Achieving Japan’s Energy Independence with Made-in-Japan Power

Japan relies heavily on imports for its energy needs—nearly all of the oil, natural gas, coal, and uranium used for power generation come from overseas. This dependence creates significant risks for the country’s energy security and makes it one of the least energy self-sufficient nations in the OECD, with a self-sufficiency rate of only 12.6%.

Against this backdrop, true Made-in-Japan Power refers to renewable energy sources that can be generated domestically, such as solar, wind, hydro, geothermal, and biomass^※2. These resources are the key to securing Japan’s energy independence.

To support this transition, PowerX delivers advanced battery energy storage systems that transform variable renewable energy into dependable power. This ensures stability of supply, advances Japan’s energy independence, and reflects the uncompromising quality and safety of “Made in Japan.”

PowerX’s battery energy storage systems are manufactured at our in-house factory and partner facilities in Tamano City, Okayama Prefecture. These factories operate under a vertically integrated production model, covering everything from design and manufacturing to quality control, all under rigorous safety and quality standards.

By producing domestically, we ensure a stable supply of components, rapid response capabilities, and long-term support—delivering products that our customers can rely on with complete confidence.

About Power Base

PowerX’s battery energy storage systems are assembled using carefully selected components sourced from Japan and trusted partners across the global supply chain. Design, assembly, and quality control are all carried out in Japan to ensure the highest standards.

A battery energy storage system is more than just a collection of parts—it depends on the optimization of control systems and rigorous safety assurance. PowerX integrates each component into complete systems that are precisely engineered, thoroughly tested, and safe for long-term operation.

This commitment is why every PowerX system carries our “Made in Japan Promise”—delivering uncompromising quality and safety at every stage.

PowerX's battery energy storage systems use LFP (Lithium Iron Phosphate) batteries.

We source cells and modules from trusted partners that meet strict quality standards, while enforcing rigorous quality control across the supply chain.

However, the performance and safety of a battery system are not determined by the cells or modules alone. What matters most is how they are integrated, controlled, and managed as part of a complete system.

At PowerX, we maximize the potential of battery cells by developing proprietary control systems, assembling them at our factory in Japan, and conducting comprehensive safety testing. This allows us to deliver safe, high-quality storage systems.

We also maintain a system that enables rapid qualification and procurement of alternative cells or modules if supply changes become necessary, ensuring consistent product availability.

Looking ahead, as the use of grid-scale batteries expands, we believe proper lifecycle management is just as important as manufacturing. To this end, on October 28, 2024, we obtained nationwide certification under Japan’s Waste Management and Public Cleansing Act. This certification ensures that both our battery systems and their components are managed responsibly and safely across their entire lifecycle.

LFP batteries are a next-generation type of lithium-ion battery that combines high safety with long durability. In today’s energy storage market, they are recognized as one of the safest and longest-lasting battery chemistries. PowerX adopts LFP cells for its battery systems to deliver stable, reliable performance.

１．High Safety

●Low risk of thermal runaway

LFP batteries maintain stability even at high temperatures, significantly reducing the risk of fire or explosion compared to conventional lithium-ion batteries (such as NMC types). They remain safe even during overcharging or over-discharging, making them ideal for both residential and industrial storage applications.

●No harmful metals

LFP batteries do not use cobalt or nickel, which reduces environmental impact and avoids resource procurement risks. This makes long-term, sustainable supply more feasible.

２．Long Life & High Durability

●Extended charge/discharge cycles (6,000+ cycles)

LFP batteries degrade slowly and can achieve over 6,000 cycles. For example, even with daily charging and discharging, they can last more than 15 years—two to three times longer than many other lithium-ion chemistries.

●Resistant to deep discharge

Unlike many batteries that degrade when discharged to very low voltages, LFP batteries are highly resistant to deep discharge. This allows more electricity to be used effectively, improving the efficiency of the overall storage system.。

３．Stable Performance & Wide Temperature Tolerance

●Reliable in both high and low temperatures

LFP batteries operate stably even in high-temperature environments (above 50°C), with a low risk of thermal events, which helps reduce cooling costs. They also remain functional in low temperatures (around –20°C), ensuring reliable operation even in cold climates.

●Safer and more durable than NMC

Compared to NMC (Nickel Manganese Cobalt) batteries, LFP batteries have slightly lower energy density (storage capacity per weight). However, they excel in safety, longevity, and cost efficiency—making them an optimal choice for residential and industrial storage applications.

All control software for PowerX’s battery energy storage systems is developed in-house in Japan, and servers are hosted domestically as well.

Our systems comply with international security standards at every level, ensuring robust protection suitable for deployment in critical infrastructure.

At the corporate level, PowerX is also certified under ISMS/ISO 27001, and we are fully committed to comprehensive information management and security measures across the organization.

Battery cells have become commoditized, and PowerX's policy is to source from manufacturers that can consistently deliver the highest quality at stable and competitive costs. At present, we procure from leading Chinese cell makers, but since cells are standardized components, we can also switch to other qualified suppliers if needed.

The performance and safety of a battery system depend not on the cells or modules alone, but on how they are integrated, managed, and controlled. This is why PowerX designs and develops the full system architecture in-house in Japan, applying rigorous security measures to ensure reliability and safety.

The cell manufacturers we source from are among the global market leaders, with proven track records supplying automotive batteries to multiple global OEMs. When selecting suppliers, we evaluate not only pricing and supply capacity, but also their compliance with international safety testing and strict quality management standards. Through this careful selection process, PowerX ensures the consistency and safety of its products.

A stationary battery system requires more than just cells and modules to store electricity. It also depends on power conditioners (PCS) to regulate frequency and voltage, and computers and software to control the entire system. Effective system development therefore requires hardware and software to be designed together.

Because different cell chemistries (such as LFP in our case) and PCS specifications behave differently, software must be optimized to integrate them so that charging and discharging are performed efficiently and safely. In other words, system performance depends on how well hardware and software are designed to work in unison.

Many software developers lack expertise in hardware, while hardware manufacturers typically focus only on the cells themselves. This can make it difficult to achieve optimal system design and precise control. By contrast, PowerX designs the entire system in-house, enabling us to develop and operate battery systems that maximize the strengths of both hardware and software.

All of our battery systems use the same standardized cells, enabling bulk purchasing efficiencies through large-scale procurement. By automating our manufacturing processes wherever possible, we reduce production costs and sell at competitive prices.

In addition, unlike overseas manufacturers that must ship fully assembled stationary storage systems—often weighing more than 20 tons—we import components and complete final assembly in Japan. This significantly lowers transport costs, giving PowerX an advantage in overall competitiveness.

All products are subject to strict quality management standards, with multiple inspection steps carried out from manufacturing through shipment. Upon completion, each product undergoes functional verification and performance testing.Thanks to our fully integrated production system in Japan, we also guarantee product traceability and stable quality. Each unit comes with a warranty, and in the unlikely event of an issue, we are committed to providing a swift response.

To ensure customers can use our products with confidence, PowerX has established a comprehensive maintenance framework for post-installation support. Our proprietary remote monitoring and control system, PowerOS, continuously tracks system operations, detecting and responding to abnormalities at an early stage.

In addition, we work with partner companies nationwide to provide on-site inspections, component replacements, and field support quickly and reliably.

PowerX battery energy storage systems comply with international security standards at every level, ensuring robust protection even when deployed in critical infrastructure.

At the corporate level, we are certified under ISMS/ISO 27001 and have established comprehensive manuals and response protocols to handle potential incidents.

For product and system security, we adhere to IEC standards and implement advanced measures such as encryption and authentication across networks and devices—providing strong, reliable defense against cyber threats.

PowerX contributes to Japan’s long-term energy security by advancing the adoption of renewable energy—Japan’s most reliable domestic source—and by developing storage technologies that make this electricity available when needed. Since renewable output fluctuates with weather and other conditions, battery energy storage systems are essential for balancing supply and demand. By storing excess power and releasing it when required, they ensure a stable and dependable energy supply.

Japan’s energy self-sufficiency rate is only 12.6% (as of 2022), one of the lowest among OECD countries. The nation relies heavily on imported oil, gas, coal, and uranium, which exposes it to geopolitical risks, volatile global fuel prices, and supply chain disruptions. This dependency creates a fundamental challenge for Japan’s energy security. Expanding renewable energy and storage is therefore critical to reducing reliance on imports and building a more resilient, independent energy system.

Yes. PowerX’s battery systems are designed according to international standards and are adaptable to diverse grid conditions and regulatory frameworks. Our modular, cell-agnostic design enables flexible scaling from small facilities to grid-scale deployments. In addition, our proprietary software platform allows integration into different market structures, including energy trading, ancillary services, and behind-the-meter applications. While our immediate focus is on strengthening Japan’s domestic energy resilience, the same technology can be applied globally to accelerate renewable integration and energy independence.

Japan has introduced a range of policies to accelerate battery storage adoption as part of its decarbonization and energy security strategy. These include subsidies for large-scale stationary storage, financing support through the Green Innovation Fund, and new market rules that create revenue opportunities for storage in capacity markets, ancillary services, and energy trading.In addition to financial incentives, the government is placing increasing emphasis on the security, traceability, and control of battery systems as they become deeply integrated into the nation’s energy infrastructure. This creates a favorable environment for domestic suppliers like us, whose systems are designed, manufactured, and operated in Japan with rigorous quality and security standards.

We believe that improving Japan’s energy self-sufficiency is a bipartisan imperative that transcends party politics. Given Japan’s extremely low energy self-sufficiency rate of just 12.6%, expanding renewables is widely recognized as the only viable path to strengthen energy independence. For this reason, we see a high degree of political consistency in support of renewables, regardless of changes in government.