Business Context and Reporting Period
Company: Eos Energy Enterprises, Inc. (NASDAQ: EOSE)
Filing Type: Form 10-K (Annual Report)
Period Ended: December 31, 2025
Business Overview: Eos designs, manufactures, and markets zinc-based battery energy storage systems (BESS) as a safe, non-flammable alternative to lithium-ion batteries. The company focuses on utility-scale, microgrid, and commercial/industrial applications. Key products include the Z3 battery module, the DawnOS software platform, and the Indensity architecture. Manufacturing is primarily conducted at a facility in Turtle Creek, Pennsylvania, with a second facility in Warrendale expected to become operational in 2026.
Key Financial Metrics
| Metric ($ in thousands) | 2025 | 2024 |
|---|---|---|
| Revenue | $114,203 | $15,606 |
| Cost of Goods Sold | $258,040 | $98,867 |
| Gross Profit (Loss) | $(143,837) | $(83,261) |
| Net Loss | $(969,647) | $(685,870) |
| Operating Cash Flow | $(211,190) | $(153,936) |
| Cash and Cash Equivalents (End of Period) | $567,992 | $74,292 |
| Total Debt (Principal Outstanding) | $939,476 | $395,535 |
| Working Capital | $564,940 | $(149,063) |
Note: Working Capital calculated as Total Current Assets ($708,480) minus Total Current Liabilities ($143,540) for 2025.
Material Changes vs. Prior Period
- Revenue Growth: Revenue increased 632% to $114.2 million, driven by increased production volumes, deliveries, and improved pricing. Two customers accounted for 51.5% and 18.8% of total revenue.
- Cost Structure: Cost of goods sold (COGS) rose 161% to $258.0 million, outpacing revenue due to higher manufacturing volumes, project execution costs, and warranty accruals. This resulted in a gross loss of $143.8 million.
- Net Loss Expansion: Net loss widened to $969.6 million from $685.9 million. Significant non-cash items contributed to this figure, including a $279.9 million loss on the change in fair value of warrants and a $63.5 million induced conversion expense.
- Liquidity Improvement: Cash and cash equivalents surged from $74.3 million to $568.0 million, bolstered by approximately $1.5 billion in capital raised during 2025 through equity offerings, convertible notes, and warrant exercises.
- Debt Profile: Total principal debt increased significantly to $939.5 million, reflecting the issuance of $600 million in November 2025 Convertible Notes and $50 million remaining from May 2025 Convertible Notes, alongside the full funding of the Delayed Draw Term Loan and draws on the DOE Loan Facility.
Guidance, Outlook, and Risks
Management Commentary and Outlook
- Going Concern: Management concluded there is no longer substantial doubt about the company's ability to continue as a going concern for the next twelve months, citing significant capital raised and compliance with liquidity covenants.
- Strategic Milestones: The company achieved all operational milestones for the $210.5 million Delayed Draw Term Loan (DDTL) and fully funded Tranche 1 ($90.9 million) of the DOE Loan Facility. The company is transitioning to the Z3 battery platform and has launched the DawnOS software platform.
- Market Expansion: Eos is targeting growth in long-duration energy storage (LDES) driven by AI and data center demand. New international markets were entered, including a framework agreement with Frontier Power Ltd. in the UK.
Risks and Contingencies
- Profitability: The company expects to continue incurring losses and negative operating cash flows in the foreseeable future as it scales production.
- Debt Covenants: While Minimum Consolidated Revenue and EBITDA covenants are deferred until March 31, 2027, the company must maintain Minimum Liquidity. Failure to meet covenants could trigger defaults.
- Regulatory Changes: The "One Big Beautiful Bill Act" (OBBBA) introduced new limitations on tax credits related to sourcing from prohibited foreign entities. The company currently anticipates no material impact but is monitoring guidance.
- Manufacturing Scale-up: Risks include delays, quality control issues, and the ability to reduce costs as production scales to meet demand.
- Dilution: Significant dilution is possible due to outstanding warrants, convertible notes, and preferred stock, with a substantial portion of shares subject to lock-up agreements expiring in June 2026.
Investor Verification Checklist
- Revenue Quality: Verify the concentration risk with two customers accounting for over 70% of revenue and the sustainability of the 632% revenue growth rate.
- Path to Profitability: Assess the timeline for gross margin improvement given the current gross loss of $143.8 million and the heavy reliance on government tax credits (PTC) to offset COGS.
- Debt Servicing: Review the terms of the $600 million November 2025 Convertible Notes and the $90.9 million DOE Loan Facility, specifically the interest rates, maturity dates, and cash settlement requirements for conversions.
- Capital Expenditures: Confirm the progress and cost of the Warrendale, PA facility expansion and the automation of the Turtle Creek line to ensure capacity targets (8 GWh by 2027) are achievable.
- Regulatory Compliance: Monitor the impact of the OBBBA on the company's eligibility for IRA tax credits and the domestic content bonus.