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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Non-Qualified Stock Option Activity
A summary of all of our non-qualified stock option activity for the Calpine Equity Incentive Plans for the three months ended March 31, 2013, is as follows:
 
Number of
Shares
 
Weighted Average
Exercise Price
 
Weighted
Average
Remaining
Term
(in years)
 
Aggregate
Intrinsic Value
(in millions)
Outstanding — December 31, 2012
17,862,501

 
$
17.30

 
4.0
 
$
42

Granted
11,299

 
$
18.34

 
 
 
 
Exercised
580,975

 
$
15.75

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Expired
12,400

 
$
17.77

 
 
 
 
Outstanding — March 31, 2013
17,280,425

 
$
17.36

 
3.7
 
$
69

Exercisable — March 31, 2013
10,344,468

 
$
18.82

 
3.5
 
$
29

Vested and expected to vest – March 31, 2013
17,051,325

 
$
17.39

 
3.6
 
$
68
Schedule of Assumptions Used to Estimate Fair Value for Options
Certain assumptions were used in order to estimate fair value for options as noted in the following table:
 
2013
 
2012
Expected term (in years)(1)
6.5

 
 
6.5

 
Risk-free interest rate(2)
1.4

%
 
1.6

%
Expected volatility(3)
26

%
 
30

%
Dividend yield(4)
—

 
 
—

 
Weighted average grant-date fair value (per option)
$
5.31

 
 
$
5.18

 
___________
(1)
Expected term calculated using the simplified method prescribed by the SEC due to the lack of sufficient historical exercise data to provide a reasonable basis to estimate the expected term.
(2)
Zero Coupon U.S. Treasury rate or equivalent based on expected term.
(3)
Volatility calculated using the implied volatility of our exchange traded stock options.
(4)
We have never paid cash dividends on our common stock, and it is not anticipated that any cash dividends will be paid on our common stock in the near future.
Schedule of Restricted Stock and Restricted Stock Unit Activity
A summary of our restricted stock and restricted stock unit activity for the Calpine Equity Incentive Plans for the three months ended March 31, 2013, is as follows:
 
Number of
Restricted
Stock Awards
 
Weighted
Average
Grant-Date
Fair Value
Nonvested — December 31, 2012
4,134,037

 
$
14.33

Granted
1,719,783

 
$
18.40

Forfeited
26,941

 
$
15.07

Vested
1,075,603

 
$
11.54

Nonvested — March 31, 2013
4,751,276

 
$
16.44