What is the largest electric company in Japan?

Written by Editorial Team | Last Updated: August 2026

Tokyo Electric Power Company Holdings, widely known as TEPCO, is the largest electric utility company in Japan measured by power generation capacity, revenue, and customer base. Serving the densely populated Greater Tokyo Area and surrounding Kantō region, TEPCO operates a massive portfolio of thermal, hydroelectric, and nuclear generation assets alongside extensive transmission grids. Despite undergoing major structural reorganizations following historical nuclear incidents, TEPCO remains a foundational pillar of Japan's national energy infrastructure.

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