{"transactions":[{"id":873823,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-03-02T16:11:38.000Z","date":"2026-02-27","kind":"tax_withholding","planned":false,"acquired":false,"shares":7341,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":218047,"source":{"system":"sec-edgar","filing":"0001271670-26-000006","document":"wk-form4_1772485896.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000127167026000006/wk-form4_1772485896.xml","form_type":"4"}},{"id":873822,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-03-02T16:11:38.000Z","date":"2026-02-27","kind":"grant","planned":false,"acquired":true,"shares":20864,"price":68.45,"value":1428140.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired upon 12/31/25 vesting of performance units granted under the company's 2023 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Share price is the closing share price on 2/11/26, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":225388,"source":{"system":"sec-edgar","filing":"0001271670-26-000006","document":"wk-form4_1772485896.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000127167026000006/wk-form4_1772485896.xml","form_type":"4"}},{"id":881731,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-25T15:50:54.000Z","date":"2026-02-24","kind":"tax_withholding","planned":false,"acquired":false,"shares":60,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":204524,"source":{"system":"sec-edgar","filing":"0001271670-26-000004","document":"wk-form4_1772052652.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000127167026000004/wk-form4_1772052652.xml","form_type":"4"}},{"id":881730,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-25T15:50:54.000Z","date":"2026-02-24","kind":"grant","planned":false,"acquired":true,"shares":2587,"price":68.45,"value":177080.15,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Includes underlying deferred share units that are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F2","text":"Shares acquired upon 12/31/25 vesting of performance units granted under the company's 2020 Executive Retirement-Retention Plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/11/26, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":204584,"source":{"system":"sec-edgar","filing":"0001271670-26-000004","document":"wk-form4_1772052652.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000127167026000004/wk-form4_1772052652.xml","form_type":"4"}},{"id":932101,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-01-23T17:51:09.000Z","date":"2026-01-22","kind":"tax_withholding","planned":false,"acquired":false,"shares":2397,"price":64.54,"value":154702.38,"ownership":{"direct":true},"balance_after":201935,"source":{"system":"sec-edgar","filing":"0001271670-26-000002","document":"wk-form4_1769208665.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000127167026000002/wk-form4_1769208665.xml","form_type":"4"}},{"id":961914,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-12-19T15:07:08.000Z","date":"2025-12-19","kind":"tax_withholding","planned":false,"acquired":false,"shares":3129,"price":67.84,"value":212271.36,"ownership":{"direct":true},"balance_after":202884,"source":{"system":"sec-edgar","filing":"0001271670-25-000009","document":"wk-form4_1766174825.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000127167025000009/wk-form4_1766174825.xml","form_type":"4"}},{"id":1222015,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-03-05T15:08:04.000Z","date":"2025-03-03","kind":"grant","planned":false,"acquired":true,"shares":17334,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents restricted share units, subject to a three-year cliff vesting period, acquired upon grant of award under the company's 2025 Long-Term Incentive Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes deferred share units and shares acquired from participation in the company's Employee Stock Purchase Plan, Long-Term Incentive Plan, and through dividend reinvestment."}],"balance_after":200756,"source":{"system":"sec-edgar","filing":"0001993004-25-000041","document":"wk-form4_1741205277.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000199300425000041/wk-form4_1741205277.xml","form_type":"4"}},{"id":1222014,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-03-05T15:08:04.000Z","date":"2025-03-03","kind":"grant","planned":false,"acquired":true,"shares":7540,"price":54.12,"value":408064.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired upon 12/31/24 vesting of performance units granted under the company's 2022 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Share price is the closing share price on 2/12/25, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes deferred share units and shares acquired from participation in the company's Employee Stock Purchase Plan, Long-Term Incentive Plan, and through dividend reinvestment."}],"balance_after":183422,"source":{"system":"sec-edgar","filing":"0001993004-25-000041","document":"wk-form4_1741205277.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000199300425000041/wk-form4_1741205277.xml","form_type":"4"}},{"id":1576441,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2024-03-14T10:31:17.000Z","date":"2024-03-13","kind":"grant","planned":false,"acquired":true,"shares":17652,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted share units, subject to a three-year cliff vesting period, acquired upon grant of award under the company's 2024 Long-Term Incentive Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":169295,"source":{"system":"sec-edgar","filing":"0000073088-24-000047","document":"wk-form4_1710426668.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000007308824000047/wk-form4_1710426668.xml","form_type":"4"}},{"id":1591177,"issuer":{"id":4012,"kind":"organization","name":"NorthWestern Energy Group, Inc.","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2024-03-06T16:25:29.000Z","date":"2024-03-05","kind":"grant","planned":false,"acquired":true,"shares":2837,"price":46.7,"value":132487.9,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired upon 12/31/23 vesting of performance units granted under the company's 2021 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Share price is the closing share price on 2/14/24, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan, Long-Term Incentive Plan and through dividend reinvestment."}],"balance_after":151643,"source":{"system":"sec-edgar","filing":"0000073088-24-000026","document":"wk-form4_1709760314.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1271670/000007308824000026/wk-form4_1709760314.xml","form_type":"4"}},{"id":1962199,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-03-09T13:12:45.000Z","date":"2023-03-07","kind":"grant","acquired":true,"shares":9355,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted share units, subject to a three-year cliff vesting period, acquired upon grant of award under the company's 2023 Long-Term Incentive Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":142798,"source":{"system":"sec-edgar","filing":"0000073088-23-000068","document":"wf-form4_167838555470407.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308823000068/wf-form4_167838555470407.xml","form_type":"4"}},{"id":1967684,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-03-07T13:48:55.000Z","date":"2023-03-03","kind":"grant","acquired":true,"shares":894,"price":56.92,"value":50886.48,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"Shares acquired upon 12/31/22 vesting of performance units granted under the company's 2020 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/16/2023, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":133443,"source":{"system":"sec-edgar","filing":"0000073088-23-000046","document":"wf-form4_167821492141537.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308823000046/wf-form4_167821492141537.xml","form_type":"4"}},{"id":1967683,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-03-07T13:48:55.000Z","date":"2023-03-03","kind":"grant","acquired":true,"shares":1982,"price":56.92,"value":112815.44,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Represents shares underlying deferred share units. The shares underlying deferred share units are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F2","text":"Shares acquired upon 12/31/22 vesting of performance units granted under the company's 2017 Executive Retirement-Retention Program."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/16/2023, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":132549,"source":{"system":"sec-edgar","filing":"0000073088-23-000046","document":"wf-form4_167821492141537.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308823000046/wf-form4_167821492141537.xml","form_type":"4"}},{"id":2085925,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock","published_at":"2022-12-15T18:36:07.000Z","date":"2022-12-13","kind":"grant","acquired":true,"shares":15905,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F3","text":"Restricted stock award of common stock, under the NorthWestern Corporation Amended and Restated Equity Compensation Plan. One half of the restricted stock award vests on December 12, 2025, and the other half vests on December 12, 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":129351,"source":{"system":"sec-edgar","filing":"0000073088-22-000176","document":"wf-form4_167114733772631.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308822000176/wf-form4_167114733772631.xml","form_type":"4"}},{"id":2085924,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock","published_at":"2022-12-15T18:36:07.000Z","date":"2022-12-13","kind":"grant","acquired":true,"shares":4927,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Represents the number of restricted share units, subject to a five-year cliff vesting period, acquired upon grant of award under the company's 2022 Executive Retirement-Retention Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":113446,"source":{"system":"sec-edgar","filing":"0000073088-22-000176","document":"wf-form4_167114733772631.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308822000176/wf-form4_167114733772631.xml","form_type":"4"}},{"id":2124970,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock","published_at":"2022-11-04T11:19:33.000Z","date":"2022-11-03","kind":"sale","acquired":false,"shares":6800,"price":52.51,"value":357068.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $52.46 to $52.61. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":108462,"source":{"system":"sec-edgar","filing":"0000073088-22-000148","document":"wf-form4_166757515809056.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308822000148/wf-form4_166757515809056.xml","form_type":"4"}},{"id":2363715,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock","published_at":"2022-03-02T18:05:28.000Z","date":"2022-02-28","kind":"grant","acquired":true,"shares":3894,"price":56.52,"value":220088.88,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired upon 12/31/21 vesting of performance units granted under the company's 2019 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Share price is the closing share price on 2/10/2022, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":111129,"source":{"system":"sec-edgar","filing":"0000073088-22-000071","document":"wf-form4_164626230334687.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308822000071/wf-form4_164626230334687.xml","form_type":"4"}},{"id":2373704,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock","published_at":"2022-02-25T12:22:08.000Z","date":"2022-02-24","kind":"grant","acquired":true,"shares":2198,"price":56.52,"value":124230.96,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Represents shares underlying deferred share units. The shares underlying deferred share units are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F2","text":"Shares acquired upon 12/31/21 vesting of performance units granted under the company's 2016 Executive Retirement-Retention Program."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/10/2022, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":107235,"source":{"system":"sec-edgar","filing":"0000073088-22-000033","document":"wf-form4_164580971408124.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308822000033/wf-form4_164580971408124.xml","form_type":"4"}},{"id":2831597,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock","published_at":"2021-02-26T17:28:31.000Z","date":"2021-02-24","kind":"grant","acquired":true,"shares":3952,"price":57.47,"value":227121.44,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"Shares acquired upon 12/31/20 vesting of performance units granted under the company's 2018 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/11/2021, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":100390,"source":{"system":"sec-edgar","filing":"0000073088-21-000055","document":"wf-form4_161437849000509.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308821000055/wf-form4_161437849000509.xml","form_type":"4"}},{"id":2831596,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and COO"}}],"security":"Common Stock","published_at":"2021-02-26T17:28:31.000Z","date":"2021-02-24","kind":"grant","acquired":true,"shares":2181,"price":57.47,"value":125342.07,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Represents shares underlying deferred share units. The shares underlying deferred share units are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F2","text":"Shares acquired upon 12/31/20 vesting of performance units granted under the company's 2015 Executive Retirement-Retention Program."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/11/2021, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":96439,"source":{"system":"sec-edgar","filing":"0000073088-21-000055","document":"wf-form4_161437849000509.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308821000055/wf-form4_161437849000509.xml","form_type":"4"}},{"id":3247915,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Common Stock","published_at":"2020-02-26T17:02:33.000Z","date":"2020-02-26","kind":"grant","acquired":true,"shares":7896,"price":77.46,"value":611624.16,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"Shares acquired upon 12/31/19 vesting of performance units granted under the company's 2017 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/12/2020, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":89824,"source":{"system":"sec-edgar","filing":"0000073088-20-000054","document":"wf-form4_158275453470727.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308820000054/wf-form4_158275453470727.xml","form_type":"4"}},{"id":3247914,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Common Stock","published_at":"2020-02-26T17:02:33.000Z","date":"2020-02-24","kind":"grant","acquired":true,"shares":2054,"price":77.46,"value":159102.84,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Represents shares underlying deferred share units. The shares underlying deferred share units are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F2","text":"Shares acquired upon 12/31/19 vesting of performance units granted under the company's 2014 Executive Retirement-Retention Program."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/12/2020, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":81928,"source":{"system":"sec-edgar","filing":"0000073088-20-000054","document":"wf-form4_158275453470727.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308820000054/wf-form4_158275453470727.xml","form_type":"4"}},{"id":3630641,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Common Stock","published_at":"2019-02-27T12:32:23.000Z","date":"2019-02-25","kind":"grant","acquired":true,"shares":1191,"price":64.98,"value":77391.18,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F4","text":"Represents shares underlying deferred share units. The shares underlying deferred share units are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F5","text":"Shares acquired upon 12/31/18 vesting of performance units granted under the company's 2013 Executive Retirement-Retention Plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Share price is the closing share price on 2/11/19, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":77045,"source":{"system":"sec-edgar","filing":"0000073088-19-000039","document":"wf-form4_155128872925866.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308819000039/wf-form4_155128872925866.xml","form_type":"4"}},{"id":3630640,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Common Stock","published_at":"2019-02-27T12:32:23.000Z","date":"2019-02-25","kind":"grant","acquired":true,"shares":5677,"price":64.98,"value":368891.46,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired upon 12/31/18 vesting of performance units granted under the company's 2016 Long-Term Incentive Plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Share price is the closing share price on 2/11/19, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":75854,"source":{"system":"sec-edgar","filing":"0000073088-19-000039","document":"wf-form4_155128872925866.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308819000039/wf-form4_155128872925866.xml","form_type":"4"}},{"id":4002428,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP & CFO"}}],"security":"Common Stock","published_at":"2018-03-12T12:49:30.000Z","date":"2018-03-08","kind":"grant","acquired":true,"shares":47,"price":52.22,"value":2454.34,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Represents shares underlying deferred share units. The shares underlying deferred share units are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F2","text":"Shares acquired upon 12/31/17 vesting of performance units granted under the company's 2011 Executive Retirement-Retention Plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/12/18, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":67112,"source":{"system":"sec-edgar","filing":"0000073088-18-000078","document":"wf-form4_152087335637871.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308818000078/wf-form4_152087335637871.xml","form_type":"4"}},{"id":4029197,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP & CFO"}}],"security":"Common Stock","published_at":"2018-02-28T12:36:12.000Z","date":"2018-02-27","kind":"grant","acquired":true,"shares":2958,"price":52.22,"value":154466.76,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired upon 12/31/17 vesting of performance units granted under the company's 2015 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Share price is the closing share price on 2/12/18, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":67065,"source":{"system":"sec-edgar","filing":"0000073088-18-000064","document":"wf-form4_151983935232498.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308818000064/wf-form4_151983935232498.xml","form_type":"4"}},{"id":4035914,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP & CFO"}}],"security":"Common Stock","published_at":"2018-02-26T16:18:29.000Z","date":"2018-02-22","kind":"grant","acquired":true,"shares":1111,"price":52.22,"value":58016.42,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Represents shares underlying deferred share units. The shares underlying deferred share units are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F2","text":"Shares acquired upon 12/31/17 vesting of performance units granted under the company's 2011 Executive Retirement-Retention Plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Share price is the closing share price on 2/12/18, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":64107,"source":{"system":"sec-edgar","filing":"0000073088-18-000046","document":"wf-form4_151967989590797.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308818000046/wf-form4_151967989590797.xml","form_type":"4"}},{"id":4407763,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2017-03-03T17:28:03.000Z","date":"2017-03-01","kind":"grant","acquired":true,"shares":1117,"price":5762,"value":6436154.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F4","text":"Represents shares underlying deferred share units. The shares underlying deferred share units are issuable subsequent to the reporting person's termination of service from the company."},{"field":"shares","element":"transactionShares","label":"F5","text":"Shares acquired upon 12/31/16 vesting of performance units granted under the company's 2011 Executive Retirement-Retention Plan."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"Share price is the closing share price on 2/17/17, the date when the company's Board of Directors approved payout and vesting of the award."}],"balance_after":60386,"source":{"system":"sec-edgar","filing":"0000073088-17-000054","document":"wf-form4_148858006693271.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308817000054/wf-form4_148858006693271.xml","form_type":"4"}},{"id":4407762,"issuer":{"id":112257,"kind":"organization","name":"NORTHWESTERN CORP","symbol":"NWE"},"owners":[{"id":63915,"kind":"person","name":"BIRD BRIAN B","position":1,"cik":"0001271670","reported_name":"BIRD BRIAN B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2017-03-03T17:28:03.000Z","date":"2017-03-01","kind":"grant","acquired":true,"shares":6800,"price":57.4,"value":390320.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired upon 12/31/16 vesting of performance units granted under the company's 2014 Long-Term Incentive Program."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Share price is the closing share price on 2/16/17, the date when the company's Board of Directors approved payout and vesting of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Total shares owned includes shares acquired from participation in the company's Employee Stock Purchase Plan and through dividend reinvestment."}],"balance_after":59269,"source":{"system":"sec-edgar","filing":"0000073088-17-000054","document":"wf-form4_148858006693271.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/73088/000007308817000054/wf-form4_148858006693271.xml","form_type":"4"}}]}