XML 90 R34.htm IDEA: XBRL DOCUMENT

Jointly-Owned Electric Utility Plant (Tables)

12 Months Ended

Dec. 31, 2019

Jointly Owned Electric Utility Plant [Line Items]

Components of Jointly-Owned Electric Utility Plants

Information relative to IPL’s and WPL’s ownership interest in these jointly-owned EGUs at December 31, 2019 was as follows (dollars in millions):



	Ownership			Electric				Accumulated Provision				Construction
	Interest %			Plant				for Depreciation				Work in Progress
IPL
Ottumwa Unit 1	48.0	%			$571.5				$180.8				$18.8
George Neal Unit 4	25.7	%		191.8				93.5				0.8
George Neal Unit 3	28.0	%		163.7				63.2				0.9
Louisa Unit 1	4.0	%		39.9				24.9				0.2
				966.9				362.4				20.7
WPL
Columbia Units 1-2	53.3	%		777.0				264.7				5.5
FWEC	42.6	%		120.2				43.6				—
West Riverside	91.8	%		—				—				647.5
				897.2				308.3				653.0
Alliant Energy					$1,864.1				$670.7				$673.7

Jointly Owned Electric Utility Plant [Line Items]

Components of Jointly-Owned Electric Utility Plants

Information relative to IPL’s and WPL’s ownership interest in these jointly-owned EGUs at December 31, 2019 was as follows (dollars in millions):



	Ownership			Electric				Accumulated Provision				Construction
	Interest %			Plant				for Depreciation				Work in Progress
IPL
Ottumwa Unit 1	48.0	%			$571.5				$180.8				$18.8
George Neal Unit 4	25.7	%		191.8				93.5				0.8
George Neal Unit 3	28.0	%		163.7				63.2				0.9
Louisa Unit 1	4.0	%		39.9				24.9				0.2
				966.9				362.4				20.7
WPL
Columbia Units 1-2	53.3	%		777.0				264.7				5.5
FWEC	42.6	%		120.2				43.6				—
West Riverside	91.8	%		—				—				647.5
				897.2				308.3				653.0
Alliant Energy					$1,864.1				$670.7				$673.7

Jointly Owned Electric Utility Plant [Line Items]

Components of Jointly-Owned Electric Utility Plants

Information relative to IPL’s and WPL’s ownership interest in these jointly-owned EGUs at December 31, 2019 was as follows (dollars in millions):



	Ownership			Electric				Accumulated Provision				Construction
	Interest %			Plant				for Depreciation				Work in Progress
IPL
Ottumwa Unit 1	48.0	%			$571.5				$180.8				$18.8
George Neal Unit 4	25.7	%		191.8				93.5				0.8
George Neal Unit 3	28.0	%		163.7				63.2				0.9
Louisa Unit 1	4.0	%		39.9				24.9				0.2
				966.9				362.4				20.7
WPL
Columbia Units 1-2	53.3	%		777.0				264.7				5.5
FWEC	42.6	%		120.2				43.6				—
West Riverside	91.8	%		—				—				647.5
				897.2				308.3				653.0
Alliant Energy					$1,864.1				$670.7				$673.7