampa Electric and Peoples Gas System (PGS)) are allowed to recover from customers certain costs incurred through rates approved by the Florida Public Service Commission (FPSC). The amounts included in customers' bills for franchise fees and gross receipt taxes are included as revenues on the Consolidated Condensed Statements of Income. These amounts totaled $28.8 million and $84.3 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $31.0 million and $90.0 million for the three and nine months ended Sep. 30, 2010. Franchise fees and gross receipt taxes payable by the regulated utilities are included as an expense on the Consolidated Condensed Statements of Income in "Taxes, other than income". These amounts totaled $28.8 million and $84.3 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $31.1 million and $89.9 million for the three and nine months ended Sep. 30, 2010.
Purchased Power	Purchased Power Tampa Electric purchases power on a regular basis to meet the needs of its customers. Tampa Electric purchased power from entities not affiliated with TECO Energy at a cost of $32.1 million and $103.2 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $45.2 million and $151.5 million for the three and nine months ended Sep. 30, 2010. Prudently incurred purchased power costs at Tampa Electric have historically been recoverable through FPSC-approved cost recovery clauses.
Cash Flows Related To Derivatives And Hedging Activities	Cash Flows Related to Derivatives and Hedging Activities The company classifies cash inflows and outflows related to derivative and hedging instruments in the appropriate cash flow sections associated with the item being hedged. In the case of heating oil swaps which are used to mitigate the fluctuations in the price of diesel fuel, the cash inflows and outflows are included in the operating section. For natural gas swaps, the cash inflows and outflows are also included in the operating section. For interest rate swaps that settle coincident with the debt issuance, the cash inflows and outflows are treated as premiums or discounts and included in the financing section of the Consolidated Condensed Statements of Cash Flows.
Tampa Electric Co [Member]
Principles Of Consolidation And Basis Of Presentation	Principles of Consolidation and Basis of Presentation Tampa Electric Company is a wholly-owned subsidiary of TECO Energy, Inc. For the purposes of its consolidated financial reporting, Tampa Electric Company is comprised of the Electric division, generally referred to as Tampa Electric, the Natural Gas division, generally referred to as PGS, and potentially the accounts of VIEs for which it is the primary beneficiary. Tampa Electric Company is considered to be the primary beneficiary of VIEs if it has both 1) the power to direct the activities of a VIE that most significantly impact the entity's economic performance and 2) the obligation to absorb losses of the entity that could potentially be significant to the VIE or the right to receive benefits from the entity that could potentially be significant to the VIE. For the periods presented, no VIEs have been consolidated (see Note 13). All significant intercompany balances and intercompany transactions have been eliminated in consolidation. In the opinion of management, the unaudited consolidated condensed financial statements include all adjustments that are of a recurring nature and necessary to state fairly the financial position of Tampa Electric Company and its subsidiaries as of Sep. 30, 2011 and Dec. 31, 2010, and the results of operations and cash flows for the periods ended Sep. 30, 2011 and 2010. The results of operations for the three month and nine month periods ended Sep. 30, 2011 are not necessarily indicative of the results that can be expected for the entire fiscal year ending Dec. 31, 2011.
Use Of Estimates	The use of estimates is inherent in the preparation of financial statements in accordance with GAAP. Actual results could differ from these estimates. The year-end consolidated condensed balance sheet data was derived from audited financial statements, however this quarterly report on Form 10-Q does not include all year-end disclosures required for an annual report on Form 10-K by GAAP in the United States of America.
Revenues	Revenues As of Sep. 30, 2011 and Dec. 31, 2010, unbilled revenues of $58.1 million and $65.5 million, respectively, are included in the "Receivables" line item on the Consolidated Condensed Balance Sheets.
Accounting For Franchise Fees And Gross Receipts	Accounting for Franchise Fees and Gross Receipts Tampa Electric and PGS are allowed to recover from customers certain costs incurred through rates approved by the FPSC. The amounts included in customers' bills for franchise fees and gross receipt taxes are included as revenues on the Consolidated Condensed Statements of Income. These amounts totaled $28.8 million and $84.3 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $31.0 million and $90.0 million for the three and nine months ended Sep. 30, 2010. Franchise fees and gross receipt taxes payable by the regulated utilities are included as an expense on the Consolidated Condensed Statements of Income in "Taxes, other than income". These amounts totaled $28.8 million and $84.3 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $31.1 million and $89.9 million for the three and nine months ended Sep. 30, 2010.
Purchased Power	Purchased Power Tampa Electric purchases power on a regular basis to meet the needs of its customers. Tampa Electric purchased power from entities not affiliated with TECO Energy at a cost of $32.1 million and $103.2 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $45.2 million and $151.5 million for the three and nine months ended Sep. 30, 2010. Prudently incurred purchased power costs at Tampa Electric have historically been recoverable through FPSC-approved cost recovery clauses.
Cash Flows Related To Derivatives And Hedging Activities	Cash Flows Related to Derivatives and Hedging Activities Tampa Electric Company classifies cash inflows and outflows related to derivative and hedging instruments in the appropriate cash flow sections associated with the item being hedged. For natural gas and ongoing interest rate swaps, the cash inflows and outflows are included in the operating section. For interest rate swaps that settle coincident with the debt issuance, the cash inflows and outflows are treated as premiums or discounts and included in the financing section of the Consolidated Condensed Statements of Cash Flows.

Summary Of Significant Accounting Policies (Policy)

9 Months Ended

Sep. 30, 2011

Principles Of Consolidation And Basis Of Presentation

Principles of Consolidation and Basis of Presentation

The consolidated condensed financial statements include the accounts of TECO Energy, Inc., its majority-owned and controlled subsidiaries, and the accounts of variable interest entities (VIEs) for which it is the primary beneficiary (TECO Energy or the company). TECO Energy is considered to be the primary beneficiary of VIEs if it has both 1) the power to direct the activities of a VIE that most significantly impact the entity's economic performance and 2) the obligation to absorb losses of the entity that could potentially be significant to the VIE or the right to receive benefits from the entity that could potentially be significant to the VIE. Effective Jan. 1, 2010, amended accounting standards on consolidation resulted in the reconsolidation of two projects in Guatemala.

All significant intercompany balances and intercompany transactions have been eliminated in consolidation. Generally, the equity method of accounting is used to account for investments in partnerships or other arrangements in which TECO Energy is not the primary beneficiary, but is able to exert significant influence. In the opinion of management, the unaudited consolidated condensed financial statements include all adjustments that are of a recurring nature and necessary to state fairly the financial position of TECO Energy, Inc. and its subsidiaries as of Sep. 30, 2011 and Dec. 31, 2010, and the results of operations and cash flows for the periods ended Sep. 30, 2011 and 2010. The results of operations for the three month and nine month periods ended Sep. 30, 2011 are not necessarily indicative of the results that can be expected for the entire fiscal year ending Dec. 31, 2011.

Use Of Estimates

The use of estimates is inherent in the preparation of financial statements in accordance with generally accepted accounting principles (GAAP). Actual results could differ from these estimates. The year-end condensed balance sheet data was derived from audited financial statements, however this quarterly report on Form 10-Q does not include all year-end disclosures required for an annual report on Form 10-K by GAAP in the United States of America.

Revenues

Revenues

As of Sep. 30, 2011 and Dec. 31, 2010, unbilled revenues of $58.1 million and $65.5 million, respectively, are included in the "Receivables" line item on the Consolidated Condensed Balance Sheets.

Accounting For Franchise Fees And Gross Receipts

Accounting for Franchise Fees and Gross Receipts

The regulated utilities (Tampa Electric and Peoples Gas System (PGS)) are allowed to recover from customers certain costs incurred through rates approved by the Florida Public Service Commission (FPSC). The amounts included in customers' bills for franchise fees and gross receipt taxes are included as revenues on the Consolidated Condensed Statements of Income. These amounts totaled $28.8 million and $84.3 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $31.0 million and $90.0 million for the three and nine months ended Sep. 30, 2010. Franchise fees and gross receipt taxes payable by the regulated utilities are included as an expense on the Consolidated Condensed Statements of Income in "Taxes, other than income". These amounts totaled $28.8 million and $84.3 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $31.1 million and $89.9 million for the three and nine months ended Sep. 30, 2010.

Purchased Power

Purchased Power

Tampa Electric purchases power on a regular basis to meet the needs of its customers. Tampa Electric purchased power from entities not affiliated with TECO Energy at a cost of $32.1 million and $103.2 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $45.2 million and $151.5 million for the three and nine months ended Sep. 30, 2010. Prudently incurred purchased power costs at Tampa Electric have historically been recoverable through FPSC-approved cost recovery clauses.

Cash Flows Related to Derivatives and Hedging Activities

The company classifies cash inflows and outflows related to derivative and hedging instruments in the appropriate cash flow sections associated with the item being hedged. In the case of heating oil swaps which are used to mitigate the fluctuations in the price of diesel fuel, the cash inflows and outflows are included in the operating section. For natural gas swaps, the cash inflows and outflows are also included in the operating section. For interest rate swaps that settle coincident with the debt issuance, the cash inflows and outflows are treated as premiums or discounts and included in the financing section of the Consolidated Condensed Statements of Cash Flows.

Tampa Electric Co [Member]

Principles Of Consolidation And Basis Of Presentation

Principles of Consolidation and Basis of Presentation

Tampa Electric Company is a wholly-owned subsidiary of TECO Energy, Inc. For the purposes of its consolidated financial reporting, Tampa Electric Company is comprised of the Electric division, generally referred to as Tampa Electric, the Natural Gas division, generally referred to as PGS, and potentially the accounts of VIEs for which it is the primary beneficiary. Tampa Electric Company is considered to be the primary beneficiary of VIEs if it has both 1) the power to direct the activities of a VIE that most significantly impact the entity's economic performance and 2) the obligation to absorb losses of the entity that could potentially be significant to the VIE or the right to receive benefits from the entity that could potentially be significant to the VIE. For the periods presented, no VIEs have been consolidated (see Note 13).

All significant intercompany balances and intercompany transactions have been eliminated in consolidation. In the opinion of management, the unaudited consolidated condensed financial statements include all adjustments that are of a recurring nature and necessary to state fairly the financial position of Tampa Electric Company and its subsidiaries as of Sep. 30, 2011 and Dec. 31, 2010, and the results of operations and cash flows for the periods ended Sep. 30, 2011 and 2010. The results of operations for the three month and nine month periods ended Sep. 30, 2011 are not necessarily indicative of the results that can be expected for the entire fiscal year ending Dec. 31, 2011.

Use Of Estimates

The use of estimates is inherent in the preparation of financial statements in accordance with GAAP. Actual results could differ from these estimates. The year-end consolidated condensed balance sheet data was derived from audited financial statements, however this quarterly report on Form 10-Q does not include all year-end disclosures required for an annual report on Form 10-K by GAAP in the United States of America.

Revenues

Revenues

As of Sep. 30, 2011 and Dec. 31, 2010, unbilled revenues of $58.1 million and $65.5 million, respectively, are included in the "Receivables" line item on the Consolidated Condensed Balance Sheets.

Accounting For Franchise Fees And Gross Receipts

Accounting for Franchise Fees and Gross Receipts

Tampa Electric and PGS are allowed to recover from customers certain costs incurred through rates approved by the FPSC. The amounts included in customers' bills for franchise fees and gross receipt taxes are included as revenues on the Consolidated Condensed Statements of Income. These amounts totaled $28.8 million and $84.3 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $31.0 million and $90.0 million for the three and nine months ended Sep. 30, 2010. Franchise fees and gross receipt taxes payable by the regulated utilities are included as an expense on the Consolidated Condensed Statements of Income in "Taxes, other than income". These amounts totaled $28.8 million and $84.3 million, respectively, for the three and nine months ended Sep. 30, 2011, compared to $31.1 million and $89.9 million for the three and nine months ended Sep. 30, 2010.

Purchased Power

Purchased Power

Cash Flows Related to Derivatives and Hedging Activities

Tampa Electric Company classifies cash inflows and outflows related to derivative and hedging instruments in the appropriate cash flow sections associated with the item being hedged. For natural gas and ongoing interest rate swaps, the cash inflows and outflows are included in the operating section. For interest rate swaps that settle coincident with the debt issuance, the cash inflows and outflows are treated as premiums or discounts and included in the financing section of the Consolidated Condensed Statements of Cash Flows.

- Definition

Disclosure of accounting policy for subsidiaries or other investments that are consolidated, including the accounting treatment for intercompany accounts or transactions and any noncontrolling interest.

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- Definition

Disclosure of accounting policy for derivatives used in hedging relationships, which may include how gains or losses are recognized and presented in the financial statements, and amortization policies for deferred amounts.

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- Definition

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

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- Definition

Disclosure of accounting policy for revenue recognition for franchising fees, which is consideration or a share of proceeds paid to the entity by another party for the right to operate a business using the entity's name, merchandise, and supplies. Furthermore, discloses whether the installment or cost recovery method is being used to account for franchise fee revenue if no basis exists for estimating the collectability of specific franchise fees, the sales price of such franchises, the revenue and related costs deferred, the periods in which the fees will become payable by the franchisee, and fees originally deferred but later recognized because uncertainties regarding the collectability of the fees have been resolved.

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