---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-23-005826"
form_type: "8-K"
ticker: "GWH"
cik: "0001819438"
company_name: "ESS Tech, Inc."
filed_at: "2023-03-01T23:59:59+00:00"
generated_at: "2026-06-18T18:40:26.786352+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "medium"
source: SEC EDGAR
---

# ESS Tech reports record Q4 unit deliveries; annual capacity reaches ~800 MWh

## Summary
- Delivered record 14 Energy Warehouses in Q4 2022.
- Annual production capacity reached nearly 800 MWh with new automated line.
- Signed agreements with Burbank Water & Power, Consumers Energy, Amsterdam Airport Schiphol, and Turlock Irrigation District.
- CEO cites supply chain challenges; plans more calculated scaling in 2023 to improve unit profitability.
- Financial results (revenue, net income) not included in the furnished press release excerpt.

## SEC filing metadata
- accession: 0001628280-23-005826
- form_type: 8-K
- ticker: GWH
- cik: 0001819438
- company_name: ESS Tech, Inc.
- filed_at: 2023-03-01T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: medium
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819438/000162828023005826/0001628280-23-005826-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819438/000162828023005826/wk-20230301.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-23-005826
- JSON: https://secwatch.observer/filing/0001628280-23-005826.json
- Plain text: https://secwatch.observer/filing/0001628280-23-005826.txt

## Key facts
- Earnings Releases
  ESS Tech, Inc. reported financial results for fourth quarter and full year ended December 31, 2022.
  - Period: fourth quarter and full year ended December 31, 2022
  - Result: reported results
  source text: ESS Tech, Inc. issued a press release announcing financial results for the quarter and year ended December 31, 2022.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1819438/000162828023005826/0001628280-23-005826-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.