SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Summary of Significant Accounting Policies Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies
Payments for (Proceeds from) Other Investing Activities	$ (1,587)	$ (4,472)	$ (5,340)
Other assets, noncurrent	61,028	62,882
Utility plant in service - net	$ 3,957,784	$ 3,893,075
Maturity period of short-term investments	90 days	90 days	90 days
Late Payment Fee Customer Billings	1.00%
Period of Time After Which Unpaid Accounts Are Deemed Late	30 days	30 days	30 days
Impairment of Receivables	$ 0	$ 0	$ 0
Average depreciation rate	2.87%	2.84%	2.90%
Impairment of Long-Lived Assets Held-for-use	$ 0	$ 0	$ 0
Public Utilities, Allowance for Funds Used During Construction, Rate	7.60%	7.60%	7.60%
Other Nonoperating Income (Expense)	$ 6,502	$ (2,867)	$ (2,109)
Marysville Hydro Partners
Significant Accounting Policies
Variable Interest Entity Ownership Percentage of Partner	50.00%
Utility plant in service - net	$ 18,000
Variable interest entity consolidated intercompany long term debt	$ 6,000
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	$ 40,700
Guarantor Obligations, Maximum Exposure, Undiscounted	175,000
Idaho Power Company
Significant Accounting Policies
Payments for (Proceeds from) Other Investing Activities	(4,117)	(4,320)	(5,176)
Other assets, noncurrent	56,330	58,284
Utility plant in service - net	3,957,784	3,893,075
Guarantor Obligations, Maximum Exposure, Undiscounted	58,300
Other Nonoperating Income (Expense)	$ 2,266	$ (5,851)	$ (4,756)
IDACORP Financial Services Limited Partnership Interests
Significant Accounting Policies
Variable interest entities ownership percentage minimum	4.00%
Variable interest entities ownership percentage maximum	99.00%
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net	$ 3,700

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

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

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

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Significant Accounting Policies [Line Items]

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

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

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Amount of noncurrent assets classified as other.

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Amount of income (expense) related to nonoperating activities, classified as other.

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Amount of cash (inflow) outflow from investing activities classified as other.

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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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Composite depreciation rate for public utility plants in service.

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Period end amount of total net PPE.

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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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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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