{"filing":{"accession_number":"0001637880-26-000030","cik":"0001637880","ticker":null,"company_name":"Tri-State Generation \u0026 Transmission Association, Inc.","form":"8-K","filing_date":"2026-05-28","report_date":null,"primary_document":"tris-20260527.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1637880/000163788026000030/tris-20260527.htm"},"events":[{"id":8586,"run_id":7537,"accession_number":"0001637880-26-000030","anchor_item_number":"7.01","event_type":"other_material","event_domain":"catchall","is_material":true,"confidence":0.72,"summary":"Midwest Electric Cooperative Corporation provided a non-conditional two-year notice of intent to withdraw from Tri-State membership effective June 1, 2028, which represents a material loss of a utility member accounting for 1.9% of utility member revenue and 1.3% of operating revenue for 2025. While this disclosure does not fit neatly into the standard M\u0026A taxonomy (it is not a traditional acquisition, disposition, or change of control), the withdrawal of a significant member with contractual and regulatory implications is material to investors' assessment of Tri-State's business and revenue base.","company_name":"Tri-State Generation \u0026 Transmission Association, Inc.","ticker":null,"filing_date":"2026-05-28","form":"8-K","submitted_at":null,"items":[{"id":2520,"accession_number":"0001637880-26-000030","item_number":"7.01","item_title":"Regulation FD Disclosure.","event_type":"other_material","event_domain":"catchall","is_material":true,"confidence":0.72,"reasoning":"Midwest Electric Cooperative Corporation provided a non-conditional two-year notice of intent to withdraw from Tri-State membership effective June 1, 2028, which represents a material loss of a utility member accounting for 1.9% of utility member revenue and 1.3% of operating revenue for 2025. While this disclosure does not fit neatly into the standard M\u0026A taxonomy (it is not a traditional acquisition, disposition, or change of control), the withdrawal of a significant member with contractual and regulatory implications is material to investors' assessment of Tri-State's business and revenue base.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-29T03:07:05.792556+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":2520,"accession_number":"0001637880-26-000030","item_number":"7.01","item_title":"Regulation FD Disclosure.","event_type":"other_material","event_domain":"catchall","is_material":true,"confidence":0.72,"reasoning":"Midwest Electric Cooperative Corporation provided a non-conditional two-year notice of intent to withdraw from Tri-State membership effective June 1, 2028, which represents a material loss of a utility member accounting for 1.9% of utility member revenue and 1.3% of operating revenue for 2025. While this disclosure does not fit neatly into the standard M\u0026A taxonomy (it is not a traditional acquisition, disposition, or change of control), the withdrawal of a significant member with contractual and regulatory implications is material to investors' assessment of Tri-State's business and revenue base.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-29T03:07:05.792556+00:00","company_name":"Tri-State Generation \u0026 Transmission Association, Inc.","ticker":null,"filing_date":"2026-05-28"}]}