Resumen
Today life in many cities strongly depends on electricity. In many articles we can find designs of smart, clean and beautiful modern cities. All aspects of activity in cities are based on the use of control and supply systems. All of them use electricity as control signals and as power. A big but underconsidered problem is reliability of city substructures against Coronal Mass Ejection (CME) from the Sun. These events may damage elements of basic importance for life of people in cities. The article suggests some kinds of protection for the city substructures against CME.