Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2011

Regulatory Matters [Abstract]

Schedule Of Regulatory Assets And Liabilities

Duke Energy Registrants' Regulatory Assets and Liabilities:

As of December 31, 2011	Duke Energy		Duke  Energy Carolinas		Duke Energy Ohio		Duke Energy Indiana		Recovery/Refund Period Ends(k)
	(in millions)
Regulatory Assets(a)
Vacation accrual	$	150	$	70	$	7	$	13		2012
Under-recovery of fuel costs		38		—		10		28		2012
Hedge costs and other deferrals		4		3		1		—		2012
Post-in-service carrying costs and deferred operating expense(c)(l)		31		28		—		3		2012
Over-distribution of Bulk Power Marketing sharing		41		41		—		—		2012
Demand side management costs (DSM costs)/Energy Efficiency		43		25		—		18		2012
Regional Transmission Organization (RTO) costs(m)		17		5		—		12		2012
SmartGrid		9		—		9		—		2012
Gasification services agreement buyout costs		25		—		—		25		2012
Other		16		—		1		15		2012
Total Current Regulatory Assets(d)		374		172		28		114
Net regulatory asset related to income taxes(e)		892		668		77		147		(h	)
Accrued pension and post-retirement		1,726		734		212		314		(b	)
ARO costs		191		191		—		—		2043
Gasification services agreement buyout costs		88		—		—		88		2018
Deferred debt expense(e)		122		98		8		16		2041
Post-in-service carrying costs and deferred operating expense(c)(l)		119		31		16		72		(h	)
Under-recovery of fuel costs		13		13		—		—		2013
Hedge costs and other deferrals		166		91		8		67		(b	)
Storm cost deferrals		18		—		18		—		(b	)
Manufactured gas plant environmental costs		69		—		69		—		(b	)
Smart Grid		32		—		32		—		(b	)
Gallagher Units 1 & 3		73		—		—		73		(b	)
RTO costs(m)		80		13		74		—		(b	)
DSM costs/Energy Efficiency		38		38		—		—		(b	)
Other		45		17		6		21		(b	)
Total Non-Current Regulatory Assets		3,672		1,894		520		798
Total Regulatory Assets	$	4,046	$	2,066	$	548	$	912
Regulatory Liabilities(a)
Nuclear property and insurance reserves	$	2	$	2	$	—	$	—		2012
DSM costs(f)		41		41		—		—		2012
Gas purchase costs		20		—		20		—		2012
Over-recovery of fuel costs(f)		6		6		—		—		2012
Other		18		13		2		3		2012
Total Current Regulatory Liabilities(g)		87		62		22		3
Removal costs(e)		2,586		1,770		230		590		(j	)
Nuclear property and liability reserves		86		86		—		—		2043
DSM costs(f)/Energy Efficiency		27		10		17		—		(i	)
Accrued pension and other post-retirement benefits		117		—		19		70		(b	)
Commodity contract termination settlement		23		—		—		23		2014
Injuries and damages reserve(e)		38		38		—		—		(b	)
Hedge costs and other deferrals(e)		12		—		—		—		2016
Other		30		24		7		—		(b	)
Total Non-Current Regulatory Liabilities		2,919		1,928		273		683
Total Regulatory Liabilities	$	3,006	$	1,990	$	295	$	686

As of December 31, 2010	Duke Energy		Duke  Energy Carolinas		Duke Energy Ohio		Duke Energy Indiana		Recovery/Refund Period Ends(k)
	(in millions)
Regulatory Assets(a)
Vacation accrual	$	146	$	67	$	8	$	13		2011
Under-recovery of fuel costs		31		—		12		19		2011
Post-in-service carrying costs and deferred operating expense(c)(l)		28		28		—		—		2011
Over-distribution of Bulk Power Marketing sharing		35		35		—		—		2011
Other		15		6		—		9		2011
Total Current Regulatory Assets(d)		255		136		20		41
Net regulatory asset related to income taxes(e)		780		601		78		101		(h	)
Accrued pension and post-retirement		1,616		680		211		316		(b	)
ARO costs		133		133		—		—		2043
Regulatory transition charges (RTC)		3		—		3		—		2011
Gasification services agreement buyout costs		129		—		—		129		2018
Deferred debt expense(e)		138		108		9		21		2040
Post-in-service carrying costs and deferred operating expense(c)(l)		103		11		11		81		(h	)
Under-recovery of fuel costs		21		20		1		—		2012
Hedge costs and other deferrals		6		—		6		—		(b	)
Storm cost deferrals		33		—		21		12		(b	)
Manufactured gas plant environmental costs		60		—		60		—		(b	)
Smart Grid		28		—		28		—		(b	)
RTO costs(m)		7		—		7		—		(b	)
Other		78		23		5		50		(b	)
Total Non-Current Regulatory Assets		3,135		1,576		440		710
Total Regulatory Assets	$	3,390	$	1,712	$	460	$	751
Regulatory Liabilities(a)
Nuclear property and insurance reserves	$	52	$	52	$	—	$	—		2011
DSM costs(f)		38		38		—		—		(i	)
Gas purchase costs		25		—		25		—		2011
Over-recovery of fuel costs(f)		155		152		3		—		2011
Other		9		5		2		2		(b	)
Total Current Regulatory Liabilities(g)		279		247		30		2
Removal costs(e)		2,465		1,684		220		565		(j	)
Nuclear property and liability reserves		89		89		—		—		2043
DSM costs(f)		57		52		5		—		(i	)
Accrued pension and other post-retirement benefits		88		—		20		58		(b	)
Commodity contract termination settlement		28		—		—		28		2014
Injuries and damages reserve(e)		38		38		—		—		(b	)
Hedge costs and other deferrals(e)		75		60		1		—		2042
Other		36		17		19		—		(b	)
Total Non-Current Regulatory Liabilities		2,876		1,940		265		651
Total Regulatory Liabilities	$	3,155	$	2,187	$	295	$	653

(a) All regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b) Recovery/Refund period varies for these items with some currently unknown.

(c) Duke Energy Carolinas is allowed to earn a return on the North Carolina portion of the outstanding balance. Duke Energy Carolinas does not earn a return on the South Carolina portion during the refund period.

(d) Included in Other within Current Assets on the Consolidated Balance Sheets.

(e) Included in rate base.

(f) Duke Energy Carolinas is required to pay interest on the outstanding balance.

(g) Included in Other within Current Liabilities and on the Consolidated Balance Sheets.

(h) Recovery is over the life of the associated asset.

(i) Incurred costs were deferred and are being recovered in rates. Duke Energy Carolinas is currently over-recovered for these costs in the South Carolina jurisdiction. For 2011 and 2010, expected refund period is three years and two years, respectively, but is dependent on volume of sales.

(j) Liability is extinguished over the lives of the associated assets.

(k) Represents the latest recovery period across all jurisdictions in which the Duke Energy Registrants operate. Regulatory asset and liability balances may be collected or refunded sooner than the indicated date in certain jurisdictions.

(l) Duke Energy Carolinas amounts are excluded from rate base. Duke Energy Ohio amounts are included in rate base. At Duke Energy Indiana, some amounts are included and some are excluded from rate base.

(m) Duke Energy Carolinas RTO costs reflect those from GridSouth, while those from Duke Energy Ohio and Duke Energy Indiana are related to the Midwest Independent Transmission System Operator, Inc. (Midwest ISO).

Schedule Of Net Carrying Value Of Facilities As Well As The Remaining Non-current Regulatory Assets

	Duke Energy		Duke Energy Carolinas  (a)		Duke Energy Ohio  (b)(e)		Duke Energy Indiana  (c)
MW		3,329		1,356		1,025		948
Remaining net book value (in millions)(d)	$	353	$	199	$	14	$	140
Remaining non-current regulatory asset(f)	$	73	$	—	$	—	$	73

(a) Includes Dan River, Riverbend, Lee and Buck units 5 and 6. Duke Energy Carolinas has committed to retire 1,667 MW in conjunction with a Cliffside air permit settlement, of which 311 MW have already been retired as of December 31, 2011. Refer to Note 5.

(b) Includes Beckjord and Miami Fort unit 6.

(c) Includes Wabash River units 2-6 and Gallagher units 1 and 3.

(d) Included in Property, plant and equipment, net as of December 31, 2011, on the Consolidated Balance Sheets.

(e) Beckjord has no remaining net book value – Refer to Note 12.

(f) On February 1, 2012, 280 MW for Gallagher units 1 and 3 were retired by Duke Energy Indiana. In its December 28, 2011 order, the IURC allowed recovery of and return on the carrying value of the Gallagher units over the original life of these units and classification of this amount as a regulatory asset.