Energy Vault Deal Puts Sodium-Ion in the Spotlight

A 1.5 GWh agreement between Energy Vault and Peak Energy highlights sodium-ion batteries as a potential storage option for the fast-growing AI data center market

10 Feb 2026

The rapid expansion of artificial intelligence infrastructure in the US is reshaping debates around electricity supply, as developers search for new ways to store and manage power for large data centres.

Energy Vault and Peak Energy have signed an agreement covering 1.5 gigawatt-hours of sodium-ion battery systems manufactured in the US. The companies said the initial deployments will focus on AI-oriented data centres, which many analysts view as one of the fastest-growing sources of electricity demand.

The deal highlights growing interest in alternatives to lithium-ion batteries, which dominate today’s energy storage market. Sodium-ion systems rely on more widely available materials, potentially reducing exposure to supply chain constraints and commodity price volatility that have affected lithium markets in recent years.

Developers and investors have increasingly cited such risks as part of broader project planning as power demand linked to AI computing rises. Utilities across the US are also reassessing grid reliability and flexibility requirements as new data centre capacity is added.

Energy Vault said the agreement could help lower costs through scaled deployment and domestic manufacturing. Projects using US-produced equipment may also qualify for federal incentives linked to local supply chains, improving the economic case for emerging storage technologies.

For Peak Energy, the partnership aligns with its focus on stationary battery storage for grid operators and industrial users. These applications tend to prioritise safety, durability and predictable performance over energy density, characteristics where sodium-ion batteries are often considered competitive.

However, the technology remains at an earlier stage of commercial deployment than lithium-ion systems and has yet to demonstrate comparable operating history at large scale.

Industry analysts say announcements such as the Energy Vault and Peak Energy agreement reflect broader experimentation within the energy sector as companies respond to rising electricity demand from digital infrastructure.

While sodium-ion batteries are widely viewed as promising, they remain an emerging option rather than a direct replacement for lithium-ion technology. Even so, the 1.5 gigawatt-hour deal suggests a growing willingness among developers to test alternative storage systems as AI-related energy needs expand.