Structure of NAS Energy Storage System

The Easiest Way to Achieve Multiple Megawatt-Hour Energy Storage System

The NAS battery system is designed to be easily able to expand the capacity as much as needed in one site or several separate sites. The scalability of NAS installation to many 10s or 100s of MW for durations of 6 to 7 hours is at a scale that can defer or eliminate some transmission, distribution and generation investments especially when used in association with variable renewables for a clean solution. (The current largest system at one site is 50MW, 300MWh.) The construction leadtime is significantly shorter than upgrading or building transmission/distribution lines or substations.

A NAS battery system consists of battery enclosures, battery modules and a PCS (AC/DC power conversion system) as the main components. The NGK scope is the battery enclosures and battery modules. NGK works with several PCS manufacturers to complete the battery system.
It is also suitable to install in severe weather conditions, because the battery enclosure and insulated battery modules can resist a wide range of environmental conditions and climate.

NAS Battery System

NAS Battery System

Container type unit

The NAS battery system is a "Plug and Play" design built around standard 20 foot ocean freight containers. The containerized design expedites transportation and installation and helps minimize installation costs.

Rated Output DC1,000kW (max. power)
DC5,800kWh (BOL)
Configuration Four container subunits,series connected.
A subunit includes six NAS modules, each rated at DC41.7kW and DC245kWh.
Dimension 6.1W x 5.6D x 5.5H (m)
Weight 86 tonnes
Conventional model of NAS battery
Typical Layout of NAS Battery Systems
  • NAS and the NAS logo are trademarks of NGK INSULATORS, LTD., registered in the U.S. and other countries

Released advanced type of NAS battery “NAS MODEL L24”


In June 2024, NGK released advanced type of conventional containerized NAS battery “NAS MODEL L24” for overseas market. *1

NAS MODEL L24 maintains the basic performance characteristics such as output and capacity, but achieved a significantly lower degradation rate of less than 1% per year thanks to reduced corrosion in battery cells. Another technical achievement is an improved thermal management in battery modules, which enables a longer continuous discharge. *2

These new features allow projects to be implemented with fewer number of NAS battery containers installed over project running time, and additionally lead to a reduction in maintenance, which leads to saving approx. 20% on the investment in battery storage system compared to the conventional design.

*1: For the domestic market in Japan, NAS MODEL L24 is planned to be released once conformance with the domestic regulations is completed.

*2: In the case of discharging at 200kW-dc per NAS MODEL L24 unit, the continuous discharging duration is 6 hours.

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