{"schema_version":"secwatch.filing_event.v1","accession":"0001537435-25-000134","form_type":"8-K","ticker":"TGEN","cik":"0001537435","company_name":"TECOGEN INC.","filed_at":"2025-09-04T23:59:59+00:00","discovered_at":"2026-05-14T18:02:44.271491+00:00","generated_at":"2026-05-17T08:17:18.074829+00:00","sec_items":["8.01"],"event_type":"other_material","sentiment":"positive","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"Tecogen prepays $1M in notes to director Hatsopoulos; eliminates all outstanding debt","bullets":["Prepaid two promissory notes to director John N. Hatsopoulos totaling $1M principal plus $76,955.62 interest.","October 2023 note ($500k, 5.12%) and July 2024 note ($500k, 5.06%) repaid on Sept 3 and 4, 2025.","Aggregate payment of $1,076,955.62 eliminated all outstanding debt of the Company.","Prepayment avoided approximately $46,159 in future interest charges through original maturity (July 31, 2026).","Audit Committee approved the prepayment under the Company's Related Person Transactions Policy."],"urls":{"canonical":"https://secwatch.observer/filing/0001537435-25-000134","json":"https://secwatch.observer/filing/0001537435-25-000134.json","markdown":"https://secwatch.observer/filing/0001537435-25-000134.md","text":"https://secwatch.observer/filing/0001537435-25-000134.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1537435/000153743525000134/0001537435-25-000134-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1537435/000153743525000134/tgen-20250902.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T08:17:18.074829+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"}