Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Asset Retirement Obligations

Reconciliation of beginning and ending carrying amount of asset retirement obligations:
	Dec. 31,
(millions)	2012	2011
Beginning balance	$53.8	$55.7
Additional liabilities	0.7	0.8
Liabilities settled	(29.1)	(3.6)
Accretion expense	1.4	1.4
Revisions to estimated cash flows	0.0	(2.2)
Other (1)	1.8	1.7
Ending balance	$28.6	$53.8
(1)Accretion recorded as a deferred regulatory asset.

TAMPA ELECTRIC CO [Member]

Schedule of Asset Retirement Obligations

Reconciliation of beginning and ending carrying amount of asset retirement obligations:
	Dec. 31,
(millions)	2012			2011
Beginning balance	$	30.8		$	31.3
Liabilities settled		(27.6	)		0.0
Revisions to estimated cash flows		0.0			(2.2)
Other (1)		1.8			1.7
Ending balance	$	5.0		$	30.8
(1) Accretion recorded as a deferred regulatory asset.