North Dakota Century Code Title 49. Public Utilities § 49-04-02. Reasonable charges for services and commodities of public utility

All rates and charges made, demanded, or received by any public utility or by any two or more public utilities for any product or commodity furnished or to be furnished, or any service rendered or to be rendered, shall be just and reasonable. Every unjust and unreasonable rate or charge made, demanded, or received for such product, commodity, or service is prohibited and unlawful.