Storage to suit remote sites such as islands, fringe of grid and off-grid

February 18, 2019 11:28 am Published by Leave your thoughts

In Australia, there are many remote sites which are located in “fringe of grid” and “off grid”. In the AEMC report (*) for Western Power proposal dated 19th December 2017, Western Power stated many benefits when allowing distributors to provide electricity to customers (mostly in fringe of grid) from off-grid systems (usually by a combination of solar power, energy storage batteries and a diesel generator) as a distribution service.

These include:

・ Least cost investment: Western Power’s modelling identifies an estimated 2,702 candidates for individual power systems on its network next ten years, resulting in a net benefit of $388 million (over 50 years) compared to the cost of replacing existing network assets
・ More efficient network investments: allowing off-grid options would enable better targeting of costs, especially on feeders with modest or low growth
・ Reliability: Individual power systems may present a more reliable supply of electricity than poles and wires, particularly in bush-fire prone areas
・ Safety: Individual power systems are less prone to external risks such as fire, wind and lightning
・ Improved aesthetics and practicalities associated with maintaining and preserving land

The battery storage system which is developed by a Japanese ceramic manufacturing company “NGK Insulators, Ltd.” has high potential to contribute to the idea proposed by Western Power. The battery storage uses sodium (Na) in negative electrode and sulfur (S) in positive electrode, so it is called NAS® battery system.

Since 2002, NGK Insulators, Ltd. have delivered NAS® battery system to about 200 locations worldwide with total output of more than 560 MW and storage capacity of 4000 MWh. Its long term experience in utility scale battery storage industry makes the system highly reliable.

One example which can be a reference to show its outstanding performance is 50 MW/300 MWh NAS® battery system in Kyusyu Island in Japan. In the Island, huge amounts of solar power had been installed and solar power generation is expected to exceed the power demand especially during the daytime of spring and autumn when power demand is low. NAS® battery system has been playing an important role in this Island and optimizing the balance of supply and demand of power by absorbing excess solar power to avoid limiting output from solar power generation.

One of the most unique features for NAS® battery system is “large capacity” which enables long hour discharge. It even makes 24/7 power supply possible when it operates with renewable generation such as solar power. This feature can be made best use of applications in remote sites such as islands, fringe of grid and off-grid.

Thanks to its outstanding technology developed by Japanese craftsmanship, it is expected that NAS® battery system contributes optimum use of renewable power generation in Australia.

For further details, please contact Shotaro Tsuyumu, NGK Stanger Pty Ltd
Email :, Phone : +61(0)3 9401 6215 / +61 (0)439320240

NAS, the NAS logo are trademarks of NGK INSULATORS,LTD., registered in the U.S.

(*) National Electricity Amendment (Alternatives to grid-supplied network services) Rule 2017, 19 December, 2017