Energy Vault has signed an agreement with Japan-based grid-scale BESS firm PowerX to consider energy storage and datacentre projects in the US, Japan and Australia.

Under the partnership, announced on November 5, the companies will explore the supply of up to 1.5GWh of PowerX’s Mega Power series products for deployment in the US in 2027.

The series comprises three product lines: Mega Power, a containerised BESS; Grid Connector, an all-in-one grid connection package integrating a power conversion system, transformer and switchgear; and Mega Power DC, a scalable modular data centre with built-in large-scale BESS.

PowerX said all systems would be manufactured at its factory in Japan and were designed to meet foreign entity of concern requirements under US law that apply to energy storage projects seeking federal clean energy tax credits.

Demand for energy storage in the US continues to grow, driven by the expansion of datacentres and the integration of renewable energy.

Beyond the US supply, both companies intend to collaborate on the development, financing, construction and operation of BESS and datacentre projects in international markets.

Energy Vault’s portfolio includes proprietary battery, gravity and green hydrogen energy storage technologies. B-Vault is marketed as a suite of fully-integrated lithium ion-based BESS systems designed for reliability, flexibility, and availability.

Earlier this year, Energy Vault agreed a deal to supply battery storage, grid-forming power conversion systems and AI infrastructure control software for a 1.25GW hyperscale datacentre project in Texas.

The company said it would work with an undisclosed partner to jointly develop the integrated, off-grid power systems in a deal worth around $500 million-$600 million.