NOTES PAYABLE: Notes Payable Level 4 (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) yr	Dec. 31, 2014 USD ($)
Short-term borrowings:
Commercial paper outstanding	$ 20,000,000	$ 31,300,000
Average commercial paper outstanding during the year	$ 22,054,000	$ 37,786,000
Weighted-average annual interest rate	0.88%	0.43%
Credit facility:
Number of extensions of credit agreement | yr	2
Extension Period of Credit Agreements	1 year
Prime Rate
Credit facility:
Debt Instrument, Description of Variable Rate Basis	prime rate
Federal Funds Rate
Credit facility:
Debt Instrument, Description of Variable Rate Basis	federal funds rate
Debt Instrument, Basis Spread on Variable Rate	0.50%
LIBOR Rate
Credit facility:
Debt Instrument, Description of Variable Rate Basis	LIBOR rate
Debt Instrument, Basis Spread on Variable Rate	1.00%
LIBOR rate floor	0.00%
IDACORP
Short-term borrowings:
Commercial paper outstanding	$ 20,000,000	$ 31,300,000
Average commercial paper outstanding during the year	$ 22,054,000	$ 37,786,000
Weighted-average annual interest rate	0.88%	0.43%
Credit facility:
Credit facility	$ 100,000,000
Swingline Loan, Maximum Principal Outstanding	10,000,000
Letter of Credit, Maximum Borrowing Capacity	50,000,000
Line of Credit Facility, Right to Increase Borrowing Capacity	150,000,000
Amount outstanding on credit facility	0
Idaho Power Company
Short-term borrowings:
Commercial paper outstanding	0	$ 0
Average commercial paper outstanding during the year	$ 0	$ 0
Weighted-average annual interest rate	0.00%	0.00%
Credit facility:
Credit facility	$ 300,000,000
Swingline Loan, Maximum Principal Outstanding	30,000,000
Letter of Credit, Maximum Borrowing Capacity	100,000,000
Line of Credit Facility, Right to Increase Borrowing Capacity	450,000,000
Amount outstanding on credit facility	0
Regulatory authority to incur short-term indebtedness	$ 450,000,000