Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2012

Regulatory Matters [Abstract]

Schedule of Regulatory Assets and Liabilities

	Duke Energy		Duke  Energy Carolinas(b)(c)(d)		Duke  Energy Ohio(e)		Duke  Energy Indiana(f)
MW		3,049		1,356		1,025		668
Remaining net book value (in millions)(a)	$	344	$	192	$	14	$	138

(a) Included in Property, plant and equipment, net, on the Condensed Consolidated Balance Sheets unless otherwise noted.

(b) Includes Dan River Units 1 through 3, Riverbend Units 4 through 7, Lee Units 1 through 3 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.

(c) Dan River was retired on April 1, 2012.

(d) Net book value of Buck Units 5 and 6 of $79 million is included in Generation facilities to be retired, net, on the Condensed Consolidated Balance Sheets.

(e) Includes Beckjord Station and Miami Fort Unit 6. Beckjord has no remaining book value.

(f) Includes Wabash River Units 2 through 6.