Uniform Regulatory Jurisdiction Act of 1988 - Amends the Natural Gas Act to provide that the rates and charges for natural gas transportation to ultimate consumers in a service area determined by the Federal Energy Regulatory Commission shall be regulated exclusively by the State commission in the State in which the gas is consumed. States that this Act does not apply to natural gas transportation to another gas company. Makes such regulatory jurisdiction effective 120 days after the date of enactment of this Act.