Tampa Electric 10-Q 5 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 29, 2016
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Trading Symbol	TE
Entity Registrant Name	TECO ENERGY INC
Entity Central Index Key	350,563
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		235,550,000
Tampa Electric Company [Member]
Document Information [Line Items]
Entity Registrant Name	TAMPA ELECTRIC COMPANY
Entity Central Index Key	96,271
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		10

Consolidated Condensed Balance

Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 46.1	$ 23.8
Receivables, less allowance for uncollectibles	240.1	280.7
Inventories, at average cost
Regulatory assets	40.2	44.8
Prepayments and other current assets	25.4	30.8
Total current assets	547.2	570.3
Property, plant and equipment
Construction work in progress	816.9	794.7
Other property	16.1	15.9
Property, plant and equipment, at original costs	10,315.4	10,194.7
Accumulated depreciation	(2,762.4)	(2,712.9)
Total property, plant and equipment, net	7,553	7,481.8
Other assets
Regulatory assets	393.4	395.2
Goodwill	408.4	408.4
Deferred charges and other assets	79.1	77.8
Total other assets	880.9	881.4
Total assets	8,981.1	8,933.5
Current liabilities
Long-term debt due within one year	83.3	333.3
Notes payable	513	247
Accounts payable	189.5	255.4
Customer deposits	176.7	182.1
Regulatory liabilities	108.4	84.8
Derivative liabilities	22.3	24.1
Interest accrued	54	36.2
Taxes accrued	28.2	13.2
Other	25.2	22.6
Total current liabilities	1,200.6	1,198.7
Other liabilities
Deferred income taxes	607	570.7
Investment tax credits	10.4	10.5
Regulatory liabilities	709.4	715.8
Derivative liabilities	0.8	2.1
Deferred credits and other liabilities	380.9	387.5
Long-term debt, less amount due within one year	3,489.7	3,489.2
Total other liabilities	$ 5,198.2	$ 5,175.8
Commitments and contingencies
Capital
Common equity	$ 235.5	$ 235.3
Additional paid in capital	1,894.8	1,894.5
Retained earnings	463.5	441.4
Accumulated other comprehensive loss	(11.5)	(12.2)
Total capital	2,582.3	2,559
Long-term debt	3,489.7	3,489.2
Total liabilities and capital	8,981.1	8,933.5
Tampa Electric Company [Member]
Current assets
Cash and cash equivalents	28.2	9.1
Receivables, less allowance for uncollectibles	205.5	230.2
Inventories, at average cost
Taxes receivable from affiliate	0	61.3
Regulatory assets	39.9	44.3
Prepayments and other current assets	17	21.5
Total current assets	479.6	545.1
Property, plant and equipment
Construction work in progress	797	771.1
Utility plant in service, at original costs	9,544.6	9,440
Accumulated depreciation	(2,720.3)	(2,676.8)
Utility plant in service, net	6,824.3	6,763.2
Other property	9.9	9.7
Total property, plant and equipment, net	6,834.2	6,772.9
Other assets
Regulatory assets	373.1	373.8
Deferred charges and other assets	391	390.6
Other	17.9	16.8
Total assets	7,704.8	7,708.6
Current liabilities
Long-term debt due within one year	83.3	83.3
Notes payable	0	61
Accounts payable	174.6	221.6
Customer deposits	170.9	176.3
Regulatory liabilities	104.5	83.2
Derivative liabilities	22.2	24.1
Interest accrued	41.2	16.9
Taxes accrued	33.6	13.2
Other	10.1	10.2
Total current liabilities	640.4	689.8
Other liabilities
Deferred income taxes	1,342	1,308.8
Investment tax credits	10.4	10.5
Regulatory liabilities	595.5	603.5
Derivative liabilities	0.8	2.1
Deferred credits and other liabilities	312.3	316.7
Long-term debt, less amount due within one year	2,162	2,161.7
Total deferred credits	$ 2,261	$ 2,241.6
Commitments and contingencies
Capital
Common equity	$ 2,330.4	$ 2,305.4
Retained earnings	314.4	313.7
Accumulated other comprehensive loss	(3.4)	(3.6)
Total capital	2,641.4	2,615.5
Long-term debt	2,162	2,161.7
Total capitalization	4,803.4	4,777.2
Total liabilities and capital	7,704.8	7,708.6
Fuel [Member]
Inventories, at average cost
Utility inventories	118.3	113.4
Fuel [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	115.4	105.6
Materials and Supplies [Member]
Inventories, at average cost
Utility inventories	77.1	76.8
Materials and Supplies [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	73.6	73.1
Electric [Member]
Property, plant and equipment
Utility plant in service, at original costs	7,328.3	7,270.3
Electric [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Utility plant in service, at original costs	7,328.3	7,270.3
Gas [Member]
Property, plant and equipment
Utility plant in service, at original costs	2,154.1	2,113.8
Gas [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Utility plant in service, at original costs	$ 1,419.3	$ 1,398.6

Consolidated Condensed Balance3

Consolidated Condensed Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Allowance for uncollectibles	$ 2.1	$ 2.1
Common equity, shares authorized	400,000,000	400,000,000
Common equity, par value	$ 1	$ 1
Common equity, shares outstanding	235,500,000	235,300,000
Tampa Electric Company [Member]
Allowance for uncollectibles	$ 1.6	$ 1.5

Consolidated Condensed Statemen

Consolidated Condensed Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Regulated electric	$ 423.4	$ 449.7
Regulated gas	232.9	240.2
Unregulated	3.2	3.1
Total revenues	659.5	693
Expenses
Fuel	115.2	144.1
Purchased power	14.4	17.1
Cost of natural gas sold	96.8	103
Other	142.3	143.7
Operation and maintenance other expense	0	1.6
Depreciation and amortization	89.8	85.5
Taxes, other than income	52.9	51.8
Total expenses	511.4	546.8
Income from operations	148.1	146.2
Other income
Allowance for other funds used during construction	5.7	3.8
Other income, net	1.5	1.6
Total other income	7.2	5.4
Interest charges
Interest expense	48.9	49.8
Allowance for borrowed funds used during construction	(3)	(1.9)
Total interest charges	45.9	47.9
Income from continuing operations before provision for income taxes	109.4	103.7
Provision for income taxes	35.7	39.9
Net income from continuing operations	73.7	63.8
Discontinued operations
Income (loss) from discontinued operations	0.2	(9.6)
Provision (benefit) from income taxes	0.1	(3.8)
Income (loss) from discontinued operations, net	0.1	(5.8)
Net income	$ 73.8	$ 58
Average common shares outstanding - Basic	234	232.8
Average common shares outstanding - Diluted	235.2	233.5
Earnings per share from continuing operations - Basic	$ 0.31	$ 0.27
Earnings per share from continuing operations - Diluted	0.31	0.27
Earnings per share from discontinued operations - Basic	0	(0.02)
Earnings per share from discontinued operations - Diluted	0	(0.02)
Earnings per share - Basic	0.31	0.25
Earnings per share - Diluted	0.31	0.25
Dividends paid per common share outstanding	$ 0.230	$ 0.225

Consolidated Condensed Stateme5

Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 73.8	$ 58
Other comprehensive income, net of tax
Gain on cash flow hedges		0.2	0.3
Amortization of unrecognized benefit costs	[1]	0.5	0.6
Other comprehensive income, net of tax		0.7	0.9
Comprehensive income		$ 74.5	$ 58.9
[1]	Related to postretirement and postemployment benefits. See Note 5 for additional information.

Consolidated Condensed Stateme6

Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net income	$ 73.8	$ 58
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	89.8	85.9
Depreciation and amortization	89.8	85.5
Deferred income taxes and investment tax credits	36.1	36
Allowance for other funds used during construction	(5.7)	(3.8)
Non-cash stock compensation	3	3.9
Deferred recovery clauses	26.4	(5.7)
Receivables, less allowance for uncollectibles	40.6	51
Inventories	(5.2)	(15.7)
Prepayments and other current assets	2.8	(10.9)
Taxes accrued	18.1	1.7
Interest accrued	17.8	17.8
Accounts payable	(59.1)	(63.5)
Other	(6.8)	(7.7)
Cash flows from operating activities	231.6	147
Cash flows from investing activities
Capital expenditures	(168)	(156.2)
Other investing activities	(0.2)	(0.2)
Cash flows used in investing activities	(168.2)	(156.4)
Cash flows from financing activities
Dividends and dividend equivalents	(54.3)	(53)
Proceeds from the sale of common stock	3.9	2.8
Repayment of long-term debt/purchase in lieu of redemption	(250)	0
Net increase (decrease) in short-term debt (maturities of 90 days or less)	(134)	67
Proceeds from other short-term debt (maturities over 90 days)	400	0
Other financing activities	(6.7)	0
Cash flows from (used in) financing activities	(41.1)	16.8
Net increase in cash and cash equivalents	22.3	7.4
Cash and cash equivalents at beginning of the period	23.8	25.4
Cash and cash equivalents at end of the period	46.1	32.8
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	(6)	11.5
Tampa Electric Company [Member]
Cash flows from operating activities
Net income	63.3	62.8
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	80.9	76.8
Deferred income taxes and investment tax credits	30.4	21.2
Allowance for other funds used during construction	(5.6)	(3.8)
Deferred recovery clauses	27	(4.7)
Receivables, less allowance for uncollectibles	24.7	13.5
Inventories	(10.3)	(21.1)
Prepayments and other current assets	4.6	(5)
Taxes accrued	81.7	72.7
Interest accrued	24.3	22.9
Accounts payable	(41.2)	(28.3)
Other	(11.6)	(6.9)
Cash flows from operating activities	268.2	200.1
Cash flows from investing activities
Capital expenditures	(150.5)	(148.8)
Cash flows used in investing activities	(150.5)	(148.8)
Cash flows from financing activities
Dividends and dividend equivalents	(62.6)	(55.7)
Proceeds from the sale of common stock	25	20
Net increase (decrease) in short-term debt (maturities of 90 days or less)	(61)	(11)
Cash flows from (used in) financing activities	(98.6)	(46.7)
Net increase in cash and cash equivalents	19.1	4.6
Cash and cash equivalents at beginning of the period	9.1	10.4
Cash and cash equivalents at end of the period	28.2	15
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	$ (4.8)	$ 11.4

Consolidated Condensed Stateme7

Consolidated Condensed Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Total revenues	$ 659.5	$ 693
Expenses
Fuel	115.2	144.1
Purchased power	14.4	17.1
Cost of natural gas sold	96.8	103
Other	142.3	143.7
Depreciation and amortization	89.8	85.5
Taxes, other than income	52.9	51.8
Total expenses	511.4	546.8
Income from operations	148.1	146.2
Other income
Allowance for other funds used during construction	5.7	3.8
Other income, net	1.5	1.6
Total other income	7.2	5.4
Interest charges
Interest expense	48.9	49.8
Allowance for borrowed funds used during construction	(3)	(1.9)
Total interest charges	45.9	47.9
Income before provision for income taxes	109.4	103.7
Provision for income taxes	35.7	39.9
Net income	73.8	58
Other comprehensive income, net of tax
Gain on cash flow hedges	0.2	0.3
Other comprehensive income, net of tax	0.7	0.9
Comprehensive income	74.5	58.9
Tampa Electric Company [Member]
Revenues
Electric	424.2	450.4
Gas	126.8	121.7
Total revenues	551	572.1
Expenses
Fuel	115.1	144.1
Purchased power	14.4	17.1
Cost of natural gas sold	50.3	43.3
Other	121.2	121.8
Depreciation and amortization	80.9	76.8
Taxes, other than income	48.5	47.6
Total expenses	430.4	450.7
Income from operations	120.6	121.4
Other income
Allowance for other funds used during construction	5.6	3.8
Other income, net	1.3	1.2
Total other income	6.9	5
Interest charges
Interest on long-term debt	29	27.7
Interest expense	1.2	1.1
Allowance for borrowed funds used during construction	(2.7)	(1.8)
Total interest charges	27.5	27
Income before provision for income taxes	100	99.4
Provision for income taxes	36.7	36.6
Net income	63.3	62.8
Other comprehensive income, net of tax
Gain on cash flow hedges	0.2	0.3
Other comprehensive income, net of tax	0.2	0.3
Comprehensive income	$ 63.5	$ 63.1

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2016
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies See TECO Energy, Inc.’s 2015 Annual Report on Form 10-K for a complete discussion of the company’s accounting policies. The significant accounting policies for all utility and diversified operations include: Principles of Consolidation and Basis of Presentation 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 TECO Energy, Inc. and its subsidiaries as of Mar. 31, 2016 and Dec. 31, 2015, and the results of operations and cash flows for the periods ended Mar. 31, 2016 and 2015. The results of operations for the three months ended Mar. 31, 2016 are not necessarily indicative of the results that can be expected for the entire fiscal year ending Dec. 31, 2016. The use of estimates is inherent in the preparation of financial statements in accordance with U.S. 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 U.S. GAAP. On Sept. 4, 2015, TECO Energy and Emera entered into the Merger Agreement. Upon closing, TECO Energy will become a wholly owned indirect subsidiary of Emera. See Note 16 Revenues As of Mar. 31, 2016 and Dec. 31, 2015, unbilled revenues of $67.3 million and $81.1 million, respectively, are included in the “Receivables” line item on the Consolidated Condensed Balance Sheets. Accounting for Franchise Fees and Gross Receipt Taxes Tampa Electric and PGS are allowed to recover certain costs from customers on a dollar-per-dollar basis through prices 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. Franchise fees and gross receipt taxes payable by Tampa Electric and PGS are included as an expense on the Consolidated Condensed Statements of Income in “Taxes, other than income”. These amounts totaled $27.9 million and $27.4 million for the three months ended Mar. 31, 2016 and 2015, respectively. NMGC is an agent in the collection and payment of franchise fees and gross receipt taxes and is not required by a tariff to present the amounts on a gross basis. Therefore, NMGC’s franchise fees and gross receipt taxes are presented net with no line-item impact on the Consolidated Condensed Statements of Income.
Tampa Electric Company [Member]
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies See TEC’s 2015 Annual Report on Form 10-K for a complete discussion of accounting policies. The significant accounting policies for TEC include: Principles of Consolidation and Basis of Presentation TEC is a wholly owned subsidiary of TECO Energy. For the purposes of its consolidated financial reporting, TEC 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. For the periods presented, no VIEs have been consolidated (see Note 13 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 TEC as of Mar. 31, 2016 and Dec. 31, 2015, and the results of operations and cash flows for the periods ended Mar. 31, 2016 and 2015. The results of operations for the three months ended Mar. 31, 2016 are not necessarily indicative of the results that can be expected for the entire fiscal year ending Dec. 31, 2016. The use of estimates is inherent in the preparation of financial statements in accordance with U.S. 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 U.S. GAAP. On Sept. 4, 2015, TECO Energy and Emera entered into the Merger Agreement. Upon closing, TECO Energy will become a wholly owned indirect subsidiary of Emera. See Note 14 Revenues As of Mar. 31, 2016 and Dec. 31, 2015, unbilled revenues of $56.8 million and $53.7 million, respectively, are included in the “Receivables” line item on the Consolidated Condensed Balance Sheets. Accounting for Franchise Fees and Gross Receipts Tampa Electric and PGS are allowed to recover certain costs from customers on a dollar-per-dollar basis through prices 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. Franchise fees and gross receipt taxes payable by Tampa Electric and PGS are included as an expense on the Consolidated Condensed Statements of Income in “Taxes, other than income”. These amounts totaled $27.9 million and $27.4 million for the three months ended Mar. 31, 2016 and 2015, respectively.

New Accounting Pronouncements

New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2016
New Accounting Pronouncements	2. New Accounting Pronouncements Change in Accounting Policy Presentation of Debt Issuance Costs In April 2015, the FASB issued guidance regarding the presentation of debt issuance costs on the balance sheet. Under the new guidance, an entity is required to present debt issuance costs as a direct deduction from the carrying amount of the related debt liability rather than as a deferred charge (i.e., as an asset) under current guidance. In August 2015, the FASB amended the guidance to include an SEC staff announcement that it will not object to a company presenting debt issuance costs related to line-of-credit arrangements as an asset, regardless of whether a balance is outstanding. This guidance became effective for the company beginning in 2016 and is required to be applied on a retrospective basis for all periods presented. As of Mar. 31, 2016 and Dec. 31, 2015, the company classified $26.4 million and $27.7 million, respectively, of debt issuance costs, which do not include costs for line-of-credit arrangements, as a deduction in the “Long-term debt, less amount due within one year” line item on the company’s Consolidated Condensed Balance Sheet (previously classified in the “Deferred charges and other assets” line item). The guidance did not affect the company’s results of operations or cash flows. Stock Compensation In March 2016, the FASB issued guidance regarding employee share-based payment accounting. The guidance simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, accounting for forfeitures, classification of awards as either equity or liability, and presentation on the statement of cash flows. This guidance will be required for the company beginning in 2017. As early adoption is permitted, the company adopted the standard as of Jan. 1, 2016. Each aspect has an accounting impact and was implemented as follows: · Income tax consequences – Under the new guidance, the company will no longer recognize excess tax benefits and certain tax deficiencies in additional paid in capital. Instead, the company will recognize all excess tax benefits and tax deficiencies as income tax expense or benefit on the income statement. In addition, the guidance eliminates the requirement that excess tax benefits be realized before the company can recognize them. Accordingly, the company recorded a $2.6 million cumulative adjustment to retained earnings as of Jan. 1, 2016 for excess tax benefits related to prior periods. In accordance with the new guidance, the company will no longer include excess tax benefits and tax deficiencies in the dilutive EPS calculation on a prospective basis. · Accounting for forfeitures – The company’s policy is to estimate the number of awards expected to be forfeited, which is consistent with prior periods. · Classification of awards - The company had no share-based payments classified as liability awards as of Mar. 31, 2016 or Dec. 31, 2015. · Presentation on the statement of cash flows – Excess tax benefits are required to be presented as an operating activity on the statement of cash flows rather than as a financing activity. The change may be applied retrospectively or prospectively. The company elected to apply it prospectively, and prior periods were not retrospectively adjusted. Additionally, employee taxes paid by an employer to a tax authority when shares are withheld for tax-withholding purposes are required to be presented as a financing activity on a retrospective basis for all periods presented. Previously, the company presented it as an operating activity. There was an immaterial amount of activity that did not result in an adjustment to the statement of cash flows for the three months ended Mar. 31, 2015. Future Accounting Pronouncements Revenue from Contracts with Customers In May 2014, the FASB issued guidance regarding the accounting for revenue from contracts with customers. The standard is principle-based and provides a five-step model to determine when and how revenue is recognized. The core principle is that a company should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In addition, the guidance will require additional disclosures regarding the nature, amount, timing and uncertainty of revenue arising from contracts with customers. This guidance will be effective for the company beginning in 2018, with early adoption permitted in 2017, and will allow for either full retrospective adoption or modified retrospective adoption. The company expects to adopt this guidance effective Jan. 1, 2018, and is continuing to evaluate the available adoption methods and the impact of the adoption of this guidance on its financial statements, but does not expect the impact to be significant. Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued guidance related to accounting for financial instruments, including equity investments, financial liabilities under the fair value option, valuation allowances for available-for-sale debt securities, and the presentation and disclosure requirements for financial instruments. The company does not have equity investments or available-for-sale debt securities and it does not record financial liabilities under the fair value option. However, it is evaluating the impact of the adoption of this guidance on its financial statement disclosures, including those regarding the fair value of its long-term debt, but it does not expect the impact to be significant. The guidance will be effective for the company beginning in 2018. Leases In February 2016, the FASB issued guidance regarding the accounting for leases. The objective is to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet for leases with a lease term of more than 12 months. Under the existing guidance, operating leases are not recorded as lease assets and lease liabilities on the balance sheet. Recognition of expenses for both operating and finance leases will be similar to existing guidance and as a result is expected to limit the impact of the changes on the income statement and statement of cash flows. In addition, the guidance will require additional disclosures regarding key information about leasing arrangements. This guidance will be effective for the company beginning in 2019, with early adoption permitted, and will be applied using a modified retrospective approach. The company is currently evaluating the impacts of the adoption of the guidance on its financial statements. Derivative Contract Novations In March 2016, the FASB issued guidance clarifying that a change in the counterparty to a derivative contract, in and of itself, does not require the dedesignation of a hedging relationship provided that all other hedge accounting criteria continue to be met. The guidance is effective for the company beginning in 2017, with early adoption permitted, and may be applied on a prospective or modified retrospective basis. The guidance will not affect the company’s current financial statements. However, the company will assess the impact of this guidance on future derivative contract novations, if any.
Tampa Electric Company [Member]
New Accounting Pronouncements	2. New Accounting Pronouncements Change in Accounting Policy Presentation of Debt Issuance Costs In April 2015, the FASB issued guidance regarding the presentation of debt issuance costs on the balance sheet. Under the new guidance, an entity is required to present debt issuance costs as a direct deduction from the carrying amount of the related debt liability rather than as a deferred charge (i.e., as an asset) under current guidance. In August 2015, the FASB amended the guidance to include an SEC staff announcement that it will not object to a company presenting debt issuance costs related to line-of-credit arrangements as an asset, regardless of whether a balance is outstanding. This guidance became effective for TEC beginning in 2016 and is required to be applied on a retrospective basis for all periods presented. As of Mar. 31, 2016 and Dec. 31, 2015, TEC classified $17.9 million and $18.1 million, respectively, of debt issuance costs, which do not include costs for line-of-credit arrangements, as a deduction in the “Long-term debt, less amount due within one year” line item on the company’s Consolidated Condensed Balance Sheet (previously classified as an asset in the “Unamortized debt expense” line item). The guidance did not affect TEC’s results of operations or cash flows. Future Accounting Pronouncements Revenue from Contracts with Customers In May 2014, the FASB issued guidance regarding the accounting for revenue from contracts with customers. The standard is principle-based and provides a five-step model to determine when and how revenue is recognized. The core principle is that a company should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In addition, the guidance will require additional disclosures regarding the nature, amount, timing and uncertainty of revenue arising from contracts with customers. This guidance will be effective for TEC beginning in 2018, with early adoption permitted in 2017, and will allow for either full retrospective adoption or modified retrospective adoption. TEC expects to adopt this guidance effective Jan. 1, 2018, and is continuing to evaluate the available adoption methods and the impact of the adoption of this guidance on its financial statements, but does not expect the impact to be significant. Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued guidance related to accounting for financial instruments, including equity investments, financial liabilities under the fair value option, valuation allowances for available-for-sale debt securities, and the presentation and disclosure requirements for financial instruments. TEC does not have equity investments or available-for-sale debt securities and it does not record financial liabilities under the fair value option. However, it is evaluating the impact of the adoption of this guidance on its financial statement disclosures, including those regarding the fair value of its long-term debt, but it does not expect the impact to be significant. The guidance will be effective for TEC beginning in 2018. Leases In February 2016, the FASB issued guidance regarding the accounting for leases. The objective is to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet for leases with a lease term of more than 12 months. Under the existing guidance, operating leases are not recorded as lease assets and lease liabilities on the balance sheet. Recognition of expenses for both operating and finance leases will be similar to existing guidance and as a result is expected to limit the impact of the changes on the income statement and statement of cash flows. In addition, the guidance will require additional disclosures regarding key information about leasing arrangements. This guidance will be effective for TEC beginning in 2019, with early adoption permitted, and will be applied using a modified retrospective approach. TEC is currently evaluating the impacts of the adoption of the guidance on its financial statements. Derivative Contract Novations In March 2016, the FASB issued guidance clarifying that a change in the counterparty to a derivative contract, in and of itself, does not require the dedesignation of a hedging relationship provided that all other hedge accounting criteria continue to be met. The guidance is effective for TEC beginning in 2017, with early adoption permitted, and may be applied on a prospective or modified retrospective basis. The guidance will not affect TEC’s current financial statements. However, TEC will assess the impact of this guidance on future derivative contract novations, if any.

Regulatory

Regulatory	3 Months Ended
	Mar. 31, 2016
Regulatory	3. Regulatory Tampa Electric’s retail business and PGS are regulated by the FPSC. Tampa Electric is also subject to regulation by the FERC. The operations of PGS are regulated by the FPSC separately from the operations of Tampa Electric. The FPSC has jurisdiction over rates, service, issuance of securities, safety, accounting and depreciation practices and other matters. In general, the FPSC sets rates at a level that allows utilities such as Tampa Electric and PGS to collect total revenues (revenue requirement) equal to their cost of providing service, plus a reasonable return on invested capital. NMGC is subject to regulation by the NMPRC. The NMPRC has jurisdiction over the regulatory matters related, directly and indirectly, to NMGC providing service to its customers, including, among other things, rates, accounting procedures, securities issuances, and standards of service. NMGC must follow certain accounting guidance that pertains specifically to entities that are subject to such regulation. Comparable to the FPSC, the NMPRC sets rates at a level that allows utilities such as NMGC to collect total revenues (revenue requirement) equal to their cost of providing service, plus a reasonable return on invested capital. Regulatory Assets and Liabilities Tampa Electric, PGS and NMGC apply the accounting standards for regulated operations. Areas of applicability include: deferral of revenues under approved regulatory agreements; revenue recognition resulting from cost-recovery clauses that provide for monthly billing charges to reflect increases or decreases in fuel, purchased power, conservation and environmental costs; the deferral of costs as regulatory assets to the period in which the regulatory agency recognizes them when cost recovery is ordered over a period longer than a fiscal year; and the advance recovery of expenditures for approved costs such as future storm damage or the future removal of property. All regulatory assets are recovered through the regulatory process. Details of the regulatory assets and liabilities as of Mar. 31, 2016 and Dec. 31, 2015 are presented in the following table: Regulatory Assets and Liabilities (millions) Mar. 31, 2016 Dec. 31, 2015 Regulatory assets: Regulatory tax asset (1) $ 77.1 $ 74.7 Cost-recovery clauses - deferred balances (2) 0.1 5.5 Cost-recovery clauses - offsets to derivative liabilities (2) 26.0 26.5 Environmental remediation (3) 54.4 54.0 Postretirement benefits (4) 238.5 240.6 Deferred bond refinancing costs (5) 6.2 6.5 Debt basis adjustment (6) 16.7 17.5 Competitive rate adjustment (2) 2.5 2.6 Other 12.1 12.1 Total regulatory assets 433.6 440.0 Less: Current portion 40.2 44.8 Long-term regulatory assets $ 393.4 $ 395.2 Regulatory liabilities: Regulatory tax liability $ 7.6 $ 7.9 Cost-recovery clauses (2) 80.0 55.9 Transmission and delivery storm reserve 56.1 56.1 Accumulated reserve - cost of removal (7) 673.6 679.9 Other 0.5 0.8 Total regulatory liabilities 817.8 800.6 Less: Current portion 108.4 84.8 Long-term regulatory liabilities $ 709.4 $ 715.8 (1) The regulatory tax asset is primarily associated with the depreciation and recovery of AFUDC-equity. This asset does not earn a return but rather is included in capital structure, which is used in the calculation of the weighted cost of capital used to determine revenue requirements. It will be recovered over the expected life of the related assets. (2) These assets and liabilities are related to FPSC and NMPRC clauses and riders. They are recovered or refunded through cost-recovery mechanisms approved by the FPSC or NMPRC, as applicable, on a dollar-for-dollar basis in the next year. In the case of the regulatory asset related to derivative liabilities, recovery occurs in the year following the settlement of the derivative position. (3) This asset is related to costs associated with environmental remediation primarily at manufactured gas plant sites. The balance is included in rate base, partially offsetting the related liability, and earns a rate of return as permitted by the FPSC. The timing of recovery is impacted by the timing of the expenditures related to remediation. (4) This asset is related to the deferred costs of postretirement benefits. It is included in rate base and earns a rate of return as permitted by the FPSC or NMPRC, as applicable. It is amortized over the remaining service life of plan participants. (5) This asset represents the past costs associated with refinancing debt. It does not earn a return but rather is included in capital structure, which is used in the calculation of the weighted cost of capital used to determine revenue requirements. It will be amortized over the term of the related debt instruments. (6) This asset represents the difference between the fair value and pre-merger carrying amounts for NMGC’s long-term debt on the acquisition date. It does not earn a return and is not included in the regulatory capital structure. It is amortized over the term of the related debt instrument. (7) This item represents the non-ARO cost of removal in the accumulated reserve for depreciation.
Tampa Electric Company [Member]
Regulatory	3. Regulatory Tampa Electric’s and PGS’s retail businesses are regulated by the FPSC. Tampa Electric is also subject to regulation by the FERC. The operations of PGS are regulated by the FPSC separately from the operations of Tampa Electric. The FPSC has jurisdiction over rates, service, issuance of securities, safety, accounting and depreciation practices and other matters. In general, the FPSC sets rates at a level that allows utilities such as Tampa Electric and PGS to collect total revenues (revenue requirement) equal to their cost of providing service, plus a reasonable return on invested capital. Regulatory Assets and Liabilities Tampa Electric and PGS apply the accounting standards for regulated operations. Areas of applicability include: deferral of revenues under approved regulatory agreements; revenue recognition resulting from cost-recovery clauses that provide for monthly billing charges to reflect increases or decreases in fuel, purchased power, conservation and environmental costs; the deferral of costs as regulatory assets to the period in which the regulatory agency recognizes them when cost recovery is ordered over a period longer than a fiscal year; and the advance recovery of expenditures for approved costs such as future storm damage or the future removal of property. All regulatory assets are recovered through the regulatory process. Details of the regulatory assets and liabilities as of Mar. 31, 2016 and Dec. 31, 2015 are presented in the following table: Regulatory Assets and Liabilities (millions) Mar. 31, 2016 Dec. 31, 2015 Regulatory assets: Regulatory tax asset (1) $ 77.0 $ 74.6 Cost-recovery clauses - deferred balances (2) 0.0 5.2 Cost-recovery clauses - offsets to derivative liabilities (2) 25.9 26.2 Environmental remediation (3) 54.4 54.0 Postretirement benefits (4) 236.4 238.3 Deferred bond refinancing costs (5) 6.2 6.5 Competitive rate adjustment (2) 2.5 2.6 Other 10.6 10.7 Total regulatory assets 413.0 418.1 Less: Current portion 39.9 44.3 Long-term regulatory assets $ 373.1 $ 373.8 Regulatory liabilities: Regulatory tax liability $ 5.6 $ 5.7 Cost-recovery clauses (2) 76.1 54.2 Transmission and delivery storm reserve 56.1 56.1 Accumulated reserve - cost of removal (6) 561.7 570.0 Other 0.5 0.7 Total regulatory liabilities 700.0 686.7 Less: Current portion 104.5 83.2 Long-term regulatory liabilities $ 595.5 $ 603.5 (1) The regulatory tax asset is primarily associated with the depreciation and recovery of AFUDC-equity. This asset does not earn a return but rather is included in capital structure, which is used in the calculation of the weighted cost of capital used to determine revenue requirements. It will be recovered over the expected life of the related assets. (2) These assets and liabilities are related to FPSC clauses and riders. They are recovered or refunded through cost-recovery mechanisms approved by the FPSC on a dollar-for-dollar basis in the next year. In the case of the regulatory asset related to derivative liabilities, recovery occurs in the year following the settlement of the derivative position. (3) This asset is related to costs associated with environmental remediation primarily at manufactured gas plant sites. The balance is included in rate base, partially offsetting the related liability, and earns a rate of return as permitted by the FPSC. The timing of recovery is impacted by the timing of the expenditures related to remediation. (4) This asset is related to the deferred costs of postretirement benefits. It is included in rate base and earns a rate of return as permitted by the FPSC. It is amortized over the remaining service life of plan participants. (5) This asset represents the past costs associated with refinancing debt. It does not earn a return but rather is included in capital structure, which is used in the calculation of the weighted cost of capital used to determine revenue requirements. It will be amortized over the term of the related debt instruments. (6) This item represents the non-ARO cost of removal in the accumulated reserve for depreciation.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Taxes	4. Income Taxes The effective tax rate decreased to 32.63% for the three months ended Mar. 31, 2016 from 38.48% for the same period in 2015 primarily due to the tax benefit related to long-term incentive compensation share vestings (see Note 2 The company’s subsidiaries join in the filing of a U.S. federal consolidated income tax return. The IRS concluded its examination of the company’s 2014 consolidated federal income tax return in December 2015. The U.S. federal statute of limitations remains open for the year 2012 and forward. Years 2015 and 2016 are currently under examination by the IRS under its Compliance Assurance Program. U.S. state jurisdictions have statutes of limitations generally ranging from three to four years from the filing of an income tax return. Additionally, any state net operating losses that were generated in prior years and are still being utilized are subject to examination by state jurisdictions. The state impact of any federal changes remains subject to examination by various states for a period of up to one year after formal notification to the states. Years still open to examination by taxing authorities in major state jurisdictions and foreign jurisdictions include 2005 and forward. TECO Energy does not expect the settlement of audit examinations to significantly change the total amount of unrecognized tax benefits by the end of 2016.
Tampa Electric Company [Member]
Income Taxes	4. Income Taxes TEC is included in the filing of a consolidated federal income tax return with TECO Energy and its affiliates. TEC’s income tax expense is based upon a separate return computation. TEC’s effective tax rates for the three months ended Mar. 31, 2016 and 2015 differ from the statutory rate principally due to state income taxes, the domestic activity production deduction and the AFUDC-equity. The IRS concluded its examination of TECO Energy’s 2014 consolidated federal income tax return in December 2015. The U.S. federal statute of limitations remains open for the year 2012 and forward. Years 2015 and 2016 are currently under examination by the IRS under its Compliance Assurance Program. Florida’s statute of limitations is three years from the filing of an income tax return. The state impact of any federal changes remains subject to examination by various states for a period of up to one year after formal notification to the states. Years still open to examination by Florida’s tax authorities include 2005 and forward as a result of TECO Energy’s consolidated Florida net operating loss still being utilized. TEC does not expect the settlement of audit examinations to significantly change the total amount of unrecognized tax benefits by the end of 2016.

Employee Postretirement Benefit

Employee Postretirement Benefits	3 Months Ended
	Mar. 31, 2016
Employee Postretirement Benefits	5. Employee Postretirement Benefits Included in the table below is the periodic expense for pension and other postretirement benefits offered by the company. Amounts disclosed for pension benefits include the amounts related to the qualified pension plan and the non-qualified, non-contributory SERP. Pension Expense (millions) Pension Benefits Other Postretirement Benefits Three months ended Mar. 31, 2016 2015 2016 2015 Components of net periodic benefit expense Service cost $ 4.4 $ 4.5 $ 0.5 $ 0.6 Interest cost 8.1 7.4 2.2 2.0 Expected return on assets (11.3 ) (10.8 ) (0.3 ) (0.3 ) Amortization of: Prior service (benefit) cost 0.0 (0.1 ) (0.6 ) (0.6 ) Actuarial loss 3.4 3.4 0.0 0.0 Regulatory asset 0.0 0.0 0.2 0.3 Net pension expense recognized in the TECO Energy Consolidated Condensed Statements of Income $ 4.6 $ 4.4 $ 2.0 $ 2.0 For the fiscal 2016 plan year, TECO Energy is using an assumed long-term EROA of 7.00% and a discount rate of 4.685% for pension benefits under its qualified pension plan. For the Jan. 1, 2016 measurement of TECO Energy’s other postretirement benefits, TECO Energy assumed a discount rate of 4.667% for the Florida-based plan and 4.687% for the NMGC plan. Additionally, TECO Energy made contributions of $4.7 million and $14.9 million to its pension plan for the three months ended Mar. 31, 2016 and 2015, respectively. For the three months ended Mar. 31, 2016 and 2015, TECO Energy and its subsidiaries reclassified $0.8 million of pretax unamortized prior service benefit and actuarial losses from AOCI to net income as part of periodic benefit expense. In addition, during the three months ended Mar. 31, 2016 and 2015, the regulated companies reclassified $2.2 million of unamortized prior service benefit and actuarial losses from regulatory assets to net income as part of periodic benefit expense.
Tampa Electric Company [Member]
Employee Postretirement Benefits	5. Employee Postretirement Benefits TEC is a participant in the comprehensive retirement plans of TECO Energy. Amounts allocable to all participants of the TECO Energy retirement plans are found in Note 5 Employee Postretirement Benefits TECO Energy Notes to Consolidated Condensed Financial Statements For the fiscal 2016 plan year, TECO Energy assumed a long-term EROA of 7.00% and a discount rate of 4.685%. For the Jan. 1, 2016 measurement of TECO Energy’s other postretirement benefits, TECO Energy used a discount rate of 4.667%. Additionally, TECO Energy made contributions of $4.7 million and $14.9 million to its pension plan in the three months ended Mar. 31, 2016 and 2015, respectively. TEC’s portion of the contributions was $3.9 million and $11.0 million, respectively. Included in the benefit expenses discussed above, for the three months ended Mar. 31, 2016 and 2015, TEC reclassified $2.0 million and $1.9 million, respectively, of unamortized prior service benefit and actuarial losses from regulatory assets to net income.

Short-Term Debt

Short-Term Debt	3 Months Ended
	Mar. 31, 2016
Short-Term Debt	6. Short-Term Debt At Mar. 31, 2016 and Dec. 31, 2015, the following credit facilities and related borrowings existed: Credit Facilities Mar. 31, 2016 Dec. 31, 2015 Letters Letters Credit Borrowings of Credit Credit Borrowings of Credit (millions) Facilities Outstanding (1) Outstanding Facilities Outstanding (1) Outstanding Tampa Electric Company: 5-year facility (2) $ 325.0 $ 0.0 $ 0.5 $ 325.0 $ 0.0 $ 0.5 3-year accounts receivable facility (3) 150.0 0.0 0.0 150.0 61.0 0.0 TECO Energy/TECO Finance: 5-year facility (2)(4) 300.0 113.0 0.0 300.0 163.0 0.0 1-year term facility (4)(5) 400.0 400.0 0.0 0.0 0.0 0.0 New Mexico Gas Company: 5-year facility (2) 125.0 0.0 1.7 125.0 23.0 1.7 Total $ 1,300.0 $ 513.0 $ 2.2 $ 900.0 $ 247.0 $ 2.2 (1) Borrowings outstanding are reported as notes payable. (2) This 5-year facility matures Dec. 17, 2018. (3) Prior to Mar. 24, 2015, this was a 1-year facility. This 3-year facility matures Mar. 23, 2018. (4) TECO Finance is the borrower and TECO Energy is the guarantor of this facility. (5) This 1-year facility matures Mar. 14, 2017. At Mar. 31, 2016, these credit facilities required commitment fees ranging from 12.5 to 30.0 basis points. The weighted-average interest rate on outstanding amounts payable under the credit facilities at Mar. 31, 2016 and Dec. 31, 2015 was 1.44% and 1.29%, respectively. TECO Energy/TECO Finance Credit Facility On Mar. 14, 2016, TECO Finance entered into a one-year, $400 million credit agreement. The credit agreement (i) has a maturity date of Mar. 14, 2017; (ii) contains customary representations and warranties, events of default, and financial and other covenants; and (iii) provides for interest to accrue at variable rates based on
Tampa Electric Company [Member]
Short-Term Debt	6. Short-Term Debt At Mar. 31, 2016 and Dec. 31, 2015, the following credit facilities and related borrowings existed: Credit Facilities Mar. 31, 2016 Dec. 31, 2015 Letters Letters Credit Borrowings of Credit Credit Borrowings of Credit (millions) Facilities Outstanding (1) Outstanding Facilities Outstanding (1) Outstanding Tampa Electric Company: 5-year facility (2) $ 325.0 $ 0.0 $ 0.5 $ 325.0 $ 0.0 $ 0.5 3-year accounts receivable facility (3) 150.0 0.0 0.0 150.0 61.0 0.0 Total $ 475.0 $ 0.0 $ 0.5 $ 475.0 $ 61.0 $ 0.5 (1) Borrowings outstanding are reported as notes payable. (2) This 5-year facility matures Dec. 17, 2018. (3) Prior to Mar. 24, 2015, this was a 1-year facility. This 3-year facility matures Mar. 23, 2018. At Mar. 31, 2016, these credit facilities required commitment fees ranging from 12.5 to 30.0 basis points. The weighted-average interest rate on outstanding amounts payable under the credit facilities at Mar. 31, 2016 and Dec. 31, 2015 was 1.0% and 0.89%, respectively.

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2016
Long-Term Debt	7. Long-Term Debt Fair Value of Long-Term Debt At Mar. 31, 2016, total long-term debt had a carrying amount of $3,573.0 million and an estimated fair market value of $3,879.1 million. At Dec. 31, 2015, total long-term debt had a carrying amount of $3,822.5 million and an estimated fair market value of $4,061.6 million. The company uses the market approach in determining fair value. The majority of the outstanding debt is valued using real-time financial market data obtained from Bloomberg Professional Service. The remaining securities are valued using prices obtained from the Municipal Securities Rulemaking Board and by applying estimated credit spreads obtained from a third party to the par value of the security. All debt securities are Level 2 instruments (see Note 13 Purchase in Lieu of Redemption of Revenue Refunding Bonds On Mar. 19, 2008, the HCIDA remarketed $86.0 million HCIDA Pollution Control Revenue Refunding Bonds, Series 2006 (Non-AMT) (the Series 2006 HCIDA Bonds) in a term rate mode pursuant to the terms of the Loan and Trust Agreement governing those bonds. The Series 2006 HCIDA Bonds bore interest at a term rate of 5.00% per annum from Mar. 19, 2008 to Mar. 15, 2012. On Mar. 15, 2012, TEC purchased in lieu of redemption the Series 2006 HCIDA Bonds. The Series 2006 HCIDA Bonds bore interest at a term rate of 1.875% per annum from Mar. 15, 2012 to Mar. 15, 2016. On Mar. 15, 2016, pursuant to the terms of the Loan and Trust Agreement governing the Series 2006 HCIDA Bonds, a mandatory tender occurred and a term rate of 2.00% per annum will apply from Mar. 15, 2016 to Mar. 15, 2020. The 2016 mandatory tender did not impact the Consolidated Condensed Balance Sheet. TEC is responsible for payment of the interest and principal associated with the Series 2006 HCIDA Bonds. Regularly scheduled principal and interest when due, are insured by Ambac Assurance Corporation. As of Mar. 31, 2016, $232.6 million of bonds purchased in lieu of redemption, including the Series 2006 HCIDA Bonds described above, were held by the trustee at the direction of TEC to provide an opportunity to evaluate refinancing alternatives.
Tampa Electric Company [Member]
Long-Term Debt	7. Long-Term Debt Fair Value of Long-Term Debt At Mar. 31, 2016, TEC’s total long-term debt had a carrying amount of $2,245.3 million and an estimated fair market value of $2,483.1 million. At Dec. 31, 2015, TEC’s total long-term debt had a carrying amount of $2,245.0 million and an estimated fair market value of $2,433.3 million. TEC uses the market approach in determining fair value. The majority of the outstanding debt is valued using real-time financial market data obtained from Bloomberg Professional Service. The remaining securities are valued using prices obtained from the Municipal Securities Rulemaking Board and by applying estimated credit spreads obtained from a third party to the par value of the security. All debt securities are Level 2 instruments (see Note 11 Purchase in Lieu of Redemption of Revenue Refunding Bonds On Mar. 19, 2008, the HCIDA remarketed $86.0 million HCIDA Pollution Control Revenue Refunding Bonds, Series 2006 (Non-AMT) (the Series 2006 HCIDA Bonds) in a term-rate mode pursuant to the terms of the Loan and Trust agreement governing those bonds. The Series 2006 HCIDA Bonds bore interest at a term rate of 5.00% per annum from Mar. 19, 2008 to Mar. 15, 2012. On Mar. 15, 2012, TEC purchased in lieu of redemption the Series 2006 HCIDA Bonds. The Series 2006 HCIDA Bonds bore interest at a term rate of 1.875% per annum from Mar. 15, 2012 to Mar. 15, 2016. On Mar. 15, 2016, pursuant to the terms of the Loan and Trust Agreement governing the Series 2006 HCIDA Bonds, a mandatory tender occurred and a term rate of 2.00% per annum will apply from Mar. 15, 2016 to Mar. 15, 2020. The 2016 mandatory tender did not impact the Consolidated Condensed Balance Sheet. TEC is responsible for payment of the interest and principal associated with the Series 2006 HCIDA Bonds. Regularly scheduled principal and interest when due, are insured by Ambac Assurance Corporation. As of Mar. 31, 2016, $232.6 million of bonds purchased in lieu of redemption, including the series 2006 HCIDA Bonds described above, were held by the trustee at the direction of TEC to provide an opportunity to evaluate refinancing alternatives.

Other Comprehensive Income

Other Comprehensive Income	3 Months Ended
	Mar. 31, 2016
Other Comprehensive Income	8. Other Comprehensive Income TECO Energy reported the following OCI for the three months ended Mar. 31, 2016 and 2015 related to changes in the fair value of cash flow hedges and amortization of unrecognized benefit costs associated with the company’s postretirement plans: Other Comprehensive Income Three months ended Mar. 31, (millions) Gross Tax Net 2016 Unrealized gain on cash flow hedges $ 0.0 $ 0.0 $ 0.0 Reclassification from AOCI to net income (1) 0.3 (0.1 ) 0.2 Gain on cash flow hedges 0.3 (0.1 ) 0.2 Amortization of unrecognized benefit costs (2) 0.8 (0.3 ) 0.5 Total other comprehensive income $ 1.1 $ (0.4 ) $ 0.7 2015 Unrealized gain on cash flow hedges $ 0.3 $ (0.2 ) $ 0.1 Reclassification from AOCI to net income (1) 0.4 (0.2 ) 0.2 Gain on cash flow hedges 0.7 (0.4 ) 0.3 Amortization of unrecognized benefit costs (2) 0.9 (0.3 ) 0.6 Total other comprehensive income $ 1.6 $ (0.7 ) $ 0.9 (1) Related to interest rate contracts recognized in Interest expense. (2) Related to postretirement and postemployment benefits. See Note 5 Accumulated Other Comprehensive Loss (millions) Mar. 31, 2016 Dec. 31, 2015 Unamortized pension loss and prior service credit (1) $ (33.6 ) $ (34.2 ) Unamortized other benefit gains, prior service costs and transition obligations (2) 25.5 25.6 Net unrealized losses from cash flow hedges (3) (3.4 ) (3.6 ) Total accumulated other comprehensive loss $ (11.5 ) $ (12.2 ) (1) Net of tax benefit of $21.1 million and $21.5 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively. (2) Net of tax expense of $16.0 million and $16.1 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively. (3) Net of tax benefit of $2.1 million and $2.3 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively.
Tampa Electric Company [Member]
Other Comprehensive Income	12. Other Comprehensive Income Other Comprehensive Income Three months ended Mar. 31, (millions) Gross Tax Net 2016 Unrealized gain on cash flow hedges $ 0.0 $ 0.0 $ 0.0 Reclassification from AOCI to net income 0.3 (0.1 ) 0.2 Gain on cash flow hedges 0.3 (0.1 ) 0.2 Total other comprehensive income $ 0.3 $ (0.1 ) $ 0.2 2015 Unrealized gain on cash flow hedges $ 0.3 $ (0.2 ) $ 0.1 Reclassification from AOCI to net income 0.4 (0.2 ) 0.2 Gain on cash flow hedges 0.7 (0.4 ) 0.3 Total other comprehensive income $ 0.7 $ (0.4 ) $ 0.3 Accumulated Other Comprehensive Loss (millions) Mar. 31, 2016 Dec. 31, 2015 Net unrealized losses from cash flow hedges (1) $ (3.4 ) $ (3.6 ) Total accumulated other comprehensive loss $ (3.4 ) $ (3.6 ) (1) Net of tax benefit of $2.1 million and $2.3 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	9. Earnings Per Share For the three months ended Mar. 31, (millions, except per share amounts) 2016 2015 Basic earnings per share Net income from continuing operations $ 73.7 $ 63.8 Amount allocated to nonvested participating shareholders (0.1 ) (0.2 ) Income before discontinued operations available to common shareholders - Basic $ 73.6 $ 63.6 Income (loss) from discontinued operations, net $ 0.1 $ (5.8 ) Amount allocated to nonvested participating shareholders 0.0 0.0 Income (loss) from discontinued operations available to common shareholders - Basic $ 0.1 $ (5.8 ) Net income $ 73.8 $ 58.0 Amount allocated to nonvested participating shareholders (0.1 ) (0.2 ) Net income available to common shareholders - Basic $ 73.7 $ 57.8 Average common shares outstanding - Basic 234.0 232.8 Earnings per share from continuing operations available to common shareholders - Basic $ 0.31 $ 0.27 Earnings per share from discontinued operations available to common shareholders - Basic 0.0 $ (0.02 ) Earnings per share available to common shareholders - Basic $ 0.31 $ 0.25 Diluted earnings per share Net income from continuing operations $ 73.7 $ 63.8 Amount allocated to nonvested participating shareholders (0.1 ) (0.2 ) Income before discontinued operations available to common shareholders - Diluted $ 73.6 $ 63.6 Income (loss) from discontinued operations, net $ 0.1 $ (5.8 ) Amount allocated to nonvested participating shareholders 0.0 0.0 Income (loss) from discontinued operations available to common shareholders - Diluted $ 0.1 $ (5.8 ) Net income $ 73.8 $ 58.0 Amount allocated to nonvested participating shareholders (0.1 ) (0.2 ) Net income available to common shareholders - Diluted $ 73.7 $ 57.8 Unadjusted average common shares outstanding - Diluted 234.0 232.8 Assumed conversion of stock options, unvested restricted stock, unvested RSUs and contingent performance shares, net 1.2 0.7 Average common shares outstanding - Diluted 235.2 233.5 Earnings per share from continuing operations available to common shareholders - Diluted $ 0.31 $ 0.27 Earnings per share from discontinued operations available to common shareholders - Diluted 0.0 $ (0.02 ) Earnings per share available to common shareholders - Diluted $ 0.31 $ 0.25 Anti-dilutive shares 0.2 0.1

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies	10. Commitments and Contingencies Legal Contingencies From time to time, TECO Energy and its subsidiaries are involved in various legal, tax and regulatory proceedings before various courts, regulatory commissions and governmental agencies in the ordinary course of its business. Where appropriate, accruals are made in accordance with accounting standards for contingencies to provide for matters that are probable of resulting in an estimable loss. The company believes the claims in which the company or a subsidiary of the company is a defendant in the pending actions described below are without merit and intends to defend the matters vigorously. The company is unable at this time to estimate the possible loss or range of loss with respect to these matters. While the outcome of such proceedings is uncertain, management does not believe that their ultimate resolution will have a material adverse effect on the company’s results of operations, financial condition or cash flows. Peoples Gas Legal Proceedings In November 2010, heavy equipment operated at a road construction site being conducted by Posen Construction, Inc. struck a natural gas line causing a rupture and ignition of the gas and an outage in the natural gas service to Lee and Collier counties, Florida. PGS filed suit in April 2011 against Posen Construction, Inc. in Federal Court for the Middle District of Florida to recover damages for repair and restoration relating to the incident and Posen Construction, Inc. counter-claimed against PGS alleging negligence. In the first quarter of 2014, the parties entered into a settlement agreement that resolves the claims of the parties. In addition, the suit filed in November 2011 by the Posen Construction, Inc. employee operating the heavy equipment involved in the incident in Lee County Circuit Court against PGS and a PGS contractor involved in the project, seeking damages for his injuries, remains pending, with a trial currently expected in October 2016. New Mexico Gas Company Legal Proceedings In February 2011, NMGC experienced gas shortages due to weather-related interruptions of electric service, weather-related problems on the systems of various interstate pipelines and in gas fields that are the sources of gas supplied to NMGC, and high weather-driven usage. This gas supply disruption and high usage resulted in the declaration of system emergencies by NMGC causing involuntary curtailments of gas utility service to approximately 28,700 customers (residential and business). In March 2011, a customer purporting to represent a class consisting of all “32,000 [sic] customers” who had their gas utility service curtailed during the early-February system emergencies filed a putative class action lawsuit against NMGC. In March 2011, the Town of Bernalillo, New Mexico, purporting to represent a class consisting of all “New Mexico municipalities and governmental entities who have suffered damages as a result of the natural gas utility shut off” also filed a putative class action lawsuit against NMGC, four of its officers, and John and Jane Does at NMGC. In July 2011, the plaintiff in the Bernalillo class action filed an amended complaint to add an additional plaintiff purporting to represent a class of all “similarly situated New Mexico private businesses and enterprises.” In September 2015, a settlement was reached with all the named plaintiff class representatives in both of the class actions. The settlements were on an individual basis and not a class basis. The settlements are not material to the company’s financial position as of Mar. 31, 2016. In addition to the two settled class actions described above, 18 insurance carriers have filed two subrogation lawsuits for monies paid to their insureds as a result of the curtailment of natural gas service in February 2011. In January 2016, the judge entered summary judgment in favor of NMGC and all of the subrogation lawsuits were dismissed. The insurance carriers subsequently filed a timely appeal of the summary judgment, which is pending. Proceedings in connection with the Pending Merger with Emera Twelve securities class action lawsuits were filed against the company and its directors by holders of TECO Energy securities following the announcement of the Emera transaction. Eleven suits were filed in the Circuit Court for the 13th Judicial Circuit, in and for Hillsborough County, Florida. They alleged that TECO Energy’s board of directors breached its fiduciary duties in agreeing to the Merger Agreement and sought to enjoin the Merger. In addition, several of these suits alleged that one or more of TECO Energy, Emera and an Emera affiliate aided and abetted such alleged breaches. The securities class action lawsuits have been consolidated per court order. Since the consolidation, two of the complaints have been amended. One of those complaints has added a claim against the individual defendants for breach of fiduciary duty to disclose. The twelfth suit was filed in the Middle District of Florida Federal Court and has subsequently been voluntarily dismissed. The company also received two separate shareholder demand letters from purported shareholders of the company. Both of these letters demanded that the company maximize shareholder value and remove alleged conflicts of interest as well as eliminate allegedly preclusive deal protection devices. One of the letters also demanded that the company refrain from consummating the transaction with Emera. Both of these demand letters have subsequently been withdrawn. In November 2015, the parties to the lawsuits entered into a Memorandum of Understanding with the various shareholder plaintiffs to settle, subject to court approval, all of the pending shareholder lawsuits challenging the proposed Merger. As a result of the Memorandum of Understanding, the company made additional disclosures related to the proposed Merger in a proxy supplement. Per the terms of the Memorandum of Understanding, the parties will negotiate a settlement agreement and submit it to the court for approval after the Merger is complete. There can be no assurance that the parties will ultimately enter into a stipulation of settlement or that the court will approve the settlement even if the parties were to enter into a stipulation of settlement. Claim in connection with the Sale of TECO Coal As discussed in Note 15 TECO Guatemala Holdings, LLC v. The Republic of Guatemala On Dec. 19, 2013, the ICSID Tribunal hearing the arbitration claim of TGH, a wholly owned subsidiary of TECO Energy, against the Republic of Guatemala (Guatemala) under the DR – CAFTA, issued an award in the case (the Award). The ICSID Tribunal unanimously found in favor of TGH and awarded damages to TGH of approximately U.S. $21.1 million, plus interest from Oct. 21, 2010 at a rate equal to the U.S. prime rate plus 2%. In addition, the ICSID Tribunal ruled that Guatemala must reimburse TGH for approximately U.S. $7.5 million of the costs that it incurred in pursuing the arbitration. On Apr. 18, 2014, Guatemala filed an application for annulment of the entire Award (or, alternatively, certain parts of the Award) pursuant to applicable ICSID rules. Also on Apr. 18, 2014, TGH separately filed an application for partial annulment of the Award on the basis of certain deficiencies in the ICSID Tribunal’s determination of the amount of TGH’s damages. On Apr. 5, 2016, an ICSID ad hoc Committee issued a decision in favor of TGH in the annulment proceedings. In its decision, the ad hoc Committee unanimously dismissed Guatemala’s application for annulment of the award and upheld the original $21.1 million award, plus interest. In addition, the ad hoc Committee granted TGH’s application for partial annulment of the award, and ordered Guatemala to pay certain costs relating to the annulment proceedings. Because the Tribunal’s award of costs to TGH in its original arbitration was based on the Tribunal’s assessment that TGH had prevailed on liability and Guatemala had partially prevailed on damages, and the latter finding was annulled by the ad hoc Committee, the Committee also annulled the Tribunal’s award of costs to TGH. As a result, TGH has the right to resubmit its arbitration claim against Guatemala to seek additional damages (in addition to the previously awarded $21.1 million), as well as additional interest on the $21.1 million, and its full costs relating to the original arbitration and the new arbitration proceeding. Results to date do not reflect any benefit of this decision. PGS Compliance Matter In 2015, FPSC staff presented PGS with a summary of alleged safety rule violations, many of which were identified during PGS’ implementation of an action plan it instituted as a result of audit findings cited by FPSC audit staff in 2013. Following the 2013 audit and 2015 discussions with FPSC staff, PGS took immediate and significant corrective actions. The FPSC audit staff published a follow-up audit report that acknowledged the progress that had been made and found that further improvements were needed. As a result of this report, the Office of Public Counsel (OPC) filed a petition with the FPSC pointing to the violations of rules for safety inspections seeking fines or possible refunds to customers by PGS. On Feb. 25, 2016, the FPSC staff issued a notice informing PGS that the staff would be making a recommendation to the FPSC to initiate a show cause proceeding against PGS for alleged safety rule violations, with total potential penalties of up to $3.9 million. On Apr. 18, 2016, PGS reached a settlement regarding this matter with the OPC and FPSC staff and agreed to pay a $1 million civil penalty and customer refunds of $2 million. The FPSC approved the settlement agreement on May 5, 2016. Superfund and Former Manufactured Gas Plant Sites TEC, through its Tampa Electric and Peoples Gas divisions, is a PRP for certain superfund sites and, through its Peoples Gas division, for certain former manufactured gas plant sites. While the joint and several liability associated with these sites presents the potential for significant response costs, as of Mar. 31, 2016, TEC has estimated its ultimate financial liability to be $33.9 million, primarily at PGS. This amount has been accrued and is primarily reflected in the long-term liability section under “Deferred credits and other liabilities” on the Consolidated Condensed Balance Sheets. The environmental remediation costs associated with these sites, which are expected to be paid over many years, are not expected to have a significant impact on customer rates. The estimated amounts represent only the portion of the cleanup costs attributable to TEC. The estimates to perform the work are based on TEC’s experience with similar work, adjusted for site-specific conditions and agreements with the respective governmental agencies. The estimates are made in current dollars, are not discounted and do not assume any insurance recoveries. In instances where other PRPs are involved, most of those PRPs are creditworthy and are likely to continue to be creditworthy for the duration of the remediation work. However, in those instances that they are not, TEC could be liable for more than TEC’s actual percentage of the remediation costs. Factors that could impact these estimates include the ability of other PRPs to pay their pro-rata portion of the cleanup costs, additional testing and investigation which could expand the scope of the cleanup activities, additional liability that might arise from the cleanup activities themselves or changes in laws or regulations that could require additional remediation. Under current regulations, these costs are recoverable through customer rates established in subsequent base rate proceedings. Guarantees and Letters of Credit A summary of the face amount or maximum theoretical obligation and the year of expiration under letters of credit and guarantees as of Mar. 31, 2016 is as follows: (millions) Maximum After (1) Theoretical Liabilities Recognized Guarantees for the Benefit of: 2016 2017-2020 2020 Obligation at Mar. 31, 2016 TECO Energy Fuel sales and transportation (2) $ 0.0 $ 0.0 $ 92.9 $ 92.9 $ 0.0 Letters of indemnity - coal mining permits (3) 89.4 0.0 0.0 89.4 0.0 $ 89.4 $ 0.0 $ 92.9 $ 182.3 $ 0.0 Maximum (millions) After (1) Theoretical Liabilities Recognized Letters of Credit for the Benefit of: 2016 2017-2020 2020 Obligation at Mar. 31, 2016 (4) TEC $ 0.0 $ 0.0 $ 0.5 $ 0.5 $ 0.1 NMGC 0.0 0.0 1.7 1.7 0.0 $ 0.0 $ 0.0 $ 2.2 $ 2.2 $ 0.1 (1) These letters of credit and guarantees renew annually and are shown on the basis that they will continue to renew beyond 2020. (2) The amounts shown represent the maximum theoretical amounts of cash collateral that TECO Energy would be required to post in the event of a downgrade below investment grade for its long-term debt ratings by the major credit rating agencies. Liabilities recognized represent the associated potential obligation related to net derivative liabilities under these agreements at Mar. 31, 2016. See Note 12 (3) These letters of indemnity guarantee payments to certain surety companies that issued reclamation bonds to the Commonwealths of Kentucky and Virginia in connection with TECO Coal's mining operations. Payments to the surety companies would be triggered if the reclamation bonds are called upon by either of these states and the permit holder, TECO Coal, does not pay the surety. The amounts shown represent the maximum theoretical amounts that TECO Energy would be required to pay to the surety companies. As discussed in Note 15 (4) The amounts shown are the maximum theoretical amounts guaranteed under current agreements. Liabilities recognized represent the associated obligation of TECO Energy, TEC or NMGC under these agreements at Mar. 31, 2016. The obligations under these letters of credit include certain accrued injuries and damages when a letter of credit covers the failure to pay these claims. Financial Covenants In order to utilize their respective bank facilities, TECO Energy and its subsidiaries must meet certain financial tests, including a debt to capital ratio, as defined in the applicable agreements. In addition, TECO Energy and its subsidiaries have certain restrictive covenants in specific agreements and debt instruments. At Mar. 31, 2016, TECO Energy and its subsidiaries were in compliance with all applicable financial covenants.
Tampa Electric Company [Member]
Commitments and Contingencies	8. Commitments and Contingencies Legal Contingencies From time to time, TEC and its subsidiaries are involved in various legal, tax and regulatory proceedings before various courts, regulatory commissions and governmental agencies in the ordinary course of its business. Where appropriate, accruals are made in accordance with accounting standards for contingencies to provide for matters that are probable of resulting in an estimable loss. The company believes the claims in the pending actions described below are without merit and intends to defend the matters vigorously. The company is unable at this time to estimate the possible loss or range of loss with respect to these matters. While the outcome of such proceedings is uncertain, management does not believe that their ultimate resolution will have a material adverse effect on the company’s results of operations, financial condition or cash flows. Peoples Gas Legal Proceedings In November 2010, heavy equipment operated at a road construction site being conducted by Posen Construction, Inc. struck a natural gas line causing a rupture and ignition of the gas and an outage in the natural gas service to Lee and Collier counties, Florida. PGS filed suit in April 2011 against Posen Construction, Inc. in Federal Court for the Middle District of Florida to recover damages for repair and restoration relating to the incident and Posen Construction, Inc. counter-claimed against PGS alleging negligence. In the first quarter of 2014, the parties entered into a settlement agreement that resolves the claims of the parties. In addition, the suit filed in November 2011 by the Posen Construction, Inc. employee operating the heavy equipment involved in the incident in Lee County Circuit Court against PGS and a PGS contractor involved in the project, seeking damages for his injuries, remains pending, with a trial currently expected in October 2016. PGS Compliance Matter In 2015, FPSC staff presented PGS with a summary of alleged safety rule violations, many of which were identified during PGS’ implementation of an action plan it instituted as a result of audit findings cited by FPSC audit staff in 2013. Following the 2013 audit and 2015 discussions with FPSC staff, PGS took immediate and significant corrective actions. The FPSC audit staff published a follow-up audit report that acknowledged the progress that had been made and found that further improvements were needed. As a result of this report, the Office of Public Counsel (OPC) filed a petition with the FPSC pointing to the violations of rules for safety inspections seeking fines or possible refunds to customers by PGS. On Feb. 25, 2016, the FPSC staff issued a notice informing PGS that the staff would be making a recommendation to the FPSC to initiate a show cause proceeding against PGS for alleged safety rule violations, with total potential penalties of up to $3.9 million. On Apr. 18, 2016, PGS reached a settlement regarding this matter with the OPC and FPSC staff and agreed to pay a $1 million civil penalty and customer refunds of $2 million. The FPSC approved the settlement agreement on May 5, 2016. Superfund and Former Manufactured Gas Plant Sites TEC, through its Tampa Electric and Peoples Gas divisions, is a PRP for certain superfund sites and, through its Peoples Gas division, for certain former manufactured gas plant sites. While the joint and several liability associated with these sites presents the potential for significant response costs, as of Mar. 31, 2016, TEC has estimated its ultimate financial liability to be $33.9 million, primarily at PGS. This amount has been accrued and is primarily reflected in the long-term liability section under “Deferred credits and other liabilities” on the Consolidated Condensed Balance Sheets. The environmental remediation costs associated with these sites, which are expected to be paid over many years, are not expected to have a significant impact on customer rates. The estimated amounts represent only the portion of the cleanup costs attributable to TEC. The estimates to perform the work are based on TEC’s experience with similar work, adjusted for site-specific conditions and agreements with the respective governmental agencies. The estimates are made in current dollars, are not discounted and do not assume any insurance recoveries. In instances where other PRPs are involved, most of those PRPs are creditworthy and are likely to continue to be creditworthy for the duration of the remediation work. However, in those instances that they are not, TEC could be liable for more than TEC’s actual percentage of the remediation costs. Factors that could impact these estimates include the ability of other PRPs to pay their pro-rata portion of the cleanup costs, additional testing and investigation which could expand the scope of the cleanup activities, additional liability that might arise from the cleanup activities themselves or changes in laws or regulations that could require additional remediation. Under current regulations, these costs are recoverable through customer rates established in subsequent base rate proceedings. Letters of Credit A summary of the face amount or maximum theoretical obligation under TEC’s letters of credit as of Mar. 31, 2016 is as follows: Letters of Credit - Tampa Electric Company (millions) After (1) Liabilities Recognized Letters of Credit for the Benefit of: 2016 2017-2020 2020 Total at Mar. 31, 2016 TEC (2) $ 0.0 $ 0.0 $ 0.5 $ 0.5 $ 0.1 (1) (2) The amounts shown are the maximum theoretical amounts guaranteed under current agreements. Liabilities recognized represent the associated obligation under these agreements at Mar. 31, 2016. The obligations under these letters of credit include certain accrued injuries and damages when a letter of credit covers the failure to pay these claims. Financial Covenants In order to utilize its bank credit facilities, TEC must meet certain financial tests, including a debt to capital ratio, as defined in the applicable agreements. In addition, TEC has certain restrictive covenants in specific agreements and debt instruments. At Mar. 31, 2016, TEC was in compliance with all applicable financial covenants.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2016
Segment Information	11. Segment Information TECO Energy is an electric and gas utility holding company with diversified activities. Segments are determined based on how management evaluates, measures and makes decisions with respect to the operations of the entity. The management of TECO Energy reports segments based on each subsidiary’s contribution of revenues, net income and total assets as required by the accounting guidance for disclosures about segments of an enterprise and related information. Intercompany transactions are eliminated in the Consolidated Condensed Financial Statements of TECO Energy, but are included in determining reportable segments. Three months ended Mar. 31, Tampa Electric PGS NMGC (2) TECO Coal (1) Other (2) (3) Eliminations (3) TECO Energy 2016 Revenues - external $ 423.4 $ 126.8 $ 106.6 $ 0.0 $ 2.7 $ 0.0 $ 659.5 Sales to affiliates 1.1 4.4 0.0 0.0 0.0 (5.5 ) 0.0 Total revenues 424.5 131.2 106.6 0.0 2.7 (5.5 ) 659.5 Depreciation and amortization 66.1 14.8 8.4 0.0 0.5 0.0 89.8 Total interest charges 23.8 3.7 3.0 0.0 15.6 (0.2 ) 45.9 Internally allocated interest 0.0 0.0 0.0 0.0 0.2 (0.2 ) 0.0 Provision (benefit) for income taxes 27.8 8.9 9.7 0.0 (10.7 ) 0.0 35.7 Net income (loss) from continuing operations 50.2 13.1 15.2 0.0 (4.8 ) 0.0 73.7 Income (loss) from discontinued operations, net (1) 0.0 0.0 0.0 0.0 0.1 0.0 0.1 Net income (loss) $ 50.2 $ 13.1 $ 15.2 $ 0.0 $ (4.7 ) $ 0.0 $ 73.8 2015 Revenues - external $ 449.8 $ 121.7 $ 119.0 $ 0.0 $ 2.5 $ 0.0 $ 693.0 Sales to affiliates 0.8 1.2 0.0 0.0 0.0 (2.0 ) 0.0 Total revenues 450.6 122.9 119.0 0.0 2.5 (2.0 ) 693.0 Depreciation and amortization 62.9 13.9 8.4 0.0 0.3 0.0 85.5 Total interest charges 23.5 3.5 3.3 0.0 17.9 (0.3 ) 47.9 Internally allocated interest 0.0 0.0 0.0 0.0 0.3 (0.3 ) 0.0 Provision (benefit) for income taxes 27.4 9.2 9.0 0.0 (5.7 ) 0.0 39.9 Net income (loss) from continuing operations 48.2 14.6 13.9 0.0 (12.9 ) 0.0 63.8 Income (loss) from discontinued operations, net (1) 0.0 0.0 0.0 (6.0 ) 0.2 0.0 (5.8 ) Net income (loss) $ 48.2 $ 14.6 $ 13.9 $ (6.0 ) $ (12.7 ) $ 0.0 $ 58.0 At Mar. 31, 2016 Total assets $ 6,988.2 $ 1,147.0 $ 1,210.9 $ 0.0 $ 1,982.1 $ (2,347.1 ) (4) $ 8,981.1 At Dec. 31, 2015 Total assets (3) $ 7,003.8 $ 1,136.1 $ 1,229.7 $ 0.0 $ 1,945.1 $ (2,381.2 ) (4) 8,933.5 (1) All periods have been adjusted to reflect the results from operations to discontinued operations for TECO Coal and certain charges and gains at Other, including Parent and TECO Diversified, that directly relate to TECO Coal and TECO Guatemala. See Note 15 (2) NMGI is included in the Other segment. (3) Certain prior year amounts have been reclassified to conform to current year presentation. (4) Amounts primarily relate to intercompany advances and consolidated tax eliminations.
Tampa Electric Company [Member]
Segment Information	9. Segment Information (millions) Tampa Tampa Electric Three months ended Mar. 31, Electric PGS Eliminations Company 2016 Revenues - external $ 424.2 $ 126.8 $ 0.0 $ 551.0 Intracompany sales 0.3 4.4 (4.7 ) 0.0 Total revenues 424.5 131.2 (4.7 ) 551.0 Depreciation and amortization 66.1 14.8 0.0 80.9 Total interest charges 23.8 3.7 0.0 27.5 Provision for income taxes 27.8 8.9 0.0 36.7 Net income $ 50.2 $ 13.1 $ 0.0 $ 63.3 2015 Revenues - external $ 450.4 $ 121.7 $ 0.0 $ 572.1 Intracompany sales 0.2 1.2 (1.4 ) 0.0 Total revenues 450.6 122.9 (1.4 ) 572.1 Depreciation and amortization 62.9 13.9 0.0 76.8 Total interest charges 23.5 3.5 0.0 27.0 Provision for income taxes 27.4 9.2 0.0 36.6 Net income $ 48.2 $ 14.6 $ 0.0 $ 62.8 Total assets at Mar. 31, 2016 $ 6,600.4 $ 1,109.6 $ (5.2 ) $ 7,704.8 Total assets at Dec. 31, 2015 (1) 6,620.2 1,097.7 (9.3 ) 7,708.6 (1) Certain prior year amounts have been reclassified to conform to current year presentation.

Accounting for Derivative Instr

Accounting for Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2016
Accounting for Derivative Instruments and Hedging Activities	12. Accounting for Derivative Instruments and Hedging Activities From time to time, TECO Energy and its affiliates enter into futures, forwards, swaps and option contracts for the following purposes: · To limit the exposure to price fluctuations for physical purchases and sales of natural gas in the course of normal operations at Tampa Electric, PGS and NMGC; · To optimize the utilization of NMGC’s physical natural gas storage capacity, and · To limit the exposure to interest rate fluctuations on debt securities at TECO Energy and its affiliates. TECO Energy and its affiliates use derivatives only to reduce normal operating and market risks, not for speculative purposes. The regulated utilities’ primary objective in using derivative instruments for regulated operations is to reduce the impact of market price volatility on ratepayers. The risk management policies adopted by TECO Energy provide a framework through which management monitors various risk exposures. Daily and periodic reporting of positions and other relevant metrics are performed by a centralized risk management group, which is independent of all operating companies. The company applies the accounting standards for derivative instruments and hedging activities. These standards require companies to recognize derivatives as either assets or liabilities in the financial statements, to measure those instruments at fair value and to reflect the changes in the fair value of those instruments as either components of OCI or in net income, depending on the designation of those instruments (see Note 13 The company applies the accounting standards for regulated operations to financial instruments used to hedge the purchase and sale of natural gas for the benefit of its regulated companies’ ratepayers. These standards, in accordance with the FPSC and NMPRC, permit the changes in fair value of natural gas derivatives to be recorded as regulatory assets or liabilities reflecting the impact of hedging activities on the fuel recovery clause. As a result, these changes are not recorded in OCI (see Note 3 The company’s physical contracts qualify for the NPNS exception to derivative accounting rules, provided they meet certain criteria. Generally, NPNS applies if the company deems the counterparty creditworthy, if the counterparty owns or controls resources within the proximity to allow for physical delivery of the commodity, if the company intends to receive physical delivery and if the transaction is reasonable in relation to the company’s business needs. As of Mar. 31, 2016, all of the company’s physical contracts qualify for the NPNS exception with the exception of a minor amount of forward purchases and sales entered into by NMGC to optimize its gas storage capacity. The derivatives that are designated as cash flow hedges at Mar. 31, 2016 and Dec. 31, 2015 are reflected on the company’s Consolidated Condensed Balance Sheets and classified accordingly as current and long-term assets and liabilities on a net basis as permitted by their respective master netting agreements. Derivative assets totaled $0.0 million and $0.2 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively, and are included in “Prepayments and other current assets” on the Condensed Consolidated Balance Sheets. Derivative liabilities totaled $23.1 million and $26.2 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively. There are minor offset amount differences between the gross derivative assets and liabilities and the net amounts presented on the Consolidated Condensed Balance Sheets. There was no cash collateral posted with or received from any counterparties. All of the derivative assets and liabilities at Mar. 31, 2016 and Dec. 31, 2015 are designated as hedging instruments, which primarily are derivative hedges of natural gas contracts to limit the exposure to changes in market price for natural gas used to produce energy and natural gas purchased for resale to customers. The corresponding effect of these natural gas related derivatives on the regulated utilities’ fuel recovery clause mechanism is reflected on the Consolidated Condensed Balance Sheets as current and long-term regulatory assets and liabilities. Based on the fair value of the instruments at Mar. 31, 2016, net pretax losses of $22.3 million are expected to be reclassified from regulatory assets or liabilities to the Consolidated Condensed Statements of Income within the next twelve months. The Mar. 31, 2016 and Dec. 31, 2015 balance in AOCI related to the cash flow hedges and interest rate swaps (unsettled and previously settled) is presented in Note 8 For derivative instruments that meet cash flow hedge criteria, the effective portion of the gain or loss on the derivative is reported as a component of OCI and reclassified into earnings in the same period or period during which the hedged transaction affects earnings. Gains and losses on the derivatives representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current earnings. For the three months ended Mar. 31, 2016 and 2015, all hedges were effective. The derivative after-tax effect on OCI and the amount of after-tax gain or loss reclassified from AOCI into earnings for the three months ended Mar. 31, 2016 and 2015 is presented in Note 8 The maximum length of time over which the company is hedging its exposure to the variability in future cash flows extends to Feb. 28, 2018 for financial natural gas contracts. The following table presents the company’s derivative volumes that, as of Mar. 31, 2016, are expected to settle during the 2016, 2017 and 2018 fiscal years: Derivative Volumes Natural Gas Contracts (millions) (MMBTUs) Year Physical Financial 2016 0.0 25.1 2017 0.0 9.9 2018 0.0 0.7 Total 0.0 35.7 The company is exposed to credit risk by entering into derivative instruments with counterparties to limit its exposure to the commodity price fluctuations associated with natural gas. Credit risk is the potential loss resulting from a counterparty’s nonperformance under an agreement. The company manages credit risk with policies and procedures for, among other things, counterparty analysis, exposure measurement and exposure monitoring and mitigation. It is possible that volatility in commodity prices could cause the company to have material credit risk exposures with one or more counterparties. If such counterparties fail to perform their obligations under one or more agreements, the company could suffer a material financial loss. However, as of Mar. 31, 2016, substantially all of the counterparties with transaction amounts outstanding in the company’s energy portfolio were rated investment grade by the major rating agencies. The company assesses credit risk internally for counterparties that are not rated. The company has entered into commodity master arrangements with its counterparties to mitigate credit exposure to those counterparties. The company generally enters into the following master arrangements: (1) EEI agreements—standardized power sales contracts in the electric industry; (2) ISDA agreements—standardized financial gas and electric contracts; and (3) NAESB agreements—standardized physical gas contracts. The company believes that entering into such agreements reduces the risk from default by creating contractual rights relating to creditworthiness, collateral and termination. The company has implemented procedures to monitor the creditworthiness of its counterparties and to consider nonperformance risk in determining the fair value of counterparty positions. Net liability positions generally do not require a nonperformance risk adjustment as the company uses derivative transactions as hedges and has the ability and intent to perform under each of these contracts. In the instance of net asset positions, the company considers general market conditions and the observable financial health and outlook of specific counterparties in evaluating the potential impact of nonperformance risk to derivative positions. Certain TECO Energy derivative instruments contain provisions that require the company’s debt, or in the case of derivative instruments where TEC is the counterparty, TEC’s debt, to maintain an investment grade credit rating from any or all of the major credit rating agencies. If debt ratings, including TEC’s, were to fall below investment grade, it could trigger these provisions, and the counterparties to the derivative instruments could demand immediate and ongoing full overnight collateralization on derivative instruments in net liability positions. The company has no other contingent risk features associated with any derivative instruments.
Tampa Electric Company [Member]
Accounting for Derivative Instruments and Hedging Activities	10. Accounting for Derivative Instruments and Hedging Activities From time to time, TEC enters into futures, forwards, swaps and option contracts for the following purposes: · To limit the exposure to price fluctuations for physical purchases and sales of natural gas in the course of normal operations, and · To limit the exposure to interest rate fluctuations on debt securities. TEC uses derivatives only to reduce normal operating and market risks, not for speculative purposes. TEC’s primary objective in using derivative instruments for regulated operations is to reduce the impact of market price volatility on ratepayers. The risk management policies adopted by TEC provide a framework through which management monitors various risk exposures. Daily and periodic reporting of positions and other relevant metrics are performed by a centralized risk management group, which is independent of all operating companies. TEC applies the accounting standards for derivative instruments and hedging activities. These standards require companies to recognize derivatives as either assets or liabilities in the financial statements, to measure those instruments at fair value and to reflect the changes in the fair value of those instruments as either components of OCI or in net income, depending on the designation of those instruments (see Note 11 TEC applies the accounting standards for regulated operations to financial instruments used to hedge the purchase of natural gas for its regulated companies. These standards, in accordance with the FPSC, permit the changes in fair value of natural gas derivatives to be recorded as regulatory assets or liabilities reflecting the impact of hedging activities on the fuel recovery clause. As a result, these changes are not recorded in OCI (see Note 3 TEC’s physical contracts qualify for the NPNS exception to derivative accounting rules, provided they meet certain criteria. Generally, NPNS applies if TEC deems the counterparty creditworthy, if the counterparty owns or controls resources within the proximity to allow for physical delivery of the commodity, if TEC intends to receive physical delivery and if the transaction is reasonable in relation to TEC’s business needs. As of Mar. 31, 2016, all of TEC’s physical contracts qualify for the NPNS exception. The derivatives that are designated as cash flow hedges at Mar. 31, 2016 and Dec. 31, 2015 are reflected on TEC’s Consolidated Condensed Balance Sheets and classified accordingly as current and long-term assets and liabilities on a net basis as permitted by their respective master netting agreements. There were no derivative assets as of Mar. 31, 2016 and Dec. 31, 2015. Derivative liabilities totaled $23.0 million and $26.2 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively. There are minor offset amount differences between the gross derivative assets and liabilities and the net amounts presented on the Consolidated Condensed Balance Sheets. There was no cash collateral posted with or received from any counterparties. All of the derivative assets and liabilities at Mar. 31, 2016 and Dec. 31, 2015 are designated as hedging instruments, which primarily are derivative hedges of natural gas contracts to limit the exposure to changes in market price for natural gas used to produce energy and natural gas purchased for resale to customers. The corresponding effect of these natural gas related derivatives on the regulated utilities’ fuel recovery clause mechanism is reflected on the Consolidated Condensed Balance Sheets as current and long-term regulatory assets and liabilities. Based on the fair value of the instruments at Mar. 31, 2016, net pretax losses of $22.2 million are expected to be reclassified from regulatory assets or liabilities to the Consolidated Condensed Statements of Income within the next twelve months. The Mar. 31, 2016 and Dec. 31, 2015 balance in AOCI related to the cash flow hedges and interest rate swaps (unsettled and previously settled) is presented in Note 12 For derivative instruments that meet cash flow hedge criteria, the effective portion of the gain or loss on the derivative is reported as a component of OCI and reclassified into earnings in the same period or period during which the hedged transaction affects earnings. Gains and losses on the derivatives representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current earnings. For the three months ended Mar. 31, 2016 and 2015, all hedges were effective. The derivative after-tax effect on OCI and the amount of after-tax gain or loss reclassified from AOCI into earnings for the three months ended Mar. 31, 2016 and 2015 is presented in Note 12 The maximum length of time over which TEC is hedging its exposure to the variability in future cash flows extends to Feb. 28, 2018 for financial natural gas contracts. The following table presents TEC’s derivative volumes that, as of Mar. 31, 2016, are expected to settle during the 2016, 2017 and 2018 fiscal years: Natural Gas Contracts (millions) (MMBTUs) Year Physical Financial 2016 0.0 25.1 2017 0.0 9.9 2018 0.0 0.7 Total 0.0 35.7 TEC is exposed to credit risk by entering into derivative instruments with counterparties to limit its exposure to the commodity price fluctuations associated with natural gas. Credit risk is the potential loss resulting from a counterparty’s nonperformance under an agreement. TEC manages credit risk with policies and procedures for, among other things, counterparty analysis, exposure measurement and exposure monitoring and mitigation. It is possible that volatility in commodity prices could cause TEC to have material credit risk exposures with one or more counterparties. If such counterparties fail to perform their obligations under one or more agreements, TEC could suffer a material financial loss. However, as of Mar. 31, 2016, substantially all of the counterparties with transaction amounts outstanding in TEC’s energy portfolio were rated investment grade by the major rating agencies. TEC assesses credit risk internally for counterparties that are not rated. TEC has entered into commodity master arrangements with its counterparties to mitigate credit exposure to those counterparties. TEC generally enters into the following master arrangements: (1) EEI agreements—standardized power sales contracts in the electric industry; (2) ISDA agreements—standardized financial gas and electric contracts; and (3) NAESB agreements—standardized physical gas contracts. TEC believes that entering into such agreements reduces the risk from default by creating contractual rights relating to creditworthiness, collateral and termination. TEC has implemented procedures to monitor the creditworthiness of its counterparties and to consider nonperformance risk in determining the fair value of counterparty positions. Net liability positions generally do not require a nonperformance risk adjustment as TEC uses derivative transactions as hedges and has the ability and intent to perform under each of these contracts. In the instance of net asset positions, TEC considers general market conditions and the observable financial health and outlook of specific counterparties in evaluating the potential impact of nonperformance risk to derivative positions. Certain TEC derivative instruments contain provisions that require TEC’s debt to maintain an investment grade credit rating from any or all of the major credit rating agencies. If debt ratings were to fall below investment grade, it could trigger these provisions, and the counterparties to the derivative instruments could demand immediate and ongoing full overnight collateralization on derivative instruments in net liability positions. TEC has no other contingent risk features associated with any derivative instruments.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
Fair Value Measurements	13. Fair Value Measurements Items Measured at Fair Value on a Recurring Basis Accounting guidance governing fair value measurements and disclosures provides that fair value represents the amount that would be received in selling an asset or the amount that would be paid in transferring a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that is determined based upon assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, accounting guidance also establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1: Observable inputs, such as quoted prices in active markets; Level 2: Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3: Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions. Assets and liabilities are measured at fair value based on one or more of the following three valuation techniques noted under accounting guidance: (A) Market approach : Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities; (B) Cost approach Amount that would be required to replace the service capacity of an asset (replacement cost); and (C) Income approach Techniques to convert future amounts to a single present amount based upon market expectations (including present value techniques, option-pricing and excess earnings models). The fair value of financial instruments is determined by using various market data and other valuation techniques. The following tables set forth by level within the fair value hierarchy, the company’s financial assets and liabilities that were accounted for at fair value on a recurring basis as of Mar. 31, 2016 and Dec. 31, 2015. As required by accounting standards for fair value measurements, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. Recurring Fair Value Measures As of Mar. 31, 2016 (millions) Level 1 Level 2 Level 3 Total Liabilities Natural gas derivatives $ 0.0 $ 23.1 $ 0.0 $ 23.1 As of Dec. 31, 2015 (millions) Level 1 Level 2 Level 3 Total Assets Natural gas derivatives $ 0.0 $ 0.2 $ 0.0 $ 0.2 Liabilities Natural gas derivatives $ 0.0 $ 26.2 $ 0.0 $ 26.2 The natural gas derivatives are OTC swap, forward and option instruments. Fair values of swaps and forwards are estimated utilizing the market approach. The price of swaps and forwards are calculated using observable NYMEX quoted closing prices of exchange-traded futures. Fair values of options are estimated utilizing the income approach. The price of options is calculated using the Black-Scholes model with observable exchange-traded futures as the primary pricing inputs to the model. Additional inputs to the model include historical volatility, discount rate, and a locational basis adjustment to NYMEX. The resulting prices are applied to the notional quantities of active swap, forward and option positions to determine the fair value (see Note 12 The company considered the impact of nonperformance risk in determining the fair value of derivatives. The company considered the net position with each counterparty, past performance of both parties, the intent of the parties, indications of credit deterioration and whether the markets in which the company transacts have experienced dislocation. At Mar. 31, 2016, the fair value of derivatives was not materially affected by nonperformance risk. There were no Level 3 assets or liabilities for the periods presented.
Tampa Electric Company [Member]
Fair Value Measurements	11. Fair Value Measurements Items Measured at Fair Value on a Recurring Basis Accounting guidance governing fair value measurements and disclosures provides that fair value represents the amount that would be received in selling an asset or the amount that would be paid in transferring a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that is determined based upon assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, accounting guidance also establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1: Observable inputs, such as quoted prices in active markets; Level 2: Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3: Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions. Assets and liabilities are measured at fair value based on one or more of the following three valuation techniques noted under accounting guidance: (A) Market approach : Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities; (B) Cost approach Amount that would be required to replace the service capacity of an asset (replacement cost); and (C) Income approach Techniques to convert future amounts to a single present amount based upon market expectations (including present value techniques, option-pricing and excess earnings models). The fair value of financial instruments is determined by using various market data and other valuation techniques. The following tables set forth by level within the fair value hierarchy, TEC’s financial assets and liabilities that were accounted for at fair value on a recurring basis as of Mar. 31, 2016 and Dec. 31, 2015. As required by accounting standards for fair value measurements, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. TEC’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. Recurring Derivative Fair Value Measures As of Mar. 31, 2016 (millions) Level 1 Level 2 Level 3 Total Liabilities Natural gas swaps $ 0.0 $ 23.0 $ 0.0 $ 23.0 As of Dec. 31, 2015 (millions) Level 1 Level 2 Level 3 Total Liabilities Natural gas swaps $ 0.0 $ 26.2 $ 0.0 $ 26.2 Natural gas swaps are OTC swap instruments. The fair value of the swaps is estimated utilizing the market approach. The price of swaps is calculated using observable NYMEX quoted closing prices of exchange-traded futures. These prices are applied to the notional quantities of active positions to determine the reported fair value (see Note 10 TEC considered the impact of nonperformance risk in determining the fair value of derivatives. TEC considered the net position with each counterparty, past performance of both parties, the intent of the parties, indications of credit deterioration and whether the markets in which TEC transacts have experienced dislocation. At Mar. 31, 2016, the fair value of derivatives was not materially affected by nonperformance risk. There were no Level 3 assets or liabilities for the periods presented.

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2016
Variable Interest Entities	14. Variable Interest Entities The determination of a VIE’s primary beneficiary is the enterprise that 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. Tampa Electric has entered into multiple PPAs with wholesale energy providers in Florida to ensure the ability to meet customer energy demand and to provide lower cost options in the meeting of this demand. These agreements range in size from 117 MW to 250 MW of available capacity, are with similar entities and contain similar provisions. Because some of these provisions provide for the transfer or sharing of a number of risks inherent in the generation of energy, these agreements meet the definition of being variable interests. These risks include: operating and maintenance, regulatory, credit, commodity/fuel and energy market risk. Tampa Electric has reviewed these risks and has determined that the owners of these entities have retained the majority of these risks over the expected life of the underlying generating assets, have the power to direct the most significant activities, and have the obligation or right to absorb losses or benefits. As a result, Tampa Electric is not the primary beneficiary and is not required to consolidate any of these entities. Tampa Electric purchased $12.6 million and $5.4 million under these PPAs for the three months ended Mar. 31, 2016 and 2015, respectively. The company does not provide any material financial or other support to any of the VIEs it is involved with, nor is the company under any obligation to absorb losses associated with these VIEs. In the normal course of business, the company’s involvement with these VIEs does not affect its Consolidated Condensed Balance Sheets, Statements of Income or Cash Flows.
Tampa Electric Company [Member]
Variable Interest Entities	13. Variable Interest Entities The determination of a VIE’s primary beneficiary is the enterprise that 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. Tampa Electric has entered into multiple PPAs with wholesale energy providers in Florida to ensure the ability to meet customer energy demand and to provide lower cost options in the meeting of this demand. These agreements range in size from 117 MW to 250 MW of available capacity, are with similar entities and contain similar provisions. Because some of these provisions provide for the transfer or sharing of a number of risks inherent in the generation of energy, these agreements meet the definition of being variable interests. These risks include: operating and maintenance, regulatory, credit, commodity/fuel and energy market risk. Tampa Electric has reviewed these risks and has determined that the owners of these entities have retained the majority of these risks over the expected life of the underlying generating assets, have the power to direct the most significant activities, and have the obligation or right to absorb losses or benefits. As a result, Tampa Electric is not the primary beneficiary and is not required to consolidate any of these entities. Tampa Electric purchased $12.6 million and $5.4 million under these PPAs for the three months ended Mar. 31, 2016 and 2015, respectively. TEC does not provide any material financial or other support to any of the VIEs it is involved with, nor is TEC under any obligation to absorb losses associated with these VIEs. In the normal course of business, TEC’s involvement with these VIEs does not affect its Consolidated Condensed Balance Sheets, Statements of Income or Cash Flows.

Discontinued Operations and Ass

Discontinued Operations and Asset Impairments	3 Months Ended
	Mar. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations and Asset Impairments	15. Discontinued Operations and Asset Impairments TECO Coal On Sept. 21, 2015, TECO Energy’s subsidiary, TECO Diversified, entered into an SPA and completed the sale of all of its ownership interest in TECO Coal to Cambrian. The SPA did not provide for an up-front purchase payment, but provides for future contingent consideration of up to $60 million that may be paid yearly through 2019 if certain coal benchmark prices reach certain levels. The 2015 benchmark price was not reached and no contingent consideration payment was triggered. TECO Energy retains certain deferred tax assets and personnel-related liabilities, but all other TECO Coal assets and liabilities, including working capital, asset retirement obligations and workers compensation reserves, were transferred in the transaction. Letters of indemnity related to TECO Coal reclamation bonds will remain in effect until the bonds are replaced by Cambrian, which is expected to be completed in 2016 (see description of guarantees in Note 10 Note 10 Since the closing of the sale, TECO Energy does not have influence over operations of TECO Coal, therefore the contingent payments are not considered to meet the definition of direct cash flows under the applicable discontinued operations FASB guidance. TECO Guatemala In 2012, TECO Guatemala completed the sale of its interests in the Alborada and San José power stations, and related solid fuel handling and port facilities in Guatemala. All periods presented reflect the classification of results from operations for TECO Guatemala and certain charges at Parent that directly relate to TECO Guatemala as discontinued operations. While TECO Energy and its subsidiaries no longer have assets or operations in Guatemala, its subsidiary, TECO Guatemala Holdings, LLC, has retained its rights under its arbitration claim filed against the Republic of Guatemala (see Note 10 Combined Components of Discontinued Operations The following table provides selected components of discontinued operations related to the sales of TECO Coal and TECO Guatemala: Components of income from discontinued operations Three months ended Mar. 31, (millions) 2016 2015 Revenues—TECO Coal $ 0.0 $ 72.7 Loss from operations—TECO Coal 0.0 (9.5 ) Loss from operations—TECO Guatemala 0.0 (0.1 ) Income (loss) from discontinued operations—TECO Coal 0.2 (9.5 ) Loss from discontinued operations—TECO Guatemala 0.0 (0.1 ) Income (loss) from discontinued operations 0.2 (9.6 ) Provision (benefit) for income taxes 0.1 (3.8 ) Income (loss) from discontinued operations, net $ 0.1 $ (5.8 )

Mergers and Acquisitions

Mergers and Acquisitions	3 Months Ended
	Mar. 31, 2016
Mergers and Acquisitions	16. Mergers and Acquisitions Pending Merger with Emera Inc. On Sept. 4, 2015, TECO Energy and Emera entered into the Merger Agreement. Upon closing of the Merger, TECO Energy will become a wholly owned indirect subsidiary of Emera. Upon the terms and subject to the conditions set forth in the Merger Agreement, which was unanimously approved and adopted by the board of directors of TECO Energy, at the effective time, Merger Sub will merge with and into TECO Energy with TECO Energy continuing as the surviving corporation. Pursuant to the Merger Agreement, upon the closing of the Merger, which is expected to occur in the summer of 2016, each issued and outstanding share of TECO Energy common stock will be cancelled and converted automatically into the right to receive $27.55 in cash, without interest (Merger Consideration). This represents an aggregate purchase price of approximately $10.4 billion including assumption of approximately $3.9 billion of debt. The closing of the Merger is subject to certain conditions, including, among others, (i) approval of TECO Energy shareholders representing a majority of the outstanding shares of TECO Energy common stock (which approval was obtained at the special meeting of shareholders held on Dec. 3, 2015), (ii) expiration or termination of the applicable Hart-Scott-Rodino Act waiting period (which expired on Feb. 5, 2016), (iii) receipt of all required regulatory approvals, including from the FERC, the NMPRC and the Committee on Foreign Investment in the United States (which, with respect to the FERC and the Committee on Foreign Investment in the United States, was obtained on Jan. 20, 2016 and Mar. 23, 2016, respectively), (iv) the absence of any law or judgment that prevents, makes illegal or prohibits the closing of the Merger, (v) the absence of any material adverse effect with respect to TECO Energy and (vi) subject to certain exceptions, the accuracy of the representations and warranties of, and compliance with covenants by, each of the parties to the Merger Agreement. On Apr. 11, 2016, Emera and TECO Energy filed with the NMPRC an unopposed stipulation agreement reflecting a settlement reached with certain intervening parties in the acquisition case currently pending before the NMPRC for approval of the transaction. In the stipulation, the parties state that they believe the settlement is in the public interest and have recommended approval to the NMPRC. Amongst other elements, the stipulation includes Emera’s agreement to maintain the commitments made by TECO Energy in its 2014 case relating to its acquisition of NMGC, invest in the expansion of the natural gas system to underserved communities and the Mexican border, and provide resources to support certain economic growth projects and programs. The stipulation is subject to review and approval by the NMPRC. The NMPRC hearing to consider the acquisition is scheduled to begin in May 2016. The Merger Agreement contains customary representations, warranties and covenants of TECO Energy, Emera and Merger Sub. The Merger Agreement contains covenants by TECO Energy, among others, that (i) TECO Energy will conduct its business in the ordinary course during the interim period between the execution of the Merger Agreement and the closing of the Merger and (ii) TECO Energy will not engage in certain transactions during such interim period. The Merger Agreement contains covenants by Emera, among others, that Emera will use its reasonable best efforts to take all actions necessary to obtain all governmental and regulatory approvals. In addition, the Merger Agreement requires Emera (i) to maintain TECO Energy’s historic levels of community involvement and charitable contributions and support in TECO Energy’s existing service territories, (ii) to maintain TECO Energy’s headquarters in Tampa, Florida, (iii) to honor current union contracts in accordance with their terms and (iv) to provide each continuing non-union employee, for a period of two years following the closing of the Merger, with a base salary or wage rate no less favorable than, and incentive compensation and employee benefits, respectively, substantially comparable in the aggregate to those, that they received as of immediately prior to the closing. TECO Energy is also subject to a “no shop” restriction that limits its ability to solicit alternative acquisition proposals or provide nonpublic information to, and engage in discussion with, third parties. Either party may terminate the Merger Agreement if (i) the closing of the Merger has not occurred by Sept. 30, 2016 (subject to a 6-month extension if required to obtain necessary regulatory approvals) or (ii) a law or judgment preventing or prohibiting the closing of the Merger has become final. If the Merger Agreement is terminated under certain circumstances, including the failure to obtain required regulatory approvals, Emera must pay TECO Energy a termination fee of $326.9 million. During the three months ended Mar. 31, 2016, TECO Energy incurred approximately $0.1 million pretax of incremental transaction-related costs, which are included in “Operations and maintenance other expense” on the Consolidated Condensed Statements of Income.
Tampa Electric Company [Member]
Mergers and Acquisitions	14. Mergers and Acquisitions Pending Merger with Emera Inc. On Sept. 4, 2015, TECO Energy and Emera entered into the Merger Agreement. Upon closing of the Merger, TECO Energy will become a wholly owned indirect subsidiary of Emera. Upon the terms and subject to the conditions set forth in the Merger Agreement, which was unanimously approved and adopted by the board of directors of TECO Energy, at the effective time, Merger Sub will merge with and into TECO Energy with TECO Energy continuing as the surviving corporation. Pursuant to the Merger Agreement, upon the closing of the Merger, which is expected to occur in the summer of 2016, each issued and outstanding share of TECO Energy common stock will be cancelled and converted automatically into the right to receive $27.55 in cash, without interest (Merger Consideration). This represents an aggregate purchase price of approximately $10.4 billion including assumption of approximately $3.9 billion of debt (of which TEC’s portion of debt was $2.3 billion). The closing of the Merger is subject to certain conditions, including, among others, (i) approval of TECO Energy shareholders representing a majority of the outstanding shares of TECO Energy common stock (which approval was obtained at the special meeting of shareholders held on Dec. 3, 2015), (ii) expiration or termination of the applicable Hart-Scott-Rodino Act waiting period (which expired on Feb. 5, 2016), (iii) receipt of all required regulatory approvals, including from the FERC, the NMPRC and the Committee on Foreign Investment in the United States (which, with respect to the FERC and the Committee on Foreign Investment in the United States, was obtained on Jan. 20, 2016 and Mar. 23, 2016, respectively), (iv) the absence of any law or judgment that prevents, makes illegal or prohibits the closing of the Merger, (v) the absence of any material adverse effect with respect to TECO Energy and (vi) subject to certain exceptions, the accuracy of the representations and warranties of, and compliance with covenants by, each of the parties to the Merger Agreement. On Apr. 11, 2016, Emera and TECO Energy filed with the NMPRC an unopposed stipulation agreement reflecting a settlement reached with certain intervening parties in the acquisition case currently pending before the NMPRC for approval of the transaction. The stipulation is subject to review and approval by the NMPRC. The NMPRC hearing to consider the acquisition is scheduled to begin in May 2016. TECO Energy is also subject to a “no shop” restriction that limits its ability to solicit alternative acquisition proposals or provide nonpublic information to, and engage in discussion with, third parties. Either party may terminate the Merger Agreement if (i) the closing of the Merger has not occurred by Sept. 30, 2016 (subject to a 6-month extension if required to obtain necessary regulatory approvals) or (ii) a law or judgment preventing or prohibiting the closing of the Merger has become final. If the Merger Agreement is terminated under certain circumstances, including the failure to obtain required regulatory approvals, Emera must pay TECO Energy a termination fee of $326.9 million.

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation 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 TECO Energy, Inc. and its subsidiaries as of Mar. 31, 2016 and Dec. 31, 2015, and the results of operations and cash flows for the periods ended Mar. 31, 2016 and 2015. The results of operations for the three months ended Mar. 31, 2016 are not necessarily indicative of the results that can be expected for the entire fiscal year ending Dec. 31, 2016. The use of estimates is inherent in the preparation of financial statements in accordance with U.S. 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 U.S. GAAP. On Sept. 4, 2015, TECO Energy and Emera entered into the Merger Agreement. Upon closing, TECO Energy will become a wholly owned indirect subsidiary of Emera. See Note 16
Revenues	Revenues As of Mar. 31, 2016 and Dec. 31, 2015, unbilled revenues of $67.3 million and $81.1 million, respectively, are included in the “Receivables” line item on the Consolidated Condensed Balance Sheets.
Accounting for Franchise Fees and Gross Receipt Taxes	Accounting for Franchise Fees and Gross Receipt Taxes Tampa Electric and PGS are allowed to recover certain costs from customers on a dollar-per-dollar basis through prices 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. Franchise fees and gross receipt taxes payable by Tampa Electric and PGS are included as an expense on the Consolidated Condensed Statements of Income in “Taxes, other than income”. These amounts totaled $27.9 million and $27.4 million for the three months ended Mar. 31, 2016 and 2015, respectively. NMGC is an agent in the collection and payment of franchise fees and gross receipt taxes and is not required by a tariff to present the amounts on a gross basis. Therefore, NMGC’s franchise fees and gross receipt taxes are presented net with no line-item impact on the Consolidated Condensed Statements of Income.
Tampa Electric Company [Member]
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation TEC is a wholly owned subsidiary of TECO Energy. For the purposes of its consolidated financial reporting, TEC 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. For the periods presented, no VIEs have been consolidated (see Note 13 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 TEC as of Mar. 31, 2016 and Dec. 31, 2015, and the results of operations and cash flows for the periods ended Mar. 31, 2016 and 2015. The results of operations for the three months ended Mar. 31, 2016 are not necessarily indicative of the results that can be expected for the entire fiscal year ending Dec. 31, 2016. The use of estimates is inherent in the preparation of financial statements in accordance with U.S. 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 U.S. GAAP. On Sept. 4, 2015, TECO Energy and Emera entered into the Merger Agreement. Upon closing, TECO Energy will become a wholly owned indirect subsidiary of Emera. See Note 14
Revenues	Revenues As of Mar. 31, 2016 and Dec. 31, 2015, unbilled revenues of $56.8 million and $53.7 million, respectively, are included in the “Receivables” line item on the Consolidated Condensed Balance Sheets.
Accounting for Franchise Fees and Gross Receipt Taxes	Accounting for Franchise Fees and Gross Receipts Tampa Electric and PGS are allowed to recover certain costs from customers on a dollar-per-dollar basis through prices 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. Franchise fees and gross receipt taxes payable by Tampa Electric and PGS are included as an expense on the Consolidated Condensed Statements of Income in “Taxes, other than income”. These amounts totaled $27.9 million and $27.4 million for the three months ended Mar. 31, 2016 and 2015, respectively.

Regulatory (Tables)

Regulatory (Tables)	3 Months Ended
	Mar. 31, 2016
Schedule of Regulatory Assets and Regulatory Liabilities	Details of the regulatory assets and liabilities as of Mar. 31, 2016 and Dec. 31, 2015 are presented in the following table: Regulatory Assets and Liabilities (millions) Mar. 31, 2016 Dec. 31, 2015 Regulatory assets: Regulatory tax asset (1) $ 77.1 $ 74.7 Cost-recovery clauses - deferred balances (2) 0.1 5.5 Cost-recovery clauses - offsets to derivative liabilities (2) 26.0 26.5 Environmental remediation (3) 54.4 54.0 Postretirement benefits (4) 238.5 240.6 Deferred bond refinancing costs (5) 6.2 6.5 Debt basis adjustment (6) 16.7 17.5 Competitive rate adjustment (2) 2.5 2.6 Other 12.1 12.1 Total regulatory assets 433.6 440.0 Less: Current portion 40.2 44.8 Long-term regulatory assets $ 393.4 $ 395.2 Regulatory liabilities: Regulatory tax liability $ 7.6 $ 7.9 Cost-recovery clauses (2) 80.0 55.9 Transmission and delivery storm reserve 56.1 56.1 Accumulated reserve - cost of removal (7) 673.6 679.9 Other 0.5 0.8 Total regulatory liabilities 817.8 800.6 Less: Current portion 108.4 84.8 Long-term regulatory liabilities $ 709.4 $ 715.8 (1) The regulatory tax asset is primarily associated with the depreciation and recovery of AFUDC-equity. This asset does not earn a return but rather is included in capital structure, which is used in the calculation of the weighted cost of capital used to determine revenue requirements. It will be recovered over the expected life of the related assets. (2) These assets and liabilities are related to FPSC and NMPRC clauses and riders. They are recovered or refunded through cost-recovery mechanisms approved by the FPSC or NMPRC, as applicable, on a dollar-for-dollar basis in the next year. In the case of the regulatory asset related to derivative liabilities, recovery occurs in the year following the settlement of the derivative position. (3) This asset is related to costs associated with environmental remediation primarily at manufactured gas plant sites. The balance is included in rate base, partially offsetting the related liability, and earns a rate of return as permitted by the FPSC. The timing of recovery is impacted by the timing of the expenditures related to remediation. (4) This asset is related to the deferred costs of postretirement benefits. It is included in rate base and earns a rate of return as permitted by the FPSC or NMPRC, as applicable. It is amortized over the remaining service life of plan participants. (5) This asset represents the past costs associated with refinancing debt. It does not earn a return but rather is included in capital structure, which is used in the calculation of the weighted cost of capital used to determine revenue requirements. It will be amortized over the term of the related debt instruments. (6) This asset represents the difference between the fair value and pre-merger carrying amounts for NMGC’s long-term debt on the acquisition date. It does not earn a return and is not included in the regulatory capital structure. It is amortized over the term of the related debt instrument. (7) This item represents the non-ARO cost of removal in the accumulated reserve for depreciation.
Tampa Electric Company [Member]
Schedule of Regulatory Assets and Regulatory Liabilities	Details of the regulatory assets and liabilities as of Mar. 31, 2016 and Dec. 31, 2015 are presented in the following table: Regulatory Assets and Liabilities (millions) Mar. 31, 2016 Dec. 31, 2015 Regulatory assets: Regulatory tax asset (1) $ 77.0 $ 74.6 Cost-recovery clauses - deferred balances (2) 0.0 5.2 Cost-recovery clauses - offsets to derivative liabilities (2) 25.9 26.2 Environmental remediation (3) 54.4 54.0 Postretirement benefits (4) 236.4 238.3 Deferred bond refinancing costs (5) 6.2 6.5 Competitive rate adjustment (2) 2.5 2.6 Other 10.6 10.7 Total regulatory assets 413.0 418.1 Less: Current portion 39.9 44.3 Long-term regulatory assets $ 373.1 $ 373.8 Regulatory liabilities: Regulatory tax liability $ 5.6 $ 5.7 Cost-recovery clauses (2) 76.1 54.2 Transmission and delivery storm reserve 56.1 56.1 Accumulated reserve - cost of removal (6) 561.7 570.0 Other 0.5 0.7 Total regulatory liabilities 700.0 686.7 Less: Current portion 104.5 83.2 Long-term regulatory liabilities $ 595.5 $ 603.5 (1) The regulatory tax asset is primarily associated with the depreciation and recovery of AFUDC-equity. This asset does not earn a return but rather is included in capital structure, which is used in the calculation of the weighted cost of capital used to determine revenue requirements. It will be recovered over the expected life of the related assets. (2) These assets and liabilities are related to FPSC clauses and riders. They are recovered or refunded through cost-recovery mechanisms approved by the FPSC on a dollar-for-dollar basis in the next year. In the case of the regulatory asset related to derivative liabilities, recovery occurs in the year following the settlement of the derivative position. (3) This asset is related to costs associated with environmental remediation primarily at manufactured gas plant sites. The balance is included in rate base, partially offsetting the related liability, and earns a rate of return as permitted by the FPSC. The timing of recovery is impacted by the timing of the expenditures related to remediation. (4) This asset is related to the deferred costs of postretirement benefits. It is included in rate base and earns a rate of return as permitted by the FPSC. It is amortized over the remaining service life of plan participants. (5) This asset represents the past costs associated with refinancing debt. It does not earn a return but rather is included in capital structure, which is used in the calculation of the weighted cost of capital used to determine revenue requirements. It will be amortized over the term of the related debt instruments. (6) This item represents the non-ARO cost of removal in the accumulated reserve for depreciation.

Employee Postretirement Benef26

Employee Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Schedule of Net Periodic Benefit Cost	Included in the table below is the periodic expense for pension and other postretirement benefits offered by the company. Amounts disclosed for pension benefits include the amounts related to the qualified pension plan and the non-qualified, non-contributory SERP. Pension Expense (millions) Pension Benefits Other Postretirement Benefits Three months ended Mar. 31, 2016 2015 2016 2015 Components of net periodic benefit expense Service cost $ 4.4 $ 4.5 $ 0.5 $ 0.6 Interest cost 8.1 7.4 2.2 2.0 Expected return on assets (11.3 ) (10.8 ) (0.3 ) (0.3 ) Amortization of: Prior service (benefit) cost 0.0 (0.1 ) (0.6 ) (0.6 ) Actuarial loss 3.4 3.4 0.0 0.0 Regulatory asset 0.0 0.0 0.2 0.3 Net pension expense recognized in the TECO Energy Consolidated Condensed Statements of Income $ 4.6 $ 4.4 $ 2.0 $ 2.0

Short-Term Debt (Tables)

Short-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2016
Short-Term Debt Credit Facilities	At Mar. 31, 2016 and Dec. 31, 2015, the following credit facilities and related borrowings existed: Credit Facilities Mar. 31, 2016 Dec. 31, 2015 Letters Letters Credit Borrowings of Credit Credit Borrowings of Credit (millions) Facilities Outstanding (1) Outstanding Facilities Outstanding (1) Outstanding Tampa Electric Company: 5-year facility (2) $ 325.0 $ 0.0 $ 0.5 $ 325.0 $ 0.0 $ 0.5 3-year accounts receivable facility (3) 150.0 0.0 0.0 150.0 61.0 0.0 TECO Energy/TECO Finance: 5-year facility (2)(4) 300.0 113.0 0.0 300.0 163.0 0.0 1-year term facility (4)(5) 400.0 400.0 0.0 0.0 0.0 0.0 New Mexico Gas Company: 5-year facility (2) 125.0 0.0 1.7 125.0 23.0 1.7 Total $ 1,300.0 $ 513.0 $ 2.2 $ 900.0 $ 247.0 $ 2.2 (1) Borrowings outstanding are reported as notes payable. (2) This 5-year facility matures Dec. 17, 2018. (3) Prior to Mar. 24, 2015, this was a 1-year facility. This 3-year facility matures Mar. 23, 2018. (4) TECO Finance is the borrower and TECO Energy is the guarantor of this facility. (5) This 1-year facility matures Mar. 14, 2017.
Tampa Electric Company [Member]
Short-Term Debt Credit Facilities	At Mar. 31, 2016 and Dec. 31, 2015, the following credit facilities and related borrowings existed: Credit Facilities Mar. 31, 2016 Dec. 31, 2015 Letters Letters Credit Borrowings of Credit Credit Borrowings of Credit (millions) Facilities Outstanding (1) Outstanding Facilities Outstanding (1) Outstanding Tampa Electric Company: 5-year facility (2) $ 325.0 $ 0.0 $ 0.5 $ 325.0 $ 0.0 $ 0.5 3-year accounts receivable facility (3) 150.0 0.0 0.0 150.0 61.0 0.0 Total $ 475.0 $ 0.0 $ 0.5 $ 475.0 $ 61.0 $ 0.5 (1) Borrowings outstanding are reported as notes payable. (2) This 5-year facility matures Dec. 17, 2018. (3) Prior to Mar. 24, 2015, this was a 1-year facility. This 3-year facility matures Mar. 23, 2018.

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2016
Other Comprehensive Income	TECO Energy reported the following OCI for the three months ended Mar. 31, 2016 and 2015 related to changes in the fair value of cash flow hedges and amortization of unrecognized benefit costs associated with the company’s postretirement plans: Other Comprehensive Income Three months ended Mar. 31, (millions) Gross Tax Net 2016 Unrealized gain on cash flow hedges $ 0.0 $ 0.0 $ 0.0 Reclassification from AOCI to net income (1) 0.3 (0.1 ) 0.2 Gain on cash flow hedges 0.3 (0.1 ) 0.2 Amortization of unrecognized benefit costs (2) 0.8 (0.3 ) 0.5 Total other comprehensive income $ 1.1 $ (0.4 ) $ 0.7 2015 Unrealized gain on cash flow hedges $ 0.3 $ (0.2 ) $ 0.1 Reclassification from AOCI to net income (1) 0.4 (0.2 ) 0.2 Gain on cash flow hedges 0.7 (0.4 ) 0.3 Amortization of unrecognized benefit costs (2) 0.9 (0.3 ) 0.6 Total other comprehensive income $ 1.6 $ (0.7 ) $ 0.9 (1) Related to interest rate contracts recognized in Interest expense. (2) Related to postretirement and postemployment benefits. See Note 5
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss (millions) Mar. 31, 2016 Dec. 31, 2015 Unamortized pension loss and prior service credit (1) $ (33.6 ) $ (34.2 ) Unamortized other benefit gains, prior service costs and transition obligations (2) 25.5 25.6 Net unrealized losses from cash flow hedges (3) (3.4 ) (3.6 ) Total accumulated other comprehensive loss $ (11.5 ) $ (12.2 ) (1) Net of tax benefit of $21.1 million and $21.5 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively. (2) Net of tax expense of $16.0 million and $16.1 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively. (3) Net of tax benefit of $2.1 million and $2.3 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively.
Tampa Electric Company [Member]
Other Comprehensive Income	Other Comprehensive Income Three months ended Mar. 31, (millions) Gross Tax Net 2016 Unrealized gain on cash flow hedges $ 0.0 $ 0.0 $ 0.0 Reclassification from AOCI to net income 0.3 (0.1 ) 0.2 Gain on cash flow hedges 0.3 (0.1 ) 0.2 Total other comprehensive income $ 0.3 $ (0.1 ) $ 0.2 2015 Unrealized gain on cash flow hedges $ 0.3 $ (0.2 ) $ 0.1 Reclassification from AOCI to net income 0.4 (0.2 ) 0.2 Gain on cash flow hedges 0.7 (0.4 ) 0.3 Total other comprehensive income $ 0.7 $ (0.4 ) $ 0.3
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss (millions) Mar. 31, 2016 Dec. 31, 2015 Net unrealized losses from cash flow hedges (1) $ (3.4 ) $ (3.6 ) Total accumulated other comprehensive loss $ (3.4 ) $ (3.6 ) (1) Net of tax benefit of $2.1 million and $2.3 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	For the three months ended Mar. 31, (millions, except per share amounts) 2016 2015 Basic earnings per share Net income from continuing operations $ 73.7 $ 63.8 Amount allocated to nonvested participating shareholders (0.1 ) (0.2 ) Income before discontinued operations available to common shareholders - Basic $ 73.6 $ 63.6 Income (loss) from discontinued operations, net $ 0.1 $ (5.8 ) Amount allocated to nonvested participating shareholders 0.0 0.0 Income (loss) from discontinued operations available to common shareholders - Basic $ 0.1 $ (5.8 ) Net income $ 73.8 $ 58.0 Amount allocated to nonvested participating shareholders (0.1 ) (0.2 ) Net income available to common shareholders - Basic $ 73.7 $ 57.8 Average common shares outstanding - Basic 234.0 232.8 Earnings per share from continuing operations available to common shareholders - Basic $ 0.31 $ 0.27 Earnings per share from discontinued operations available to common shareholders - Basic 0.0 $ (0.02 ) Earnings per share available to common shareholders - Basic $ 0.31 $ 0.25 Diluted earnings per share Net income from continuing operations $ 73.7 $ 63.8 Amount allocated to nonvested participating shareholders (0.1 ) (0.2 ) Income before discontinued operations available to common shareholders - Diluted $ 73.6 $ 63.6 Income (loss) from discontinued operations, net $ 0.1 $ (5.8 ) Amount allocated to nonvested participating shareholders 0.0 0.0 Income (loss) from discontinued operations available to common shareholders - Diluted $ 0.1 $ (5.8 ) Net income $ 73.8 $ 58.0 Amount allocated to nonvested participating shareholders (0.1 ) (0.2 ) Net income available to common shareholders - Diluted $ 73.7 $ 57.8 Unadjusted average common shares outstanding - Diluted 234.0 232.8 Assumed conversion of stock options, unvested restricted stock, unvested RSUs and contingent performance shares, net 1.2 0.7 Average common shares outstanding - Diluted 235.2 233.5 Earnings per share from continuing operations available to common shareholders - Diluted $ 0.31 $ 0.27 Earnings per share from discontinued operations available to common shareholders - Diluted 0.0 $ (0.02 ) Earnings per share available to common shareholders - Diluted $ 0.31 $ 0.25 Anti-dilutive shares 0.2 0.1

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2016
Letters of Credit and Guarantees	A summary of the face amount or maximum theoretical obligation and the year of expiration under letters of credit and guarantees as of Mar. 31, 2016 is as follows: (millions) Maximum After (1) Theoretical Liabilities Recognized Guarantees for the Benefit of: 2016 2017-2020 2020 Obligation at Mar. 31, 2016 TECO Energy Fuel sales and transportation (2) $ 0.0 $ 0.0 $ 92.9 $ 92.9 $ 0.0 Letters of indemnity - coal mining permits (3) 89.4 0.0 0.0 89.4 0.0 $ 89.4 $ 0.0 $ 92.9 $ 182.3 $ 0.0 Maximum (millions) After (1) Theoretical Liabilities Recognized Letters of Credit for the Benefit of: 2016 2017-2020 2020 Obligation at Mar. 31, 2016 (4) TEC $ 0.0 $ 0.0 $ 0.5 $ 0.5 $ 0.1 NMGC 0.0 0.0 1.7 1.7 0.0 $ 0.0 $ 0.0 $ 2.2 $ 2.2 $ 0.1 (1) These letters of credit and guarantees renew annually and are shown on the basis that they will continue to renew beyond 2020. (2) The amounts shown represent the maximum theoretical amounts of cash collateral that TECO Energy would be required to post in the event of a downgrade below investment grade for its long-term debt ratings by the major credit rating agencies. Liabilities recognized represent the associated potential obligation related to net derivative liabilities under these agreements at Mar. 31, 2016. See Note 12 (3) These letters of indemnity guarantee payments to certain surety companies that issued reclamation bonds to the Commonwealths of Kentucky and Virginia in connection with TECO Coal's mining operations. Payments to the surety companies would be triggered if the reclamation bonds are called upon by either of these states and the permit holder, TECO Coal, does not pay the surety. The amounts shown represent the maximum theoretical amounts that TECO Energy would be required to pay to the surety companies. As discussed in Note 15 (4) The amounts shown are the maximum theoretical amounts guaranteed under current agreements. Liabilities recognized represent the associated obligation of TECO Energy, TEC or NMGC under these agreements at Mar. 31, 2016. The obligations under these letters of credit include certain accrued injuries and damages when a letter of credit covers the failure to pay these claims.
Tampa Electric Company [Member]
Letters of Credit and Guarantees	A summary of the face amount or maximum theoretical obligation under TEC’s letters of credit as of Mar. 31, 2016 is as follows: Letters of Credit - Tampa Electric Company (millions) After (1) Liabilities Recognized Letters of Credit for the Benefit of: 2016 2017-2020 2020 Total at Mar. 31, 2016 TEC (2) $ 0.0 $ 0.0 $ 0.5 $ 0.5 $ 0.1 (1) (2) The amounts shown are the maximum theoretical amounts guaranteed under current agreements. Liabilities recognized represent the associated obligation under these agreements at Mar. 31, 2016. The obligations under these letters of credit include certain accrued injuries and damages when a letter of credit covers the failure to pay these claims.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2016
Schedule of Segment Information	TECO Energy is an electric and gas utility holding company with diversified activities. Segments are determined based on how management evaluates, measures and makes decisions with respect to the operations of the entity. The management of TECO Energy reports segments based on each subsidiary’s contribution of revenues, net income and total assets as required by the accounting guidance for disclosures about segments of an enterprise and related information. Intercompany transactions are eliminated in the Consolidated Condensed Financial Statements of TECO Energy, but are included in determining reportable segments. Three months ended Mar. 31, Tampa Electric PGS NMGC (2) TECO Coal (1) Other (2) (3) Eliminations (3) TECO Energy 2016 Revenues - external $ 423.4 $ 126.8 $ 106.6 $ 0.0 $ 2.7 $ 0.0 $ 659.5 Sales to affiliates 1.1 4.4 0.0 0.0 0.0 (5.5 ) 0.0 Total revenues 424.5 131.2 106.6 0.0 2.7 (5.5 ) 659.5 Depreciation and amortization 66.1 14.8 8.4 0.0 0.5 0.0 89.8 Total interest charges 23.8 3.7 3.0 0.0 15.6 (0.2 ) 45.9 Internally allocated interest 0.0 0.0 0.0 0.0 0.2 (0.2 ) 0.0 Provision (benefit) for income taxes 27.8 8.9 9.7 0.0 (10.7 ) 0.0 35.7 Net income (loss) from continuing operations 50.2 13.1 15.2 0.0 (4.8 ) 0.0 73.7 Income (loss) from discontinued operations, net (1) 0.0 0.0 0.0 0.0 0.1 0.0 0.1 Net income (loss) $ 50.2 $ 13.1 $ 15.2 $ 0.0 $ (4.7 ) $ 0.0 $ 73.8 2015 Revenues - external $ 449.8 $ 121.7 $ 119.0 $ 0.0 $ 2.5 $ 0.0 $ 693.0 Sales to affiliates 0.8 1.2 0.0 0.0 0.0 (2.0 ) 0.0 Total revenues 450.6 122.9 119.0 0.0 2.5 (2.0 ) 693.0 Depreciation and amortization 62.9 13.9 8.4 0.0 0.3 0.0 85.5 Total interest charges 23.5 3.5 3.3 0.0 17.9 (0.3 ) 47.9 Internally allocated interest 0.0 0.0 0.0 0.0 0.3 (0.3 ) 0.0 Provision (benefit) for income taxes 27.4 9.2 9.0 0.0 (5.7 ) 0.0 39.9 Net income (loss) from continuing operations 48.2 14.6 13.9 0.0 (12.9 ) 0.0 63.8 Income (loss) from discontinued operations, net (1) 0.0 0.0 0.0 (6.0 ) 0.2 0.0 (5.8 ) Net income (loss) $ 48.2 $ 14.6 $ 13.9 $ (6.0 ) $ (12.7 ) $ 0.0 $ 58.0 At Mar. 31, 2016 Total assets $ 6,988.2 $ 1,147.0 $ 1,210.9 $ 0.0 $ 1,982.1 $ (2,347.1 ) (4) $ 8,981.1 At Dec. 31, 2015 Total assets (3) $ 7,003.8 $ 1,136.1 $ 1,229.7 $ 0.0 $ 1,945.1 $ (2,381.2 ) (4) 8,933.5 (1) All periods have been adjusted to reflect the results from operations to discontinued operations for TECO Coal and certain charges and gains at Other, including Parent and TECO Diversified, that directly relate to TECO Coal and TECO Guatemala. See Note 15 (2) NMGI is included in the Other segment. (3) Certain prior year amounts have been reclassified to conform to current year presentation. (4) Amounts primarily relate to intercompany advances and consolidated tax eliminations.
Tampa Electric Company [Member]
Schedule of Segment Information	(millions) Tampa Tampa Electric Three months ended Mar. 31, Electric PGS Eliminations Company 2016 Revenues - external $ 424.2 $ 126.8 $ 0.0 $ 551.0 Intracompany sales 0.3 4.4 (4.7 ) 0.0 Total revenues 424.5 131.2 (4.7 ) 551.0 Depreciation and amortization 66.1 14.8 0.0 80.9 Total interest charges 23.8 3.7 0.0 27.5 Provision for income taxes 27.8 8.9 0.0 36.7 Net income $ 50.2 $ 13.1 $ 0.0 $ 63.3 2015 Revenues - external $ 450.4 $ 121.7 $ 0.0 $ 572.1 Intracompany sales 0.2 1.2 (1.4 ) 0.0 Total revenues 450.6 122.9 (1.4 ) 572.1 Depreciation and amortization 62.9 13.9 0.0 76.8 Total interest charges 23.5 3.5 0.0 27.0 Provision for income taxes 27.4 9.2 0.0 36.6 Net income $ 48.2 $ 14.6 $ 0.0 $ 62.8 Total assets at Mar. 31, 2016 $ 6,600.4 $ 1,109.6 $ (5.2 ) $ 7,704.8 Total assets at Dec. 31, 2015 (1) 6,620.2 1,097.7 (9.3 ) 7,708.6 (1) Certain prior year amounts have been reclassified to conform to current year presentation.

Accounting for Derivative Ins32

Accounting for Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2016
Derivative Volumes Expected to Settle	The maximum length of time over which the company is hedging its exposure to the variability in future cash flows extends to Feb. 28, 2018 for financial natural gas contracts. The following table presents the company’s derivative volumes that, as of Mar. 31, 2016, are expected to settle during the 2016, 2017 and 2018 fiscal years: Derivative Volumes Natural Gas Contracts (millions) (MMBTUs) Year Physical Financial 2016 0.0 25.1 2017 0.0 9.9 2018 0.0 0.7 Total 0.0 35.7
Tampa Electric Company [Member]
Derivative Volumes Expected to Settle	The maximum length of time over which TEC is hedging its exposure to the variability in future cash flows extends to Feb. 28, 2018 for financial natural gas contracts. The following table presents TEC’s derivative volumes that, as of Mar. 31, 2016, are expected to settle during the 2016, 2017 and 2018 fiscal years: Natural Gas Contracts (millions) (MMBTUs) Year Physical Financial 2016 0.0 25.1 2017 0.0 9.9 2018 0.0 0.7 Total 0.0 35.7

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
Schedule of Recurring Fair Value Measurements	Recurring Fair Value Measures As of Mar. 31, 2016 (millions) Level 1 Level 2 Level 3 Total Liabilities Natural gas derivatives $ 0.0 $ 23.1 $ 0.0 $ 23.1 As of Dec. 31, 2015 (millions) Level 1 Level 2 Level 3 Total Assets Natural gas derivatives $ 0.0 $ 0.2 $ 0.0 $ 0.2 Liabilities Natural gas derivatives $ 0.0 $ 26.2 $ 0.0 $ 26.2
Tampa Electric Company [Member]
Schedule of Recurring Fair Value Measurements	Recurring Derivative Fair Value Measures As of Mar. 31, 2016 (millions) Level 1 Level 2 Level 3 Total Liabilities Natural gas swaps $ 0.0 $ 23.0 $ 0.0 $ 23.0 As of Dec. 31, 2015 (millions) Level 1 Level 2 Level 3 Total Liabilities Natural gas swaps $ 0.0 $ 26.2 $ 0.0 $ 26.2

Discontinued Operations and A34

Discontinued Operations and Asset Impairments (Tables)	3 Months Ended
	Mar. 31, 2016
TECO Coal and TECO Guatemala [Member]
Components of Discontinued Operations	The following table provides selected components of discontinued operations related to the sales of TECO Coal and TECO Guatemala: Components of income from discontinued operations Three months ended Mar. 31, (millions) 2016 2015 Revenues—TECO Coal $ 0.0 $ 72.7 Loss from operations—TECO Coal 0.0 (9.5 ) Loss from operations—TECO Guatemala 0.0 (0.1 ) Income (loss) from discontinued operations—TECO Coal 0.2 (9.5 ) Loss from discontinued operations—TECO Guatemala 0.0 (0.1 ) Income (loss) from discontinued operations 0.2 (9.6 ) Provision (benefit) for income taxes 0.1 (3.8 ) Income (loss) from discontinued operations, net $ 0.1 $ (5.8 )

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Unbilled revenues	$ 67.3		$ 81.1
Franchise fees and gross receipts taxes	27.9	$ 27.4
Tampa Electric Company [Member]
Summary Of Significant Accounting Policies [Line Items]
Unbilled revenues	56.8		$ 53.7
Franchise fees and gross receipts taxes	$ 27.9	$ 27.4

New Accounting Pronouncements -

New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions	Jan. 01, 2016	Mar. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative adjustment to retained earnings	$ 2.6
Long-term Debt, Less Amount Due Within One Year [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Debt issuance cost		$ 26.4	$ 27.7
Long-term Debt, Less Amount Due Within One Year [Member] | Tampa Electric Company [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Debt issuance cost		$ 17.9	$ 18.1

Regulatory - Schedule of Regula

Regulatory - Schedule of Regulatory Assets and Regulatory Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Regulatory assets:
Regulatory assets	$ 433.6	$ 440
Less: Current portion	40.2	44.8
Long-term regulatory assets	393.4	395.2
Regulatory liabilities:
Regulatory liabilities	817.8	800.6
Less: Current portion	108.4	84.8
Long-term regulatory liabilities	709.4	715.8
Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	413	418.1
Less: Current portion	39.9	44.3
Long-term regulatory assets	373.1	373.8
Regulatory liabilities:
Regulatory liabilities	700	686.7
Less: Current portion	104.5	83.2
Long-term regulatory liabilities	595.5	603.5
Regulatory Tax Asset [Member]
Regulatory assets:
Regulatory assets	77.1	74.7
Regulatory Tax Asset [Member] | Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	77	74.6
Cost-Recovery Clauses - Deferred Balances [Member]
Regulatory assets:
Regulatory assets	0.1	5.5
Cost-Recovery Clauses - Deferred Balances [Member] | Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	0	5.2
Cost-Recovery Clauses - Offsets to Derivative Liabilities [Member]
Regulatory assets:
Regulatory assets	26	26.5
Cost-Recovery Clauses - Offsets to Derivative Liabilities [Member] | Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	25.9	26.2
Environmental Remediation [Member]
Regulatory assets:
Regulatory assets	54.4	54
Environmental Remediation [Member] | Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	54.4	54
Postretirement Benefit Costs [Member]
Regulatory assets:
Regulatory assets	238.5	240.6
Postretirement Benefit Costs [Member] | Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	236.4	238.3
Deferred Bond Refinancing Costs [Member]
Regulatory assets:
Regulatory assets	6.2	6.5
Deferred Bond Refinancing Costs [Member] | Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	6.2	6.5
Debt Basis Adjustment [Member]
Regulatory assets:
Regulatory assets	16.7	17.5
Competitive Rate Adjustment [Member]
Regulatory assets:
Regulatory assets	2.5	2.6
Competitive Rate Adjustment [Member] | Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	2.5	2.6
Other [Member]
Regulatory assets:
Regulatory assets	12.1	12.1
Other [Member] | Tampa Electric Company [Member]
Regulatory assets:
Regulatory assets	10.6	10.7
Regulatory Tax Liability [Member]
Regulatory liabilities:
Regulatory liabilities	7.6	7.9
Regulatory Tax Liability [Member] | Tampa Electric Company [Member]
Regulatory liabilities:
Regulatory liabilities	5.6	5.7
Cost-Recovery Clauses [Member]
Regulatory liabilities:
Regulatory liabilities	80	55.9
Cost-Recovery Clauses [Member] | Tampa Electric Company [Member]
Regulatory liabilities:
Regulatory liabilities	76.1	54.2
Transmission and Delivery Storm Reserve [Member]
Regulatory liabilities:
Regulatory liabilities	56.1	56.1
Transmission and Delivery Storm Reserve [Member] | Tampa Electric Company [Member]
Regulatory liabilities:
Regulatory liabilities	56.1	56.1
Accumulated Reserve - Cost of Removal [Member]
Regulatory liabilities:
Regulatory liabilities	673.6	679.9
Accumulated Reserve - Cost of Removal [Member] | Tampa Electric Company [Member]
Regulatory liabilities:
Regulatory liabilities	561.7	570
Other [Member]
Regulatory liabilities:
Regulatory liabilities	0.5	0.8
Other [Member] | Tampa Electric Company [Member]
Regulatory liabilities:
Regulatory liabilities	$ 0.5	$ 0.7

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Taxes [Line Items]
Effective tax rate	32.63%	38.48%
Income tax examination period	1 year
Tampa Electric Company [Member]
Income Taxes [Line Items]
Statutes of limitations	3 years
Income tax examination period	1 year
Minimum [Member]
Income Taxes [Line Items]
Statutes of limitations	3 years
Maximum [Member]
Income Taxes [Line Items]
Statutes of limitations	4 years

Employee Postretirement Benef39

Employee Postretirement Benefits - Schedule of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4.4	$ 4.5
Interest cost	8.1	7.4
Expected return on assets	(11.3)	(10.8)
Amortization of:
Prior service (benefit) cost	0	(0.1)
Actuarial loss	3.4	3.4
Regulatory asset	0	0
Net pension expense recognized in the TECO Energy Consolidated Condensed Statements of Income	4.6	4.4
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.5	0.6
Interest cost	2.2	2
Expected return on assets	(0.3)	(0.3)
Amortization of:
Prior service (benefit) cost	(0.6)	(0.6)
Actuarial loss	0	0
Regulatory asset	0.2	0.3
Net pension expense recognized in the TECO Energy Consolidated Condensed Statements of Income	$ 2	$ 2

Employee Postretirement Benef40

Employee Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	Jan. 01, 2016	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Reclassification of AOCI to net income as part of periodic benefit expense		$ 0.8	$ 0.8
Reclassification of regulatory assets to net income as part of periodic benefit expense		$ 2.2	2.2
Tampa Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term EROA		7.00%
Reclassification of regulatory assets to net income as part of periodic benefit expense		$ 2	1.9
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term EROA		7.00%
Discount rate		4.685%
Employer contributions		$ 4.7	14.9
Net pension expense		$ 4.6	4.4
Pension Benefits [Member] | Tampa Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		4.685%
Employer contributions		$ 3.9	11
Net pension expense		2.9	2.6
Other Postretirement Benefits Florida-Based Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.667%
Other Postretirement Benefits, NMGC Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.687%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net pension expense		2	2
Other Postretirement Benefits [Member] | Tampa Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.667%
Net pension expense		$ 1.5	$ 1.4

Short-Term Debt - Credit Facili

Short-Term Debt - Credit Facilities (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Line Of Credit Facility [Line Items]
Credit Facilities	$ 1,300,000,000	$ 900,000,000
Borrowings Outstanding	513,000,000	247,000,000
Letters of Credit Outstanding	2,200,000	2,200,000
Tampa Electric Company [Member]
Line Of Credit Facility [Line Items]
Credit Facilities	475,000,000	475,000,000
Borrowings Outstanding	0	61,000,000
Letters of Credit Outstanding	500,000	500,000
Tampa Electric Company [Member] | 5-year Facility [Member]
Line Of Credit Facility [Line Items]
Credit Facilities	325,000,000	325,000,000
Borrowings Outstanding	0	0
Letters of Credit Outstanding	500,000	500,000
Tampa Electric Company [Member] | 3-year Accounts Receivable Facility [Member]
Line Of Credit Facility [Line Items]
Credit Facilities	150,000,000	150,000,000
Borrowings Outstanding	0	61,000,000
Letters of Credit Outstanding	0	0
TECO Energy [Member] | 5-year Facility [Member]
Line Of Credit Facility [Line Items]
Credit Facilities	300,000,000	300,000,000
Borrowings Outstanding	113,000,000	163,000,000
Letters of Credit Outstanding	0	0
TECO Energy [Member] | 1-year Term Facility [Member]
Line Of Credit Facility [Line Items]
Credit Facilities	400,000,000	0
Borrowings Outstanding	400,000,000	0
Letters of Credit Outstanding	0	0
New Mexico Gas Company [Member] | 5-year Facility [Member]
Line Of Credit Facility [Line Items]
Credit Facilities	125,000,000	125,000,000
Borrowings Outstanding	0	23,000,000
Letters of Credit Outstanding	$ 1,700,000	$ 1,700,000

Short-Term Debt - Credit Faci42

Short-Term Debt - Credit Facilities (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Tampa Electric Company [Member] | 5-year Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility maturity date	Dec. 17, 2018	Dec. 17, 2018
Tampa Electric Company [Member] | 3-year Accounts Receivable Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility maturity date	Mar. 23, 2018	Mar. 23, 2018
TECO Energy [Member] | 5-year Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility maturity date	Dec. 17, 2018	Dec. 17, 2018
TECO Energy [Member] | 1-year Term Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility maturity date	Mar. 14, 2017	Mar. 14, 2017
New Mexico Gas Company [Member] | 5-year Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility maturity date	Dec. 17, 2018	Dec. 17, 2018

Short-Term Debt - Additional In

Short-Term Debt - Additional Information (Detail) - USD ($)	Mar. 14, 2016	Mar. 31, 2016	Dec. 31, 2015
Line Of Credit Facility [Line Items]
Line of Credit Facility maximum borrowing capacity		$ 1,300,000,000	$ 900,000,000
Tampa Electric Company [Member]
Line Of Credit Facility [Line Items]
Weighted-average interest rate		1.00%	0.89%
Line of Credit Facility maximum borrowing capacity		$ 475,000,000	$ 475,000,000
TECO Energy [Member]
Line Of Credit Facility [Line Items]
Weighted-average interest rate		1.44%	1.29%
TECO Finance [Member]
Line Of Credit Facility [Line Items]
Weighted-average interest rate		1.44%	1.29%
Basis spread on federal funds rate	0.50%
Interest rate description		provides for interest to accrue at variable rates based on the London interbank deposit rate plus a margin, or, as an alternative to such interest rate, at an interest rate equal to a margin plus the higher of JPMorgan Chase Bank’s prime rate, the federal funds rate plus 50 basis points, or the one-month London interbank deposit rate plus 1.00%.
TECO Finance [Member] | 1-year Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility maximum borrowing capacity	$ 400,000,000
Credit facility maturity date	Mar. 14, 2017
New Mexico Gas Company [Member]
Line Of Credit Facility [Line Items]
Weighted-average interest rate		1.44%	1.29%
Minimum [Member] | Tampa Electric Company [Member]
Line Of Credit Facility [Line Items]
Commitment fees, percentage		0.125%
Maximum [Member] | Tampa Electric Company [Member]
Line Of Credit Facility [Line Items]
Commitment fees, percentage		0.30%

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	Mar. 15, 2016	Mar. 15, 2012	Mar. 19, 2008	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, carrying amount				$ 3,573		$ 3,822.5
Estimated fair value				3,879.1		4,061.6
Purchase in lieu of redemption				250	$ 0
HCIDA Pollution Control Revenue Refunding Bonds [Member] | Held Bonds [Member]
Debt Instrument [Line Items]
Purchase in lieu of redemption				232.6
Tampa Electric Company [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount				2,245.3		2,245
Estimated fair value				$ 2,483.1		$ 2,433.3
Tampa Electric Company [Member] | HCIDA Pollution Control Revenue Refunding Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, repurchase date	Mar. 15, 2016	Mar. 15, 2012	Mar. 19, 2008
Purchase in lieu of redemption			$ 86
Stated interest rate	2.00%	1.875%	5.00%

Other Comprehensive Income - Ac

Other Comprehensive Income - Accumulated Other Comprehensive Loss (Income) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Other Comprehensive Income Loss [Line Items]
Unrealized gain on cash flow hedges, Gross		$ 0	$ 0.3
Reclassification from AOCI to net income, Gross	[1]	0.3	0.4
Gain on cash flow hedges, Gross		0.3	0.7
Amortization of unrecognized benefit costs, Gross	[2]	0.8	0.9
Total other comprehensive income (loss), Gross		1.1	1.6
Unrealized gain on cash flow hedges, Tax		0	(0.2)
Reclassification from AOCI to net income, Tax	[1]	(0.1)	(0.2)
Gain on cash flow hedges, Tax		(0.1)	(0.4)
Amortization of unrecognized benefit costs, Tax	[2]	(0.3)	(0.3)
Total other comprehensive income (loss), Tax		(0.4)	(0.7)
Unrealized gain on cash flow hedges, Net		0	0.1
Reclassification from AOCI to net income, Net	[1]	0.2	0.2
Gain on cash flow hedges, Net		0.2	0.3
Amortization of unrecognized benefit costs, Net	[2]	0.5	0.6
Other comprehensive income, net of tax		0.7	0.9
Unamortized pension loss and prior service credit	[3]	(33.6)		$ (34.2)
Unamortized other benefit gains, prior service costs and transition obligations	[4]	25.5		25.6
Net unrealized losses from cash flow hedges	[5]	(3.4)		(3.6)
Total accumulated other comprehensive loss		(11.5)		(12.2)
Tampa Electric Company [Member]
Other Comprehensive Income Loss [Line Items]
Unrealized gain on cash flow hedges, Gross		0	0.3
Reclassification from AOCI to net income, Gross		0.3	0.4
Gain on cash flow hedges, Gross		0.3	0.7
Total other comprehensive income (loss), Gross		0.3	0.7
Unrealized gain on cash flow hedges, Tax		0	(0.2)
Reclassification from AOCI to net income, Tax		(0.1)	(0.2)
Gain on cash flow hedges, Tax		(0.1)	(0.4)
Total other comprehensive income (loss), Tax		(0.1)	(0.4)
Unrealized gain on cash flow hedges, Net		0	0.1
Reclassification from AOCI to net income, Net		0.2	0.2
Gain on cash flow hedges, Net		0.2	0.3
Other comprehensive income, net of tax		0.2	$ 0.3
Net unrealized losses from cash flow hedges	[5]	(3.4)		(3.6)
Total accumulated other comprehensive loss		$ (3.4)		$ (3.6)
[1]	Related to interest rate contracts recognized in Interest expense.
[2]	Related to postretirement and postemployment benefits. See Note 5 for additional information.
[3]	Net of tax benefit of $21.1 million and $21.5 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively.
[4]	Net of tax expense of $16.0 million and $16.1 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively.
[5]	Net of tax benefit of $2.1 million and $2.3 million as of Mar. 31, 2016 and Dec. 31, 2015, respectively.

Other Comprehensive Income - 46

Other Comprehensive Income - Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized losses from cash flow hedges, tax benefit	$ 2.1	$ 2.3
Tampa Electric Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized losses from cash flow hedges, tax benefit	2.1	2.3
Pension Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Unamortized pension and other benefit loss, prior service cost (credit) and transition obligation, tax expense (benefit)	21.1	21.5
Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Unamortized pension and other benefit loss, prior service cost (credit) and transition obligation, tax expense (benefit)	$ 16	$ 16.1

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic earnings per share
Net income from continuing operations	$ 73.7	$ 63.8
Amount allocated to nonvested participating shareholders	(0.1)	(0.2)
Income before discontinued operations available to common shareholders - Basic	73.6	63.6
Income (loss) from discontinued operations, net	0.1	(5.8)
Amount allocated to nonvested participating shareholders	0	0
Income (loss) from discontinued operations available to common shareholders - Basic	0.1	(5.8)
Net income	73.8	58
Amount allocated to nonvested participating shareholders	(0.1)	(0.2)
Net income available to common shareholders - Basic	$ 73.7	$ 57.8
Average common shares outstanding - Basic	234	232.8
Earnings per share from continuing operations available to common shareholders - Basic	$ 0.31	$ 0.27
Earnings per share from discontinued operations available to common shareholders - Basic	0	(0.02)
Earnings per share - Basic	$ 0.31	$ 0.25
Diluted earnings per share
Net income from continuing operations	$ 73.7	$ 63.8
Amount allocated to nonvested participating shareholders	(0.1)	(0.2)
Income before discontinued operations available to common shareholders - Diluted	73.6	63.6
Income (loss) from discontinued operations, net	0.1	(5.8)
Amount allocated to nonvested participating shareholders	0	0
Income (loss) from discontinued operations available to common shareholders - Diluted	0.1	(5.8)
Net income	73.8	58
Amount allocated to nonvested participating shareholders	(0.1)	(0.2)
Net income available to common shareholders - Diluted	$ 73.7	$ 57.8
Average common shares outstanding - Basic	234	232.8
Assumed conversion of stock options, unvested restricted stock, unvested RSUs and contingent performance shares, net	1.2	0.7
Average common shares outstanding - Diluted	235.2	233.5
Earnings per share from continuing operations available to common shareholders - Diluted	$ 0.31	$ 0.27
Earnings per share from discontinued operations available to common shareholders - Diluted	0	(0.02)
Earnings per share - Diluted	$ 0.31	$ 0.25
Anti-dilutive shares	0.2	0.1

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Apr. 18, 2016USD ($)	Apr. 05, 2016USD ($)	Dec. 19, 2013USD ($)	Feb. 08, 2011CustomerInsuranceCarrierLawsuit	Mar. 31, 2016USD ($)Claims	Sep. 30, 2015USD ($)	Mar. 31, 2011Customer
Long Term Commitments [Line Items]
Gas supply disruption of high utility customers | Customer				28,700			32,000
Number of class actions settled | Claims					2
Number of insurance carriers | InsuranceCarrier				18
Number of lawsuits for insurance carriers | Lawsuit				2
Letters of indemnity coal mining permits						$ 93.8
PGS [Member]
Long Term Commitments [Line Items]
Total potential penalties					$ 3.9
Settlement agreement date					Apr. 18, 2016
Ultimate financial liability to superfund sites and former MGP sites					$ 33.9
PGS [Member] | Tampa Electric Company [Member]
Long Term Commitments [Line Items]
Total potential penalties					$ 3.9
Settlement agreement date					Apr. 18, 2016
Ultimate financial liability to superfund sites and former MGP sites					$ 33.9
FPSC [Member]
Long Term Commitments [Line Items]
Settlement agreement date					May 5, 2016
FPSC [Member] | Tampa Electric Company [Member]
Long Term Commitments [Line Items]
Settlement agreement date					May 5, 2016
Subsequent Event [Member]
Long Term Commitments [Line Items]
Dismissed annulment of the award		$ 21.1
Subsequent Event [Member] | PGS [Member]
Long Term Commitments [Line Items]
Civil penalty amount	$ 1
Customer refunds	2
Subsequent Event [Member] | PGS [Member] | Tampa Electric Company [Member]
Long Term Commitments [Line Items]
Civil penalty amount	1
Customer refunds	$ 2
TECO Guatemala Holdings, LLC v. The Republic of Guatemala [Member]
Long Term Commitments [Line Items]
Litigation settlement amount			$ 7.5
Damages awarded			$ 21.1
TECO Guatemala Holdings, LLC v. The Republic of Guatemala [Member] | U.S. prime rate plus [Member]
Long Term Commitments [Line Items]
Litigation settlement interest			2.00%

Commitments and Contingencies49

Commitments and Contingencies - Letters of Credit and Guarantees (Detail)	Mar. 31, 2016USD ($)
Guarantee Obligations [Line Items]
Year of expiration 2016	$ 89,400,000
Year of expiration 2017-2020	0
Year of expiration After 2020	92,900,000
Maximum Theoretical Obligation	182,300,000
Liabilities Recognized at Mar 31, 2016	0
Letter of Credit [Member]
Guarantee Obligations [Line Items]
Year of expiration 2016	0
Year of expiration 2017-2020	0
Year of expiration After 2020	2,200,000
Maximum Theoretical Obligation	2,200,000
Liabilities Recognized at Mar 31, 2016	100,000
Tampa Electric Company [Member] | Letters Of Credit [Member]
Guarantee Obligations [Line Items]
Year of expiration 2016	0
Year of expiration 2017-2020	0
Year of expiration After 2020	500,000
Maximum Theoretical Obligation	500,000
Liabilities Recognized at Mar 31, 2016	100,000
New Mexico Gas Company [Member] | Letters Of Credit [Member]
Guarantee Obligations [Line Items]
Year of expiration 2016	0
Year of expiration 2017-2020	0
Year of expiration After 2020	1,700,000
Maximum Theoretical Obligation	1,700,000
Liabilities Recognized at Mar 31, 2016	0
Fuel Sales and Transportation [Member]
Guarantee Obligations [Line Items]
Year of expiration 2016	0
Year of expiration 2017-2020	0
Year of expiration After 2020	92,900,000
Maximum Theoretical Obligation	92,900,000
Liabilities Recognized at Mar 31, 2016	0
Letters of Indemnity - Coal Mining Permits
Guarantee Obligations [Line Items]
Year of expiration 2016	89,400,000
Year of expiration 2017-2020	0
Year of expiration After 2020	0
Maximum Theoretical Obligation	89,400,000
Liabilities Recognized at Mar 31, 2016	$ 0

Segment Information - Schedule

Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 659.5	$ 693
Depreciation and amortization	89.8	85.5
Total interest charges	45.9	47.9
Internally allocated interest	0	0
Provision (benefit) for income taxes	35.7	39.9
Net income (loss) from continuing operations	73.7	63.8
Income (loss) from discontinued operations, net	0.1	(5.8)
Net income	73.8	58
Total assets	8,981.1		$ 8,933.5
Tampa Electric Company [Member]
Segment Reporting Information [Line Items]
Total revenues	551	572.1
Depreciation and amortization	80.9	76.8
Total interest charges	27.5	27
Provision (benefit) for income taxes	36.7	36.6
Net income	63.3	62.8
Total assets	7,704.8		7,708.6
Tampa Electric Company [Member] | Intracompany Sales [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	0	0
Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	(5.5)	(2)
Depreciation and amortization	0	0
Total interest charges	(0.2)	(0.3)
Internally allocated interest	(0.2)	(0.3)
Provision (benefit) for income taxes	0	0
Net income (loss) from continuing operations	0	0
Income (loss) from discontinued operations, net	0	0
Net income	0	0
Total assets	(2,347.1)		(2,381.2)
Eliminations [Member] | Tampa Electric Company [Member]
Segment Reporting Information [Line Items]
Total revenues	(4.7)	(1.4)
Depreciation and amortization	0	0
Total interest charges	0	0
Provision (benefit) for income taxes	0	0
Net income	0	0
Total assets	(5.2)		(9.3)
Eliminations [Member] | Tampa Electric Company [Member] | Intracompany Sales [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	(4.7)	(1.4)
Tampa Electric [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	424.5	450.6
Depreciation and amortization	66.1	62.9
Total interest charges	23.8	23.5
Internally allocated interest	0	0
Provision (benefit) for income taxes	27.8	27.4
Net income (loss) from continuing operations	50.2	48.2
Income (loss) from discontinued operations, net	0	0
Net income	50.2	48.2
Total assets	6,988.2		7,003.8
Tampa Electric [Member] | Operating Segments [Member] | Tampa Electric Company [Member]
Segment Reporting Information [Line Items]
Total revenues	424.5	450.6
Depreciation and amortization	66.1	62.9
Total interest charges	23.8	23.5
Provision (benefit) for income taxes	27.8	27.4
Net income	50.2	48.2
Total assets	6,600.4		6,620.2
Tampa Electric [Member] | Operating Segments [Member] | Tampa Electric Company [Member] | Intracompany Sales [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	0.3	0.2
PGS [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	131.2	122.9
Depreciation and amortization	14.8	13.9
Total interest charges	3.7	3.5
Internally allocated interest	0	0
Provision (benefit) for income taxes	8.9	9.2
Net income (loss) from continuing operations	13.1	14.6
Income (loss) from discontinued operations, net	0	0
Net income	13.1	14.6
Total assets	1,147		1,136.1
PGS [Member] | Operating Segments [Member] | Tampa Electric Company [Member]
Segment Reporting Information [Line Items]
Total revenues	131.2	122.9
Depreciation and amortization	14.8	13.9
Total interest charges	3.7	3.5
Provision (benefit) for income taxes	8.9	9.2
Net income	13.1	14.6
Total assets	1,109.6		1,097.7
PGS [Member] | Operating Segments [Member] | Tampa Electric Company [Member] | Intracompany Sales [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	4.4	1.2
NMGC [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	106.6	119
Depreciation and amortization	8.4	8.4
Total interest charges	3	3.3
Internally allocated interest	0	0
Provision (benefit) for income taxes	9.7	9
Net income (loss) from continuing operations	15.2	13.9
Income (loss) from discontinued operations, net	0	0
Net income	15.2	13.9
Total assets	1,210.9		1,229.7
TECO Coal [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0
Depreciation and amortization	0	0
Total interest charges	0	0
Internally allocated interest	0	0
Provision (benefit) for income taxes	0	0
Net income (loss) from continuing operations	0	0
Income (loss) from discontinued operations, net	0	(6)
Net income	0	(6)
Total assets	0		0
Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	2.7	2.5
Depreciation and amortization	0.5	0.3
Total interest charges	15.6	17.9
Internally allocated interest	0.2	0.3
Provision (benefit) for income taxes	(10.7)	(5.7)
Net income (loss) from continuing operations	(4.8)	(12.9)
Income (loss) from discontinued operations, net	0.1	0.2
Net income	(4.7)	(12.7)
Total assets	1,982.1		$ 1,945.1
Revenues - External [Member]
Segment Reporting Information [Line Items]
Total revenues	659.5	693
Revenues - External [Member] | Tampa Electric Company [Member]
Segment Reporting Information [Line Items]
Total revenues	551	572.1
Revenues - External [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0
Revenues - External [Member] | Eliminations [Member] | Tampa Electric Company [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0
Revenues - External [Member] | Tampa Electric [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	423.4	449.8
Revenues - External [Member] | Tampa Electric [Member] | Operating Segments [Member] | Tampa Electric Company [Member]
Segment Reporting Information [Line Items]
Total revenues	424.2	450.4
Revenues - External [Member] | PGS [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	126.8	121.7
Revenues - External [Member] | PGS [Member] | Operating Segments [Member] | Tampa Electric Company [Member]
Segment Reporting Information [Line Items]
Total revenues	126.8	121.7
Revenues - External [Member] | NMGC [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	106.6	119
Revenues - External [Member] | TECO Coal [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0
Revenues - External [Member] | Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	2.7	2.5
Sales to Affiliates [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	0	0
Sales to Affiliates [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	(5.5)	(2)
Sales to Affiliates [Member] | Tampa Electric [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	1.1	0.8
Sales to Affiliates [Member] | PGS [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	4.4	1.2
Sales to Affiliates [Member] | NMGC [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	0	0
Sales to Affiliates [Member] | TECO Coal [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	0	0
Sales to Affiliates [Member] | Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales to affiliates/Intracompany sales	$ 0	$ 0

Accounting for Derivative Ins51

Accounting for Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative assets	$ 0	$ 200,000
Derivative liabilities	23,100,000	26,200,000
Cash collateral posted with or received from any counterparties	0	0
Net pretax gain (loss) expected to be reclassified from regulatory assets or liabilities, next 12 months	(22,300,000)
Tampa Electric Company [Member]
Derivative [Line Items]
Derivative assets	0	0
Derivative liabilities	23,000,000	26,200,000
Cash collateral posted with or received from any counterparties	0	$ 0
Net pretax gain (loss) expected to be reclassified from regulatory assets or liabilities, next 12 months	$ (22,200,000)
Natural Gas Contracts [Member]
Derivative [Line Items]
Maximum length of time hedging in future cash flow	Feb. 28, 2018
Natural Gas Contracts [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Maximum length of time hedging in future cash flow	Feb. 28, 2018

Accounting for Derivative Ins52

Accounting for Derivative Instruments and Hedging Activities - Derivative Volumes Expected to Settle (Detail) - Natural Gas Contracts [Member] MMBTU in Millions	Mar. 31, 2016MMBTU
Physical [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
Physical [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
Financial [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	35.7
Financial [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	35.7
2016 [Member] | Physical [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
2016 [Member] | Physical [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
2016 [Member] | Financial [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	25.1
2016 [Member] | Financial [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	25.1
2017 [Member] | Physical [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
2017 [Member] | Physical [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
2017 [Member] | Financial [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	9.9
2017 [Member] | Financial [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	9.9
2018 [Member] | Physical [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
2018 [Member] | Physical [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
2018 [Member] | Financial [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0.7
2018 [Member] | Financial [Member] | Tampa Electric Company [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0.7

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Recurring Fair Value Measurements (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	$ 23,100,000	$ 26,200,000
Natural gas derivatives assets	0	200,000
Tampa Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	23,000,000	26,200,000
Natural gas derivatives assets	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	0	0
Natural gas derivatives assets	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Tampa Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	0	0
Natural gas derivatives assets	0	0
Natural Gas Derivatives [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	23,100,000	26,200,000
Natural gas derivatives assets		200,000
Natural Gas Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Tampa Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	23,000,000	26,200,000
Natural Gas Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	0	0
Natural gas derivatives assets		0
Natural Gas Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Tampa Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	0	0
Natural Gas Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	23,100,000	26,200,000
Natural gas derivatives assets		200,000
Natural Gas Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Tampa Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	23,000,000	26,200,000
Natural Gas Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	0	0
Natural gas derivatives assets		0
Natural Gas Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Tampa Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Natural gas derivative liabilities	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	$ 0	$ 200,000
Derivative liabilities	23,100,000	26,200,000
Tampa Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	23,000,000	26,200,000
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Tampa Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	$ 0	$ 0

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)MW	Mar. 31, 2015USD ($)
Long Term Contract For Purchase Of Electric Power [Line Items]
Purchased power | $	$ 14.4	$ 17.1
Tampa Electric Company [Member]
Long Term Contract For Purchase Of Electric Power [Line Items]
Purchased power | $	14.4	17.1
Power Purchase Agreements [Member] | Variable Interest Entity Not Primary Beneficiary [Member]
Long Term Contract For Purchase Of Electric Power [Line Items]
Purchased power | $	12.6	5.4
Power Purchase Agreements [Member] | Variable Interest Entity Not Primary Beneficiary [Member] | Tampa Electric Company [Member]
Long Term Contract For Purchase Of Electric Power [Line Items]
Purchased power | $	$ 12.6	$ 5.4
Minimum [Member]
Long Term Contract For Purchase Of Electric Power [Line Items]
Multiple PPAs range | MW	117
Minimum [Member] | Tampa Electric Company [Member]
Long Term Contract For Purchase Of Electric Power [Line Items]
Multiple PPAs range | MW	117
Maximum [Member]
Long Term Contract For Purchase Of Electric Power [Line Items]
Multiple PPAs range | MW	250
Maximum [Member] | Tampa Electric Company [Member]
Long Term Contract For Purchase Of Electric Power [Line Items]
Multiple PPAs range | MW	250

Discontinued Operations and A56

Discontinued Operations and Asset Impairments - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 21, 2015
TECO Coal [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Contingent payments	$ 0	$ 60

Discontinued Operations and A57

Discontinued Operations and Asset Impairments - Components of Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations	$ 0.2	$ (9.6)
Provision (benefit) from income taxes	0.1	(3.8)
Income (loss) from discontinued operations, net	0.1	(5.8)
TECO Coal [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Revenues	0	72.7
Loss from operations	0	(9.5)
Income (loss) from discontinued operations	0.2	(9.5)
TECO Guatemala [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss from operations	0	(0.1)
Income (loss) from discontinued operations	0	(0.1)
TECO Coal and TECO Guatemala [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Provision (benefit) from income taxes	$ 0.1	$ (3.8)

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) - USD ($)	Sep. 04, 2015	Mar. 31, 2016
Business Acquisition [Line Items]
Business combination incremental transaction related costs		$ 100,000
Emera Inc. [Member]
Business Acquisition [Line Items]
Amount of cash offered for each acquiree common stock share outstanding	$ 27.55
Aggregate purchase price	$ 10,400,000,000
Senior secured notes	$ 3,900,000,000
Merger agreement termination extension regulatory approval period	6 months
Termination fee payable by acquirer	$ 326,900,000
Emera Inc. [Member] | Tampa Electric Company [Member]
Business Acquisition [Line Items]
Amount of cash offered for each acquiree common stock share outstanding	$ 27.55
Aggregate purchase price	$ 10,400,000,000
Senior secured notes	$ 3,900,000,000
Merger agreement termination extension regulatory approval period	6 months
Termination fee payable by acquirer	$ 326,900,000
Senior secured notes	$ 2,300,000,000