Watch Kazuaki Hashimoto chopping firewood for the following winter on a baking day at the end of April, and you may be forgiven for thinking he leads a rather old-fashioned lifestyle.

But Hashimoto, who recently moved from a house with an air conditioner and electric heater in each room to an energy-efficient house with a single wood stove, is at the forefront of a distinctly cutting-edge movement: living off-grid.

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