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9 Months Ended
Sep. 30, 2017
Shedule of short term debt [Abstract]  
Schedule of Short-term Debt

Balances (in thousands) and interest rates of IDACORP’s and Idaho Power's short-term borrowings were as follows at September 30, 2017, and December 31, 2016:
 
 
September 30, 2017
 
December 31, 2016
 
 
IDACORP
 
Idaho Power
 
Total
 
IDACORP
 
Idaho Power
 
Total
Commercial paper outstanding
 
$
2,425

 
$

 
$
2,425

 
$

 
$
21,800

 
$
21,800

Weighted-average annual interest rate
 
1.54
%
 
%
 
1.54
%
 
%
 
1.13
%
 
1.13
%