---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-25-047695"
form_type: "8-K"
ticker: "EOSE"
cik: "0001805077"
company_name: "Eos Energy Enterprises, Inc."
filed_at: "2025-10-31T23:59:59+00:00"
generated_at: "2026-05-17T01:08:21.035071+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Eos Energy secures 228 MWh order from Frontier Power, achieves Cerberus milestone

## Summary
- 228 MWh order for Z3 systems, first conversion under April 2025 5 GWh framework agreement.
- Frontier advanced 11 GWh of projects to Ofgem Cap-and-Floor program using Eos technology.
- Cerberus final cash receipt milestone satisfied; no additional preferred stock or warrants issued.
- Partnership aims to deploy long-duration storage across multiple international markets.
- Eos Z3 zinc-based BESS offers enhanced energy density and non-flammable safety for grid scale.

## SEC filing metadata
- accession: 0001628280-25-047695
- form_type: 8-K
- ticker: EOSE
- cik: 0001805077
- company_name: Eos Energy Enterprises, Inc.
- filed_at: 2025-10-31T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1805077/000162828025047695/0001628280-25-047695-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1805077/000162828025047695/eose-20251031.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-047695
- JSON: https://secwatch.observer/filing/0001628280-25-047695.json
- Plain text: https://secwatch.observer/filing/0001628280-25-047695.txt

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