Subsections (a) and (b) shall not apply to deepwater ports for natural gas. A licensee of a deepwater port for natural gas, or an affiliate thereof, may exclusively utilize the entire capacity of the deepwater port and storage facilities for the acceptance, transport, storage, regasification, or conveyance of natural gas produced, processed, marketed, or otherwise obtained by agreement by such licensee or its affiliates. The licensee may make unused capacity of the deepwater port and storage facilities available to other persons, pursuant to reasonable terms and conditions imposed by the licensee, if such use does not otherwise interfere in any way with the acceptance, transport, storage, regasification, or conveyance of natural gas produced, processed, marketed, or otherwise obtained by agreement by such licensee or its affiliates.