There is hereby granted to Utah Power & Light Company, its successors and assigns (herein called the "Grantee"), the right, privilege or franchise, until July 1, 2030, to construct, maintain and operate in the present and future, streets, alleys and public places in the City, and its successors, electric light and power lines, together with all the necessary or desirable appurtenances (including underground conduits, poles, towers, wires, transmission lines, and telegraph and telephone lines for its own use), for the purpose of supplying electricity to the City, the inhabitants thereof, and persons and corporations beyond the limits thereof, for light, heat, power and other purposes.