10 CFR 501.9: Effective date of orders or rules.

(a) When OFE issues a rule or order imposing a prohibition or granting an exemption (or permit) under FUA, the rule or order will be effective sixty (60) days after publication in the Federal Register, unless it is stayed, modified, suspended or rescinded.

(b) If the appropriate State regulatory authority has not approved a powerplant for which a petition has been filed, such exemption, to the extent it applies to the prohibition under section 201 of FUA against construction without the capability of using coal or another alternate fuel, shall not take effect until all approvals required by such State regulatory authority which relate to construction have been obtained.