{"schema_version":"secwatch.filing_event.v1","accession":"0001466593-26-000054","form_type":"8-K","ticker":"OTTR","cik":"0001466593","company_name":"Otter Tail Corp","filed_at":"2026-05-15T17:57:25+00:00","discovered_at":"2026-05-15T17:58:01.535132+00:00","generated_at":"2026-05-15T17:59:39.011237+00:00","sec_items":["8.01"],"event_type":"regulatory","sentiment":"neutral","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"Otter Tail files 2026 IRP with MN PUC; plans 50MW gas, 100MW wind, solar, battery","bullets":["Filed 2026 Integrated Resource Plan with Minnesota PUC; includes a 50MW natural gas plant expected in 2031 or 2032.","Two 50MW wind generation facilities planned for 2035 and 2040.","Ongoing projects: 50MW Solway Solar (2026), 295MW Abercrombie Solar (2028), 75MW battery storage.","Coyote Station coal plant to be designated AME starting June 1, 2026; to stop serving MN customers by Dec 31, 2031."],"urls":{"canonical":"https://secwatch.observer/filing/0001466593-26-000054","json":"https://secwatch.observer/filing/0001466593-26-000054.json","markdown":"https://secwatch.observer/filing/0001466593-26-000054.md","text":"https://secwatch.observer/filing/0001466593-26-000054.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1466593/000146659326000054/0001466593-26-000054-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1466593/000146659326000054/ottr-20260515.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-15T17:59:39.011237+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}