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9 Months Ended
Sep. 30, 2016
Shedule of short term debt [Abstract]  
Schedule of Short-term Debt
Balances (in thousands of dollars) and interest rates of IDACORP’s and Idaho Power's short-term borrowings were as follows at September 30, 2016, and December 31, 2015:
 
 
September 30, 2016
 
December 31, 2015
 
 
Idaho Power
 
IDACORP
 
Total
 
Idaho Power
 
IDACORP
 
Total
Commercial paper outstanding
 
$

 
$
5,400

 
$
5,400

 
$

 
$
20,000

 
$
20,000

Weighted-average annual interest rate
 
%
 
0.86
%
 
0.86
%
 
%
 
0.88
%
 
0.88
%