Eos Energy Enterprises (NASDAQ: EOSE) announced the start of commercial production at its Thorn Hill manufacturing facility in Marshall Township, Pennsylvania, following the completion of Site Acceptance Testing for Battery Line 2.

The new line incorporates single-piece flow architecture, enhanced process redundancy, and automated pick-and-place gantry systems. Compared to Battery Line 1, the Thorn Hill layout reduces raw material travel by 86% and shortens overall production line length by 40%, according to the company.

Line 2 has begun producing commercial batteries, with subassemblies coming online in the early third quarter and full production targeted for the fourth quarter of 2026. The company said Line 1 surpassed its full-year 2025 production in the first 164 days of 2026.

Eos stated the launch advances its goal of reaching 4 GWh of annual manufacturing capacity by the end of 2026.

"Battery Line 2 demonstrates our ability to continuously improve as we scale," said John Mahaz, Chief Operating Officer of Eos. "It validates that our manufacturing system can be replicated and scaled with discipline."

On the demand side, Frontier Power USA holds a 2 GWh capacity reservation agreement with Eos and in May 2026 signed its first transaction to acquire a 480 MWh battery project portfolio in Texas. Frontier Power USA subsequently signed a strategic framework agreement with Stella Energy Solutions to advance a 2 GWh pipeline using Eos technology.

In the United Kingdom, Frontier Power Energy Holding Ltd acquired rights to the Ayr and Busby projects in Scotland, which are expected to utilize approximately 2.8 GWh of Eos Z3 Indensity systems under a framework agreement announced in April 2025. Those projects remain subject to customary development milestones, project-specific agreements, and closing conditions.