A portable facility comprising: a power generation unit including a transportable first housing and at least one power generation device attached to the first housing, the first housing including a top wall, a bottom wall, and a surrounding wall, the at least one power generation device being one or more of a wind power generation device, a solar power generation device, and a hydraulic power generation device, and a function unit including a transportable second housing and an electric apparatus disposed inside the second housing and configured to be powered by the power generation unit to operate, the second housing including a top wall, a bottom wall, and a surrounding wall, characterised in that: the first housing and the second housing are freight containers, wherein the power generation unit includes the solar power generation device, the solar power generation device is capable of being housed in the first housing, which is the freight container, and includes a solar panel configured to be placed on an upper side of the top wall of the first housing to perform solar power generation, a roller is attached to the solar panel, an external rail is provided on the upper side of the top wall of the first housing, an internal rail is provided inside the first housing and is supported by the top wall, a connecting rail member configured to connect the external rail and the internal rail with a door of the first housing opened is provided in a connection-releasable manner, so that the solar panel is allowed to be moved with the roller to be guided along the internal rail, the connecting rail member, and the external rail. a power generation unit including a transportable first housing and at least one power generation device attached to the first housing, the first housing including a top wall, a bottom wall, and a surrounding wall, the at least one power generation device being one or more of a wind power generation device, a solar power generation device, and a hydraulic power generation device, and a function unit including a transportable second housing and an electric apparatus disposed inside the second housing and configured to be powered by the power generation unit to operate, the second housing including a top wall, a bottom wall, and a surrounding wall, characterised in that: the first housing and the second housing are freight containers, wherein the power generation unit includes the solar power generation device, the solar power generation device is capable of being housed in the first housing, which is the freight container, and includes a solar panel configured to be placed on an upper side of the top wall of the first housing to perform solar power generation, a roller is attached to the solar panel, an external rail is provided on the upper side of the top wall of the first housing, an internal rail is provided inside the first housing and is supported by the top wall, a connecting rail member configured to connect the external rail and the internal rail with a door of the first housing opened is provided in a connection-releasable manner, so that the solar panel is allowed to be moved with the roller to be guided along the internal rail, the connecting rail member, and the external rail. the first housing and the second housing are freight containers, wherein the power generation unit includes the solar power generation device, the solar power generation device is capable of being housed in the first housing, which is the freight container, and includes a solar panel configured to be placed on an upper side of the top wall of the first housing to perform solar power generation, a roller is attached to the solar panel, an external rail is provided on the upper side of the top wall of the first housing, an internal rail is provided inside the first housing and is supported by the top wall, a connecting rail member configured to connect the external rail and the internal rail with a door of the first housing opened is provided in a connection-releasable manner, so that the solar panel is allowed to be moved with the roller to be guided along the internal rail, the connecting rail member, and the external rail.