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Benefit Plans
6 Months Ended
Jun. 30, 2012
Benefit Plans
BENEFIT PLANS
(a) Pension and Other Postretirement Benefits Plans -
Net Periodic Benefit Costs (Credits) - The components of net periodic benefit costs (credits) for Alliant Energy’s, IPL’s and WPL’s sponsored defined benefit pension and other postretirement benefits plans, and defined benefit pension plans amounts directly assigned to IPL and WPL, for the three and six months ended June 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the qualified defined benefit pension plans costs represent only those respective costs for IPL’s and WPL’s bargaining unit employees covered under the plans that are sponsored by IPL and WPL, respectively. Also in the “IPL” and “WPL” tables below, the other postretirement benefits plans costs (credits) represent costs (credits) for all IPL and WPL employees, respectively. The “Directly assigned defined benefit pension plans” tables below include amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans.
Alliant Energy
Defined Benefit Pension Plans
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$3.4

 

$2.8

 

$6.7

 

$5.7

 

$1.8

 

$1.7

 

$3.5

 

$3.8

Interest cost
12.9

 
13.0

 
25.9

 
26.0

 
2.5

 
3.1

 
5.1

 
6.7

Expected return on plan assets
(17.2
)
 
(15.9
)
 
(34.4
)
 
(31.9
)
 
(1.9
)
 
(2.0
)
 
(3.8
)
 
(3.9
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)

 
0.2

 
0.1

 
0.4

 
(3.0
)
 
(2.5
)
 
(6.0
)
 
(3.2
)
Actuarial loss
8.3

 
5.3

 
16.6

 
10.5

 
1.5

 
1.4

 
3.1

 
2.8

Additional benefit costs (a)

 
8.9

 

 
8.9

 

 

 

 

 

$7.4

 

$14.3

 

$14.9

 

$19.6

 

$0.9

 

$1.7

 

$1.9

 

$6.2

IPL
Qualified Defined Benefit Pension Plans
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$1.9

 

$1.5

 

$3.8

 

$3.1

 

$0.7

 

$0.6

 

$1.5

 

$1.4

Interest cost
4.2

 
4.1

 
8.5

 
8.3

 
1.1

 
1.3

 
2.2

 
3.0

Expected return on plan assets
(5.7
)
 
(5.0
)
 
(11.5
)
 
(10.0
)
 
(1.3
)
 
(1.3
)
 
(2.6
)
 
(2.6
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
0.1

 
0.1

 
0.2

 
0.2

 
(1.6
)
 
(1.2
)
 
(3.2
)
 
(1.5
)
Actuarial loss
2.6

 
1.5

 
5.1

 
2.9

 
0.9

 
0.7

 
1.8

 
1.5

 

$3.1

 

$2.2

 

$6.1

 

$4.5

 

($0.2
)
 

$0.1

 

($0.3
)
 

$1.8

WPL
Qualified Defined Benefit Pension Plan
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$1.3

 

$1.1

 

$2.6

 

$2.3

 

$0.7

 

$0.7

 

$1.4

 

$1.5

Interest cost
4.1

 
4.0

 
8.2

 
8.0

 
1.1

 
1.2

 
2.1

 
2.6

Expected return on plan assets
(5.6
)
 
(5.0
)
 
(11.2
)
 
(10.0
)
 
(0.4
)
 
(0.4
)
 
(0.7
)
 
(0.7
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
0.1

 
0.2

 
0.2

 
0.3

 
(0.9
)
 
(0.8
)
 
(1.9
)
 
(1.1
)
Actuarial loss
3.0

 
1.7

 
6.1

 
3.5

 
0.5

 
0.6

 
1.1

 
1.1

 

$2.9

 

$2.0

 

$5.9

 

$4.1

 

$1.0

 

$1.3

 

$2.0

 

$3.4

Directly assigned defined benefit pension plans
IPL
 
WPL
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Interest cost

$1.7

 

$1.8

 

$3.5

 

$3.7

 

$1.3

 

$1.3

 

$2.6

 

$2.7

Expected return on plan assets
(2.4
)
 
(2.5
)
 
(4.8
)
 
(4.9
)
 
(1.8
)
 
(1.8
)
 
(3.6
)
 
(3.6
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit

 

 
(0.1
)
 
(0.1
)
 

 

 
(0.1
)
 
(0.1
)
Actuarial loss
0.9

 
0.8

 
1.9

 
1.5

 
0.9

 
0.7

 
1.8

 
1.4

Additional benefit costs (a)

 
2.2

 

 
2.2

 

 
0.6

 

 
0.6

 

$0.2

 

$2.3

 

$0.5

 

$2.4

 

$0.4

 

$0.8

 

$0.7

 

$1.0



(a)
Alliant Energy reached an agreement with the Internal Revenue Service (IRS), which resulted in a favorable determination letter for the Cash Balance Plan during the first quarter of 2011. The agreement with the IRS required Alliant Energy to amend the Cash Balance Plan, which was completed in the second quarter of 2011 resulting in aggregate additional benefits of $8.9 million paid to certain former participants in the Cash Balance Plan in August 2011. Alliant Energy recognized $8.9 million of additional benefits costs in the second quarter of 2011 related to these benefits. IPL was allocated $5.5 million ($2.2 million directly assigned and $3.3 million allocated by Corporate Services) and WPL was allocated $3.0 million ($0.6 million directly assigned and $2.4 million allocated by Corporate Services) of additional benefits costs in the second quarter of 2011 related to these benefits. Refer to Note 11(c) for additional information regarding the Cash Balance Plan.

Corporate Services provides services to IPL and WPL, and as a result, IPL and WPL are allocated pension and other postretirement benefits costs associated with Corporate Services employees. The following table includes the allocated qualified and non-qualified pension and other postretirement benefits costs associated with Corporate Services employees providing services to IPL and WPL for the three and six months ended June 30 (in millions):
 
Pension Benefits Costs (a)
 
Other Postretirement Benefits Costs
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
IPL

$0.5

 

$3.7

 

$1.0

 

$4.1

 

$0.1

 

$—

 

$0.1

 

$0.4

WPL
0.3

 
2.7

 
0.6

 
3.0

 

 
0.1

 

 
0.3



(a)
For both the three and six months ended June 30, 2011, additional qualified pension benefits costs resulting from the amendment to the Cash Balance Plan in the second quarter of 2011 allocated to IPL and WPL by Corporate Services were $3.3 million and $2.4 million, respectively.

Estimated Future and Actual Employer Contributions - Estimated and actual funding for the qualified defined benefit pension, non-qualified defined benefit pension and other postretirement benefits plans, and the directly assigned qualified and non-qualified defined benefit pension plans amounts for 2012 are as follows (in millions):
 
Estimated for Calendar Year 2012
 
Actual Through June 30, 2012
 
Alliant Energy
 
IPL
 
WPL
 
Alliant Energy
 
IPL
 
WPL
Qualified defined benefit pension plans

$—

 

$—

 

$—

 

$—

 

$—

 

$—

Non-qualified defined benefit pension plans (a)
17.0

 
N/A

 
N/A

 
2.6

 
N/A

 
N/A

Directly assigned defined benefit pension plans (b)
N/A

 
0.8

 
0.2

 
N/A

 
0.4

 
0.1

Other postretirement benefits plans
6.5

 
2.2

 
3.9

 
3.7

 
1.5

 
2.0


(a)
Alliant Energy sponsors several non-qualified defined benefit pension plans that cover certain current and former key employees of IPL and WPL. Alliant Energy allocates pension costs to IPL and WPL for these plans.
(b)
Amounts directly assigned to IPL and WPL for non-bargaining employees who are participants in Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans.

Cash Balance Plan - Refer to Note 11(c) for discussion of a class-action lawsuit filed against the Cash Balance Plan in 2008, and an agreement Alliant Energy reached with the IRS, which resulted in a favorable determination letter for the Cash Balance Plan in 2011.

401(k) Savings Plans - A significant number of Alliant Energy, IPL and WPL employees participate in defined contribution retirement plans (401(k) savings plans). For the three and six months ended June 30, costs related to the 401(k) savings plans, which are partially based on the participants’ level of contribution, were as follows (in millions):
 
Alliant Energy
 
IPL (a)
 
WPL (a)
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
401(k) costs

$4.5

 

$4.2

 

$9.7

 

$9.9

 

$2.3

 

$2.0

 

$5.0

 

$4.9

 

$1.9

 

$2.0

 

$4.2

 

$4.6


(a)
IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees.

(b) Equity Incentive Plans - A summary of compensation expense 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
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Compensation expense

$2.1

 

$2.6

 

$3.7

 

$4.8

 

$1.1

 

$1.4

 

$1.9

 

$2.6

 

$0.9

 

$1.0

 

$1.6

 

$1.9

Income tax benefits
0.9

 
1.0

 
1.5

 
1.9

 
0.5

 
0.5

 
0.8

 
1.0

 
0.3

 
0.4

 
0.6

 
0.8



As of June 30, 2012, total unrecognized compensation cost related to share-based compensation awards was $11.8 million, which is expected to be recognized over a weighted average period of between one and two years. Share-based compensation expense is recognized on a straight-line basis over the requisite service periods and is primarily recorded in “Utility - Other operation and maintenance” in the Condensed Consolidated Statements of Income.

In the first quarter of 2012, Alliant Energy granted performance shares, performance units, performance-contingent restricted stock and performance contingent cash awards to certain key employees. Payouts of nonvested awards issued in 2012 are prorated at retirement, death or disability based on time worked during the first year of the performance period and achievement of the performance criteria. Upon achievement of the performance criteria, payouts of these awards to participants who terminate employment after the first year of the performance period due to retirement, death or disability are not prorated. Participants’ nonvested awards issued in 2012 are forfeited if the participant voluntarily leaves Alliant Energy or is terminated for cause.

Performance Shares and Units - Alliant Energy assumes it will make future payouts of its performance shares and units in cash; therefore, performance shares and units are accounted for as liability awards.

Performance Shares - A summary of the performance shares activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares (a)
 
Shares (a)
Nonvested shares, January 1
236,979

 
234,518

Granted
45,612

 
64,217

Vested (b)
(111,980
)
 
(57,838
)
Forfeited
(25,334
)
 

Nonvested shares, June 30
145,277

 
240,897

 
(a)
Share amounts represent the target number of performance shares. Each performance share’s value is based on the price of one share of Alliant Energy’s common stock at the end of the performance period. The actual number of shares that will be paid out upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of shares.
(b)
In the first quarter of 2012, 111,980 performance shares granted in 2009 vested at 162.5% of the target, resulting in payouts valued at $8.0 million, which consisted of a combination of cash and common stock (6,399 shares). In the first quarter of 2011, 57,838 performance shares granted in 2008 vested at 75% of the target, resulting in payouts valued at $1.6 million, which consisted of a combination of cash and common stock (1,387 shares).

Performance Units - A summary of the performance unit activity for the six months ended June 30 was as follows:
 
 
2012
 
2011
 
Units (a)
 
Units (a)
Nonvested units, January 1
42,996

 
23,128

Granted
24,686

 
23,975

Forfeited
(878
)
 
(4,107
)
Nonvested units, June 30
66,804

 
42,996

 
(a)
Unit amounts represent the target number of performance units. Each performance unit’s value is based on the average price of one share of Alliant Energy’s common stock on the grant date of the award. The actual payout for performance units is dependent upon actual performance and may range from zero to 200% of the target number of units.

Fair Value of Awards - Information related to fair values of nonvested performance shares and units at June 30, 2012 by year of grant, were as follows:
 
Performance Shares
 
Performance Units
 
2012
 
2011
 
2010
 
2012
 
2011
 
2010
 
Grant
 
Grant
 
Grant
 
Grant
 
Grant
 
Grant
Nonvested awards
45,612

 
45,235

 
54,430

 
24,686

 
21,693

 
20,425

Alliant Energy common stock closing price on June 30, 2012

$45.57

 

$45.57

 

$45.57

 
 
 
 
 
 
Alliant Energy common stock average price on grant date
 
 
 
 
 
 

$43.05

 

$38.75

 

$32.56

Estimated payout percentage based on performance criteria
93
%
 
108
%
 
176
%
 
93
%
 
108
%
 
176
%
Fair values of each nonvested award

$42.38

 

$49.22

 

$80.20

 

$40.04

 

$41.85

 

$57.30



At June 30, 2012, fair values of nonvested performance shares and units were calculated using a Monte Carlo simulation to determine the anticipated total shareowner returns of Alliant Energy and its investor-owned utility peer groups. Expected volatility was based on historical volatilities using daily stock prices over the past three years. Expected dividend yields were calculated based on the most recent quarterly dividend rates announced prior to the measurement date and stock prices at the measurement date. The risk-free interest rate was based on the three-year U.S. Treasury rate in effect as of the measurement date.

Restricted Stock - Restricted stock consists of time-based and performance-contingent restricted stock.

Time-based restricted stock - A summary of the time-based restricted stock activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Fair Value
 
Shares
 
Weighted
Average
Fair Value
Nonvested shares, January 1
35,800

 

$30.87

 
70,033

 

$32.27

Granted during first quarter

 

 
5,000

 
39.86

Vested
(32,466
)
 
29.95

 
(38,433
)
 
34.61

Forfeited

 

 
(600
)
 
29.41

Nonvested shares, June 30
3,334

 
39.86

 
36,000

 
30.88



Performance-contingent restricted stock - A summary of the performance-contingent restricted stock activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Fair Value
 
Shares
 
Weighted
Average
Fair Value
Nonvested shares, January 1
301,738

 

$32.60

 
296,190

 

$32.32

Granted during first quarter
45,612

 
43.05

 
64,217

 
38.75

Vested
(65,172
)
 
32.56

 
(53,274
)
 
37.93

Forfeited
(70,527
)
 
39.93

 
(5,395
)
 
38.00

Nonvested shares, June 30
211,651

 
32.42

 
301,738

 
32.60



Non-qualified Stock Options - A summary of the stock option activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
Outstanding, January 1
63,889

 

$24.21

 
163,680

 

$24.51

Exercised
(27,453
)
 
23.79

 
(60,481
)
 
27.08

Outstanding and exercisable, June 30
36,436

 
24.52

 
103,199

 
23.01



The weighted average remaining contractual term for options outstanding and exercisable at June 30, 2012 was between one and two years. The aggregate intrinsic value of options outstanding and exercisable at June 30, 2012 was $0.8 million.

Other information related to stock option activity for the three and six months ended June 30 was as follows (in millions):
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
Cash received from stock options exercised

$0.4

 

$1.0

 

$0.7

 

$1.6

Aggregate intrinsic value of stock options exercised
0.3

 
0.6

 
0.5

 
0.8

Income tax benefit from the exercise of stock options
0.1

 
0.2

 
0.2

 
0.3



Performance Contingent Cash Awards - A summary of the performance contingent cash awards activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Awards
 
Awards
Nonvested awards, January 1
46,676

 
23,428

Granted
36,936

 
23,975

Vested (a)
(21,605
)
 

Forfeited
(1,533
)
 
(727
)
Nonvested awards, June 30
60,474

 
46,676

 
(a)
In the first quarter of 2012, 21,605 performance contingent cash awards granted in 2010 vested, resulting in cash payouts valued at $0.9 million.
IPL [Member]
 
Benefit Plans
BENEFIT PLANS
(a) Pension and Other Postretirement Benefits Plans -
Net Periodic Benefit Costs (Credits) - The components of net periodic benefit costs (credits) for Alliant Energy’s, IPL’s and WPL’s sponsored defined benefit pension and other postretirement benefits plans, and defined benefit pension plans amounts directly assigned to IPL and WPL, for the three and six months ended June 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the qualified defined benefit pension plans costs represent only those respective costs for IPL’s and WPL’s bargaining unit employees covered under the plans that are sponsored by IPL and WPL, respectively. Also in the “IPL” and “WPL” tables below, the other postretirement benefits plans costs (credits) represent costs (credits) for all IPL and WPL employees, respectively. The “Directly assigned defined benefit pension plans” tables below include amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans.
Alliant Energy
Defined Benefit Pension Plans
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$3.4

 

$2.8

 

$6.7

 

$5.7

 

$1.8

 

$1.7

 

$3.5

 

$3.8

Interest cost
12.9

 
13.0

 
25.9

 
26.0

 
2.5

 
3.1

 
5.1

 
6.7

Expected return on plan assets
(17.2
)
 
(15.9
)
 
(34.4
)
 
(31.9
)
 
(1.9
)
 
(2.0
)
 
(3.8
)
 
(3.9
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)

 
0.2

 
0.1

 
0.4

 
(3.0
)
 
(2.5
)
 
(6.0
)
 
(3.2
)
Actuarial loss
8.3

 
5.3

 
16.6

 
10.5

 
1.5

 
1.4

 
3.1

 
2.8

Additional benefit costs (a)

 
8.9

 

 
8.9

 

 

 

 

 

$7.4

 

$14.3

 

$14.9

 

$19.6

 

$0.9

 

$1.7

 

$1.9

 

$6.2

IPL
Qualified Defined Benefit Pension Plans
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$1.9

 

$1.5

 

$3.8

 

$3.1

 

$0.7

 

$0.6

 

$1.5

 

$1.4

Interest cost
4.2

 
4.1

 
8.5

 
8.3

 
1.1

 
1.3

 
2.2

 
3.0

Expected return on plan assets
(5.7
)
 
(5.0
)
 
(11.5
)
 
(10.0
)
 
(1.3
)
 
(1.3
)
 
(2.6
)
 
(2.6
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
0.1

 
0.1

 
0.2

 
0.2

 
(1.6
)
 
(1.2
)
 
(3.2
)
 
(1.5
)
Actuarial loss
2.6

 
1.5

 
5.1

 
2.9

 
0.9

 
0.7

 
1.8

 
1.5

 

$3.1

 

$2.2

 

$6.1

 

$4.5

 

($0.2
)
 

$0.1

 

($0.3
)
 

$1.8

WPL
Qualified Defined Benefit Pension Plan
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$1.3

 

$1.1

 

$2.6

 

$2.3

 

$0.7

 

$0.7

 

$1.4

 

$1.5

Interest cost
4.1

 
4.0

 
8.2

 
8.0

 
1.1

 
1.2

 
2.1

 
2.6

Expected return on plan assets
(5.6
)
 
(5.0
)
 
(11.2
)
 
(10.0
)
 
(0.4
)
 
(0.4
)
 
(0.7
)
 
(0.7
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
0.1

 
0.2

 
0.2

 
0.3

 
(0.9
)
 
(0.8
)
 
(1.9
)
 
(1.1
)
Actuarial loss
3.0

 
1.7

 
6.1

 
3.5

 
0.5

 
0.6

 
1.1

 
1.1

 

$2.9

 

$2.0

 

$5.9

 

$4.1

 

$1.0

 

$1.3

 

$2.0

 

$3.4

Directly assigned defined benefit pension plans
IPL
 
WPL
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Interest cost

$1.7

 

$1.8

 

$3.5

 

$3.7

 

$1.3

 

$1.3

 

$2.6

 

$2.7

Expected return on plan assets
(2.4
)
 
(2.5
)
 
(4.8
)
 
(4.9
)
 
(1.8
)
 
(1.8
)
 
(3.6
)
 
(3.6
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit

 

 
(0.1
)
 
(0.1
)
 

 

 
(0.1
)
 
(0.1
)
Actuarial loss
0.9

 
0.8

 
1.9

 
1.5

 
0.9

 
0.7

 
1.8

 
1.4

Additional benefit costs (a)

 
2.2

 

 
2.2

 

 
0.6

 

 
0.6

 

$0.2

 

$2.3

 

$0.5

 

$2.4

 

$0.4

 

$0.8

 

$0.7

 

$1.0



(a)
Alliant Energy reached an agreement with the Internal Revenue Service (IRS), which resulted in a favorable determination letter for the Cash Balance Plan during the first quarter of 2011. The agreement with the IRS required Alliant Energy to amend the Cash Balance Plan, which was completed in the second quarter of 2011 resulting in aggregate additional benefits of $8.9 million paid to certain former participants in the Cash Balance Plan in August 2011. Alliant Energy recognized $8.9 million of additional benefits costs in the second quarter of 2011 related to these benefits. IPL was allocated $5.5 million ($2.2 million directly assigned and $3.3 million allocated by Corporate Services) and WPL was allocated $3.0 million ($0.6 million directly assigned and $2.4 million allocated by Corporate Services) of additional benefits costs in the second quarter of 2011 related to these benefits. Refer to Note 11(c) for additional information regarding the Cash Balance Plan.

Corporate Services provides services to IPL and WPL, and as a result, IPL and WPL are allocated pension and other postretirement benefits costs associated with Corporate Services employees. The following table includes the allocated qualified and non-qualified pension and other postretirement benefits costs associated with Corporate Services employees providing services to IPL and WPL for the three and six months ended June 30 (in millions):
 
Pension Benefits Costs (a)
 
Other Postretirement Benefits Costs
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
IPL

$0.5

 

$3.7

 

$1.0

 

$4.1

 

$0.1

 

$—

 

$0.1

 

$0.4

WPL
0.3

 
2.7

 
0.6

 
3.0

 

 
0.1

 

 
0.3



(a)
For both the three and six months ended June 30, 2011, additional qualified pension benefits costs resulting from the amendment to the Cash Balance Plan in the second quarter of 2011 allocated to IPL and WPL by Corporate Services were $3.3 million and $2.4 million, respectively.

Estimated Future and Actual Employer Contributions - Estimated and actual funding for the qualified defined benefit pension, non-qualified defined benefit pension and other postretirement benefits plans, and the directly assigned qualified and non-qualified defined benefit pension plans amounts for 2012 are as follows (in millions):
 
Estimated for Calendar Year 2012
 
Actual Through June 30, 2012
 
Alliant Energy
 
IPL
 
WPL
 
Alliant Energy
 
IPL
 
WPL
Qualified defined benefit pension plans

$—

 

$—

 

$—

 

$—

 

$—

 

$—

Non-qualified defined benefit pension plans (a)
17.0

 
N/A

 
N/A

 
2.6

 
N/A

 
N/A

Directly assigned defined benefit pension plans (b)
N/A

 
0.8

 
0.2

 
N/A

 
0.4

 
0.1

Other postretirement benefits plans
6.5

 
2.2

 
3.9

 
3.7

 
1.5

 
2.0


(a)
Alliant Energy sponsors several non-qualified defined benefit pension plans that cover certain current and former key employees of IPL and WPL. Alliant Energy allocates pension costs to IPL and WPL for these plans.
(b)
Amounts directly assigned to IPL and WPL for non-bargaining employees who are participants in Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans.

Cash Balance Plan - Refer to Note 11(c) for discussion of a class-action lawsuit filed against the Cash Balance Plan in 2008, and an agreement Alliant Energy reached with the IRS, which resulted in a favorable determination letter for the Cash Balance Plan in 2011.

401(k) Savings Plans - A significant number of Alliant Energy, IPL and WPL employees participate in defined contribution retirement plans (401(k) savings plans). For the three and six months ended June 30, costs related to the 401(k) savings plans, which are partially based on the participants’ level of contribution, were as follows (in millions):
 
Alliant Energy
 
IPL (a)
 
WPL (a)
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
401(k) costs

$4.5

 

$4.2

 

$9.7

 

$9.9

 

$2.3

 

$2.0

 

$5.0

 

$4.9

 

$1.9

 

$2.0

 

$4.2

 

$4.6


(a)
IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees.

(b) Equity Incentive Plans - A summary of compensation expense 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
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Compensation expense

$2.1

 

$2.6

 

$3.7

 

$4.8

 

$1.1

 

$1.4

 

$1.9

 

$2.6

 

$0.9

 

$1.0

 

$1.6

 

$1.9

Income tax benefits
0.9

 
1.0

 
1.5

 
1.9

 
0.5

 
0.5

 
0.8

 
1.0

 
0.3

 
0.4

 
0.6

 
0.8



As of June 30, 2012, total unrecognized compensation cost related to share-based compensation awards was $11.8 million, which is expected to be recognized over a weighted average period of between one and two years. Share-based compensation expense is recognized on a straight-line basis over the requisite service periods and is primarily recorded in “Utility - Other operation and maintenance” in the Condensed Consolidated Statements of Income.

In the first quarter of 2012, Alliant Energy granted performance shares, performance units, performance-contingent restricted stock and performance contingent cash awards to certain key employees. Payouts of nonvested awards issued in 2012 are prorated at retirement, death or disability based on time worked during the first year of the performance period and achievement of the performance criteria. Upon achievement of the performance criteria, payouts of these awards to participants who terminate employment after the first year of the performance period due to retirement, death or disability are not prorated. Participants’ nonvested awards issued in 2012 are forfeited if the participant voluntarily leaves Alliant Energy or is terminated for cause.

Performance Shares and Units - Alliant Energy assumes it will make future payouts of its performance shares and units in cash; therefore, performance shares and units are accounted for as liability awards.

Performance Shares - A summary of the performance shares activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares (a)
 
Shares (a)
Nonvested shares, January 1
236,979

 
234,518

Granted
45,612

 
64,217

Vested (b)
(111,980
)
 
(57,838
)
Forfeited
(25,334
)
 

Nonvested shares, June 30
145,277

 
240,897

 
(a)
Share amounts represent the target number of performance shares. Each performance share’s value is based on the price of one share of Alliant Energy’s common stock at the end of the performance period. The actual number of shares that will be paid out upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of shares.
(b)
In the first quarter of 2012, 111,980 performance shares granted in 2009 vested at 162.5% of the target, resulting in payouts valued at $8.0 million, which consisted of a combination of cash and common stock (6,399 shares). In the first quarter of 2011, 57,838 performance shares granted in 2008 vested at 75% of the target, resulting in payouts valued at $1.6 million, which consisted of a combination of cash and common stock (1,387 shares).

Performance Units - A summary of the performance unit activity for the six months ended June 30 was as follows:
 
 
2012
 
2011
 
Units (a)
 
Units (a)
Nonvested units, January 1
42,996

 
23,128

Granted
24,686

 
23,975

Forfeited
(878
)
 
(4,107
)
Nonvested units, June 30
66,804

 
42,996

 
(a)
Unit amounts represent the target number of performance units. Each performance unit’s value is based on the average price of one share of Alliant Energy’s common stock on the grant date of the award. The actual payout for performance units is dependent upon actual performance and may range from zero to 200% of the target number of units.

Fair Value of Awards - Information related to fair values of nonvested performance shares and units at June 30, 2012 by year of grant, were as follows:
 
Performance Shares
 
Performance Units
 
2012
 
2011
 
2010
 
2012
 
2011
 
2010
 
Grant
 
Grant
 
Grant
 
Grant
 
Grant
 
Grant
Nonvested awards
45,612

 
45,235

 
54,430

 
24,686

 
21,693

 
20,425

Alliant Energy common stock closing price on June 30, 2012

$45.57

 

$45.57

 

$45.57

 
 
 
 
 
 
Alliant Energy common stock average price on grant date
 
 
 
 
 
 

$43.05

 

$38.75

 

$32.56

Estimated payout percentage based on performance criteria
93
%
 
108
%
 
176
%
 
93
%
 
108
%
 
176
%
Fair values of each nonvested award

$42.38

 

$49.22

 

$80.20

 

$40.04

 

$41.85

 

$57.30



At June 30, 2012, fair values of nonvested performance shares and units were calculated using a Monte Carlo simulation to determine the anticipated total shareowner returns of Alliant Energy and its investor-owned utility peer groups. Expected volatility was based on historical volatilities using daily stock prices over the past three years. Expected dividend yields were calculated based on the most recent quarterly dividend rates announced prior to the measurement date and stock prices at the measurement date. The risk-free interest rate was based on the three-year U.S. Treasury rate in effect as of the measurement date.

Restricted Stock - Restricted stock consists of time-based and performance-contingent restricted stock.

Time-based restricted stock - A summary of the time-based restricted stock activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Fair Value
 
Shares
 
Weighted
Average
Fair Value
Nonvested shares, January 1
35,800

 

$30.87

 
70,033

 

$32.27

Granted during first quarter

 

 
5,000

 
39.86

Vested
(32,466
)
 
29.95

 
(38,433
)
 
34.61

Forfeited

 

 
(600
)
 
29.41

Nonvested shares, June 30
3,334

 
39.86

 
36,000

 
30.88



Performance-contingent restricted stock - A summary of the performance-contingent restricted stock activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Fair Value
 
Shares
 
Weighted
Average
Fair Value
Nonvested shares, January 1
301,738

 

$32.60

 
296,190

 

$32.32

Granted during first quarter
45,612

 
43.05

 
64,217

 
38.75

Vested
(65,172
)
 
32.56

 
(53,274
)
 
37.93

Forfeited
(70,527
)
 
39.93

 
(5,395
)
 
38.00

Nonvested shares, June 30
211,651

 
32.42

 
301,738

 
32.60



Non-qualified Stock Options - A summary of the stock option activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
Outstanding, January 1
63,889

 

$24.21

 
163,680

 

$24.51

Exercised
(27,453
)
 
23.79

 
(60,481
)
 
27.08

Outstanding and exercisable, June 30
36,436

 
24.52

 
103,199

 
23.01



The weighted average remaining contractual term for options outstanding and exercisable at June 30, 2012 was between one and two years. The aggregate intrinsic value of options outstanding and exercisable at June 30, 2012 was $0.8 million.

Other information related to stock option activity for the three and six months ended June 30 was as follows (in millions):
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
Cash received from stock options exercised

$0.4

 

$1.0

 

$0.7

 

$1.6

Aggregate intrinsic value of stock options exercised
0.3

 
0.6

 
0.5

 
0.8

Income tax benefit from the exercise of stock options
0.1

 
0.2

 
0.2

 
0.3



Performance Contingent Cash Awards - A summary of the performance contingent cash awards activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Awards
 
Awards
Nonvested awards, January 1
46,676

 
23,428

Granted
36,936

 
23,975

Vested (a)
(21,605
)
 

Forfeited
(1,533
)
 
(727
)
Nonvested awards, June 30
60,474

 
46,676

 
(a)
In the first quarter of 2012, 21,605 performance contingent cash awards granted in 2010 vested, resulting in cash payouts valued at $0.9 million.
WPL [Member]
 
Benefit Plans
BENEFIT PLANS
(a) Pension and Other Postretirement Benefits Plans -
Net Periodic Benefit Costs (Credits) - The components of net periodic benefit costs (credits) for Alliant Energy’s, IPL’s and WPL’s sponsored defined benefit pension and other postretirement benefits plans, and defined benefit pension plans amounts directly assigned to IPL and WPL, for the three and six months ended June 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the qualified defined benefit pension plans costs represent only those respective costs for IPL’s and WPL’s bargaining unit employees covered under the plans that are sponsored by IPL and WPL, respectively. Also in the “IPL” and “WPL” tables below, the other postretirement benefits plans costs (credits) represent costs (credits) for all IPL and WPL employees, respectively. The “Directly assigned defined benefit pension plans” tables below include amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans.
Alliant Energy
Defined Benefit Pension Plans
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$3.4

 

$2.8

 

$6.7

 

$5.7

 

$1.8

 

$1.7

 

$3.5

 

$3.8

Interest cost
12.9

 
13.0

 
25.9

 
26.0

 
2.5

 
3.1

 
5.1

 
6.7

Expected return on plan assets
(17.2
)
 
(15.9
)
 
(34.4
)
 
(31.9
)
 
(1.9
)
 
(2.0
)
 
(3.8
)
 
(3.9
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)

 
0.2

 
0.1

 
0.4

 
(3.0
)
 
(2.5
)
 
(6.0
)
 
(3.2
)
Actuarial loss
8.3

 
5.3

 
16.6

 
10.5

 
1.5

 
1.4

 
3.1

 
2.8

Additional benefit costs (a)

 
8.9

 

 
8.9

 

 

 

 

 

$7.4

 

$14.3

 

$14.9

 

$19.6

 

$0.9

 

$1.7

 

$1.9

 

$6.2

IPL
Qualified Defined Benefit Pension Plans
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$1.9

 

$1.5

 

$3.8

 

$3.1

 

$0.7

 

$0.6

 

$1.5

 

$1.4

Interest cost
4.2

 
4.1

 
8.5

 
8.3

 
1.1

 
1.3

 
2.2

 
3.0

Expected return on plan assets
(5.7
)
 
(5.0
)
 
(11.5
)
 
(10.0
)
 
(1.3
)
 
(1.3
)
 
(2.6
)
 
(2.6
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
0.1

 
0.1

 
0.2

 
0.2

 
(1.6
)
 
(1.2
)
 
(3.2
)
 
(1.5
)
Actuarial loss
2.6

 
1.5

 
5.1

 
2.9

 
0.9

 
0.7

 
1.8

 
1.5

 

$3.1

 

$2.2

 

$6.1

 

$4.5

 

($0.2
)
 

$0.1

 

($0.3
)
 

$1.8

WPL
Qualified Defined Benefit Pension Plan
 
Other Postretirement Benefits Plans
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost

$1.3

 

$1.1

 

$2.6

 

$2.3

 

$0.7

 

$0.7

 

$1.4

 

$1.5

Interest cost
4.1

 
4.0

 
8.2

 
8.0

 
1.1

 
1.2

 
2.1

 
2.6

Expected return on plan assets
(5.6
)
 
(5.0
)
 
(11.2
)
 
(10.0
)
 
(0.4
)
 
(0.4
)
 
(0.7
)
 
(0.7
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
0.1

 
0.2

 
0.2

 
0.3

 
(0.9
)
 
(0.8
)
 
(1.9
)
 
(1.1
)
Actuarial loss
3.0

 
1.7

 
6.1

 
3.5

 
0.5

 
0.6

 
1.1

 
1.1

 

$2.9

 

$2.0

 

$5.9

 

$4.1

 

$1.0

 

$1.3

 

$2.0

 

$3.4

Directly assigned defined benefit pension plans
IPL
 
WPL
Three Months
 
Six Months
 
Three Months
 
Six Months
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Interest cost

$1.7

 

$1.8

 

$3.5

 

$3.7

 

$1.3

 

$1.3

 

$2.6

 

$2.7

Expected return on plan assets
(2.4
)
 
(2.5
)
 
(4.8
)
 
(4.9
)
 
(1.8
)
 
(1.8
)
 
(3.6
)
 
(3.6
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit

 

 
(0.1
)
 
(0.1
)
 

 

 
(0.1
)
 
(0.1
)
Actuarial loss
0.9

 
0.8

 
1.9

 
1.5

 
0.9

 
0.7

 
1.8

 
1.4

Additional benefit costs (a)

 
2.2

 

 
2.2

 

 
0.6

 

 
0.6

 

$0.2

 

$2.3

 

$0.5

 

$2.4

 

$0.4

 

$0.8

 

$0.7

 

$1.0



(a)
Alliant Energy reached an agreement with the Internal Revenue Service (IRS), which resulted in a favorable determination letter for the Cash Balance Plan during the first quarter of 2011. The agreement with the IRS required Alliant Energy to amend the Cash Balance Plan, which was completed in the second quarter of 2011 resulting in aggregate additional benefits of $8.9 million paid to certain former participants in the Cash Balance Plan in August 2011. Alliant Energy recognized $8.9 million of additional benefits costs in the second quarter of 2011 related to these benefits. IPL was allocated $5.5 million ($2.2 million directly assigned and $3.3 million allocated by Corporate Services) and WPL was allocated $3.0 million ($0.6 million directly assigned and $2.4 million allocated by Corporate Services) of additional benefits costs in the second quarter of 2011 related to these benefits. Refer to Note 11(c) for additional information regarding the Cash Balance Plan.

Corporate Services provides services to IPL and WPL, and as a result, IPL and WPL are allocated pension and other postretirement benefits costs associated with Corporate Services employees. The following table includes the allocated qualified and non-qualified pension and other postretirement benefits costs associated with Corporate Services employees providing services to IPL and WPL for the three and six months ended June 30 (in millions):
 
Pension Benefits Costs (a)
 
Other Postretirement Benefits Costs
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
IPL

$0.5

 

$3.7

 

$1.0

 

$4.1

 

$0.1

 

$—

 

$0.1

 

$0.4

WPL
0.3

 
2.7

 
0.6

 
3.0

 

 
0.1

 

 
0.3



(a)
For both the three and six months ended June 30, 2011, additional qualified pension benefits costs resulting from the amendment to the Cash Balance Plan in the second quarter of 2011 allocated to IPL and WPL by Corporate Services were $3.3 million and $2.4 million, respectively.

Estimated Future and Actual Employer Contributions - Estimated and actual funding for the qualified defined benefit pension, non-qualified defined benefit pension and other postretirement benefits plans, and the directly assigned qualified and non-qualified defined benefit pension plans amounts for 2012 are as follows (in millions):
 
Estimated for Calendar Year 2012
 
Actual Through June 30, 2012
 
Alliant Energy
 
IPL
 
WPL
 
Alliant Energy
 
IPL
 
WPL
Qualified defined benefit pension plans

$—

 

$—

 

$—

 

$—

 

$—

 

$—

Non-qualified defined benefit pension plans (a)
17.0

 
N/A

 
N/A

 
2.6

 
N/A

 
N/A

Directly assigned defined benefit pension plans (b)
N/A

 
0.8

 
0.2

 
N/A

 
0.4

 
0.1

Other postretirement benefits plans
6.5

 
2.2

 
3.9

 
3.7

 
1.5

 
2.0


(a)
Alliant Energy sponsors several non-qualified defined benefit pension plans that cover certain current and former key employees of IPL and WPL. Alliant Energy allocates pension costs to IPL and WPL for these plans.
(b)
Amounts directly assigned to IPL and WPL for non-bargaining employees who are participants in Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans.

Cash Balance Plan - Refer to Note 11(c) for discussion of a class-action lawsuit filed against the Cash Balance Plan in 2008, and an agreement Alliant Energy reached with the IRS, which resulted in a favorable determination letter for the Cash Balance Plan in 2011.

401(k) Savings Plans - A significant number of Alliant Energy, IPL and WPL employees participate in defined contribution retirement plans (401(k) savings plans). For the three and six months ended June 30, costs related to the 401(k) savings plans, which are partially based on the participants’ level of contribution, were as follows (in millions):
 
Alliant Energy
 
IPL (a)
 
WPL (a)
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
401(k) costs

$4.5

 

$4.2

 

$9.7

 

$9.9

 

$2.3

 

$2.0

 

$5.0

 

$4.9

 

$1.9

 

$2.0

 

$4.2

 

$4.6


(a)
IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees.

(b) Equity Incentive Plans - A summary of compensation expense 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
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Compensation expense

$2.1

 

$2.6

 

$3.7

 

$4.8

 

$1.1

 

$1.4

 

$1.9

 

$2.6

 

$0.9

 

$1.0

 

$1.6

 

$1.9

Income tax benefits
0.9

 
1.0

 
1.5

 
1.9

 
0.5

 
0.5

 
0.8

 
1.0

 
0.3

 
0.4

 
0.6

 
0.8



As of June 30, 2012, total unrecognized compensation cost related to share-based compensation awards was $11.8 million, which is expected to be recognized over a weighted average period of between one and two years. Share-based compensation expense is recognized on a straight-line basis over the requisite service periods and is primarily recorded in “Utility - Other operation and maintenance” in the Condensed Consolidated Statements of Income.

In the first quarter of 2012, Alliant Energy granted performance shares, performance units, performance-contingent restricted stock and performance contingent cash awards to certain key employees. Payouts of nonvested awards issued in 2012 are prorated at retirement, death or disability based on time worked during the first year of the performance period and achievement of the performance criteria. Upon achievement of the performance criteria, payouts of these awards to participants who terminate employment after the first year of the performance period due to retirement, death or disability are not prorated. Participants’ nonvested awards issued in 2012 are forfeited if the participant voluntarily leaves Alliant Energy or is terminated for cause.

Performance Shares and Units - Alliant Energy assumes it will make future payouts of its performance shares and units in cash; therefore, performance shares and units are accounted for as liability awards.

Performance Shares - A summary of the performance shares activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares (a)
 
Shares (a)
Nonvested shares, January 1
236,979

 
234,518

Granted
45,612

 
64,217

Vested (b)
(111,980
)
 
(57,838
)
Forfeited
(25,334
)
 

Nonvested shares, June 30
145,277

 
240,897

 
(a)
Share amounts represent the target number of performance shares. Each performance share’s value is based on the price of one share of Alliant Energy’s common stock at the end of the performance period. The actual number of shares that will be paid out upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of shares.
(b)
In the first quarter of 2012, 111,980 performance shares granted in 2009 vested at 162.5% of the target, resulting in payouts valued at $8.0 million, which consisted of a combination of cash and common stock (6,399 shares). In the first quarter of 2011, 57,838 performance shares granted in 2008 vested at 75% of the target, resulting in payouts valued at $1.6 million, which consisted of a combination of cash and common stock (1,387 shares).

Performance Units - A summary of the performance unit activity for the six months ended June 30 was as follows:
 
 
2012
 
2011
 
Units (a)
 
Units (a)
Nonvested units, January 1
42,996

 
23,128

Granted
24,686

 
23,975

Forfeited
(878
)
 
(4,107
)
Nonvested units, June 30
66,804

 
42,996

 
(a)
Unit amounts represent the target number of performance units. Each performance unit’s value is based on the average price of one share of Alliant Energy’s common stock on the grant date of the award. The actual payout for performance units is dependent upon actual performance and may range from zero to 200% of the target number of units.

Fair Value of Awards - Information related to fair values of nonvested performance shares and units at June 30, 2012 by year of grant, were as follows:
 
Performance Shares
 
Performance Units
 
2012
 
2011
 
2010
 
2012
 
2011
 
2010
 
Grant
 
Grant
 
Grant
 
Grant
 
Grant
 
Grant
Nonvested awards
45,612

 
45,235

 
54,430

 
24,686

 
21,693

 
20,425

Alliant Energy common stock closing price on June 30, 2012

$45.57

 

$45.57

 

$45.57

 
 
 
 
 
 
Alliant Energy common stock average price on grant date
 
 
 
 
 
 

$43.05

 

$38.75

 

$32.56

Estimated payout percentage based on performance criteria
93
%
 
108
%
 
176
%
 
93
%
 
108
%
 
176
%
Fair values of each nonvested award

$42.38

 

$49.22

 

$80.20

 

$40.04

 

$41.85

 

$57.30



At June 30, 2012, fair values of nonvested performance shares and units were calculated using a Monte Carlo simulation to determine the anticipated total shareowner returns of Alliant Energy and its investor-owned utility peer groups. Expected volatility was based on historical volatilities using daily stock prices over the past three years. Expected dividend yields were calculated based on the most recent quarterly dividend rates announced prior to the measurement date and stock prices at the measurement date. The risk-free interest rate was based on the three-year U.S. Treasury rate in effect as of the measurement date.

Restricted Stock - Restricted stock consists of time-based and performance-contingent restricted stock.

Time-based restricted stock - A summary of the time-based restricted stock activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Fair Value
 
Shares
 
Weighted
Average
Fair Value
Nonvested shares, January 1
35,800

 

$30.87

 
70,033

 

$32.27

Granted during first quarter

 

 
5,000

 
39.86

Vested
(32,466
)
 
29.95

 
(38,433
)
 
34.61

Forfeited

 

 
(600
)
 
29.41

Nonvested shares, June 30
3,334

 
39.86

 
36,000

 
30.88



Performance-contingent restricted stock - A summary of the performance-contingent restricted stock activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Fair Value
 
Shares
 
Weighted
Average
Fair Value
Nonvested shares, January 1
301,738

 

$32.60

 
296,190

 

$32.32

Granted during first quarter
45,612

 
43.05

 
64,217

 
38.75

Vested
(65,172
)
 
32.56

 
(53,274
)
 
37.93

Forfeited
(70,527
)
 
39.93

 
(5,395
)
 
38.00

Nonvested shares, June 30
211,651

 
32.42

 
301,738

 
32.60



Non-qualified Stock Options - A summary of the stock option activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Shares
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
Outstanding, January 1
63,889

 

$24.21

 
163,680

 

$24.51

Exercised
(27,453
)
 
23.79

 
(60,481
)
 
27.08

Outstanding and exercisable, June 30
36,436

 
24.52

 
103,199

 
23.01



The weighted average remaining contractual term for options outstanding and exercisable at June 30, 2012 was between one and two years. The aggregate intrinsic value of options outstanding and exercisable at June 30, 2012 was $0.8 million.

Other information related to stock option activity for the three and six months ended June 30 was as follows (in millions):
 
Three Months
 
Six Months
 
2012
 
2011
 
2012
 
2011
Cash received from stock options exercised

$0.4

 

$1.0

 

$0.7

 

$1.6

Aggregate intrinsic value of stock options exercised
0.3

 
0.6

 
0.5

 
0.8

Income tax benefit from the exercise of stock options
0.1

 
0.2

 
0.2

 
0.3



Performance Contingent Cash Awards - A summary of the performance contingent cash awards activity for the six months ended June 30 was as follows:
 
2012
 
2011
 
Awards
 
Awards
Nonvested awards, January 1
46,676

 
23,428

Granted
36,936

 
23,975

Vested (a)
(21,605
)
 

Forfeited
(1,533
)
 
(727
)
Nonvested awards, June 30
60,474

 
46,676

 
(a)
In the first quarter of 2012, 21,605 performance contingent cash awards granted in 2010 vested, resulting in cash payouts valued at $0.9 million.