{"schema_version":"secwatch.filing_event.v1","accession":"0001628280-23-016813","form_type":"8-K","ticker":"GWH","cik":"0001819438","company_name":"ESS Tech, Inc.","filed_at":"2023-05-09T23:59:59+00:00","discovered_at":"2026-05-14T18:03:40.835562+00:00","generated_at":"2026-06-15T09:47:23.017643+00:00","sec_items":["2.02","9.01"],"event_type":"earnings","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"low","headline":"ESS Tech Q1 2023 revenue impacted by project delays; partnership with Coldwell Solar","bullets":["Built nine Energy Warehouses in Q1, continuing production pace from Q4.","Project delays at a customer site limited shipments and revenue recognition in Q1.","Partnership with Coldwell Solar to install three Energy Warehouses for a microgrid in California, expected operational late 2023.","ESS LDES units received UL 1973 certification for stationary energy storage systems.","Total patents reached 62 worldwide as of March 31, 2023, with 225 applications filed."],"urls":{"canonical":"https://secwatch.observer/filing/0001628280-23-016813","json":"https://secwatch.observer/filing/0001628280-23-016813.json","markdown":"https://secwatch.observer/filing/0001628280-23-016813.md","text":"https://secwatch.observer/filing/0001628280-23-016813.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1819438/000162828023016813/0001628280-23-016813-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1819438/000162828023016813/wk-20230509.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-15T09:47:23.017643+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":[{"claim_id":"bca84efd1926507aae074624b71fa0c1999676c5","claim":"ESS Tech, Inc. reported financial results for first quarter of 2023 ended March 31, 2023.","evidence_excerpt":"On May 9, 2023 , ESS Tech, Inc. (the “Company”) issued a press release announcing financial results for the quarter ended March 31, 2023.","evidence_source":"SEC 8-K Item 2.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1819438/000162828023016813/0001628280-23-016813-index.htm","confidence":0.9,"family_label":"Earnings Releases","details":[{"label":"Period","value":"first quarter of 2023 ended March 31, 2023"},{"label":"Result","value":"reported results"}],"fact_type":"earnings_release"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}