What is the ruling on installing solar energy systems for hotels that contain bars and nightclubs, knowing that the generated energy will be used throughout the building for the purpose of financial saving, and that the hotel’s facilities draw their electricity whether or not the solar system is present?

If the unlawful element is not predominant or the primary purpose of the services, then there is no harm in providing them. This is because what is overlooked implicitly in something is not overlooked explicitly. The presence of a nightclub or a place for alcohol within a hotel does not prohibit dealing with it for permissible services, as long as the predominant work of the hotel is permissible, and not unlawful.