Nothing in this chapter shall be interpreted as prohibiting public utility distribution facilities, such as water distribution lines, sanitary sewers and telephone, electric, cable TV and natural gas distribution lines, along with related attendant facilities, intended for local service, which utility systems are permitted in all zone districts when approved by the appropriate serving utility agency. Other public utility installations, including, but not necessarily limited to, utility service and maintenance yards, electrical power generating stations, utility truck storage and utility maintenance buildings and yards, are permitted as conditional uses, but only when meeting the requirements of Subsection 12-25.21.