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Income Tax (Tables)
 6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Reconciliation
Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes for the six months ended June 30, 2019 and 2018 is as follows:

 
Con Edison
CECONY
(% of Pre-tax income)
2019

2018

2019

2018

STATUTORY TAX RATE
 
 
 
 
Federal
21
 %
21
 %
21
 %
21
 %
Changes in computed taxes resulting from:
 
 
 
 
State income tax
4

5

4

5

Cost of removal
1

1

1

1

Other plant-related items
(1
)
(1
)
(1
)
(1
)
Renewable energy credits
(2
)
(2
)
—

—

Amortization of excess deferred federal income taxes
(5
)
(4
)
(4
)
(4
)
Effective tax rate
18
 %
20
 %
21
 %
22
 %

Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes for the three months ended June 30, 2019 and 2018 is as follows:

 
Con Edison
CECONY
(% of Pre-tax income)
2019

2018

2019

2018

STATUTORY TAX RATE
 
 
 
 
Federal
21
 %
21
 %
21
 %
21
 %
Changes in computed taxes resulting from:
 
 
 
 
State income tax
3

5

3

4

Cost of removal
2

2

2

2

Other plant-related items
(2
)
(1
)
(1
)
(1
)
Renewable energy credits
(5
)
(3
)
—

—

Reserve for uncertain tax positions
2

—

—

—

Amortization of excess deferred federal income taxes
(10
)
(7
)
(9
)
(8
)
Other
—

—

(1
)
(1
)
Effective tax rate
11
 %
17
 %
15
 %
17
 %