Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 200.5	$ 44.0
Restricted cash	0	8.7
Receivables, less allowance for uncollectibles of $1.5 and $1.3 at Dec. 31, 2012 and 2011, respectively	282.7	327.7
Inventories, at average cost
Fuel	123.6	136.8
Materials and supplies	82.1	87.3
Derivative assets	0	0.9
Regulatory assets	70.3	87.3
Deferred income taxes	63.3	72.7
Prepayments and other current assets	33.9	31.9
Income tax receivables	0.4	0.6
Total current assets	856.8	797.9
Property, plant and equipment
Electric	6,655.8	6,731.7
Gas	1,228.3	1,169.9
Construction work in progress	336.1	247.4
Other property	443.8	432.3
Property, plant and equipment, at original costs	8,664.0	8,581.3
Accumulated depreciation	(2,673.9)	(2,613.5)
Total property, plant and equipment, net	5,990.1	5,967.8
Deferred debits
Regulatory assets	382.6	364.5
Derivative assets	0.2	0
Goodwill	0	55.4
Deferred charges and other assets	126.8	136.6
Total deferred debits	509.6	556.5
Total assets	7,356.5	7,322.2
Current liabilities
Recourse	0	374.9
Long-term debt due within one year	0	386.1
Non-recourse	0	11.2
Accounts payable	232.8	252.3
Customer deposits	162.9	159.5
Regulatory liabilities	106.7	86.2
Derivative liabilities	14.6	58.4
Interest accrued	33.2	39.3
Taxes accrued	32.1	20.7
Other	19.9	17.2
Total current liabilities	602.2	1,019.7
Deferred credits
Deferred income taxes	277.9	150.8
Investment tax credits	9.7	10.0
Regulatory liabilities	651.9	619.4
Derivative liabilities	0.6	8.6
Deferred credits and other liabilities	549.7	559.2
Long-term debt, less amount due within one year
Recourse	2,972.7	2,665.0
Non-recourse	0	22.3
Total other liabilities	4,462.5	4,035.3
Capital
Common equity (400.0 million shares authorized; par value $1; 216.6 million and 215.8 million shares outstanding at Dec. 31, 2012 and 2011, respectively)	216.6	215.8
Additional paid in capital	1,564.5	1,553.4
Retained earnings	541.7	519.4
Accumulated other comprehensive loss	(31.0)	(22.0)
TECO Energy capital	2,291.8	2,266.6
Noncontrolling interest	0	0.6
Long-term debt, less amount due within one year	2,972.7	2,687.3
Total capital	2,291.8	2,267.2
Total liabilities and capital	7,356.5	7,322.2
TAMPA ELECTRIC CO [Member]
Current assets
Cash and cash equivalents	45.2	13.9
Receivables, less allowance for uncollectibles of $1.5 and $1.3 at Dec. 31, 2012 and 2011, respectively	213.8	216.8
Inventories, at average cost
Fuel	89.1	97.9
Materials and supplies	72.4	67.7
Regulatory assets	70.3	87.3
Deferred income taxes	20.0	30.4
Prepayments and other current assets	11.5	10.5
Income tax receivables	22.1	14.6
Total current assets	544.4	539.1
Property, plant and equipment
Electric	6,654.5	6,516.0
Gas	1,171.9	1,113.5
Construction work in progress	335.0	239.2
Other property	7.3	6.5
Property, plant and equipment, at original costs	8,161.4	7,868.7
Accumulated depreciation	(2,352.0)	(2,230.3)
Public utilities, property, plant and equipment, net	5,809.4	5,638.4
Total property, plant and equipment, net	5,816.7	5,644.9
Deferred debits
Unamortized debt expense	16.1	14.1
Regulatory assets	382.6	364.5
Derivative assets	0.2	0
Other	6.2	8.8
Total deferred debits	405.1	387.4
Total assets	6,766.2	6,571.4
Current liabilities
Long-term debt due within one year	0	374.9
Accounts payable	188.6	191.3
Customer deposits	163.0	159.5
Regulatory liabilities	106.7	86.2
Derivative liabilities	14.1	58.4
Interest accrued	17.3	25.6
Taxes accrued	13.7	11.9
Other	11.8	11.6
Total current liabilities	515.2	919.4
Deferred credits
Deferred income taxes	980.9	833.0
Investment tax credits	9.7	10.0
Regulatory liabilities	651.9	619.4
Derivative liabilities	0.2	7.4
Other	409.4	412.4
Total deferred credits	2,052.1	1,882.2
Long-term debt, less amount due within one year
Commitments and Contingencies
Capital
Common equity (400.0 million shares authorized; par value $1; 216.6 million and 215.8 million shares outstanding at Dec. 31, 2012 and 2011, respectively)	1,970.4	1,852.4
Retained earnings	304.6	305.7
Accumulated other comprehensive loss	(8.7)	(4.6)
Total capital	2,266.3	2,153.5
Long-term debt, less amount due within one year	1,932.6	1,616.3
Total capital	4,198.9	3,769.8
Total liabilities and capital	$ 6,766.2	$ 6,571.4