If a majority of the qualified electors of the city voting on the question vote to ratify this charter in lieu of the heretofore existing charter, this charter shall go into effect immediately upon approval by the governor as provided by the state constitution; provided that section 31 (relating to operation of and accounting for the electric utility) shall go into effect at the beginning of the next succeeding fiscal year unless the council by ordinance provides that it shall go into effect sooner.