The world’s largest sodium-ion battery energy storage system with a capacity of 4.75 GWh will be built.

Peak Energy signs multi-year sodium-ion storage supply deal with Jupiter Power

Peak Energy has signed a multi-year agreement with Jupiter Power, one of the leading U.S. developers and operators of large-scale energy storage, for the supply of up to 4.75 GWh of sodium-ion energy storage systems. The contract covers the period 2027–2030 and may exceed USD 500 million, marking a significant milestone for the sodium battery market.

The world’s largest sodium-ion project
In the first phase of the collaboration, Peak Energy will deliver around 720 MWh of storage capacity in 2027. According to the companies, this single delivery will be the largest announced sodium-ion battery deployment in grid applications globally to date.

Meanwhile, Jupiter Power has secured an option to reserve an additional 4 GWh of Peak Energy systems between 2028 and 2030. This allows both companies to scale the technology to the gigawatt-hour level in the latter half of the decade, responding to growing system flexibility needs driven by renewable energy, data centers, and AI applications.

Passive design with no active cooling
A key differentiator of Peak Energy’s system is its fully passive design, meaning the batteries do not require an active cooling system, which is standard in most large lithium-ion installations.

According to the company, this approach:

• Reduces energy consumption for system operation by up to 97%,
• Simplifies system architecture and improves safety,
• Reduces the number of components requiring regular maintenance.

Peak Energy also reports that their sodium-ion system exhibits about 30% better cell degradation performance over 20 years compared to many currently available lithium-ion solutions. In practice, this may limit or even eliminate the need for later “augmentation” — adding new battery modules to maintain the original storage capacity.

Fewer components associated with active cooling also translate into lower total operational and maintenance (O&M) costs over the system’s lifecycle.

Sodium as a technology for the AI and data center era
Peak Energy positions sodium-ion storage as a target technology for grid-scale applications.

At the same time, Jupiter Power emphasizes the strategic dimension of the collaboration — not only in cost terms but also for supply security. The company aims to increase the share of storage systems providing “firm, dispatchable energy”, i.e., controllable power available when the grid needs it most.

Supporting the domestic sodium-ion supply chain
The contract with Jupiter Power strengthens Peak Energy’s position as a scalable, “drop-in” supplier for U.S. storage projects, offering a competitive alternative to lithium-ion systems imported from Asia.

The agreement also aligns with a broader trend of developing a domestic sodium-ion energy storage supply chain — from cell manufacturing to system integration and deployment in U.S. grid projects.

If the planned deliveries are completed as scheduled, the United States could see the creation of the world’s largest portfolio of sodium-ion battery storage projects between 2027 and 2030, offering an alternative to today’s dominant lithium-ion technology.