At 7.45 AM on April 20, 2017, there was received report on partial power supply cut in 41 settlements on the territory of 9 municipal districts (Tetyushi, Zelenodolsk, Kamskoe Ustye, Kaybitsy, Pestretsy, Atnya, Kukmor, Rybnaya Sloboda, Laishevo Districts and the city of Kazan). Total of 15,846 people, including 4,320 children, living in 3,218 houses fell into the cut, as well as social objects: 27 schools, 2 boiler rooms. A group of territorial subsystem of RSChS involved in eliminating causes: 168 people, 66 pieces of technique.