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NAS Batteries (Sales Discontinued)

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Notice Regarding Discontinuation of Manufacturing and Sales Activities of NAS Batteries

NGK INSULATORS, LTD. hereby announces that, at the Board of Directors meeting held on October 31, 2025, it has resolved to discontinue the manufacturing and sales activities of NAS batteries under its Energy Storage Business.

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Overview

NAS batteries are manufactured by NGK. The batteries feature high capacity, high energy density, long life, and compact dimensions one-third those of lead batteries, enabling stable power supply for extended periods. NAS batteries make it possible to implement peak load shaving and load balancing and help stabilize renewable energy output , thereby contributing to power-saving measures, cutting energy costs, and reducing environmental impact.

NAS batteries have obtained the certification based on UL 1973 standard* (cell and module level) and a test report based on UL 9540A standard* (container type including cells and modules on mounted) .

* UL 1973 and UL 9540A standard is safety standard for stationary storage batteries issued by UL Solutions, a global independent safety science company.

About NAS Batteries NAS battery is a high-temperature rechargeable battery that uses sodium for the negative electrode and sulfur for the positive electrode. Learn more

Configurations A NAS battery system consists of battery enclosures, battery modules and a PCS (AC/DC power conversion system) as the main components. Learn more

Solutions NAS batteries that enable large-capacity power storage are playing active roles both of front and behind the meters. Learn more

Safety features

The safety of batteries is attracting attention. NAS batteries have been designed with safety as a top priority and have been improved and assured by field experience.

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