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Segments Of Business
 9 Months Ended
Sep. 30, 2016
Segment Reporting Information [Line Items]  
Segments Of Business
SEGMENTS OF BUSINESS
Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations. Refer to Note 3 for discussion of asset valuation charges recorded in the third quarter of 2016 related to the Franklin County wind farm, which decreased the assets for “Non-Regulated, Parent and Other.”
 
Utility
 
Non-Regulated,
 
Alliant Energy
 
Electric
 
Gas
 
Other
 
Total
 
Parent and Other
 
Consolidated
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$864.3

 

$39.5

 

$9.4

 

$913.2

 

$11.4

 

$924.6

Operating income (loss)
244.2

 
(3.7
)
 
0.4

 
240.9

 
(78.3
)
 
162.6

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
183.1

 
(54.3
)
 
128.8

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(0.4
)
 
(0.4
)
Net income (loss)
 
 
 
 
 
 
183.1

 
(54.7
)
 
128.4

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$835.8

 

$38.0

 

$13.4

 

$887.2

 

$11.7

 

$898.9

Operating income (loss)
232.8

 
(5.7
)
 
0.2

 
227.3

 
8.6

 
235.9

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
184.5

 
(4.5
)
 
180.0

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(0.1
)
 
(0.1
)
Net income (loss)
 
 
 
 
 
 
184.5

 
(4.6
)
 
179.9

 
Utility
 
Non-Regulated,
 
Alliant Energy
 
Electric
 
Gas
 
Other
 
Total
 
Parent and Other
 
Consolidated
 
(in millions)
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$2,209.1

 

$248.7

 

$35.0

 

$2,492.8

 

$30.2

 

$2,523.0

Operating income (loss)
473.3

 
27.0

 
4.4

 
504.7

 
(67.6
)
 
437.1

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
350.3

 
(39.5
)
 
310.8

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(2.0
)
 
(2.0
)
Net income (loss)
 
 
 
 
 
 
350.3

 
(41.5
)
 
308.8

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$2,147.5

 

$288.1

 

$44.6

 

$2,480.2

 

$33.3

 

$2,513.5

Operating income
438.4

 
28.6

 
8.7

 
475.7

 
22.1

 
497.8

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations, net of tax
 
 
 
 
 
 
332.6

 
12.9

 
345.5

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(1.4
)
 
(1.4
)
Net income
 
 
 
 
 
 
332.6

 
11.5

 
344.1



IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.
 
Electric
 
Gas
 
Other
 
Total
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$483.2

 

$23.9

 

$9.1

 

$516.2

Operating income (loss)
125.9

 
(1.4
)
 
1.4

 
125.9

Earnings available for common stock
 
 
 
 
 
 
114.1

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$468.6

 

$23.1

 

$12.9

 

$504.6

Operating income (loss)
119.4

 
(2.9
)
 
0.5

 
117.0

Earnings available for common stock
 
 
 
 
 
 
116.5

Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$1,209.2

 

$142.6

 

$34.1

 

$1,385.9

Operating income
213.8

 
15.3

 
6.8

 
235.9

Earnings available for common stock
 
 
 
 
 
 
191.6

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$1,170.6

 

$164.1

 

$41.1

 

$1,375.8

Operating income
193.6

 
15.3

 
7.4

 
216.3

Earnings available for common stock
 
 
 
 
 
 
180.5



WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.
 
Electric
 
Gas
 
Other
 
Total
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$381.1

 

$15.6

 

$0.3

 

$397.0

Operating income (loss)
118.3

 
(2.3
)
 
(1.0
)
 
115.0

Earnings available for common stock
 
 
 
 
 
 
69.0

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$367.2

 

$14.9

 

$0.5

 

$382.6

Operating income (loss)
113.4

 
(2.8
)
 
(0.3
)
 
110.3

Earnings available for common stock
 
 
 
 
 
 
68.0

Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$999.9

 

$106.1

 

$0.9

 

$1,106.9

Operating income (loss)
259.5

 
11.7

 
(2.4
)
 
268.8

Earnings available for common stock
 
 
 
 
 
 
158.7

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$976.9

 

$124.0

 

$3.5

 

$1,104.4

Operating income
244.8

 
13.3

 
1.3

 
259.4

Earnings available for common stock
 
 
 
 
 
 
152.1
IPL [Member]  
Segment Reporting Information [Line Items]  
Segments Of Business
SEGMENTS OF BUSINESS
Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations. Refer to Note 3 for discussion of asset valuation charges recorded in the third quarter of 2016 related to the Franklin County wind farm, which decreased the assets for “Non-Regulated, Parent and Other.”
 
Utility
 
Non-Regulated,
 
Alliant Energy
 
Electric
 
Gas
 
Other
 
Total
 
Parent and Other
 
Consolidated
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$864.3

 

$39.5

 

$9.4

 

$913.2

 

$11.4

 

$924.6

Operating income (loss)
244.2

 
(3.7
)
 
0.4

 
240.9

 
(78.3
)
 
162.6

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
183.1

 
(54.3
)
 
128.8

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(0.4
)
 
(0.4
)
Net income (loss)
 
 
 
 
 
 
183.1

 
(54.7
)
 
128.4

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$835.8

 

$38.0

 

$13.4

 

$887.2

 

$11.7

 

$898.9

Operating income (loss)
232.8

 
(5.7
)
 
0.2

 
227.3

 
8.6

 
235.9

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
184.5

 
(4.5
)
 
180.0

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(0.1
)
 
(0.1
)
Net income (loss)
 
 
 
 
 
 
184.5

 
(4.6
)
 
179.9

 
Utility
 
Non-Regulated,
 
Alliant Energy
 
Electric
 
Gas
 
Other
 
Total
 
Parent and Other
 
Consolidated
 
(in millions)
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$2,209.1

 

$248.7

 

$35.0

 

$2,492.8

 

$30.2

 

$2,523.0

Operating income (loss)
473.3

 
27.0

 
4.4

 
504.7

 
(67.6
)
 
437.1

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
350.3

 
(39.5
)
 
310.8

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(2.0
)
 
(2.0
)
Net income (loss)
 
 
 
 
 
 
350.3

 
(41.5
)
 
308.8

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$2,147.5

 

$288.1

 

$44.6

 

$2,480.2

 

$33.3

 

$2,513.5

Operating income
438.4

 
28.6

 
8.7

 
475.7

 
22.1

 
497.8

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations, net of tax
 
 
 
 
 
 
332.6

 
12.9

 
345.5

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(1.4
)
 
(1.4
)
Net income
 
 
 
 
 
 
332.6

 
11.5

 
344.1



IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.
 
Electric
 
Gas
 
Other
 
Total
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$483.2

 

$23.9

 

$9.1

 

$516.2

Operating income (loss)
125.9

 
(1.4
)
 
1.4

 
125.9

Earnings available for common stock
 
 
 
 
 
 
114.1

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$468.6

 

$23.1

 

$12.9

 

$504.6

Operating income (loss)
119.4

 
(2.9
)
 
0.5

 
117.0

Earnings available for common stock
 
 
 
 
 
 
116.5

Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$1,209.2

 

$142.6

 

$34.1

 

$1,385.9

Operating income
213.8

 
15.3

 
6.8

 
235.9

Earnings available for common stock
 
 
 
 
 
 
191.6

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$1,170.6

 

$164.1

 

$41.1

 

$1,375.8

Operating income
193.6

 
15.3

 
7.4

 
216.3

Earnings available for common stock
 
 
 
 
 
 
180.5



WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.
 
Electric
 
Gas
 
Other
 
Total
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$381.1

 

$15.6

 

$0.3

 

$397.0

Operating income (loss)
118.3

 
(2.3
)
 
(1.0
)
 
115.0

Earnings available for common stock
 
 
 
 
 
 
69.0

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$367.2

 

$14.9

 

$0.5

 

$382.6

Operating income (loss)
113.4

 
(2.8
)
 
(0.3
)
 
110.3

Earnings available for common stock
 
 
 
 
 
 
68.0

Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$999.9

 

$106.1

 

$0.9

 

$1,106.9

Operating income (loss)
259.5

 
11.7

 
(2.4
)
 
268.8

Earnings available for common stock
 
 
 
 
 
 
158.7

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$976.9

 

$124.0

 

$3.5

 

$1,104.4

Operating income
244.8

 
13.3

 
1.3

 
259.4

Earnings available for common stock
 
 
 
 
 
 
152.1
WPL [Member]  
Segment Reporting Information [Line Items]  
Segments Of Business
SEGMENTS OF BUSINESS
Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations. Refer to Note 3 for discussion of asset valuation charges recorded in the third quarter of 2016 related to the Franklin County wind farm, which decreased the assets for “Non-Regulated, Parent and Other.”
 
Utility
 
Non-Regulated,
 
Alliant Energy
 
Electric
 
Gas
 
Other
 
Total
 
Parent and Other
 
Consolidated
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$864.3

 

$39.5

 

$9.4

 

$913.2

 

$11.4

 

$924.6

Operating income (loss)
244.2

 
(3.7
)
 
0.4

 
240.9

 
(78.3
)
 
162.6

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
183.1

 
(54.3
)
 
128.8

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(0.4
)
 
(0.4
)
Net income (loss)
 
 
 
 
 
 
183.1

 
(54.7
)
 
128.4

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$835.8

 

$38.0

 

$13.4

 

$887.2

 

$11.7

 

$898.9

Operating income (loss)
232.8

 
(5.7
)
 
0.2

 
227.3

 
8.6

 
235.9

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
184.5

 
(4.5
)
 
180.0

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(0.1
)
 
(0.1
)
Net income (loss)
 
 
 
 
 
 
184.5

 
(4.6
)
 
179.9

 
Utility
 
Non-Regulated,
 
Alliant Energy
 
Electric
 
Gas
 
Other
 
Total
 
Parent and Other
 
Consolidated
 
(in millions)
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$2,209.1

 

$248.7

 

$35.0

 

$2,492.8

 

$30.2

 

$2,523.0

Operating income (loss)
473.3

 
27.0

 
4.4

 
504.7

 
(67.6
)
 
437.1

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
350.3

 
(39.5
)
 
310.8

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(2.0
)
 
(2.0
)
Net income (loss)
 
 
 
 
 
 
350.3

 
(41.5
)
 
308.8

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$2,147.5

 

$288.1

 

$44.6

 

$2,480.2

 

$33.3

 

$2,513.5

Operating income
438.4

 
28.6

 
8.7

 
475.7

 
22.1

 
497.8

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations, net of tax
 
 
 
 
 
 
332.6

 
12.9

 
345.5

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(1.4
)
 
(1.4
)
Net income
 
 
 
 
 
 
332.6

 
11.5

 
344.1



IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.
 
Electric
 
Gas
 
Other
 
Total
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$483.2

 

$23.9

 

$9.1

 

$516.2

Operating income (loss)
125.9

 
(1.4
)
 
1.4

 
125.9

Earnings available for common stock
 
 
 
 
 
 
114.1

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$468.6

 

$23.1

 

$12.9

 

$504.6

Operating income (loss)
119.4

 
(2.9
)
 
0.5

 
117.0

Earnings available for common stock
 
 
 
 
 
 
116.5

Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$1,209.2

 

$142.6

 

$34.1

 

$1,385.9

Operating income
213.8

 
15.3

 
6.8

 
235.9

Earnings available for common stock
 
 
 
 
 
 
191.6

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$1,170.6

 

$164.1

 

$41.1

 

$1,375.8

Operating income
193.6

 
15.3

 
7.4

 
216.3

Earnings available for common stock
 
 
 
 
 
 
180.5



WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.
 
Electric
 
Gas
 
Other
 
Total
 
(in millions)
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$381.1

 

$15.6

 

$0.3

 

$397.0

Operating income (loss)
118.3

 
(2.3
)
 
(1.0
)
 
115.0

Earnings available for common stock
 
 
 
 
 
 
69.0

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$367.2

 

$14.9

 

$0.5

 

$382.6

Operating income (loss)
113.4

 
(2.8
)
 
(0.3
)
 
110.3

Earnings available for common stock
 
 
 
 
 
 
68.0

Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenues

$999.9

 

$106.1

 

$0.9

 

$1,106.9

Operating income (loss)
259.5

 
11.7

 
(2.4
)
 
268.8

Earnings available for common stock
 
 
 
 
 
 
158.7

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
Operating revenues

$976.9

 

$124.0

 

$3.5

 

$1,104.4

Operating income
244.8

 
13.3

 
1.3

 
259.4

Earnings available for common stock
 
 
 
 
 
 
152.1