An $87 million first advance under the second tranche of a US Department of Energy loan reimburses 80% of eligible costs at Eos Energy Enterprises' Thorn Hill facility in Warrendale, Pennsylvania. Total drawings since 2024 now stand at about $178 million, and Line 2 is ramping toward about 2 GWh a year.
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Eos Energy Enterprises, a US-based manufacturer of zinc-based long-duration energy storage systems, has received an $87 million advance from the US Department of Energy's Office of Energy Dominance Financing (EDF). It is the first draw under the second tranche of the company's DOE loan and funds its Thorn Hill manufacturing facility in Warrendale, Pennsylvania.
The payment reimburses 80% of eligible costs tied to Thorn Hill. With it, Eos has drawn about $178 million from the DOE facility since 2024. Most of the money returns spending the company has already made on Line 2, its second production line at the site.
Line 2 started commercial production in June 2026. Eos is ramping it toward a designed output of about 2 GWh a year and plans to staff the line across four shifts as more shifts come online. The company also intends to move Line 1 to Thorn Hill, subject to lender approvals. Once that move is complete, Eos expects the site to support about 4 GWh of annual manufacturing capacity across the two lines.
"Loan funding from the Office of Energy Dominance Financing has been critical in scaling Eos," said Alessandro Lagi, Chief Financial Officer of 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."
"Running two lines under one roof drives more efficient use of our engineering, support resources, and labor," said John Mahaz, Chief Operating Officer of Eos. "This enables the operation to increase productivity and optimize manufacturing cost."
Eos is the maker of BESS built on its Znyth zinc chemistry, used in utility-scale, microgrid, commercial and industrial applications with discharge durations of 4 to 16+ hours.