Nothing in this ordinance shall be construed to preclude or interfere with the implementation by an electric utility company of measures necessary to assure the provision of adequate, efficient, reliable and environmentally safe service, as required by the Illinois Public Utilities Act (220 ILCS 5/1-101 et seq.). Nothing set forth in this Chapter shall be deemed to modify the terms of any existing franchise agreement or franchise ordinance otherwise applicable to any electric utility company, or to excuse any performance required by such agreement or ordinance, or to limit any authority that may be exercised pursuant to such agreement or ordinance, or to limit any remedy that may be available under such agreement or ordinance.