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Leases - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2023 MW
Lancaster Power Purchase Agreement [Member] |
Lessee, Lease, Description [Line Items] |
Evaluated Power Capacity | 270

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- Definition Evaluated Power Capacity + References No definition available. + Details
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Namespace Prefix: | ava_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | duration

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LeaseContractualTermAxis=ava_LancasterPowerPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |