18 CFR § 157.23 - Authorizations to Proceed with Construction Activities.
With respect to orders issued pursuant to 15 U.S.C. 717b or 15 U.S.C. 717f(c) authorizing the construction of new natural gas transportation, export, or import facilities, no authorization to proceed with construction activities will be issued:
(a) Until the time for the filing of a request for rehearing under 15 U.S.C. 717r(a) has expired with no such request being filed, or
(b) If a timely request for rehearing is filed, until the Commission has acted upon the merits of that request.