LONG-TERM DEBT: LONG-TERM DEBT:	3 Months Ended
Mar. 31, 2016
Long-term Debt, Unclassified [Abstract]
Long-term Debt [Text Block]	LONG-TERM DEBT On March 10, 2016, Idaho Power issued $120 million in principal amount of 4.05% first mortgage bonds, secured medium-term notes, Series J, maturing on March 1, 2046. On April 11, 2016, Idaho Power redeemed, prior to maturity, $100 million in principal amount of 6.15% first mortgage bonds, medium-term notes, Series H due April 2019. In accordance with the redemption provisions of the notes, the redemption included Idaho Power's payment of a make-whole premium to the holders of the redeemed notes in the aggregate amount of $14 million. Idaho Power used a portion of the net proceeds from the March 2016 sale of first mortgage bonds, medium-term notes to effect the redemption. As a result, the $100 million of 6.15% first mortgage bonds, medium-term notes, Series H due April 2019 are classified as current maturities of long-term debt in the condensed consolidated balance sheets at March 31, 2016. As of March 31, 2016, $130 million in principal amount of long-term debt securities remained available for issuance under a selling agency agreement executed in July 2013 and pursuant to state regulatory authority. In March 2016, Idaho Power filed applications with the IPUC, OPUC, and Wyoming Public Service Commission seeking authorization to issue and sell from time to time up to $500 million in aggregate principal amount of debt securities and first mortgage bonds, to replace the remaining $130 million in principal amount of long-term debt securities authorized for issuance as of March 31, 2016.

LONG-TERM DEBT

On March 10, 2016, Idaho Power issued $120 million in principal amount of 4.05% first mortgage bonds, secured medium-term notes, Series J, maturing on March 1, 2046. On April 11, 2016, Idaho Power redeemed, prior to maturity, $100 million in principal amount of 6.15% first mortgage bonds, medium-term notes, Series H due April 2019. In accordance with the redemption provisions of the notes, the redemption included Idaho Power's payment of a make-whole premium to the holders of the redeemed notes in the aggregate amount of $14 million. Idaho Power used a portion of the net proceeds from the March 2016 sale of first mortgage bonds, medium-term notes to effect the redemption. As a result, the $100 million of 6.15% first mortgage bonds, medium-term notes, Series H due April 2019 are classified as current maturities of long-term debt in the condensed consolidated balance sheets at March 31, 2016.

As of March 31, 2016, $130 million in principal amount of long-term debt securities remained available for issuance under a selling agency agreement executed in July 2013 and pursuant to state regulatory authority. In March 2016, Idaho Power filed applications with the IPUC, OPUC, and Wyoming Public Service Commission seeking authorization to issue and sell from time to time up to $500 million in aggregate principal amount of debt securities and first mortgage bonds, to replace the remaining $130 million in principal amount of long-term debt securities authorized for issuance as of March 31, 2016.