((a)) ** General rule** The Commission may not, during the 10-year period beginning on , revoke or amend any certificate of public convenience and necessity issued before , under section 7 of the Natural Gas Act [] for the transportation of natural gas owned by any electric utility except upon the application of the person to whom such certificate was issued.15 U.S.C. 717fNovember 9, 19781978-11-09January 1, 19691969-01-01

((b)) ** Commission curtailment authority** The limitation under subsection (a) shall not affect the authority of the Commission to enforce any curtailment of deliveries of natural gas under the Natural Gas Act [ et seq.].15 U.S.C. 717