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In 2022, Japanese households added 313 megawatts and 877 megawatt-hours, making this one of the most active home-battery markets in the world.
Source: https://grist.org/energy/itochu-quietly-assembled-a-gigantic-home-battery-network-in-japan/
The battery system is capable of supplying the grid with 36 megawatts of power for four hours, or 144 megawatt-hours in total.