Eos receives DOE loan for second battery production line
Battery manufacturer Eos Energy Enterprises Inc. has received an $87 million advance from the U.S. Department of Energy (DOE) to add a second production line at the firm’s Thorn Hill manufacturing facility in Warrendale, Pennsylvania.
The loan, acting as a first advance under the second tranche of its loan agreement with the DOE’s Office of Energy Dominance Financing, will support about 4 GWh of annual battery manufacturing capacity throughout western Pennsylvania. More specifically, the company says the funding will go toward its brand of zinc-based long-duration energy system (LDES) products.
“Loan funding from the Office of Energy Dominance Financing has been critical in scaling Eos,” says Alessandro Lagi, CFO 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.”
The new production line is already up and running as of June 2026, Eos representatives say. The Pittsburgh-based company is currently ramping the new line toward its eventual capacity of about 2 GWh of batteries per year.
Revamping the Thorn Hill plant
Eos officials currently expect the company’s Thorn Hill manufacturing location to support about 4 GWh of annual production capacity across two lines. In order to do that, the company will be relocating its first production line to the plant from its Turtle Creek, Pennsylvania location, about 30 miles away.
By consolidating all manufacturing under one 432,000 square foot roof, Eos says it expects to cut corporate conversion costs by about 10-15%.
The move of the company’s primary production line from Turtle Creek to the Thorn Hill plant is still subject to lender approvals, the company says. However, COO John Mahaz says the manufacturing consolidation will make the firm’s entire operation run much more smoothly.
“Running two lines under one roof drives more efficient use of our engineering, support resources, and labor,” he notes. “This enables the operation to increase productivity and optimize manufacturing cost.”
Eos representatives expect to create jobs across four different shifts to staff the new production line. The DOE’s advance loan reimburses about 80% of eligible costs associated with the Thorn Hill plant, with Eos having drawn about $178 million of its DOE facility since 2024.
