Jointly-Owned Electric Utility Plant (Tables)

12 Months Ended

Dec. 31, 2011

Jointly-Owned Electric Utility Plant [Abstract]

Components Of Jointly-Owned Electric Utility Plants


	In-service Dates	Fuel Type		Ownership Interest %			Plant in Service		Accumulated Provision for Depreciation		Construction Work in Progress		Cost of Removal Obligations Included in Regulatory Liabilities
IPL
Ottumwa Unit 1	1981		Coal		48.0	%	$	234.8	$	114.6	$	10.4	$	14.5
George Neal Unit 4	1979		Coal		25.7	%		96.7		65.6		6.1		11.1
George Neal Unit 3	1975		Coal		28.0	%		57.6		37.7		2.9		5.4
Louisa Unit 1	1983		Coal		4.0	%		35.0		18.7		0.1		2.9

								424.1		236.6		19.5		33.9

WPL
Columbia Units 1-2	1975-1978		Coal		46.2	%		242.9		152.3		12.5		10.0
Edgewater Unit 4	1969		Coal		68.2	%		88.3		46.3		0.6		2.5

								331.2		198.6		13.1		12.5

							$	755.3	$	435.2	$	32.6	$	46.4

- Definition

Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants.

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