18 CFR §154.603

Whenever the tariff or contracts of a natural gas company on file with the Commission is to be adopted by another company or person as a result of an acquisition, or merger, authorized by a certificate of public convenience and necessity, or for any other reason, the succeeding company must file with the Commission, and post within 30 days after such succession, a tariff filing in the electronic format required by § 154.4 bearing the name of the successor company.