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Balance Sheet Components - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | $ 115,197 | $ 146,327
Regulatory Assets, Non-Current | 867,242 | 894,168
Regulatory Liabilities, Current | 92,195 | 76,007
Regulatory Liabilities, Non-Current | 840,047 | 856,666
Other Income Tax Related Liabilities [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 8,918 | 25,129
Regulatory Liabilities, Non-Current | 53,859 | 56,582
Excess Deferred Income Taxes [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 14,223 | 14,510
Regulatory Liabilities, Non-Current | 282,629 | 293,029
Deferred Climate Commitment Act Revenues [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 32,947 | 0
Regulatory Liabilities, Non-Current | 14,296 | 37,231
Deferred Power Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 7,172 | 0
Regulatory Liabilities, Non-Current | 5,312 | 4,000
Deferred Natural Gas Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 13,213 | 9,296
Regulatory Liabilities, Non-Current | 0 | 0
Decoupling Rebate [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 7,495 | 18,680
Regulatory Liabilities, Non-Current | 3,150 | 6,344
Utility Plant Retirement Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 439,874 | 417,027
Interest Rate Swaps [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 23,580 | 23,752
COVID-19 Deferrals [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 10,443 | 10,172
Other Regulatory Liabilities [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 8,227 | 8,392
Regulatory Liabilities, Non-Current | 6,904 | 8,529
Energy Commodity Derivatives [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 38,033 | 51,419
Regulatory Assets, Non-Current | 12,708 | 17,720
Deferred Climate Commitment Act Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 36,102 | 0
Regulatory Assets, Non-Current | 21,834 | 46,022
Deferred Power Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 13,410 | 29,190
Regulatory Assets, Non-Current | 22,724 | 20,654
Wildfire Resiliency [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 8,277 | 0
Regulatory Assets, Non-Current | 14,312 | 23,737
Decoupling Surcharge [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 10,476 | 4,638
Regulatory Assets, Non-Current | 8,123 | 5,469
Deferred Natural Gas Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 3,376 | 60,667
Regulatory Assets, Non-Current | 0 | 0
Income Tax Related Assets [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 246,863 | 244,303
Pension and Other Postretirement Benefit Plans [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 111,844 | 117,658
Interest Rate Swaps [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 174,151 | 179,489
AFUDC Above FERC Allowed Rate [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 48,232 | 49,985
Settlement with Coeur d'Alene Tribe [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 35,855 | 36,692
Advanced Meter Infrastructure [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 27,069 | 29,345
Utility Plant Abandoned [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 31,610 | 38,274
Colstrip Excess Depreciation [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 23,824 | 19,429
COVID-19 Deferrals [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 11,846 | 12,142
Demand Side Management Programs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 27,496 | 10,033
Other Regulatory Assets [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 5,523 | 413
Regulatory Assets, Non-Current | $ 48,751 | $ 43,216

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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