AI data center energy storage: Energy Vault and Peak Energy’s strategic partnership

In early February 2026, Energy Vault, a Swiss-headquartered specialist in grid-scale energy storage, and Peak Energy, the first U.S. manufacturer of sodium-ion battery systems, unveiled a strategic partnership. Together they’ll co-develop a dedicated, full-stack energy storage platform for AI data centers. The deal includes a definitive supply agreement for 1.5 GWh of Peak Energy’s U.S.-made sodium-ion batteries, all managed by Energy Vault’s proprietary Vault OS™. Here’s how this move could reshape AI power infrastructure, domestic supply chains and the next wave of battery applications.

Background: AI’s power crunch

As AI training and inference workloads balloon, data centers face highly volatile, peaky power demands that were never part of traditional grid planning. Conventional uninterruptible power supplies (UPS) and lithium-ion batteries suit relatively stable loads, but they struggle when compute clusters swing from idle to full throttle in seconds. Marco Terruzzin, Chief Revenue Officer at Energy Vault, notes that rapid AI growth is exposing fundamental limits in conventional power infrastructure. By pairing a storage chemistry built for cost-sensitive, high-cycle applications with an energy management platform designed for volatility, the partnership tackles this gap head on.

The partnership details

On February 9, 2026, the two companies signed both a development agreement to co-create the AI-focused platform and a binding supply agreement securing 1.5 GWh of sodium-ion battery capacity. Under the U.S. Inflation Reduction Act, systems built with these domestically manufactured batteries qualify for Domestic Content Investment Tax Credits—an economic boost that helps data center operators lower upfront costs. Energy Vault also gained exclusive channel-partner rights for Peak Energy’s technology in Australia and Japan, two high-value markets where grid constraints and cooling challenges are common.

How sodium-ion batteries fit

Sodium-ion chemistry works much like lithium-ion, but swaps lithium for abundant, inexpensive sodium. While its energy density currently matches lithium iron phosphate (LFP) more than high-nickel lithium formulations, sodium-ion brings safety and thermal stability to the table. That stability translates into fewer cooling demands—especially in hot data halls—and consistent performance in freezing environments. It also sidesteps supply-chain risks tied to cobalt or nickel. Peak Energy, founded in 2023 by veterans from Tesla, Enovix and Apple, claims this is the first large-scale U.S. manufacturing line for sodium-ion storage. By securing volume, they aim to drive per-unit costs below those of imported alternatives.

Vault OS™ and system integration

Managing a bank of batteries is only half the battle. Energy Vault’s Vault OS™ is a technology-agnostic platform that optimizes dispatch, extends asset life and maintains operational control. When integrated with Peak Energy’s sodium-ion modules, Vault OS™ can predict and smooth extreme load swings, ensuring compute clusters never miss a beat. The integrated design also simplifies electrical topology. Instead of separate UPS units, switchgear and battery enclosures, data centers can adopt a modular “powered shell” architecture that embeds storage directly in the facility’s power floor. The result? Lower equipment counts, less heat from legacy UPS systems and streamlined maintenance.

Economic and policy implications

The supply deal unlocks several policy advantages. By meeting U.S. domestic content thresholds, data centers can claim Investment Tax Credits and potentially reduce effective capital costs by up to 30% on storage equipment. That matters when AI operators are racing to expand capacity but facing stiff competition for grid interconnection slots. In practical terms, a simpler electrical design cuts engineering hours; fewer UPS units mean smaller cooling systems. This combination can shave millions from a large-scale deployment. For Moonshot-style AI projects, every percentage point of cost saving can tip the scale on feasibility.

Global and industry impacts

While China’s CATL and Changan Automobile plan to launch a sodium-ion electric car by mid-2026, the Energy Vault–Peak Energy tie-up signals the U.S. is vowing to diversify its battery ecosystem. Expanding sodium-ion manufacturing on home soil reduces reliance on foreign suppliers and raw-material chokepoints. Cold-weather regions—where lithium performance often degrades—stand to gain, too. And by embedding storage into data hall design, operators can lean on their backup systems for grid-stabilizing services during peak compute periods, offering an additional revenue stream. All told, we’re looking at a pragmatic step toward resilience, cost reduction and supply-chain security.

Looking ahead: EV and beyond

Industry analysts see a clear link between stationary and mobility markets: scale drives down costs for both. If Peak Energy ramps up U.S. output to meet a 1.5 GWh order, it could pave the way for sodium-ion traction packs in electric vehicles. That would mark a strategic shift: instead of relying solely on lithium chemistries, automakers could tap a homegrown alternative with proven cold-weather performance. Right now, it’s early days. But this initial offtake is precisely the kind of anchor customer that battery startups need to move from pilot runs to true mass production.

Conclusion: a step in AI infrastructure evolution

This partnership doesn’t promise a magic bullet, but it does tackle real challenges: volatile power draw, supply-chain risk and the cost crunch in AI data centers. By pairing Peak Energy’s sodium-ion modules with Energy Vault’s Vault OS™, operators get a simpler, safer power architecture that plays to each technology’s strengths. As AI demand accelerates, we’ll need every tool—economic incentives, smarter controls and chemistry diversity—to keep data centers humming. This deal is an example of incremental progress: not sensational, but grounded in practical benefits that we can track and measure.