Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 24.4	$ 23.8
Receivables, less allowance for uncollectibles	268.2	280.7
Inventories, at average cost
Regulatory assets	21.8	44.8
Prepayments and other current assets	24.0	30.8
Total current assets	507.3	570.3
Property, plant and equipment
Construction work in progress	916.8	794.7
Other property	16.8	15.9
Property, plant and equipment, at original costs	10,624.1	10,194.7
Accumulated depreciation	(2,862.2)	(2,712.9)
Total property, plant and equipment, net	7,761.9	7,481.8
Other assets
Regulatory assets	458.7	395.2
Goodwill	408.4	408.4
Deferred charges and other assets	87.4	77.8
Total other assets	954.5	881.4
Total assets	9,223.7	8,933.5
Current liabilities
Long-term debt due within one year	0.0	333.3
Notes payable	610.5	247.0
Accounts payable	264.0	255.4
Customer deposits	160.6	182.1
Regulatory liabilities	148.2	84.8
Derivative liabilities	1.6	24.1
Interest accrued	53.1	36.2
Taxes accrued	65.0	13.2
Other	44.5	22.6
Total current liabilities	1,347.5	1,198.7
Other liabilities
Deferred income taxes	650.1	570.7
Investment tax credits	10.2	10.5
Regulatory liabilities	718.8	715.8
Deferred credits and other liabilities	412.6	389.6
Long-term debt, less amount due within one year	3,490.3	3,489.2
Total other liabilities	5,282.0	5,175.8
Commitments and contingencies
Capital
Common equity	0.0	235.3
Additional paid in capital	2,154.7	1,894.5
Retained earnings	457.1	441.4
Accumulated other comprehensive loss	(17.6)	(12.2)
Total capital	2,594.2	2,559.0
Long-term debt	3,490.3	3,489.2
Total liabilities and capital	9,223.7	8,933.5
Tampa Electric Company [Member]
Current assets
Cash and cash equivalents	15.4	9.1
Receivables, less allowance for uncollectibles	254.9	230.2
Inventories, at average cost
Taxes receivable from affiliate	0.0	61.3
Regulatory assets	20.6	44.3
Prepayments and other current assets	16.3	21.5
Total current assets	468.1	545.1
Property, plant and equipment
Construction work in progress	875.2	771.1
Utility plant in service, at original costs	9,815.4	9,440.0
Accumulated depreciation	(2,808.3)	(2,676.8)
Utility plant in service, net	7,007.1	6,763.2
Other property	10.5	9.7
Total property, plant and equipment, net	7,017.6	6,772.9
Other assets
Regulatory assets	438.2	373.8
Deferred charges and other assets	468.1	390.6
Other	29.9	16.8
Total assets	7,953.8	7,708.6
Current liabilities
Long-term debt due within one year	0.0	83.3
Notes payable	49.0	61.0
Accounts payable	222.0	221.6
Customer deposits	155.2	176.3
Regulatory liabilities	140.4	83.2
Derivative liabilities	1.4	24.1
Interest accrued	40.1	16.9
Taxes accrued	74.5	13.2
Other	10.3	10.2
Total current liabilities	692.9	689.8
Other liabilities
Deferred income taxes	1,388.2	1,308.8
Investment tax credits	10.2	10.5
Regulatory liabilities	597.0	603.5
Deferred credits and other liabilities	339.3	318.8
Long-term debt, less amount due within one year	2,162.6	2,161.7
Total deferred credits	2,334.7	2,241.6
Commitments and contingencies
Capital
Common equity	2,395.4	2,305.4
Retained earnings	371.2	313.7
Accumulated other comprehensive loss	(3.0)	(3.6)
Total capital	2,763.6	2,615.5
Long-term debt	2,162.6	2,161.7
Total capitalization	4,926.2	4,777.2
Total liabilities and capital	7,953.8	7,708.6
Fuel [Member]
Inventories, at average cost
Utility inventories	85.2	113.4
Fuel [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	80.7	105.6
Materials and Supplies [Member]
Inventories, at average cost
Utility inventories	83.7	76.8
Materials and Supplies [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	80.2	73.1
Electric [Member]
Property, plant and equipment
Utility plant in service, at original costs	7,473.9	7,270.3
Electric [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Utility plant in service, at original costs	7,473.9	7,270.3
Gas [Member]
Property, plant and equipment
Utility plant in service, at original costs	2,216.6	2,113.8
Gas [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Utility plant in service, at original costs	$ 1,466.3	$ 1,398.6