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Benefit Plans
 6 Months Ended
Jun. 30, 2017
Benefit Plans
BENEFIT PLANS
NOTE 9(a) Pension and Other Postretirement Benefits Plans -
Net Periodic Benefit Costs - The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three and six months ended June 30 are included in the tables below (in millions). In IPL’s and WPL’s tables below, the defined benefit pension plan amounts represent those respective amounts for their bargaining unit employees covered under the qualified plans that they sponsor, as well as amounts directly assigned to them related to their current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In IPL’s and WPL’s tables below, the OPEB plans amounts represent respective amounts for their employees, as well as amounts directly assigned to them related to their current and former non-bargaining employees who are participants in the Corporate Services sponsored OPEB plan.
 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
Alliant Energy
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$3.1

 

$3.1

 

$6.2

 

$6.3

 

$1.3

 

$1.3

 

$2.5

 

$2.6

Interest cost
12.8

 
13.2

 
25.6

 
26.5

 
2.1

 
2.4

 
4.3

 
4.7

Expected return on plan assets
(16.4
)
 
(16.4
)
 
(32.8
)
 
(32.8
)
 
(1.6
)
 
(1.5
)
 
(3.1
)
 
(3.0
)
Amortization of prior service credit
(0.1
)
 
—

 
(0.2
)
 
(0.1
)
 
—

 
(1.1
)
 
(0.1
)
 
(2.1
)
Amortization of actuarial loss
9.4

 
9.4

 
18.8

 
18.7

 
0.9

 
1.2

 
1.9

 
2.4

 

$8.8

 

$9.3

 

$17.6

 

$18.6

 

$2.7

 

$2.3

 

$5.5

 

$4.6

 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
IPL
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$1.9

 

$1.9

 

$3.7

 

$3.8

 

$0.6

 

$0.6

 

$1.1

 

$1.2

Interest cost
5.8

 
6.2

 
11.7

 
12.3

 
0.9

 
0.9

 
1.8

 
1.9

Expected return on plan assets
(7.7
)
 
(7.8
)
 
(15.4
)
 
(15.5
)
 
(1.1
)
 
(1.2
)
 
(2.2
)
 
(2.2
)
Amortization of prior service credit
(0.1
)
 
(0.1
)
 
(0.1
)
 
(0.1
)
 
—

 
(0.6
)
 
—

 
(1.3
)
Amortization of actuarial loss
4.1

 
4.1

 
8.1

 
8.2

 
0.5

 
0.7

 
1.0

 
1.3

 

$4.0

 

$4.3

 

$8.0

 

$8.7

 

$0.9

 

$0.4

 

$1.7

 

$0.9

 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
WPL
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$1.2

 

$1.2

 

$2.4

 

$2.4

 

$0.4

 

$0.5

 

$0.9

 

$1.0

Interest cost
5.4

 
5.6

 
10.9

 
11.2

 
0.8

 
1.0

 
1.7

 
1.9

Expected return on plan assets
(7.1
)
 
(7.1
)
 
(14.2
)
 
(14.2
)
 
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.4
)
Amortization of prior service cost (credit)
—

 
—

 
—

 
0.1

 
—

 
(0.2
)
 
(0.1
)
 
(0.4
)
Amortization of actuarial loss
4.7

 
4.4

 
9.3

 
8.8

 
0.4

 
0.4

 
0.8

 
0.9

 

$4.2

 

$4.1

 

$8.4

 

$8.3

 

$1.4

 

$1.5

 

$2.9

 

$3.0



401(k) Savings Plan - A significant number of employees participate in a defined contribution retirement plan (401(k) savings plan). For the three and six months ended June 30, costs related to the 401(k) savings plan, which are partially based on the participants’ contributions and include allocated costs associated with Corporate Services employees for IPL and WPL, were as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
401(k) costs

$6.0

 

$5.7

 

$12.5

 

$11.9

 

$3.1

 

$2.9

 

$6.5

 

$6.0

 

$2.6

 

$2.6

 

$5.5

 

$5.4


NOTE 9(b) Equity-based Compensation Plans - A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three and six months ended June 30 was as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Compensation expense

$1.6

 

$7.1

 

$4.8

 

$12.4

 

$0.9

 

$3.7

 

$2.6

 

$6.5

 

$0.6

 

$3.1

 

$2.0

 

$5.4

Income tax benefits
0.6

 
2.9

 
1.9

 
5.1

 
0.4

 
1.6

 
1.1

 
2.7

 
0.3

 
1.3

 
0.8

 
2.2



As of June 30, 2017, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $10.5 million, $5.7 million and $4.4 million, respectively, which is expected to be recognized over a weighted average period of between one and two years.

Performance Shares and Performance Units - A summary of the performance shares and performance units activity for the six months ended June 30, 2017, with amounts representing the target number of awards, was as follows:
 
Performance
 
Performance
 
Shares
 
Units
Nonvested awards, January 1
257,599

 
93,320

Granted
65,350

 
21,558

Vested
(99,438
)
 
(37,395
)
Forfeited
—

 
(988
)
Nonvested awards, June 30
223,511

 
76,495



Vested Awards - During the six months ended June 30, 2017, certain performance shares and performance units that were granted in 2014 vested, resulting in payouts (a combination of cash and common stock for the performance shares and cash only for the performance units) as follows:
 
Performance
 
Performance
 
Shares
 
Units
Performance awards vested
99,438

 
37,395

Percentage of target number of performance awards
147.5
%
 
147.5
%
Aggregate payout value (in millions)

$5.6

 

$1.5

Payout - cash (in millions)

$5.1

 

$1.5

Payout - common stock shares issued
5,185

 
N/A

Fair Value of Awards - Information related to fair values of nonvested performance shares and performance units at June 30, 2017, by year of grant, was as follows:
 
Performance Shares
 
Performance Units
 
2017 Grant
 
2016 Grant
 
2015 Grant
 
2017 Grant
 
2016 Grant
 
2015 Grant
Nonvested awards at target
65,350

 
67,355

 
90,806

 
20,570

 
22,657

 
33,268

Alliant Energy common stock closing price on June 30, 2017

$40.17

 

$40.17

 

$40.17

 

$40.17

 

$40.17

 
N/A
Alliant Energy common stock closing price on grant date
N/A
 
N/A
 
N/A
 
N/A
 
N/A
 

$32.55

Estimated payout percentage based on performance criteria
100
%
 
143
%
 
113
%
 
100
%
 
143
%
 
113
%
Fair values of each nonvested award

$40.17

 

$57.44

 

$45.39

 

$40.17

 

$57.44

 

$36.78



Performance Restricted Stock Units - A summary of the performance restricted stock units activity for the six months ended June 30, 2017, with amounts representing the target number of units, was as follows:
 
Units
 
Weighted Average
Grant Date Fair Value
Nonvested units, January 1
67,355

 

$33.96

Granted
65,350

 
39.12

Nonvested units, June 30
132,705

 
36.50



Restricted Stock Units - A summary of the restricted stock units activity for the six months ended June 30, 2017, was as follows:
Nonvested units, January 1
57,736

Granted
56,013

Nonvested units, June 30
113,749
IPL [Member]  
Benefit Plans
BENEFIT PLANS
NOTE 9(a) Pension and Other Postretirement Benefits Plans -
Net Periodic Benefit Costs - The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three and six months ended June 30 are included in the tables below (in millions). In IPL’s and WPL’s tables below, the defined benefit pension plan amounts represent those respective amounts for their bargaining unit employees covered under the qualified plans that they sponsor, as well as amounts directly assigned to them related to their current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In IPL’s and WPL’s tables below, the OPEB plans amounts represent respective amounts for their employees, as well as amounts directly assigned to them related to their current and former non-bargaining employees who are participants in the Corporate Services sponsored OPEB plan.
 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
Alliant Energy
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$3.1

 

$3.1

 

$6.2

 

$6.3

 

$1.3

 

$1.3

 

$2.5

 

$2.6

Interest cost
12.8

 
13.2

 
25.6

 
26.5

 
2.1

 
2.4

 
4.3

 
4.7

Expected return on plan assets
(16.4
)
 
(16.4
)
 
(32.8
)
 
(32.8
)
 
(1.6
)
 
(1.5
)
 
(3.1
)
 
(3.0
)
Amortization of prior service credit
(0.1
)
 
—

 
(0.2
)
 
(0.1
)
 
—

 
(1.1
)
 
(0.1
)
 
(2.1
)
Amortization of actuarial loss
9.4

 
9.4

 
18.8

 
18.7

 
0.9

 
1.2

 
1.9

 
2.4

 

$8.8

 

$9.3

 

$17.6

 

$18.6

 

$2.7

 

$2.3

 

$5.5

 

$4.6

 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
IPL
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$1.9

 

$1.9

 

$3.7

 

$3.8

 

$0.6

 

$0.6

 

$1.1

 

$1.2

Interest cost
5.8

 
6.2

 
11.7

 
12.3

 
0.9

 
0.9

 
1.8

 
1.9

Expected return on plan assets
(7.7
)
 
(7.8
)
 
(15.4
)
 
(15.5
)
 
(1.1
)
 
(1.2
)
 
(2.2
)
 
(2.2
)
Amortization of prior service credit
(0.1
)
 
(0.1
)
 
(0.1
)
 
(0.1
)
 
—

 
(0.6
)
 
—

 
(1.3
)
Amortization of actuarial loss
4.1

 
4.1

 
8.1

 
8.2

 
0.5

 
0.7

 
1.0

 
1.3

 

$4.0

 

$4.3

 

$8.0

 

$8.7

 

$0.9

 

$0.4

 

$1.7

 

$0.9

 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
WPL
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$1.2

 

$1.2

 

$2.4

 

$2.4

 

$0.4

 

$0.5

 

$0.9

 

$1.0

Interest cost
5.4

 
5.6

 
10.9

 
11.2

 
0.8

 
1.0

 
1.7

 
1.9

Expected return on plan assets
(7.1
)
 
(7.1
)
 
(14.2
)
 
(14.2
)
 
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.4
)
Amortization of prior service cost (credit)
—

 
—

 
—

 
0.1

 
—

 
(0.2
)
 
(0.1
)
 
(0.4
)
Amortization of actuarial loss
4.7

 
4.4

 
9.3

 
8.8

 
0.4

 
0.4

 
0.8

 
0.9

 

$4.2

 

$4.1

 

$8.4

 

$8.3

 

$1.4

 

$1.5

 

$2.9

 

$3.0



401(k) Savings Plan - A significant number of employees participate in a defined contribution retirement plan (401(k) savings plan). For the three and six months ended June 30, costs related to the 401(k) savings plan, which are partially based on the participants’ contributions and include allocated costs associated with Corporate Services employees for IPL and WPL, were as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
401(k) costs

$6.0

 

$5.7

 

$12.5

 

$11.9

 

$3.1

 

$2.9

 

$6.5

 

$6.0

 

$2.6

 

$2.6

 

$5.5

 

$5.4


NOTE 9(b) Equity-based Compensation Plans - A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three and six months ended June 30 was as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Compensation expense

$1.6

 

$7.1

 

$4.8

 

$12.4

 

$0.9

 

$3.7

 

$2.6

 

$6.5

 

$0.6

 

$3.1

 

$2.0

 

$5.4

Income tax benefits
0.6

 
2.9

 
1.9

 
5.1

 
0.4

 
1.6

 
1.1

 
2.7

 
0.3

 
1.3

 
0.8

 
2.2



As of June 30, 2017, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $10.5 million, $5.7 million and $4.4 million, respectively, which is expected to be recognized over a weighted average period of between one and two years.

Performance Shares and Performance Units - A summary of the performance shares and performance units activity for the six months ended June 30, 2017, with amounts representing the target number of awards, was as follows:
 
Performance
 
Performance
 
Shares
 
Units
Nonvested awards, January 1
257,599

 
93,320

Granted
65,350

 
21,558

Vested
(99,438
)
 
(37,395
)
Forfeited
—

 
(988
)
Nonvested awards, June 30
223,511

 
76,495



Vested Awards - During the six months ended June 30, 2017, certain performance shares and performance units that were granted in 2014 vested, resulting in payouts (a combination of cash and common stock for the performance shares and cash only for the performance units) as follows:
 
Performance
 
Performance
 
Shares
 
Units
Performance awards vested
99,438

 
37,395

Percentage of target number of performance awards
147.5
%
 
147.5
%
Aggregate payout value (in millions)

$5.6

 

$1.5

Payout - cash (in millions)

$5.1

 

$1.5

Payout - common stock shares issued
5,185

 
N/A

Fair Value of Awards - Information related to fair values of nonvested performance shares and performance units at June 30, 2017, by year of grant, was as follows:
 
Performance Shares
 
Performance Units
 
2017 Grant
 
2016 Grant
 
2015 Grant
 
2017 Grant
 
2016 Grant
 
2015 Grant
Nonvested awards at target
65,350

 
67,355

 
90,806

 
20,570

 
22,657

 
33,268

Alliant Energy common stock closing price on June 30, 2017

$40.17

 

$40.17

 

$40.17

 

$40.17

 

$40.17

 
N/A
Alliant Energy common stock closing price on grant date
N/A
 
N/A
 
N/A
 
N/A
 
N/A
 

$32.55

Estimated payout percentage based on performance criteria
100
%
 
143
%
 
113
%
 
100
%
 
143
%
 
113
%
Fair values of each nonvested award

$40.17

 

$57.44

 

$45.39

 

$40.17

 

$57.44

 

$36.78



Performance Restricted Stock Units - A summary of the performance restricted stock units activity for the six months ended June 30, 2017, with amounts representing the target number of units, was as follows:
 
Units
 
Weighted Average
Grant Date Fair Value
Nonvested units, January 1
67,355

 

$33.96

Granted
65,350

 
39.12

Nonvested units, June 30
132,705

 
36.50



Restricted Stock Units - A summary of the restricted stock units activity for the six months ended June 30, 2017, was as follows:
Nonvested units, January 1
57,736

Granted
56,013

Nonvested units, June 30
113,749
WPL [Member]  
Benefit Plans
BENEFIT PLANS
NOTE 9(a) Pension and Other Postretirement Benefits Plans -
Net Periodic Benefit Costs - The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three and six months ended June 30 are included in the tables below (in millions). In IPL’s and WPL’s tables below, the defined benefit pension plan amounts represent those respective amounts for their bargaining unit employees covered under the qualified plans that they sponsor, as well as amounts directly assigned to them related to their current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In IPL’s and WPL’s tables below, the OPEB plans amounts represent respective amounts for their employees, as well as amounts directly assigned to them related to their current and former non-bargaining employees who are participants in the Corporate Services sponsored OPEB plan.
 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
Alliant Energy
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$3.1

 

$3.1

 

$6.2

 

$6.3

 

$1.3

 

$1.3

 

$2.5

 

$2.6

Interest cost
12.8

 
13.2

 
25.6

 
26.5

 
2.1

 
2.4

 
4.3

 
4.7

Expected return on plan assets
(16.4
)
 
(16.4
)
 
(32.8
)
 
(32.8
)
 
(1.6
)
 
(1.5
)
 
(3.1
)
 
(3.0
)
Amortization of prior service credit
(0.1
)
 
—

 
(0.2
)
 
(0.1
)
 
—

 
(1.1
)
 
(0.1
)
 
(2.1
)
Amortization of actuarial loss
9.4

 
9.4

 
18.8

 
18.7

 
0.9

 
1.2

 
1.9

 
2.4

 

$8.8

 

$9.3

 

$17.6

 

$18.6

 

$2.7

 

$2.3

 

$5.5

 

$4.6

 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
IPL
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$1.9

 

$1.9

 

$3.7

 

$3.8

 

$0.6

 

$0.6

 

$1.1

 

$1.2

Interest cost
5.8

 
6.2

 
11.7

 
12.3

 
0.9

 
0.9

 
1.8

 
1.9

Expected return on plan assets
(7.7
)
 
(7.8
)
 
(15.4
)
 
(15.5
)
 
(1.1
)
 
(1.2
)
 
(2.2
)
 
(2.2
)
Amortization of prior service credit
(0.1
)
 
(0.1
)
 
(0.1
)
 
(0.1
)
 
—

 
(0.6
)
 
—

 
(1.3
)
Amortization of actuarial loss
4.1

 
4.1

 
8.1

 
8.2

 
0.5

 
0.7

 
1.0

 
1.3

 

$4.0

 

$4.3

 

$8.0

 

$8.7

 

$0.9

 

$0.4

 

$1.7

 

$0.9

 
Defined Benefit Pension Plans
 
OPEB Plans
 
Three Months
 
Six Months
 
Three Months
 
Six Months
WPL
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$1.2

 

$1.2

 

$2.4

 

$2.4

 

$0.4

 

$0.5

 

$0.9

 

$1.0

Interest cost
5.4

 
5.6

 
10.9

 
11.2

 
0.8

 
1.0

 
1.7

 
1.9

Expected return on plan assets
(7.1
)
 
(7.1
)
 
(14.2
)
 
(14.2
)
 
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.4
)
Amortization of prior service cost (credit)
—

 
—

 
—

 
0.1

 
—

 
(0.2
)
 
(0.1
)
 
(0.4
)
Amortization of actuarial loss
4.7

 
4.4

 
9.3

 
8.8

 
0.4

 
0.4

 
0.8

 
0.9

 

$4.2

 

$4.1

 

$8.4

 

$8.3

 

$1.4

 

$1.5

 

$2.9

 

$3.0



401(k) Savings Plan - A significant number of employees participate in a defined contribution retirement plan (401(k) savings plan). For the three and six months ended June 30, costs related to the 401(k) savings plan, which are partially based on the participants’ contributions and include allocated costs associated with Corporate Services employees for IPL and WPL, were as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
401(k) costs

$6.0

 

$5.7

 

$12.5

 

$11.9

 

$3.1

 

$2.9

 

$6.5

 

$6.0

 

$2.6

 

$2.6

 

$5.5

 

$5.4


NOTE 9(b) Equity-based Compensation Plans - A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three and six months ended June 30 was as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Compensation expense

$1.6

 

$7.1

 

$4.8

 

$12.4

 

$0.9

 

$3.7

 

$2.6

 

$6.5

 

$0.6

 

$3.1

 

$2.0

 

$5.4

Income tax benefits
0.6

 
2.9

 
1.9

 
5.1

 
0.4

 
1.6

 
1.1

 
2.7

 
0.3

 
1.3

 
0.8

 
2.2



As of June 30, 2017, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $10.5 million, $5.7 million and $4.4 million, respectively, which is expected to be recognized over a weighted average period of between one and two years.

Performance Shares and Performance Units - A summary of the performance shares and performance units activity for the six months ended June 30, 2017, with amounts representing the target number of awards, was as follows:
 
Performance
 
Performance
 
Shares
 
Units
Nonvested awards, January 1
257,599

 
93,320

Granted
65,350

 
21,558

Vested
(99,438
)
 
(37,395
)
Forfeited
—

 
(988
)
Nonvested awards, June 30
223,511

 
76,495



Vested Awards - During the six months ended June 30, 2017, certain performance shares and performance units that were granted in 2014 vested, resulting in payouts (a combination of cash and common stock for the performance shares and cash only for the performance units) as follows:
 
Performance
 
Performance
 
Shares
 
Units
Performance awards vested
99,438

 
37,395

Percentage of target number of performance awards
147.5
%
 
147.5
%
Aggregate payout value (in millions)

$5.6

 

$1.5

Payout - cash (in millions)

$5.1

 

$1.5

Payout - common stock shares issued
5,185

 
N/A

Fair Value of Awards - Information related to fair values of nonvested performance shares and performance units at June 30, 2017, by year of grant, was as follows:
 
Performance Shares
 
Performance Units
 
2017 Grant
 
2016 Grant
 
2015 Grant
 
2017 Grant
 
2016 Grant
 
2015 Grant
Nonvested awards at target
65,350

 
67,355

 
90,806

 
20,570

 
22,657

 
33,268

Alliant Energy common stock closing price on June 30, 2017

$40.17

 

$40.17

 

$40.17

 

$40.17

 

$40.17

 
N/A
Alliant Energy common stock closing price on grant date
N/A
 
N/A
 
N/A
 
N/A
 
N/A
 

$32.55

Estimated payout percentage based on performance criteria
100
%
 
143
%
 
113
%
 
100
%
 
143
%
 
113
%
Fair values of each nonvested award

$40.17

 

$57.44

 

$45.39

 

$40.17

 

$57.44

 

$36.78



Performance Restricted Stock Units - A summary of the performance restricted stock units activity for the six months ended June 30, 2017, with amounts representing the target number of units, was as follows:
 
Units
 
Weighted Average
Grant Date Fair Value
Nonvested units, January 1
67,355

 

$33.96

Granted
65,350

 
39.12

Nonvested units, June 30
132,705

 
36.50



Restricted Stock Units - A summary of the restricted stock units activity for the six months ended June 30, 2017, was as follows:
Nonvested units, January 1
57,736

Granted
56,013

Nonvested units, June 30
113,749