Grid operator Ukrenergo said on Sunday the past day had been "difficult" for its workers but that the electricity situation was "under control" and emergency outages were not being implemented.
"Additional volumes of electricity for household consumers have been provided thanks to the concious behavior of Ukrainian business and restrictions on the work of industry," it said in a statement.
Separately, Vyacheslav Gladkov, governor of the southern Russian region of Belgorod bordering Ukraine, said overnight shelling of the outskirts of Shebekino town had damaged houses but there were no casualties.
Russian media also reported multiple Ukrainian attacks on the Moscow-controlled parts of the Donetsk and Luhansk regions, with local officials saying at least nine people were wounded.