Energy Vault has 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 will work with an undisclosed partner to jointly develop the integrated, off-grid power systems in a deal worth around $500-$600 million.

The agreement, announced on August 7, includes establishing a repeatable AI power infrastructure platform that combines dispatchable power generation, intelligent BESS, grid-forming inverter systems and advanced AI infrastructure controls software.

Initial deployments are expected over the next four to 12 months.

Energy Vault said the companies will create fully integrated, off-grid power systems capable of bringing AI computing capacity online significantly faster than traditional utility interconnection schedules — while providing the reliability, resiliency and operational flexibility required by next-generation AI workloads.

The integrated model continuously orchestrates and optimises the generation, battery storage, power conversion, redundancy systems and electrical infrastructure as a single intelligent power plant.

Energy Vault said the companies are also set to take on additional, similar projects, targeting markets where constrained grid capacity, extended utility interconnection timelines and increasing electricity demand are driving the need for rapidly deployable behind-the-meter and bridge-power solutions.

“AI is fundamentally changing how critical power infrastructure is designed, deployed and operated,” said Energy Vault chairman and CEO Robert Piconi.

“As our largest single contract executed to date, this milestone agreement represents another important step in Energy Vault’s strategic evolution from an energy storage technology pioneer into an integrated energy infrastructure provider.”

Batteries International reported last January that Energy Vault had started building a 150MW/300MWh BESS in Texas, backed by $300 million from a preferred equity investment from Orion Infrastructure Capital.

The SOSA Energy Center, in Madison County, was originally developed by Savion, a subsidiary of Shell, and acquired by Energy Vault in the fourth quarter of 2025 under its ‘Asset Vault’ subsidiary — which is focused on developing, building and operating energy storage systems.