Russia has launched a "new massive strike" targeting Ukraine's energy grid, Ukrainian President Volodymyr Zelensky has said.
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He added that the attacks were on a "very wide" scale, hitting regions in Ukraine's west, centre, south and east.
In an evening address, Mr Zelensky said power had been restored in multiple areas where it had been cut off.
Officials had said earlier on Saturday that nearly 1.5 million households had been left without electricity.
In his video, Mr Zelensky added that most of the Russian missiles and drones were being shot down, and such strikes would not stop a Ukrainian military advance.
"Of course, we do not yet have the technical ability to shoot down 100% of Russian missiles and attack drones. We will gradually come to this - with the help of our partners, I'm confident of this," the Ukrainian leader said in a video.
Almost a third of Ukraine's power stations and other energy-generating facilities have reportedly been destroyed in a wave of air strikes since Monday last week.
The areas targeted by the latest attacks include the Cherkasy region, south-east of the capital Kyiv, and the city of Khmelnytskyi, further west.
Air strikes and power disruptions were also reported from Odesa in the south to Rivne and Lutsk in the north-west.
The national electricity operator, Ukrenergo, said the strikes may have caused more damage than intense bombardment earlier this month.
Mr Zelensky said that 36 rockets had been launched on Saturday, and most of them had been downed.