In consideration of the right to construct and maintain such facilities and equipment along, upon, across and under the streets, highways, avenues, alleys, bridges and public places of the City, there is hereby imposed upon the Company by the City, and the Company agrees that there shall be collected from Company’s retail customers, in accordance with Company tariffs on file with and approved by the Iowa Utilities Board, and remitted by the Company to the City, a franchise fee in an amount up to and including five percent (5%) of the gross receipts derived by the Company from the transmission, distribution, transportation or sale of natural gas to retail customers within the corporate limits of the City (excluding, however, the sale of natural gas to the City for its own use), commencing with gross receipts received on or after the effective date of this franchise. The specific percentage levels for the franchise fee shall be established by separate ordinance, and may be different for diverse customer classes. The obligation to pay the fee imposed by this section is modified if: (i) the City permits any other person to sell natural gas to City consumers and pay a franchise fee or its lawful equivalent at a lesser rate than provided in this section, in which case the Company shall collect from its customers and pay at the lesser rate; or (ii) if the City adds additional territory by annexation or consolidation and is unable lawfully to impose the franchise fee upon any person selling natural gas to consumers within the additional territory, in which case the franchise fee on the revenue from sales by the Company in the additional territory shall be equal to that of the lowest fee being paid by any other person selling or transmitting natural gas within the additional territory.