Electricity metering and backup power supply for multi-storey buildings Aktam Denmukhammadiev, Almardon Mustafoqulov, Himalokhon Valikhonova, Erkin Sobirov and Тemur Raimov E3S Web Conf., 264 (2021) 05051 Published online: 02 June 2021 DOI: 10.1051/e3sconf/202126405051