Taiwanese and South Korean Battery Makers Target Japan’s Grid-Scale Storage Market Amid China’s Limited Presence

Taiwanese and South Korean battery makers are positioning themselves to capture a growing share of Japan’s grid-scale energy storage business, taking advantage of a market gap created by the limited participation of Chinese suppliers.

At the center of the shift is Japan’s certification environment. In the grid storage segment—where batteries are integrated into systems that help stabilize the power network—suppliers are expected to meet local requirements, including cybersecurity-related standards. Chinese battery companies, major players globally, have struggled to secure the necessary cybersecurity certification in Japan, according to industry participants. That has effectively constrained their access to projects tied to the country’s electricity grid, opening room for competitors with fewer regulatory hurdles.

The opportunity has drawn interest from firms in Taiwan and South Korea, which see Japan as an attractive destination as the nation expands renewable power and seeks more flexibility on the grid. Grid-scale batteries can absorb surplus electricity—such as midday solar output—and dispatch it later when demand rises, improving reliability and reducing curtailment of renewables.

One Taiwanese company moving aggressively is Cold Electric, which is aiming to scale up to serve anticipated demand in Japan. The firm is looking to increase its production capacity dramatically—targeting a ninefold expansion—focused on manufacturing power storage systems intended for large energy storage deployments. The expansion reflects expectations that Japan’s market for grid storage will continue to grow as utilities and developers add battery installations to balance intermittent renewable generation.

South Korean suppliers are also eyeing the same opening, leveraging established experience in battery technology and supply chains. With Japan’s project developers and utilities needing compliant equipment, companies able to satisfy certification and security expectations may have a clearer path to winning contracts and forming local partnerships.

Japan has been steadily moving toward a power system that can accommodate larger amounts of renewable energy. That transition is driving interest in storage not only at the consumer and commercial level, but also at the grid scale, where battery systems can provide services such as frequency regulation, peak shifting and backup capacity. As deployment accelerates, procurement criteria—especially cybersecurity and system integrity—are becoming more central, particularly for infrastructure connected directly to the electricity network.

For non-Chinese suppliers, the current environment represents more than a short-term opening. If certification delays continue to limit Chinese participation, Japanese buyers may standardize around alternative vendors for future projects, potentially shaping market share in one of Asia’s most important power markets.

Why it matters

Japan’s push to modernize its grid and expand renewables is creating a fast-growing market for large battery storage systems, but cybersecurity rules are influencing which suppliers can compete. That dynamic could redirect major contracts toward Taiwanese and South Korean firms while Chinese companies remain effectively sidelined. Watch for how quickly certification pathways evolve—and whether Japan tightens or relaxes requirements as storage deployment scales.