On June 17, Eos Energy Enterprises rose 8.37% in regular trading, trading at $7.645/share, with turnover of $50.09 million. The rally was driven by a dual catalyst: the signing of a binding European supply agreement and the commencement of commercial operations on the company's second production line.

On the partnership front, Eos Energy announced a binding master supply agreement with Germany's CAPAC Energy, establishing an exclusive partnership across Germany, Austria, and Switzerland. The deal secures an initial capacity commitment of 750 MWh with a pathway to scale up to 2 GWh of deployments through 2031, marking the company's strategic entry into the European long-duration storage market.

Simultaneously, the company's Battery Line 2 at its Thorn Hill facility in Marshall Township, Pennsylvania, officially began commercial operations following site acceptance testing. The new line's layout reduces raw material travel by 86% and shortens production line length by 40%, significantly enhancing operating efficiency. With Line 1 already surpassing its full-year prior-year production within the first 164 days, Eos Energy is advancing toward its target of 4 GWh annual manufacturing capacity by year-end.

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