{"filing":{"accession_number":"0001171843-26-004113","cik":"0001144800","ticker":"TACPF","company_name":"TRANSALTA CORP","form":"6-K","filing_date":"2026-06-15","report_date":null,"primary_document":"f6k_061526.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1144800/000117184326004113/f6k_061526.htm"},"events":[{"id":12227,"run_id":10791,"accession_number":"0001171843-26-004113","anchor_item_number":"EX-99.1","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"summary":"The press release discloses a U.S. Department of Energy order mandating that TransAlta's Centralia Unit 2 remain available for operation for an additional 90 days through September 13, 2026. This is a regulatory directive affecting the operational status of a material asset. While not fitting a discrete named event type (not M\u0026A, not a workforce reduction, not litigation), it is clearly an operational/regulatory matter that would affect investor assessment of the company's generation capacity and compliance obligations. The materiality stems from the operational constraint imposed on a significant power generation facility.","company_name":"TRANSALTA CORP","ticker":"TACPF","filing_date":"2026-06-15","form":"6-K","submitted_at":null,"items":[{"id":9027,"accession_number":"0001171843-26-004113","item_number":"EX-99.1","item_title":"exh_991.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"The press release discloses a U.S. Department of Energy order mandating that TransAlta's Centralia Unit 2 remain available for operation for an additional 90 days through September 13, 2026. This is a regulatory directive affecting the operational status of a material asset. While not fitting a discrete named event type (not M\u0026A, not a workforce reduction, not litigation), it is clearly an operational/regulatory matter that would affect investor assessment of the company's generation capacity and compliance obligations. The materiality stems from the operational constraint imposed on a significant power generation facility.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-06-22T02:26:03.613932+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":9027,"accession_number":"0001171843-26-004113","item_number":"EX-99.1","item_title":"exh_991.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"The press release discloses a U.S. Department of Energy order mandating that TransAlta's Centralia Unit 2 remain available for operation for an additional 90 days through September 13, 2026. This is a regulatory directive affecting the operational status of a material asset. While not fitting a discrete named event type (not M\u0026A, not a workforce reduction, not litigation), it is clearly an operational/regulatory matter that would affect investor assessment of the company's generation capacity and compliance obligations. The materiality stems from the operational constraint imposed on a significant power generation facility.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-06-22T02:26:03.613932+00:00","company_name":"TRANSALTA CORP","ticker":"TACPF","filing_date":"2026-06-15"}]}