Segments Of Business (Tables)

12 Months Ended

Dec. 31, 2015

Certain financial information relating to Alliant Energy’s business segments, services and geographic information was as follows (in millions):



	Utility										Non-Regulated,			Alliant Energy
2015	Electric			Gas		Other		Total			Parent and Other			Consolidated
Operating revenues		$2,770.5			$381.2		$57.9		$3,209.6			$44.0			$3,253.6
Depreciation and amortization	358.6			31.1		1.8		391.5			9.8			401.3
Operating income	514.1			34.6		1.9		550.6			26.4			577.0
Interest expense								189.2			(2.1		)	187.1
Equity (income) loss from unconsolidated investments, net	(35.1		)	—		—		(35.1		)	1.3			(33.8		)
Income taxes								60.2			10.2			70.4
Net income attributable to Alliant Energy common shareowners								362.3			15.9			378.2
Total assets	10,211.3			939.3		828.9		11,979.5			515.7			12,495.2
Investments in equity method subsidiaries	302.0			—		—		302.0			0.9			302.9
Construction and acquisition expenditures	855.8			106.4		1.4		963.6			70.7			1,034.3



	Utility										Non-Regulated,		Alliant Energy
2014	Electric			Gas		Other		Total			Parent and Other		Consolidated
Operating revenues		$2,713.6			$517.5		$66.1		$3,297.2			$53.1		$3,350.3
Depreciation and amortization	347.0			29.9		1.8		378.7			9.4		388.1
Operating income	442.4			53.8		14.0		510.2			33.4		543.6
Interest expense								176.3			4.3		180.6
Equity (income) loss from unconsolidated investments, net	(42.8		)	—		—		(42.8		)	2.4		(40.4		)
Income taxes								36.4			7.9		44.3
Net income attributable to Alliant Energy common shareowners								362.0			21.1		383.1
Total assets	9,660.4			913.5		993.9		11,567.8			495.7		12,063.5
Investments in equity method subsidiaries	294.3			—		—		294.3			2.3		296.6
Construction and acquisition expenditures	774.8			63.2		0.9		838.9			63.9		902.8



	Utility										Non-Regulated,		Alliant Energy
2013	Electric			Gas		Other		Total			Parent and Other		Consolidated
Operating revenues		$2,689.0			$464.8		$71.3		$3,225.1			$51.7		$3,276.8
Depreciation and amortization	333.0			28.8		1.5		363.3			7.6		370.9
Operating income	444.5			57.3		6.3		508.1			25.8		533.9
Interest expense								166.3			6.5		172.8
Equity income from unconsolidated investments, net	(43.7		)	—		—		(43.7		)	—		(43.7		)
Income taxes								49.3			4.6		53.9
Net income attributable to Alliant Energy common shareowners								349.5			8.8		358.3
Total assets	9,018.6			859.3		712.2		10,590.1			502.4		11,092.5
Investments in equity method subsidiaries	279.1			—		—		279.1			2.3		281.4
Construction and acquisition expenditures	677.3			47.0		7.3		731.6			66.7		798.3

Alliant Energy’s consolidated operating revenues by segment, which were substantially all related to services, were as follows:



	2015		2014		2013
Utility electric operations	85	%	81	%	82	%
Utility gas operations	12	%	15	%	14	%
Utility other	2	%	2	%	2	%
Other	1	%	2	%	2	%
	100	%	100	%	100	%

Certain financial information relating to IPL’s business segments was as follows (in millions):



2015	Electric		Gas		Other		Total
Operating revenues		$1,503.8		$217.3		$53.4		$1,774.5
Depreciation and amortization	187.9		17.5		1.8		207.2
Operating income	218.8		17.7		5.4		241.9
Interest expense							96.8
Income tax benefit							(22.7		)
Earnings available for common stock							186.0
Total assets	5,754.1		548.2		406.8		6,709.1
Construction and acquisition expenditures	561.2		56.7		1.4		619.3



2014	Electric		Gas		Other		Total
Operating revenues		$1,493.3		$296.5		$58.3		$1,848.1
Depreciation and amortization	178.7		17.0		1.8		197.5
Operating income	166.8		25.7		16.7		209.2
Interest expense							89.9
Income tax benefit							(48.9		)
Earnings available for common stock							181.6
Total assets	5,398.3		544.1		507.8		6,450.2
Construction and acquisition expenditures	490.0		35.1		0.9		526.0



2013	Electric		Gas		Other		Total
Operating revenues		$1,491.8		$273.9		$53.1		$1,818.8
Depreciation and amortization	173.1		16.5		1.5		191.1
Operating income	173.1		29.8		9.1		212.0
Interest expense							81.3
Income tax benefit							(36.3		)
Earnings available for common stock							172.0
Total assets	4,905.3		518.8		369.8		5,793.9
Construction and acquisition expenditures	365.4		27.5		7.3		400.2

Certain financial information relating to WPL’s business segments was as follows (in millions):



2015	Electric			Gas		Other			Total
Operating revenues		$1,266.7			$163.9		$4.5			$1,435.1
Depreciation and amortization	170.7			13.6		—			184.3
Operating income (loss)	295.3			16.9		(3.5		)	308.7
Interest expense									92.4
Equity income from unconsolidated investments	(35.1		)	—		—			(35.1		)
Income taxes									82.9
Earnings available for common stock									176.3
Total assets	4,457.2			391.1		422.1			5,270.4
Investments in equity method subsidiaries	302.0			—		—			302.0
Construction and acquisition expenditures	294.6			49.7		—			344.3



2014	Electric			Gas		Other			Total
Operating revenues		$1,220.3			$221.0		$7.8			$1,449.1
Depreciation and amortization	168.3			12.9		—			181.2
Operating income (loss)	275.6			28.1		(2.7		)	301.0
Interest expense									86.4
Equity income from unconsolidated investments	(42.8		)	—		—			(42.8		)
Income taxes									85.3
Earnings available for common stock									180.4
Total assets	4,262.1			369.4		486.1			5,117.6
Investments in equity method subsidiaries	294.3			—		—			294.3
Construction and acquisition expenditures	284.8			28.1		—			312.9



2013	Electric			Gas		Other			Total
Operating revenues		$1,197.2			$190.9		$18.2			$1,406.3
Depreciation and amortization	159.9			12.3		—			172.2
Operating income (loss)	271.4			27.5		(2.8		)	296.1
Interest expense									85.0
Equity income from unconsolidated investments	(43.7		)	—		—			(43.7		)
Income taxes									85.6
Earnings available for common stock									177.5
Total assets	4,113.3			340.5		342.4			4,796.2
Investments in equity method subsidiaries	279.1			—		—			279.1
Construction and acquisition expenditures	311.9			19.5		—			331.4