Russia launched a barrage of missiles and drones on Saturday, damaging energy facilities in five regions across Ukraine, officials said.
Ukraine's national grid operator Ukrenergo said the attack damaged energy facilities in the eastern Donetsk, southeastern Zaporizhzhia, and Dnipropetrovsk regions, central Kyrovohrad region, and Ivano-Frankivsk region in the west.
"This morning, the Russians launched another strike on Ukrainian energy facilities. Since March, it is already the sixth massive, complex, missile and drone attack against the civilian energy infrastructure," Ukrenergo said.
Ukrainian air defence shot down 35 of 53 Russian missiles and 46 of 47 Russian drones, the air force commander said.
Since March, Russia has stepped up its bombardments of the Ukrainian power infrastructure, knocking out the bulk of the thermal and hydropower generation, causing blackouts, and pushing electricity imports to record highs.
During the attack, DTEK, Ukraine's largest private energy-generating company, said that its two thermal power plants were hit, and equipment was "seriously damaged."
Regional officials reported that firefighters were extinguishing fires on several sites following the strikes. There were no immediate reports of casualties.

US halts flights at busy East Coast airports due to communications issues
MS NOW, CNN and Politico to sue over White House ban
Pakistan says it killed 28 militants, Afghan Taliban and UN report 3 civilian deaths
New air traffic control failure delays flights at UK airports
Textile factory fire in southern Chinese city of Foshan kills 8