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BENEFIT PLANS: Schedule Defined Benefit Plans Disclosures (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Employer contributions |  | $ 10,900,000 | $ 10,400,000 | $ 9,800,000
Noncurrent liabilities |  | (137,406,000) | (165,992,000) |
Less amount recorded as regulatory assets |  | 1,564,458,000 | 1,507,372,000 |
Pension Plan |  |  |  |
Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at January 1 |  | 998,166,000 | 1,028,016,000 |
Service cost |  | 31,774,000 | 33,992,000 | 29,843,000
Interest cost |  | 56,151,000 | 52,181,000 | 51,277,000
Actuarial (gain) loss |  | 5,237,000 | (65,972,000) |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment |  | 0 | 0 |
Benefits Paid |  | 52,309,000 | 50,051,000 |
Projected benefit obligation at December 31 |  | 1,039,019,000 | 998,166,000 | 1,028,016,000
Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value at January 1 |  | 951,142,000 | 917,513,000 |
Actual return (loss) on plan assets |  | 104,542,000 | 63,680,000 |
Employer contributions |  | 20,000,000 | 20,000,000 |
Benefits Paid |  | (52,309,000) | (50,051,000) |
Fair value at December 31 |  | 1,023,375,000 | 951,142,000 | 917,513,000
Funded status at end of year |  | (15,644,000) | (47,024,000) |
Other current liabilities |  | 0 | 0 |
Noncurrent liabilities |  | (15,644,000) | (47,024,000) |
Net amount recognized |  | (15,644,000) | (47,024,000) |
Net loss |  | 13,142,000 | 43,516,000 |
Prior service cost |  | 18,000 | 24,000 |
Subtotal |  | 13,160,000 | 43,540,000 |
Less amount recorded as regulatory assets | [1] | 13,160,000 | 43,540,000 |
Net amount recognized in accumulated other comprehensive income |  | 0 | 0 |
Accumulated benefit obligation |  | 895,190,000 | 863,705,000 |
Senior Management Security Plan |  |  |  |
Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at January 1 |  | 102,318,000 | 105,809,000 |
Service cost |  | 1,172,000 | 1,051,000 | 612,000
Interest cost |  | 5,640,000 | 5,332,000 | 5,322,000
Actuarial (gain) loss |  | 2,401,000 | (3,321,000) |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment |  | 7,000 | 15,000 |
Benefits Paid |  | 6,900,000 | 6,568,000 |
Projected benefit obligation at December 31 |  | 104,638,000 | 102,318,000 | 105,809,000
Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value at January 1 |  | 0 | 0 |
Actual return (loss) on plan assets |  | 0 | 0 |
Employer contributions |  | 0 | 0 |
Benefits Paid |  | 0 | 0 |
Fair value at December 31 |  | 0 | 0 | $ 0
Funded status at end of year |  | (104,638,000) | (102,318,000) |
Other current liabilities |  | (6,855,000) | (6,827,000) |
Noncurrent liabilities |  | (97,783,000) | (95,491,000) |
Net amount recognized |  | (104,638,000) | (102,318,000) |
Net loss |  | 18,154,000 | 16,442,000 |
Prior service cost |  | 1,780,000 | 1,995,000 |
Subtotal |  | 19,934,000 | 18,437,000 |
Less amount recorded as regulatory assets |  | 0 | 0 |
Net amount recognized in accumulated other comprehensive income |  | 19,934,000 | 18,437,000 |
Accumulated benefit obligation |  | $ 99,105,000 | $ 96,487,000 |
[1] | Changes in the funded status of the pension plan that would be recorded in AOCI for an unregulated entity are recorded as a regulatory asset for Idaho Power as Idaho Power believes it is probable that an amount equal to the regulatory asset will be collected through the setting of future rates.

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- Definition The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Amount is prior to the recording of a regulatory asset. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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