NOTES PAYABLE: Level 4 (Details) (USD $)	Jun. 30, 2013 credit_agreement_extensions	Dec. 31, 2012
Short-term borrowings:
Commercial paper outstanding	$ 61,900,000	$ 69,700,000
Weighted-average annual interest rate	0.37%	0.50%
Credit facility:
Number of Credit Agreement Extensions	2
Extension Period of Credit Agreements	1 year
Federal Funds Rate
Credit facility:
Debt Instrument, Basis Spread on Variable Rate	0.50%
LIBOR Rate
Credit facility:
Debt Instrument, Basis Spread on Variable Rate	1.00%
IDACORP
Short-term borrowings:
Commercial paper outstanding	61,900,000	69,700,000
Weighted-average annual interest rate	0.37%	0.50%
Credit facility:
Credit facility	125,000,000
Swingline Loan, Maximum Principal Outstanding	15,000,000
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
Weighted-average annual interest rate	0.00%	0.00%
Credit facility:
Credit facility	300,000,000
Swingline Loan, Maximum Principal Outstanding	30,000,000
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