Segments Of Business

12 Months Ended

Dec. 31, 2017

Segment Reporting Information [Line Items]

Segments Of Business

SEGMENTS OF BUSINESS

In the fourth quarter of 2017, Alliant Energy and WPL modified the segment reporting related to their ATC Investment, consistent with information used by their chief operating decision maker to evaluate performance and allocate resources. As of December 31, 2017, the ATC Investment is no longer included in Alliant Energy’s utility electric operations reportable segment or WPL’s electric operations reportable segment. As a result, all prior period amounts impacted by this change were reclassified to conform to the new presentation. Alliant Energy’s related amounts were reclassified from “Electric Utility” to “ATC Investment, Non-Utility, Parent and Other.” WPL’s related amounts were reclassified from “Electric” to “Other.”

Alliant Energy - Alliant Energy’s principal businesses as of December 31, 2017 are:

• Utility - includes the operations of IPL and WPL, which primarily serve retail customers in Iowa and Wisconsin. The utility business has three reportable segments: a) utility electric operations; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total Utility.”

• ATC Investment, Non-utility, Parent and Other - includes the operations of AEF and its subsidiaries, Corporate Services, the Alliant Energy parent company, and any Alliant Energy parent company consolidating adjustments. AEF is comprised of Alliant Energy’s ATC Investment, Transportation, a non-utility wind investment, the Sheboygan Falls Energy Facility and other non-utility investments, which are described in Note 1(a).

Alliant Energy’s administrative support services are directly charged to the applicable segment where practicable. In all other cases, administrative support services are allocated to the applicable segment based on services agreements. Intersegment revenues were not material to Alliant Energy’s operations and there was no single customer whose revenues were 10% or more of Alliant Energy’s consolidated revenues. All of Alliant Energy’s operations and assets are located in the U.S.

Certain financial information relating to Alliant Energy’s business segments, which represent the services provided to its customers, was as follows (in millions):

												ATC Investment,
	Utility											Non-utility,			Alliant Energy
2017	Electric			Gas		Other			Total			Parent and Other			Consolidated
Operating revenues		$2,894.7			$400.9		$47.5			$3,343.1			$39.1			$3,382.2
Depreciation and amortization	412.0			38.2		7.7			457.9			3.9			461.8
Operating income (loss)	586.5			45.3		(11.7		)	620.1			33.3			653.4
Interest expense									206.2			9.4			215.6
Equity income from unconsolidated investments, net	(0.7		)	—		—			(0.7		)	(44.1		)	(44.8		)
Income taxes									51.0			15.7			66.7
Net income attributable to Alliant Energy common shareowners									403.4			53.9			457.3
Total assets	11,396.2			1,199.8		766.5			13,362.5			825.3			14,187.8
Investments in equity method subsidiaries	8.3			—		—			8.3			373.1			381.4
Construction and acquisition expenditures	1,154.9			125.2		1.7			1,281.8			185.1			1,466.9

												ATC Investment,
	Utility											Non-utility,			Alliant Energy
2016	Electric			Gas		Other			Total			Parent and Other			Consolidated
Operating revenues		$2,875.5			$355.4		$48.6			$3,279.5			$40.5			$3,320.0
Depreciation and amortization	367.0			34.2		2.1			403.3			8.3			411.6
Operating income (loss)	571.9			30.7		(4.8		)	597.8			(60.8		)	537.0
Interest expense									194.6			1.6			196.2
Equity income from unconsolidated investments, net	(0.7		)	—		—			(0.7		)	(38.9		)	(39.6		)
Income tax expense (benefit)									71.4			(12.0		)	59.4
Net income (loss) attributable to Alliant Energy common shareowners									385.2			(13.7		)	371.5
Total assets	10,722.9			1,091.1		781.0			12,595.0			778.8			13,373.8
Investments in equity method subsidiaries	7.7			—		—			7.7			318.3			326.0
Construction and acquisition expenditures	994.0			137.1		0.1			1,131.2			65.6			1,196.8

											ATC Investment,
	Utility										Non-utility,			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 from unconsolidated investments, net	(0.9		)	—		—		(0.9		)	(32.9		)	(33.8		)
Income taxes								46.2			24.2			70.4
Net income attributable to Alliant Energy common shareowners								343.4			34.8			378.2
Total assets	9,918.0			939.3		828.9		11,686.2			809.0			12,495.2
Investments in equity method subsidiaries	8.7			—		—		8.7			294.2			302.9
Construction and acquisition expenditures	852.5			106.4		1.4		960.3			74.0			1,034.3

IPL - IPL is a utility primarily serving retail customers in Iowa and includes three reportable segments: a) electric operations; b) gas operations; and c) other, which includes steam operations and the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total.” Intersegment revenues were not material to IPL’s operations and there was no single customer whose revenues were 10% or more of IPL’s consolidated revenues. All of IPL’s operations and assets are located in the U.S. Certain financial information relating to IPL’s business segments, which represent the services provided to its customers, was as follows (in millions):

2017	Electric		Gas		Other			Total
Operating revenues		$1,598.9		$226.0		$45.4			$1,870.3
Depreciation and amortization	215.1		22.2		7.7			245.0
Operating income (loss)	281.1		20.8		(5.0		)	296.9
Interest expense								112.4
Income tax benefit								(10.9		)
Earnings available for common stock								216.8
Total assets	6,524.4		727.9		353.7			7,606.0
Construction and acquisition expenditures	594.1		80.7		1.2			676.0

2016	Electric		Gas		Other		Total
Operating revenues		$1,569.7		$204.0		$46.7		$1,820.4
Depreciation and amortization	189.4		19.3		2.1		210.8
Operating income	252.0		15.5		3.3		270.8
Interest expense							103.2
Income tax benefit							(5.9		)
Earnings available for common stock							215.6
Total assets	6,278.2		653.3		373.2		7,304.7
Construction and acquisition expenditures	598.1		91.5		0.1		689.7

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

WPL - WPL is a utility serving customers in Wisconsin and includes three reportable segments: a) electric operations; b) gas operations; and c) other, which includes WPL’s investment in ATC in 2015 and 2016, and the unallocated portions of the utility business. Refer to Note 6(a) for discussion of WPL’s transfer of its investment in ATC to ATI as of December 31, 2016. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total.” Intersegment revenues were not material to WPL’s operations and there was no single customer whose revenues were 10% or more of WPL’s consolidated revenues. All of WPL’s operations and assets are located in the U.S. Certain financial information relating to WPL’s business segments, which represent the services provided to its customers, was as follows (in millions):

2017	Electric			Gas		Other			Total
Operating revenues		$1,295.8			$174.9		$2.1			$1,472.8
Depreciation and amortization	196.9			16.0		—			212.9
Operating income (loss)	305.4			24.5		(6.7		)	323.2
Interest expense									93.8
Equity income from unconsolidated investments	(0.7		)	—		—			(0.7		)
Income taxes									61.9
Earnings available for common stock									186.6
Total assets	4,871.8			471.9		412.8			5,756.5
Investments in equity method subsidiaries	8.3			—		—			8.3
Construction and acquisition expenditures	592.4			44.5		0.5			637.4

2016	Electric			Gas		Other			Total
Operating revenues		$1,305.8			$151.4		$1.9			$1,459.1
Depreciation and amortization	177.6			14.9		—			192.5
Operating income (loss)	319.9			15.2		(8.1		)	327.0
Interest expense									91.4
Equity income from unconsolidated investments	(0.7		)	—		(39.1		)	(39.8		)
Income taxes									93.3
Earnings available for common stock									190.4
Total assets	4,444.7			437.8		407.8			5,290.3
Investments in equity method subsidiaries	7.7			—		—			7.7
Construction and acquisition expenditures	395.9			45.6		11.5			453.0

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	(0.9		)	—		(34.2		)	(35.1		)
Income taxes									82.9
Earnings available for common stock									176.3
Total assets	4,163.9			391.1		715.4			5,270.4
Investments in equity method subsidiaries	8.7			—		293.3			302.0
Construction and acquisition expenditures	291.3			49.7		3.3			344.3

IPL [Member]

Segment Reporting Information [Line Items]

Segments Of Business

SEGMENTS OF BUSINESS

In the fourth quarter of 2017, Alliant Energy and WPL modified the segment reporting related to their ATC Investment, consistent with information used by their chief operating decision maker to evaluate performance and allocate resources. As of December 31, 2017, the ATC Investment is no longer included in Alliant Energy’s utility electric operations reportable segment or WPL’s electric operations reportable segment. As a result, all prior period amounts impacted by this change were reclassified to conform to the new presentation. Alliant Energy’s related amounts were reclassified from “Electric Utility” to “ATC Investment, Non-Utility, Parent and Other.” WPL’s related amounts were reclassified from “Electric” to “Other.”

Alliant Energy - Alliant Energy’s principal businesses as of December 31, 2017 are:

• Utility - includes the operations of IPL and WPL, which primarily serve retail customers in Iowa and Wisconsin. The utility business has three reportable segments: a) utility electric operations; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total Utility.”

• ATC Investment, Non-utility, Parent and Other - includes the operations of AEF and its subsidiaries, Corporate Services, the Alliant Energy parent company, and any Alliant Energy parent company consolidating adjustments. AEF is comprised of Alliant Energy’s ATC Investment, Transportation, a non-utility wind investment, the Sheboygan Falls Energy Facility and other non-utility investments, which are described in Note 1(a).

Alliant Energy’s administrative support services are directly charged to the applicable segment where practicable. In all other cases, administrative support services are allocated to the applicable segment based on services agreements. Intersegment revenues were not material to Alliant Energy’s operations and there was no single customer whose revenues were 10% or more of Alliant Energy’s consolidated revenues. All of Alliant Energy’s operations and assets are located in the U.S.

Certain financial information relating to Alliant Energy’s business segments, which represent the services provided to its customers, was as follows (in millions):

												ATC Investment,
	Utility											Non-utility,			Alliant Energy
2017	Electric			Gas		Other			Total			Parent and Other			Consolidated
Operating revenues		$2,894.7			$400.9		$47.5			$3,343.1			$39.1			$3,382.2
Depreciation and amortization	412.0			38.2		7.7			457.9			3.9			461.8
Operating income (loss)	586.5			45.3		(11.7		)	620.1			33.3			653.4
Interest expense									206.2			9.4			215.6
Equity income from unconsolidated investments, net	(0.7		)	—		—			(0.7		)	(44.1		)	(44.8		)
Income taxes									51.0			15.7			66.7
Net income attributable to Alliant Energy common shareowners									403.4			53.9			457.3
Total assets	11,396.2			1,199.8		766.5			13,362.5			825.3			14,187.8
Investments in equity method subsidiaries	8.3			—		—			8.3			373.1			381.4
Construction and acquisition expenditures	1,154.9			125.2		1.7			1,281.8			185.1			1,466.9

												ATC Investment,
	Utility											Non-utility,			Alliant Energy
2016	Electric			Gas		Other			Total			Parent and Other			Consolidated
Operating revenues		$2,875.5			$355.4		$48.6			$3,279.5			$40.5			$3,320.0
Depreciation and amortization	367.0			34.2		2.1			403.3			8.3			411.6
Operating income (loss)	571.9			30.7		(4.8		)	597.8			(60.8		)	537.0
Interest expense									194.6			1.6			196.2
Equity income from unconsolidated investments, net	(0.7		)	—		—			(0.7		)	(38.9		)	(39.6		)
Income tax expense (benefit)									71.4			(12.0		)	59.4
Net income (loss) attributable to Alliant Energy common shareowners									385.2			(13.7		)	371.5
Total assets	10,722.9			1,091.1		781.0			12,595.0			778.8			13,373.8
Investments in equity method subsidiaries	7.7			—		—			7.7			318.3			326.0
Construction and acquisition expenditures	994.0			137.1		0.1			1,131.2			65.6			1,196.8

											ATC Investment,
	Utility										Non-utility,			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 from unconsolidated investments, net	(0.9		)	—		—		(0.9		)	(32.9		)	(33.8		)
Income taxes								46.2			24.2			70.4
Net income attributable to Alliant Energy common shareowners								343.4			34.8			378.2
Total assets	9,918.0			939.3		828.9		11,686.2			809.0			12,495.2
Investments in equity method subsidiaries	8.7			—		—		8.7			294.2			302.9
Construction and acquisition expenditures	852.5			106.4		1.4		960.3			74.0			1,034.3

IPL - IPL is a utility primarily serving retail customers in Iowa and includes three reportable segments: a) electric operations; b) gas operations; and c) other, which includes steam operations and the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total.” Intersegment revenues were not material to IPL’s operations and there was no single customer whose revenues were 10% or more of IPL’s consolidated revenues. All of IPL’s operations and assets are located in the U.S. Certain financial information relating to IPL’s business segments, which represent the services provided to its customers, was as follows (in millions):

2017	Electric		Gas		Other			Total
Operating revenues		$1,598.9		$226.0		$45.4			$1,870.3
Depreciation and amortization	215.1		22.2		7.7			245.0
Operating income (loss)	281.1		20.8		(5.0		)	296.9
Interest expense								112.4
Income tax benefit								(10.9		)
Earnings available for common stock								216.8
Total assets	6,524.4		727.9		353.7			7,606.0
Construction and acquisition expenditures	594.1		80.7		1.2			676.0

2016	Electric		Gas		Other		Total
Operating revenues		$1,569.7		$204.0		$46.7		$1,820.4
Depreciation and amortization	189.4		19.3		2.1		210.8
Operating income	252.0		15.5		3.3		270.8
Interest expense							103.2
Income tax benefit							(5.9		)
Earnings available for common stock							215.6
Total assets	6,278.2		653.3		373.2		7,304.7
Construction and acquisition expenditures	598.1		91.5		0.1		689.7

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

WPL - WPL is a utility serving customers in Wisconsin and includes three reportable segments: a) electric operations; b) gas operations; and c) other, which includes WPL’s investment in ATC in 2015 and 2016, and the unallocated portions of the utility business. Refer to Note 6(a) for discussion of WPL’s transfer of its investment in ATC to ATI as of December 31, 2016. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total.” Intersegment revenues were not material to WPL’s operations and there was no single customer whose revenues were 10% or more of WPL’s consolidated revenues. All of WPL’s operations and assets are located in the U.S. Certain financial information relating to WPL’s business segments, which represent the services provided to its customers, was as follows (in millions):

2017	Electric			Gas		Other			Total
Operating revenues		$1,295.8			$174.9		$2.1			$1,472.8
Depreciation and amortization	196.9			16.0		—			212.9
Operating income (loss)	305.4			24.5		(6.7		)	323.2
Interest expense									93.8
Equity income from unconsolidated investments	(0.7		)	—		—			(0.7		)
Income taxes									61.9
Earnings available for common stock									186.6
Total assets	4,871.8			471.9		412.8			5,756.5
Investments in equity method subsidiaries	8.3			—		—			8.3
Construction and acquisition expenditures	592.4			44.5		0.5			637.4

2016	Electric			Gas		Other			Total
Operating revenues		$1,305.8			$151.4		$1.9			$1,459.1
Depreciation and amortization	177.6			14.9		—			192.5
Operating income (loss)	319.9			15.2		(8.1		)	327.0
Interest expense									91.4
Equity income from unconsolidated investments	(0.7		)	—		(39.1		)	(39.8		)
Income taxes									93.3
Earnings available for common stock									190.4
Total assets	4,444.7			437.8		407.8			5,290.3
Investments in equity method subsidiaries	7.7			—		—			7.7
Construction and acquisition expenditures	395.9			45.6		11.5			453.0

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	(0.9		)	—		(34.2		)	(35.1		)
Income taxes									82.9
Earnings available for common stock									176.3
Total assets	4,163.9			391.1		715.4			5,270.4
Investments in equity method subsidiaries	8.7			—		293.3			302.0
Construction and acquisition expenditures	291.3			49.7		3.3			344.3

WPL [Member]

Segment Reporting Information [Line Items]

Segments Of Business

SEGMENTS OF BUSINESS

In the fourth quarter of 2017, Alliant Energy and WPL modified the segment reporting related to their ATC Investment, consistent with information used by their chief operating decision maker to evaluate performance and allocate resources. As of December 31, 2017, the ATC Investment is no longer included in Alliant Energy’s utility electric operations reportable segment or WPL’s electric operations reportable segment. As a result, all prior period amounts impacted by this change were reclassified to conform to the new presentation. Alliant Energy’s related amounts were reclassified from “Electric Utility” to “ATC Investment, Non-Utility, Parent and Other.” WPL’s related amounts were reclassified from “Electric” to “Other.”

Alliant Energy - Alliant Energy’s principal businesses as of December 31, 2017 are:

• Utility - includes the operations of IPL and WPL, which primarily serve retail customers in Iowa and Wisconsin. The utility business has three reportable segments: a) utility electric operations; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total Utility.”

• ATC Investment, Non-utility, Parent and Other - includes the operations of AEF and its subsidiaries, Corporate Services, the Alliant Energy parent company, and any Alliant Energy parent company consolidating adjustments. AEF is comprised of Alliant Energy’s ATC Investment, Transportation, a non-utility wind investment, the Sheboygan Falls Energy Facility and other non-utility investments, which are described in Note 1(a).

Alliant Energy’s administrative support services are directly charged to the applicable segment where practicable. In all other cases, administrative support services are allocated to the applicable segment based on services agreements. Intersegment revenues were not material to Alliant Energy’s operations and there was no single customer whose revenues were 10% or more of Alliant Energy’s consolidated revenues. All of Alliant Energy’s operations and assets are located in the U.S.

Certain financial information relating to Alliant Energy’s business segments, which represent the services provided to its customers, was as follows (in millions):

												ATC Investment,
	Utility											Non-utility,			Alliant Energy
2017	Electric			Gas		Other			Total			Parent and Other			Consolidated
Operating revenues		$2,894.7			$400.9		$47.5			$3,343.1			$39.1			$3,382.2
Depreciation and amortization	412.0			38.2		7.7			457.9			3.9			461.8
Operating income (loss)	586.5			45.3		(11.7		)	620.1			33.3			653.4
Interest expense									206.2			9.4			215.6
Equity income from unconsolidated investments, net	(0.7		)	—		—			(0.7		)	(44.1		)	(44.8		)
Income taxes									51.0			15.7			66.7
Net income attributable to Alliant Energy common shareowners									403.4			53.9			457.3
Total assets	11,396.2			1,199.8		766.5			13,362.5			825.3			14,187.8
Investments in equity method subsidiaries	8.3			—		—			8.3			373.1			381.4
Construction and acquisition expenditures	1,154.9			125.2		1.7			1,281.8			185.1			1,466.9

												ATC Investment,
	Utility											Non-utility,			Alliant Energy
2016	Electric			Gas		Other			Total			Parent and Other			Consolidated
Operating revenues		$2,875.5			$355.4		$48.6			$3,279.5			$40.5			$3,320.0
Depreciation and amortization	367.0			34.2		2.1			403.3			8.3			411.6
Operating income (loss)	571.9			30.7		(4.8		)	597.8			(60.8		)	537.0
Interest expense									194.6			1.6			196.2
Equity income from unconsolidated investments, net	(0.7		)	—		—			(0.7		)	(38.9		)	(39.6		)
Income tax expense (benefit)									71.4			(12.0		)	59.4
Net income (loss) attributable to Alliant Energy common shareowners									385.2			(13.7		)	371.5
Total assets	10,722.9			1,091.1		781.0			12,595.0			778.8			13,373.8
Investments in equity method subsidiaries	7.7			—		—			7.7			318.3			326.0
Construction and acquisition expenditures	994.0			137.1		0.1			1,131.2			65.6			1,196.8

											ATC Investment,
	Utility										Non-utility,			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 from unconsolidated investments, net	(0.9		)	—		—		(0.9		)	(32.9		)	(33.8		)
Income taxes								46.2			24.2			70.4
Net income attributable to Alliant Energy common shareowners								343.4			34.8			378.2
Total assets	9,918.0			939.3		828.9		11,686.2			809.0			12,495.2
Investments in equity method subsidiaries	8.7			—		—		8.7			294.2			302.9
Construction and acquisition expenditures	852.5			106.4		1.4		960.3			74.0			1,034.3

IPL - IPL is a utility primarily serving retail customers in Iowa and includes three reportable segments: a) electric operations; b) gas operations; and c) other, which includes steam operations and the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total.” Intersegment revenues were not material to IPL’s operations and there was no single customer whose revenues were 10% or more of IPL’s consolidated revenues. All of IPL’s operations and assets are located in the U.S. Certain financial information relating to IPL’s business segments, which represent the services provided to its customers, was as follows (in millions):

2017	Electric		Gas		Other			Total
Operating revenues		$1,598.9		$226.0		$45.4			$1,870.3
Depreciation and amortization	215.1		22.2		7.7			245.0
Operating income (loss)	281.1		20.8		(5.0		)	296.9
Interest expense								112.4
Income tax benefit								(10.9		)
Earnings available for common stock								216.8
Total assets	6,524.4		727.9		353.7			7,606.0
Construction and acquisition expenditures	594.1		80.7		1.2			676.0

2016	Electric		Gas		Other		Total
Operating revenues		$1,569.7		$204.0		$46.7		$1,820.4
Depreciation and amortization	189.4		19.3		2.1		210.8
Operating income	252.0		15.5		3.3		270.8
Interest expense							103.2
Income tax benefit							(5.9		)
Earnings available for common stock							215.6
Total assets	6,278.2		653.3		373.2		7,304.7
Construction and acquisition expenditures	598.1		91.5		0.1		689.7

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

WPL - WPL is a utility serving customers in Wisconsin and includes three reportable segments: a) electric operations; b) gas operations; and c) other, which includes WPL’s investment in ATC in 2015 and 2016, and the unallocated portions of the utility business. Refer to Note 6(a) for discussion of WPL’s transfer of its investment in ATC to ATI as of December 31, 2016. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total.” Intersegment revenues were not material to WPL’s operations and there was no single customer whose revenues were 10% or more of WPL’s consolidated revenues. All of WPL’s operations and assets are located in the U.S. Certain financial information relating to WPL’s business segments, which represent the services provided to its customers, was as follows (in millions):

2017	Electric			Gas		Other			Total
Operating revenues		$1,295.8			$174.9		$2.1			$1,472.8
Depreciation and amortization	196.9			16.0		—			212.9
Operating income (loss)	305.4			24.5		(6.7		)	323.2
Interest expense									93.8
Equity income from unconsolidated investments	(0.7		)	—		—			(0.7		)
Income taxes									61.9
Earnings available for common stock									186.6
Total assets	4,871.8			471.9		412.8			5,756.5
Investments in equity method subsidiaries	8.3			—		—			8.3
Construction and acquisition expenditures	592.4			44.5		0.5			637.4

2016	Electric			Gas		Other			Total
Operating revenues		$1,305.8			$151.4		$1.9			$1,459.1
Depreciation and amortization	177.6			14.9		—			192.5
Operating income (loss)	319.9			15.2		(8.1		)	327.0
Interest expense									91.4
Equity income from unconsolidated investments	(0.7		)	—		(39.1		)	(39.8		)
Income taxes									93.3
Earnings available for common stock									190.4
Total assets	4,444.7			437.8		407.8			5,290.3
Investments in equity method subsidiaries	7.7			—		—			7.7
Construction and acquisition expenditures	395.9			45.6		11.5			453.0

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	(0.9		)	—		(34.2		)	(35.1		)
Income taxes									82.9
Earnings available for common stock									176.3
Total assets	4,163.9			391.1		715.4			5,270.4
Investments in equity method subsidiaries	8.7			—		293.3			302.0
Construction and acquisition expenditures	291.3			49.7		3.3			344.3