According to available data, at least 8.22 GW of thermal power plants and thermal power plants were affected in Ukraine yesterday (at least 1.8 GW more today). This is about 30% of heat and 15% of all generation in the country.
Also, this volume is approximately equal to the number of non-operating thermal power plants and thermal power plants for the same period last year, when Ukraine experienced problems with coal reserves. But then the problem of shortage of electricity could be compensated by the emergency load of nuclear power plants.
Now it is impossible to do this, since 40% of nuclear generation falls on the Zaporizhzhya NPP