Am e ndm e nts. Th is A gree m e nt and th e Xxx e duel s attach e d h e re to m ay be am e nde d from xxx e to xxx e by th e m utualagree m e nt of th e Parties in w riting. Am e ndm e nts th at are s ubje ct to FERC approvals h allnot tak e e ffe ct untilFERC h as acce pte d s uch am e ndm e nts for fiilng and h as m ade th em e ffe ctive .