XML 125 R90.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Property, Plant And Equipment - Schedule of Major Classifications of Property, Plant And Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
Construction work-in-progress (CWIP) and other | $ 205,405 | $ 175,767
Total | 7,371,985 | 6,985,564
Other Property | 280,543 | 263,639
Total | 7,389,803 | 7,001,958
Avista Utilities [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Total | 7,199,017 | 6,815,891
Common Plant | 740,339 | 712,609
Avista Utilities [Member] | Electricity [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Production | 1,494,371 | 1,457,497
Transmission | 945,624 | 862,987
Distribution | 2,093,937 | 1,978,868
Construction work-in-progress (CWIP) and other | 424,733 | 384,372
Total | 4,958,665 | 4,683,724
Avista Utilities [Member] | Natural Gas [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 1,356,477 | 1,282,563
Construction work-in-progress (CWIP) and other | 87,852 | 83,644
Total | 1,500,013 | 1,419,558
Natural gas underground storage | 55,684 | 53,351
Alaska Electric Light & Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Total | 172,968 | 169,673
Common Plant | 9,726 | 9,687
Alaska Electric Light & Power [Member] | Electricity [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Production | 106,094 | 105,076
Transmission | 22,691 | 22,419
Distribution | 27,138 | 25,814
Construction work-in-progress (CWIP) and other | 7,319 | 6,677
Total | 163,242 | 159,986
Corporate and Other [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Other Property | $ 17,818 | $ 16,394

X
- Definition Property Plant And Equipment Total + References No definition available. + Details
Name: | ava_PropertyPlantAndEquipmentTotal
Namespace Prefix: | ava_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investments, and noncurrent assets classified as other. + References No definition available. + Details
Name: | us-gaap_InvestmentsAndOtherNoncurrentAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_PropertyPlantAndEquipmentGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to regulated assets common to business units. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentCommon
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of construction work in progress in public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility distribution. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDistribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility transmission owned by public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmission
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 No definition available. + Details
Name: | us-gaap_PublicUtilityPropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ava_AvistaUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_NaturalGasUsRegulatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ava_AlaskaElectricLightPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |