Erex Co Ltd is a Japan-based company mainly engaged in the integration and promotion of fuel business, power generation business, trading business, and power retail business, with renewable energy as its core. The electricity retail business sells electricity to corporate and individual consumers nationwide from Hokkaido to Okinawa. The power generation business owns four biomass power plants in Saiki, Buzen, Ofunato, and Okinawa. The fuel business aims to utilize unused wood residues, rice husks, and other biomass fuels and strengthens external sales. The trading business works to procure stable and price-competitive electricity by combining procurement from wholesale electricity exchanges and other sources. The trading business also engages in electricity-related trading operations to reduce the risk of fluctuations in electricity market prices. The overseas business promotes the expansion of renewable energy businesses in Asian countries.