---
schema_version: "secwatch.filing_event.v1"
accession: "0001805077-24-000002"
form_type: "8-K"
ticker: "EOSE"
cik: "0001805077"
company_name: "Eos Energy Enterprises, Inc."
filed_at: "2024-01-09T23:59:59+00:00"
generated_at: "2026-06-07T01:38:40.219475+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Eos Energy names TETRA preferred electrolyte supplier; TETRA to supply min 75% of demand

## Summary
- TETRA to supply 100% of Eos's zinc bromide (PureFlow) and 75% of proprietary electrolyte solution needs.
- Four-year agreement (through Dec 31, 2027) includes right of first refusal and non-exclusive license to electrolyte formula.
- No minimum purchase volumes required; pricing includes favorable cost-saving allocation mechanisms.
- Partnership supports Eos's U.S. supply chain and cost reduction goals for Z3 long-duration energy storage cube.
- Agreement expands existing relationship dating to 2021; TETRA investing in expanded bromine production.

## SEC filing metadata
- accession: 0001805077-24-000002
- form_type: 8-K
- ticker: EOSE
- cik: 0001805077
- company_name: Eos Energy Enterprises, Inc.
- filed_at: 2024-01-09T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1805077/000180507724000002/0001805077-24-000002-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1805077/000180507724000002/eose-20240108.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001805077-24-000002
- JSON: https://secwatch.observer/filing/0001805077-24-000002.json
- Plain text: https://secwatch.observer/filing/0001805077-24-000002.txt

## Key facts
- Material Agreements
  Eos Energy Enterprises, Inc. entered into Supply Agreement with TETRA Technologies, Inc. (effective 2024-01-08).
  - Action: entry
  - Agreement: supply
  - Counterparty: TETRA Technologies, Inc.
  - Effective: 2024-01-08
  source text: On January 8, 2024, HI-POWER, LLC (“Hi-Power”), a wholly-owned subsidiary of Eos Energy Enterprises, Inc. (“Eos”), entered into an Amended and Restated Manufacturing Purchase and Supply Agreement (the “Supply Agreement”) with TETRA Technologies, Inc. (“TETRA”), a Delaware corporation, to govern the provision of TETRA PureFlow® zinc bromide and the manufacturing and provision of Eos’s proprietary electrolyte solution (collectively, the “Products”) by TETRA to Eos.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1805077/000180507724000002/0001805077-24-000002-index.htm

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