| | | | | | | | | | | | | | | | | | | | | |
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| | <entity> |
| | | <identifier scheme="http://www.sec.gov/CIK"> 0000073088 </identifier> |
| | | </entity> |
| | <period> |
| | | <startDate> 2022-08-08 </startDate> |
| | | <endDate> 2022-08-08 </endDate> |
| | | </period> |
| | </context> |
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| <dei:DocumentPeriodEndDate contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF80L2ZyYWc6NTNiMWUwYWVjMDZlNGQxNDgzZDI5OWU3OGRlZmVmNDEvdGFibGU6MzljOTIyNGYxOGVkNGY3OWJhM2U4ZjJlODNhOGJjZjYvdGFibGVyYW5nZTozOWM5MjI0ZjE4ZWQ0Zjc5YmEzZThmMmU4M2E4YmNmNl80LTEtMS0xLTE1ODMwOA_4a7d8843-77b2-4719-9523-f31c3951c652"> 2022-08-08 </dei:DocumentPeriodEndDate> |
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| <dei:EntityRegistrantName contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGV4dHJlZ2lvbjo0YTg0MTVkYzAxODc0YTcxOTI5ZDJkNjFhNzY2YzIxY18xNTc5_c14eb52c-638e-4962-8006-7ca5162b412d"> NorthWestern Corporation </dei:EntityRegistrantName> |
| <dei:EntityIncorporationStateCountryCode contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6OTllMDBlYjczMDk0NGU2Zjk4ZTYzM2I1NjQ0MjU0NjkvdGFibGVyYW5nZTo5OWUwMGViNzMwOTQ0ZTZmOThlNjMzYjU2NDQyNTQ2OV8wLTAtMS0xLTE1ODMwOA_1309a6b4-94d5-406c-87cc-814a23f21287"> DE </dei:EntityIncorporationStateCountryCode> |
| <dei:EntityFileNumber contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6OTllMDBlYjczMDk0NGU2Zjk4ZTYzM2I1NjQ0MjU0NjkvdGFibGVyYW5nZTo5OWUwMGViNzMwOTQ0ZTZmOThlNjMzYjU2NDQyNTQ2OV8wLTMtMS0xLTE1ODMwOA_8ba4417a-4d38-4a63-b724-e149c033e432"> 1-10499 </dei:EntityFileNumber> |
| <dei:EntityTaxIdentificationNumber contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6OTllMDBlYjczMDk0NGU2Zjk4ZTYzM2I1NjQ0MjU0NjkvdGFibGVyYW5nZTo5OWUwMGViNzMwOTQ0ZTZmOThlNjMzYjU2NDQyNTQ2OV8wLTQtMS0xLTE1ODMwOA_61ec0190-7ea9-4f0d-ab33-3e69733d4647"> 46-0172280 </dei:EntityTaxIdentificationNumber> |
| <dei:EntityAddressAddressLine1 contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6OTllMDBlYjczMDk0NGU2Zjk4ZTYzM2I1NjQ0MjU0NjkvdGFibGVyYW5nZTo5OWUwMGViNzMwOTQ0ZTZmOThlNjMzYjU2NDQyNTQ2OV8yLTAtMS0xLTE1ODMwOA_72bc4d5d-75e4-4caf-8512-1e0ddbe6eeef"> 3010 W. 69th Street </dei:EntityAddressAddressLine1> |
| <dei:EntityAddressCityOrTown contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6OTllMDBlYjczMDk0NGU2Zjk4ZTYzM2I1NjQ0MjU0NjkvdGFibGVyYW5nZTo5OWUwMGViNzMwOTQ0ZTZmOThlNjMzYjU2NDQyNTQ2OV8yLTEtMS0xLTE1ODMwOA_0d7b24a8-f571-4e7f-82fd-f85fa4ceca85"> Sioux Falls </dei:EntityAddressCityOrTown> |
| <dei:EntityAddressStateOrProvince contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6OTllMDBlYjczMDk0NGU2Zjk4ZTYzM2I1NjQ0MjU0NjkvdGFibGVyYW5nZTo5OWUwMGViNzMwOTQ0ZTZmOThlNjMzYjU2NDQyNTQ2OV8yLTItMS0xLTE1ODMwOA_a8644034-1440-46db-8a58-70decbd23f9b"> SD </dei:EntityAddressStateOrProvince> |
| <dei:EntityAddressPostalZipCode contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6OTllMDBlYjczMDk0NGU2Zjk4ZTYzM2I1NjQ0MjU0NjkvdGFibGVyYW5nZTo5OWUwMGViNzMwOTQ0ZTZmOThlNjMzYjU2NDQyNTQ2OV8yLTQtMS0xLTE1ODMwOA_e25fb5c3-5104-4d7f-9740-dae5394cad05"> 57108 </dei:EntityAddressPostalZipCode> |
| <dei:CityAreaCode contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGV4dHJlZ2lvbjo0YTg0MTVkYzAxODc0YTcxOTI5ZDJkNjFhNzY2YzIxY18xNTgw_550cb662-fa0a-49e8-b888-715c28909e38"> 605 </dei:CityAreaCode> |
| <dei:LocalPhoneNumber contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGV4dHJlZ2lvbjo0YTg0MTVkYzAxODc0YTcxOTI5ZDJkNjFhNzY2YzIxY18xNTgx_8f8c21a0-4c78-4b6b-88a7-6d8acbe03783"> 978-2900 </dei:LocalPhoneNumber> |
| <dei:Security12bTitle contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6NjNhODhkZjJlMTcxNDUzY2I2NWUyYWU1NWZiNjYxMWYvdGFibGVyYW5nZTo2M2E4OGRmMmUxNzE0NTNjYjY1ZTJhZTU1ZmI2NjExZl8xLTAtMS0xLTE1ODMwOA_8390a86a-5d51-4d90-85b2-bd3bd43e3b7b"> Common stock </dei:Security12bTitle> |
| <dei:TradingSymbol contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6NjNhODhkZjJlMTcxNDUzY2I2NWUyYWU1NWZiNjYxMWYvdGFibGVyYW5nZTo2M2E4OGRmMmUxNzE0NTNjYjY1ZTJhZTU1ZmI2NjExZl8xLTEtMS0xLTE1ODMwOA_6c724585-1482-4190-9e50-a07d6f41a532"> NWE </dei:TradingSymbol> |
| <dei:SecurityExchangeName contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGFibGU6NjNhODhkZjJlMTcxNDUzY2I2NWUyYWU1NWZiNjYxMWYvdGFibGVyYW5nZTo2M2E4OGRmMmUxNzE0NTNjYjY1ZTJhZTU1ZmI2NjExZl8xLTItMS0xLTE1ODMwOA_be31342a-0ffc-4152-a81d-79dd358e7904"> NASDAQ </dei:SecurityExchangeName> |
| <dei:WrittenCommunications contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGV4dHJlZ2lvbjo0YTg0MTVkYzAxODc0YTcxOTI5ZDJkNjFhNzY2YzIxY18xNTgy_d43b4775-c3ca-4fcf-8147-f66bc6d15b85"> false </dei:WrittenCommunications> |
| <dei:SolicitingMaterial contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGV4dHJlZ2lvbjo0YTg0MTVkYzAxODc0YTcxOTI5ZDJkNjFhNzY2YzIxY18xNTgz_67feb1c0-2f5c-4136-923a-75411e93e8b2"> false </dei:SolicitingMaterial> |
| <dei:PreCommencementTenderOffer contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGV4dHJlZ2lvbjo0YTg0MTVkYzAxODc0YTcxOTI5ZDJkNjFhNzY2YzIxY18xNTg0_ed4d3034-a6bb-4a77-9e34-e2812a72d13d"> false </dei:PreCommencementTenderOffer> |
| <dei:PreCommencementIssuerTenderOffer contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGV4dHJlZ2lvbjo0YTg0MTVkYzAxODc0YTcxOTI5ZDJkNjFhNzY2YzIxY18xNTg1_3ff5c451-dbee-425b-a93a-3fe39e1ae774"> false </dei:PreCommencementIssuerTenderOffer> |
| <dei:EntityEmergingGrowthCompany contextRef="ic8a0b33921124f5d808424dc8d6d3899_D20220808-20220808" id="id3VybDovL2RvY3MudjEvZG9jOmIzOTRiMWQ2NDY1MTRmNTU4OWExNDk1NzUyZmJlODE0L3NlYzpiMzk0YjFkNjQ2NTE0ZjU1ODlhMTQ5NTc1MmZiZTgxNF8xL2ZyYWc6NGE4NDE1ZGMwMTg3NGE3MTkyOWQyZDYxYTc2NmMyMWMvdGV4dHJlZ2lvbjo0YTg0MTVkYzAxODc0YTcxOTI5ZDJkNjFhNzY2YzIxY18xNTg2_334c6316-55c5-4379-99eb-2b06c4bc393a"> false </dei:EntityEmergingGrowthCompany> |
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