Three Months Ended September 30,

Nine Months Ended September 30,

Basic

2020

2019

2020

2019

Numerator:

Net income attributable to Atlantic Power Corporation

$

16.2

$

12.6

$

40.0

$

22.7

Denominator:

Weighted average basic shares outstanding

89.5

109.4

98.1

109.4

Basic earnings per share attributable to Atlantic Power Corporation

$

0.18

$

0.12

$

0.41

$

0.21

Diluted

Numerator:

Net income attributable to Atlantic Power Corporation

$

16.2

$

12.6

$

40.0

$

22.7

Add: convertible debenture interest expense

1.0

2.8

3.1

17.2

13.6

42.8

25.8

Denominator:

Weighted average basic shares outstanding

89.5

109.4

98.1

109.4

Share-based compensation

0.9

1.0

0.9

1.0

Convertible debentures

27.4

27.9

117.8

137.8

126.4

138.3

Diluted earnings per share attributable to Atlantic Power Corporation

$

0.15

$

0.10

$

0.34

$

0.19