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Remote communities that rely on diesel generators could keep their lights on for days or even months, depending on fuel reserves. However, once the fuel is exhausted, the light will fade along with the remaining supply.
Geothermal Plants
Geothermal plants can function without human intervention for extended periods, but they require periodic maintenance. For instance, the Fangi Island geothermal plant in Iceland mandates maintenance every six months. While some systems might operate for several years without service, corrosion eventually claims them.