(a) Rate on file. A local distribution company that has a rate on file with an appropriate state regulatory agency for city-gate transportation services must determine its rates and charges for transportation of emergency natural gas in accordance with §284.123 of this chapter.

(b) Rate not on file. A local distribution company that does not have a rate on file with an appropriate state regulatory agency for city-gate transportation services must determine its rates and charges for transportation of emergency natural gas (per unit volume of emergency natural gas transported) in accordance with §284.224(e)(2)(ii) of this chapter.