The aggregate amount of write-downs for impairments recognized during the period for receivables.

No definition available.

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The investment tax credit allowed by the state of Idaho.

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No definition available.

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The amount, expressed as a percentage of the bill, of the late payment fee assessed on customer billings in arrears.

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No definition available.

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The maturity period of short-term investments, as of the reporting date.

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No definition available.

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The period of time after which unpaid customer accounts are deemed to be in arrears.

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No definition available.

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Significant Accounting Policies [Line Items]

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No definition available.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly) - maximum amount of partnership interests.

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No definition available.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly) - minimum amount of partnership interests.

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No definition available.

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- Definition

The amount of intercompany long-term debt of the consolidated Variable Interest Entity eliminated in consolidation.

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No definition available.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the partner in the VIE (directly or indirectly).

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No definition available.

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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No definition available.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher SEC
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- Definition

Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

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-Publisher FASB
-Name Accounting Standards Codification
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Effective rate, including composite rate, of cost of financing additions to qualifying regulated assets, commonly called allowance for funds used during construction.

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-Publisher FASB
-Name Accounting Standards Codification
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Composite depreciation rate for public utility plants in service.

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No definition available.

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Period end amount of total net PPE.

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No definition available.

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The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.

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No definition available.

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Net carrying amount of the assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), when the reporting entity is not the VIE's primary beneficiary.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Summary of Significant Accounting Policies Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies
Debt Issuance Cost	$ 16,500	$ 15,800
Utility plant in service - net	$ 3,571,537	3,407,201
Maturity period of short-term investments	90 days
Late Payment Fee Customer Billings	1.00%
Period of Time After Which Unpaid Accounts Are Deemed Late	30 days
Impairment of Receivables	$ 0	$ 0	$ 0
Average depreciation rate	2.68%	2.68%	2.69%
Impairment of Long-Lived Assets Held-for-use	$ 0	$ 0	$ 0
Public Utilities, Allowance for Funds Used During Construction, Rate	7.60%	7.70%	7.70%
Investment tax credit, percent	3.00%
Marysville Hydro Partners
Significant Accounting Policies
Variable Interest Entity Ownership Percentage of Partner	50.00%
Utility plant in service - net	$ 19,000
Variable interest entity consolidated intercompany long term debt	$ 12,000
Ida-West Energy
Significant Accounting Policies
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Bridger Coal Company
Significant Accounting Policies
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net	$ 95,000
Idaho Power Company
Significant Accounting Policies
Utility plant in service - net	3,571,537	$ 3,407,201
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 73,000
IDACORP Financial Services Limited Partnership Interests
Significant Accounting Policies
Variable interest entities ownership percentage minimum	5.00%
Variable interest entities ownership percentage maximum	99.00%
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net	$ 10,000
Asset exchange [Member]
Significant Accounting Policies
Noncash transactions	44,000
Long Term Service Agreement [Member]
Significant Accounting Policies
Noncash transactions	$ 22,000