DOE Advances $87M to Reimburse Eos’s Pennsylvania Zinc-Battery Line

The U.S. Department of Energy (DOE) advanced $87 million to Eos Energy Enterprises for eligible costs tied to the second production line at the company’s Thorn Hill manufacturing facility in Warrendale, Pennsylvania. Issued through DOE’s Office of Energy Dominance Financing, the advance is the first draw under the second tranche of Eos’s existing loan agreement. The source reports that the facility reimburses 80% of eligible costs associated with the site. This is a financing milestone under an established federal loan facility—not a new contract solicitation or grant competition—and the source identifies no proposal deadline or open procurement action.

The financing supports domestic manufacturing of Eos’s zinc-based long-duration energy storage systems. Eos positions its zinc hybrid cathode chemistry as an alternative to lithium-ion batteries for stationary grid and industrial storage applications. Line 2 entered commercial production in June 2026 and is ramping toward approximately 2 gigawatt-hours (GWh) of annual manufacturing capacity. The advance reimburses eligible costs already incurred in building out the line, returning some invested capital to the company’s balance sheet rather than serving as an initial project award for future work.

Eos said it had drawn approximately $178 million under its DOE facility since 2024. Chief Financial Officer Alessandro Lagi stated: “Loan funding from the Office of Energy Dominance Financing has been critical in scaling Eos. This advance reimburses a significant portion of the investment we have already made in Line 2 and returns that capital to the balance sheet, giving us more room to invest in the business while maintaining a disciplined approach to growth.” The loan facility is structured as a multi-draw term loan, with at least two tranches and the option for up to four if the company elects and meets applicable conditions. Each tranche corresponds to production, maintenance and development, and operation of a production line to be funded with its proceeds.

For federal energy buyers, integrators, utilities, and contractors, the development is relevant as a domestic supply-chain and capacity signal—not as an immediate bid opportunity. Eos expects Thorn Hill could support approximately 4 GWh of annual capacity across two lines after a planned relocation of Line 1, subject to lender approvals. Line 1 currently operates at the company’s Turtle Creek site; the source says approximately 250 impacted employees, including approximately 205 union-represented employees, are expected to be offered an employment opportunity or work-location assignment at Thorn Hill Building 200 or the company’s corporate offices. Procurement teams tracking storage projects can monitor the production ramp and relocation progress when assessing potential future sourcing options, while treating capacity projections and lender-dependent plans as conditional rather than guaranteed supply.

• DOE’s $87 million advance reimburses eligible costs for Eos’s second zinc-battery production line at Thorn Hill in Warrendale, Pennsylvania.
• The advance was issued through the Office of Energy Dominance Financing under the second tranche of an existing DOE loan agreement; it is not a new solicitation.
• The source says the loan facility reimburses 80% of eligible costs associated with the Thorn Hill manufacturing facility.
• Eos has drawn approximately $178 million from its DOE facility since 2024, according to the source.
• Line 2 entered commercial production in June 2026 and is ramping toward approximately 2 GWh of annual capacity.
• Following a planned Line 1 relocation, subject to lender approvals, Eos expects Thorn Hill to support approximately 4 GWh of annual capacity across two lines.
• The planned relocation concerns Line 1 operations currently housed at the company’s Turtle Creek site; approximately 250 employees, including about 205 union-represented employees, are expected to receive employment or work-location offers described in the source.
• The loan is a multi-draw term facility with at least two tranches and the option for up to four, subject to conditions; tranches correspond to production-line activities including production, maintenance and development, and operation.
• Energy procurement teams and contractors can track the ramp as a potential domestic zinc-battery supply signal, but should not interpret the advance as an open bid, purchase order, or guaranteed capacity commitment.