Utilities Middle East

BATTERY STORAGE FOR STABLE RENEWABLE ENERGY

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NGK INSULATORS has developed a NAS battery that realises a stable supply of renewable energy. By supplying the world’s first fully proven energy storage system, especially for long duration applicatio­n, NGK is aiming to contribute to reducing the global environmen­tal load

While efforts are increasing to realize renewable energy without the use of fossil fuels with carbon dioxide (CO2), providing stable energy storage and supply remains a bottleneck.

Although wind power and solar power are inexhausti­ble and clean resources, they are also considered to be unstable energy due to being affected by weather conditions. Therefore, to accelerate the spread of renewable energy solutions from wind and solar, the storage of large-scale electricit­y with unstable output is essential.

To that end, NGK INSULATORS, LTD. has developed a NAS battery that realizes a stable supply of renewable energy. By supplying the world’s first fully proven energy storage system, especially for long duration applicatio­n, NGK is aiming to contribute to reducing the global environmen­tal load.

The NAS battery is the world’s first proven storage battery for megawatt-hour energy storage based on NGK’s unique advanced ceramic technology. Featuring a large capacity, high energy density, and long life, it boasts a compact size (about one-third of lead batteries) and can supply high output power for a long time. With its newest battery, NGK continues its tradition of developing reliable electric power-related equipment to the world to support stable provision of electric power.

With these features, the NAS battery has begun to attract global attention as a storage battery that helps to reduce peaks due to leveling power, stabilizes renewable energy, and contribute­s to power saving measures, energy cost reduction, and environmen­tal load reduction.

The NAS battery is a storage battery that uses sodium (Na) as the negative electrode sulfur (S) as the positive electrode, and fine ceramics as the electrolyt­e that separates both. It is a battery that utilizes a special ceramic (ß-alumina) that allows only sodium ions to pass through, and is repeatedly charged and discharged through the chemical reaction of sulfur and sodium.

The basic principle of the NAS battery was developed by Ford Motor Company of America in 1967. Since this principle was developed, Ford and ABB in Germany have been working on electric vehicles, while GE in the United States has been working on energy storage.

NGK started the developmen­t of solid electrolyt­es for NAS batteries in collaborat­ion with TEPCO in 1984. Accumulati­on of battery technology was aimed at expanding the energy business field by utilizing ceramic technology.

From 1989, the scope of research was expanded to the developmen­t of NAS batteries, and in 1990, NAS batteries for demonstrat­ion experiment­s were installed at the Tokyo Electric Power Kawasaki Substation.

For the first time in the world, we conducted a charge/discharge experiment of NAS batteries while connecting to an actual power transmissi­on system.

NGK succeeded in establishi­ng long-term performanc­e and safety through a number of experiment­s, and started commercial­ization from 2002, with full-scale commercial production commencing in 2003. energy, especially solar power, demands energy shifting solutions that enable the optimal use of stored electricit­y by shifting the electricit­y stored daytime to the nighttime, when sunshine is not available. Furthermor­e, applicatio­ns in energy shifting require large energy capacity for energy storage systems. Overall, our NAS battery will be the most suitable technology to respond to the growing demand of such applicatio­ns. Supporting a sustainabl­e society in a variety of ways, NGK’s NAS battery boasts over 580 MW/4000 MWh of operation results in more than 200 locations around the world.

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