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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of Weighted Average Depreciation Rates The composite weighted average depreciation rates for utility plant by function were as follows:

 

 

 

2019

 

 

2018

 

Generation

 

 

2.50

%

 

 

2.61

%

Transmission

 

 

2.57

%

 

 

2.74

%

Distribution

 

 

2.41

%

 

 

2.41

%

Storage

 

 

2.74

%

 

 

2.71

%

General and other

 

 

3.22

%

 

 

3.18

%