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Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2018

Regulatory assets were comprised of the following items (in millions):



	Alliant Energy				IPL				WPL
	September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017
Tax-related		$798.3		$778.2		$762.4		$750.5		$35.9		$27.7
Pension and OPEB costs	519.8		548.0		261.2		274.4		258.6		273.6
Asset retirement obligations	111.6		109.3		77.3		72.5		34.3		36.8
EGUs retired early	110.4		63.8		57.2		31.6		53.2		32.2
Derivatives	26.3		45.3		13.3		21.8		13.0		23.5
Emission allowances	24.3		25.5		24.3		25.5		—		—
Other	104.0		96.6		54.2		55.3		49.8		41.3
		$1,694.7		$1,666.7		$1,249.9		$1,231.6		$444.8		$435.1

Regulatory liabilities were comprised of the following items (in millions):



	Alliant Energy				IPL				WPL
	September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017
Tax-related		$891.1		$899.4		$389.9		$399.5		$501.2		$499.9
Cost of removal obligations	401.0		410.0		274.0		274.5		127.0		135.5
Electric transmission cost recovery	97.0		90.4		37.9		26.4		59.1		64.0
Commodity cost recovery	20.1		21.0		13.6		14.6		6.5		6.4
IPL’s tax benefit riders	13.0		25.0		13.0		25.0		—		—
Other	83.4		51.4		34.2		15.4		49.2		36.0
		$1,505.6		$1,497.2		$762.6		$755.4		$743.0		$741.8

Regulatory assets were comprised of the following items (in millions):



	Alliant Energy				IPL				WPL
	September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017
Tax-related		$798.3		$778.2		$762.4		$750.5		$35.9		$27.7
Pension and OPEB costs	519.8		548.0		261.2		274.4		258.6		273.6
Asset retirement obligations	111.6		109.3		77.3		72.5		34.3		36.8
EGUs retired early	110.4		63.8		57.2		31.6		53.2		32.2
Derivatives	26.3		45.3		13.3		21.8		13.0		23.5
Emission allowances	24.3		25.5		24.3		25.5		—		—
Other	104.0		96.6		54.2		55.3		49.8		41.3
		$1,694.7		$1,666.7		$1,249.9		$1,231.6		$444.8		$435.1

Regulatory liabilities were comprised of the following items (in millions):



	Alliant Energy				IPL				WPL
	September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017
Tax-related		$891.1		$899.4		$389.9		$399.5		$501.2		$499.9
Cost of removal obligations	401.0		410.0		274.0		274.5		127.0		135.5
Electric transmission cost recovery	97.0		90.4		37.9		26.4		59.1		64.0
Commodity cost recovery	20.1		21.0		13.6		14.6		6.5		6.4
IPL’s tax benefit riders	13.0		25.0		13.0		25.0		—		—
Other	83.4		51.4		34.2		15.4		49.2		36.0
		$1,505.6		$1,497.2		$762.6		$755.4		$743.0		$741.8

Regulatory assets were comprised of the following items (in millions):



	Alliant Energy				IPL				WPL
	September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017
Tax-related		$798.3		$778.2		$762.4		$750.5		$35.9		$27.7
Pension and OPEB costs	519.8		548.0		261.2		274.4		258.6		273.6
Asset retirement obligations	111.6		109.3		77.3		72.5		34.3		36.8
EGUs retired early	110.4		63.8		57.2		31.6		53.2		32.2
Derivatives	26.3		45.3		13.3		21.8		13.0		23.5
Emission allowances	24.3		25.5		24.3		25.5		—		—
Other	104.0		96.6		54.2		55.3		49.8		41.3
		$1,694.7		$1,666.7		$1,249.9		$1,231.6		$444.8		$435.1

Regulatory liabilities were comprised of the following items (in millions):



	Alliant Energy				IPL				WPL
	September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017
Tax-related		$891.1		$899.4		$389.9		$399.5		$501.2		$499.9
Cost of removal obligations	401.0		410.0		274.0		274.5		127.0		135.5
Electric transmission cost recovery	97.0		90.4		37.9		26.4		59.1		64.0
Commodity cost recovery	20.1		21.0		13.6		14.6		6.5		6.4
IPL’s tax benefit riders	13.0		25.0		13.0		25.0		—		—
Other	83.4		51.4		34.2		15.4		49.2		36.0
		$1,505.6		$1,497.2		$762.6		$755.4		$743.0		$741.8