NGK Insulators
Encyclopedia
is a Japanese
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

 ceramics company. It primarily produces insulators but also produces other products, especially ceramic products. It is listed on the Nikkei 225
Nikkei 225
The , more commonly called the Nikkei, the Nikkei index, or the Nikkei Stock Average , is a stock market index for the Tokyo Stock Exchange . It has been calculated daily by the Nihon Keizai Shimbun newspaper since 1950. It is a price-weighted average , and the components are reviewed once a year...

, which is an index of the Tokyo Stock Exchange
Tokyo Stock Exchange
The , called or TSE for short, is located in Tokyo, Japan and is the third largest stock exchange in the world by aggregate market capitalization of its listed companies...

. It is also listed in the Osaka Securities Exchange
Osaka Securities Exchange
is the second largest securities exchange in Japan, in terms of amount of business handled. As of 31 December 2007, the Osaka Securities Exchange had 477 listed companies with a combined market capitalization of $212 billion. The Nikkei 225 Futures, introduced at the Osaka Securities Exchange in...

, the Nagoya Stock Exchange
Nagoya Stock Exchange
Nagoya Stock Exchange is a stock trading market in Nagoya, Japan. It is Japan's third largest exchange, behind the Tokyo Stock Exchange and Osaka Securities Exchange.- History :...

, and the Sapporo Securities Exchange all under listing code 5333. NGK stands for Nippon (Japan) Gaishi (insulator) Kaisha (company).

Sodium-Sulfur Batteries

NGK Insulators is known-worldwide for the development of sodium-sulfur batteries
Sodium-sulfur battery
A sodium–sulfur battery or liquid metal battery is a type of molten metal battery constructed from sodium and sulfur . This type of battery has a high energy density, high efficiency of charge/discharge and long cycle life, and is fabricated from inexpensive materials...

 in cooperation with TEPCO. NGK's NaS battery systems are being used worldwide, primarily in Japan and the United States.

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. The "typical system" (as defined by NGK) is composed of 40 50-kW units for a total system capacity of 12,000 kWh.

NGK's systems are currently used in worldwide, both as grid storage and as a supplement to wind and solar installations. System capacities range from 1.5 to 34 MW.
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