Energy Vault Expands into Japan with 850 MW Energy Storage Portfolio Acquisition

Strategic move establishes local presence in one of the world's fastest-growing energy storage markets

Apr. 9, 2026 at 3:42pm

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A clean, modern, isometric 3D digital illustration depicting a miniature, stylized energy storage facility with various modular components and equipment, representing Energy Vault's advanced technology and infrastructure being deployed in the Japanese market.Energy Vault's strategic expansion into Japan's rapidly growing energy storage market through a major portfolio acquisition aims to deliver flexible, reliable grid solutions to support the country's renewable energy transition.Westlake Village Today

Energy Vault Holdings, Inc., a global leader in sustainable, grid-scale energy storage and AI compute infrastructure solutions, has announced its formal entry into the Japanese market through the acquisition of a pipeline of 850 MW Battery Energy Storage System (BESS) projects from a leading domestic energy storage developer. The transaction includes the integration of an established team of local energy experts, positioning Energy Vault to capitalize on Japan's rapidly growing energy storage market driven by increasing grid constraints and renewable energy expansion.

Why it matters

Japan's energy storage market is one of the fastest-growing globally, with a projected 50%+ CAGR in BESS capacity, driven by the country's need for flexible, reliable energy solutions to support its transition to renewable energy and carbon-neutral goals. This acquisition establishes Energy Vault's immediate presence in Japan, allowing the company to leverage its proprietary technology and global expertise to deliver the critical energy storage capacity the Japanese grid requires.

The details

The acquired portfolio consists of 350 MW of advanced-stage BESS projects targeted to commence construction in H2 2027 and reach commercial operations beginning in H2 2028. The portfolio also includes 500 MW of early-stage BESS projects, providing a robust, multi-year growth pipeline. By combining Energy Vault's global integration, supply chain, and asset ownership expertise with the local development team's on-the-ground expertise in Japanese land rights, permitting, and utility interconnections, the company is uniquely positioned to accelerate the deployment of flexible energy storage capacity in Japan.

  • The 350 MW of advanced-stage BESS projects are targeted to commence construction in H2 2027 and reach commercial operations beginning in H2 2028.
  • The 500 MW of early-stage BESS projects provide a multi-year growth pipeline for Energy Vault in the Japanese market.

The players

Energy Vault Holdings, Inc.

A global leader in sustainable, grid-scale energy storage and AI compute infrastructure solutions.

Robert Piconi

Chairman and Chief Executive Officer of Energy Vault.

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What they’re saying

“Entering the Japanese market is a key component of our high growth markets expansion strategy and represents one of the most compelling energy storage growth opportunities globally.”

— Robert Piconi, Chairman and Chief Executive Officer of Energy Vault

“Despite being a highly developed economy, Japan's energy storage market remains significantly underpenetrated and is now entering a period of accelerated growth driven by renewable expansion and structural grid constraints.”

— Robert Piconi, Chairman and Chief Executive Officer of Energy Vault

What’s next

Energy Vault expects to leverage its new solutions in the high-growth AI Compute segments to further compound growth opportunities within the Japanese market and enhance delivery of predictable, high-margin, long-term revenue streams ahead of its previously stated growth targets.

The takeaway

This strategic acquisition establishes Energy Vault's immediate presence in Japan, one of the world's fastest-growing energy storage markets, allowing the company to capitalize on the country's increasing need for flexible, reliable energy solutions to support its transition to renewable energy and carbon-neutral goals.