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Notes Payable to Banks, Commercial Paper, and Lines of Credit (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Short-Term Borrowings Information concerning short-term borrowings is shown below:

 

(In thousands)

 

MGE Energy(a)

 

 

 

MGE

 

 

 

As of December 31,

 

2019

 

 

2018

 

 

 

2019

 

 

2018

 

 

 

Available lines of credit

$

150,000

 

$

150,000

 

 

$

100,000

 

$

100,000

 

 

 

Short-term debt outstanding

$

-

 

$

13,000

 

 

$

-

 

$

13,000

 

 

 

Weighted-average interest rate

 

-

%

 

2.55

%

 

 

-

%

 

2.55

%

 

 

Year Ended December 31,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum short-term borrowings

$

56,000

 

$

31,500

 

 

$

56,000

 

$

31,500

 

 

 

Average short-term borrowings

$

18,364

 

$

9,211

 

 

$

18,364

 

$

9,211

 

 

 

Weighted-average interest rate

 

2.16

%

 

1.92

%

 

 

2.16

%

 

1.92

%

 

(a) MGE Energy short-term borrowings include MGE Energy and MGE lines of credit and MGE commercial paper.