NGK Insulators, Ltd. (日本碍子株式会社, Nihon gaishi kabushikigaisha) is a Japanese ceramics company.

[5] NGK's NaS battery systems are being used worldwide, primarily in Japan and the United States.

[6] NGK Insulators markets its NaS batteries for use as grid storage (especially for use in conjunction with renewable energy sources such as wind and solar).

The battery systems can be used for both peak shaving, load leveling, emissions reductions, and as emergency power supplies.

[5] NGK's systems are currently used worldwide, both as grid storage and as a supplement to wind and solar installations.