According to an optimistic forecast, power outages may last up to 12 hours a day. However, in the worst-case scenario, these outages could extend to 20 hours daily, impacting heating in many apartment buildings.
As Popenko states, if the temperature drops to -10 °C for several days, it could overload the heating system in many urban areas. With the stable operation of 8–9 nuclear power units and the restoration of about 3 gigawatts of damaged capacity, power outages might be limited to 12 hours a day.
However, if only 2 gigawatts are restored and only 6–7 nuclear units are operational, longer outages may occur, especially if attacks on the energy infrastructure continue.
Popenko warns that most apartment buildings are not adequately prepared for winter. Without major renovations, these structures lose between 40% to 50% of heat, leading to high energy consumption even at the beginning of the season.
He advises residents to check the building's networks for issues with electricity, water, and sewage, and to carry out necessary repairs to prevent potential disruptions during severe cold spells.
For buildings taller than nine stories, backup power sources are essential to ensure the operation of water pumps, heating systems, and elevators during power outages.
For those with individual heating systems, Popenko suggests servicing boilers, underfloor heating, and heaters. He also recommends that neighbors collaborate to insulate common areas, such as entrances, which can help retain heat and reduce energy consumption.