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Nameplate Capacity

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Number of Windmills

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- Definition

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

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Purchase price of expected asset acquisition prior to consideration being transferred. Excludes business acquisition.

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Other - Narrative (Details)									6 Months Ended
Other - Narrative (Details)	Apr. 16, 2026 USD ($)	Apr. 15, 2026 USD ($)	Mar. 31, 2026 USD ($)	Mar. 30, 2026 USD ($)	Mar. 27, 2026 USD ($) Rate	Feb. 20, 2026 USD ($) MW	Aug. 30, 2024 USD ($)	Dec. 22, 2023 USD ($)	Jun. 30, 2026 USD ($) unit	Dec. 31, 2027 MW	Jun. 29, 2026 USD ($)	May 18, 2026 USD ($)	May 17, 2026 USD ($)	Dec. 31, 2025 USD ($)	Aug. 31, 2025 MW
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period									$ 0
Public Utilities, Property, Plant and Equipment, Construction Work in Progress									$ 1,406,939,000					$ 1,082,208,000
Colstrip Units 3 and 4 \| Colstrip Units 3 and 4
Debt Instrument [Line Items]
Ownership interest (percent)									25.00%
Colstrip Units 1 and 2 \| Colstrip Units 1 and 2
Debt Instrument [Line Items]
Ownership interest (percent)									50.00%
Working Capital Needs [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity												$ 800,000,000.0
Ratio of Indebtedness to Net Capital												0.675	0.65
7.000% Junior Subordinated Notes Due 2056 \| Junior Subordinated Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 450,000,000.0
Debt Instrument, Interest Rate, Stated Percentage \| Rate					7.00%
Debt Instrument, Basis Spread on Variable Rate \| Rate					2.961%
Deferred Interest Term					10 years
7.250% Junior Subordinated Notes Series B Due 2056 \| Junior Subordinated Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 450,000,000.0						$ 449,500,000
Debt Instrument, Interest Rate, Stated Percentage \| Rate					7.25%
Debt Instrument, Basis Spread on Variable Rate \| Rate					2.848%
Deferred Interest Term					10 years
Subsidiaries
Debt Instrument [Line Items]
Commercial Paper									$ 220,000,000.0
Restricted Cash									79,300,000
Public Utilities, Property, Plant and Equipment, Construction Work in Progress									$ 1,406,939,000					$ 1,082,208,000
Subsidiaries \| Appaloosa Solar Project
Debt Instrument [Line Items]
Asset Acquisition, Price of Acquisition, Expected							$ 266,800,000
Subsidiaries \| Beaver Creek 2 Wind Project
Debt Instrument [Line Items]
Number of Windmills \| unit									21
Asset Acquisition, Consideration Transferred				$ 80,100,000
Subsidiaries \| Battle Butte Solar Project
Debt Instrument [Line Items]
Asset Acquisition, Consideration Transferred						$ 60,000,000.0
Nameplate Capacity \| MW						178
Subsidiaries \| Beaver Creek Wind Project
Debt Instrument [Line Items]
Nameplate Capacity \| MW															248
Investment Tax Credit	$ 46,300,000	$ 51,700,000	$ 181,100,000
Subsidiaries \| Appaloosa Solar Project
Debt Instrument [Line Items]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress									$ 147,800,000
Subsidiaries \| Appaloosa Solar Project \| HQC Solar Holdings 1, LLC
Debt Instrument [Line Items]
Ownership percentage								100.00%
Subsidiaries \| Appaloosa Solar Project \| Forecast
Debt Instrument [Line Items]
Nameplate Capacity \| MW										142
Subsidiaries \| HQC Solar Holdings 1, LLC \| Appaloosa Solar Project
Debt Instrument [Line Items]
Asset Acquisition, Consideration Transferred								$ 20,300,000	18,600,000
Subsidiaries \| Working Capital Needs [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period									0
Line of Credit Facility, Current Borrowing Capacity												$ 1,000,000,000.0	$ 800,000,000.0
Subsidiaries \| Energy Hedging Activities \| Standby Letters of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									300,000,000.0
Line of Credit Facility, Current Borrowing Capacity									8,000,000.0
Subsidiaries \| Purchase Power Contract
Debt Instrument [Line Items]
Posted Collateral									0
Subsidiaries \| Purchase Power Contract \| ICE Margin
Debt Instrument [Line Items]
Posted Collateral									52,300,000
Subsidiaries \| Purchase Power Contract \| Standby Letters of Credit \| Purchase Power Contract 1
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity									55,000,000.0
Subsidiaries \| Purchase Power Contract \| Standby Letters of Credit \| Purchase Power Contract 3
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity									9,600,000
Subsidiaries \| Purchase Power Contract \| Standby Letters of Credit \| Funding Participant Contract
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity									13,400,000
Subsidiaries \| Purchase Power Contract \| Standby Letters of Credit \| Purchase Power Contract 2
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity									$ 11,900,000