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Segments Of Business
12 Months Ended
Dec. 31, 2016
Segment Reporting Information [Line Items]  
Segments Of Business
SEGMENTS OF BUSINESS
Alliant Energy - Alliant Energy’s principal businesses as of December 31, 2016 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, which include Alliant Energy’s investment in ATC; 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.”
Non-regulated, 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’s businesses include Transportation, Non-regulated Generation and other non-regulated investments 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):
 
Utility
 
Non-Regulated,
 
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) loss from unconsolidated investments, net
(39.8
)
 

 

 
(39.8
)
 
0.2

 
(39.6
)
Income tax expense (benefit)
 
 
 
 
 
 
87.4

 
(28.0
)
 
59.4

Net income (loss) attributable to Alliant Energy common shareowners
 
 
 
 
 
 
406.0

 
(34.5
)
 
371.5

Total assets
11,040.5

 
1,091.1

 
781.0

 
12,912.6

 
461.2

 
13,373.8

Investments in equity method subsidiaries
325.3

 

 

 
325.3

 
0.7

 
326.0

Construction and acquisition expenditures
1,005.5

 
137.1

 
0.1

 
1,142.7

 
54.1

 
1,196.8

 
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



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):
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

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



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 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 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):
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
(39.8
)
 

 

 
(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
407.4

 
45.6

 

 
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
(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

IPL [Member]  
Segment Reporting Information [Line Items]  
Segments Of Business
SEGMENTS OF BUSINESS
Alliant Energy - Alliant Energy’s principal businesses as of December 31, 2016 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, which include Alliant Energy’s investment in ATC; 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.”
Non-regulated, 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’s businesses include Transportation, Non-regulated Generation and other non-regulated investments 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):
 
Utility
 
Non-Regulated,
 
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) loss from unconsolidated investments, net
(39.8
)
 

 

 
(39.8
)
 
0.2

 
(39.6
)
Income tax expense (benefit)
 
 
 
 
 
 
87.4

 
(28.0
)
 
59.4

Net income (loss) attributable to Alliant Energy common shareowners
 
 
 
 
 
 
406.0

 
(34.5
)
 
371.5

Total assets
11,040.5

 
1,091.1

 
781.0

 
12,912.6

 
461.2

 
13,373.8

Investments in equity method subsidiaries
325.3

 

 

 
325.3

 
0.7

 
326.0

Construction and acquisition expenditures
1,005.5

 
137.1

 
0.1

 
1,142.7

 
54.1

 
1,196.8

 
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



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):
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

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



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 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 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):
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
(39.8
)
 

 

 
(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
407.4

 
45.6

 

 
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
(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

WPL [Member]  
Segment Reporting Information [Line Items]  
Segments Of Business
SEGMENTS OF BUSINESS
Alliant Energy - Alliant Energy’s principal businesses as of December 31, 2016 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, which include Alliant Energy’s investment in ATC; 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.”
Non-regulated, 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’s businesses include Transportation, Non-regulated Generation and other non-regulated investments 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):
 
Utility
 
Non-Regulated,
 
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) loss from unconsolidated investments, net
(39.8
)
 

 

 
(39.8
)
 
0.2

 
(39.6
)
Income tax expense (benefit)
 
 
 
 
 
 
87.4

 
(28.0
)
 
59.4

Net income (loss) attributable to Alliant Energy common shareowners
 
 
 
 
 
 
406.0

 
(34.5
)
 
371.5

Total assets
11,040.5

 
1,091.1

 
781.0

 
12,912.6

 
461.2

 
13,373.8

Investments in equity method subsidiaries
325.3

 

 

 
325.3

 
0.7

 
326.0

Construction and acquisition expenditures
1,005.5

 
137.1

 
0.1

 
1,142.7

 
54.1

 
1,196.8

 
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



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):
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

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



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 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 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):
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
(39.8
)
 

 

 
(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
407.4

 
45.6

 

 
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
(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