October 10, 2025: China-based Rept Battero Energy has signed a 3GWh BESS supply agreement with Energy Vault Holdings in the US.

Under the terms of the deal, announced on September 16, lithium ion battery developer Rept will deliver the BESS systems in 2026.

The companies also plan to expand their collaboration in the US, Australian and European markets.

Rept said the US deal builds on a cooperative relationship for three years, with a cumulative system supply volume to date exceeding 1.5GWh.

The collaboration will provide strong support for the large-scale application of renewable energy and the stable operation of energy systems, Rept said.

In a separate deal, confirmed on August 21, Rept partnered Turkey’s Teksan to develop commercial, industrial, and grid-scale energy storage projects.

Also in August, Energy Vault entered into an exclusivity agreement for a $300 million preferred equity investment to launch a subsidiary focused on developing, building and operating energy storage systems.

The proprietary battery, gravity and green hydrogen ESS company said the new Asset Vault subsidiary would accelerate 1.5GW of energy storage projects globally.

In 2023, Energy Vault said it would deploy five additional gravity energy storage systems in China, after breaking ground for its first such ‘EVx’ project in the country a year earlier in partnership with Atlas Renewable and China Tianying.