---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-23-028207"
form_type: "8-K"
ticker: "GWH"
cik: "0001819438"
company_name: "ESS Tech, Inc."
filed_at: "2023-08-08T23:59:59+00:00"
generated_at: "2026-06-12T02:36:53.975219+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# ESS Tech Q2 revenue $2.8M record; ships 9 Energy Warehouses to 4 new customers

## Summary
- Record Q2 revenue $2.8M; shipped 9 Energy Warehouses to 4 new customers.
- Partnership with LEAG for 500 MWh iron flow battery system at Boxberg, Germany; definitive agreements expected Q3.
- SMUD agreement: up to 2 GWh LDES over four years; first phase shipments begun.
- Management expects revenue for next two quarters at approximately Q2 rate.
- UL 9540 certification received; 10 new patents granted (total 70 patents, 235 filed).

## SEC filing metadata
- accession: 0001628280-23-028207
- form_type: 8-K
- ticker: GWH
- cik: 0001819438
- company_name: ESS Tech, Inc.
- filed_at: 2023-08-08T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819438/000162828023028207/0001628280-23-028207-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819438/000162828023028207/wk-20230808.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-23-028207
- JSON: https://secwatch.observer/filing/0001628280-23-028207.json
- Plain text: https://secwatch.observer/filing/0001628280-23-028207.txt

## Key facts
- Earnings Releases
  ESS Tech, Inc. reported the quarter ended June 30, 2023 results: revenue $2.8 million.
  - Period: the quarter ended June 30, 2023
  - Revenue: $2.8 million
  - Result: reported results
  source text: as expressly set forth by specific reference in such a filing. --- EX-99.1 (EX-99.1) --- ESS Tech, Inc. Announces Second Quarter 2023 Financial Results Record Revenue of $2.8 Million Delivered Energy WarehousesTM to Four New Customers Announces Partnership with LEAG WILSONVILLE, Ore. – August 8, 2023 – ESS Tech, Inc . (“ESS,” “ESS, Inc.” or the “Company”) (
  evidence_url: https://www.sec.gov/Archives/edgar/data/1819438/000162828023028207/0001628280-23-028207-index.htm
- Earnings Releases
  ESS Tech, Inc. reported the second quarter ended June 30, 2023 results: revenue $2.8 million.
  - Period: the second quarter ended June 30, 2023
  - Revenue: $2.8 million
  - Result: reported results
  source text: today announced financial results for its second quarter ended June 30, 2023. “I’m proud of the progress ESS made in the second quarter, recognizing record revenue of $2.8 million
  evidence_url: https://www.sec.gov/Archives/edgar/data/1819438/000162828023028207/0001628280-23-028207-index.htm

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