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National power grid operator Ukrenergo said that as of 7 p.m. local time (1700 GMT), 30% of electricity supplies were still out, and asked people to cut back on their energy use.
"Phased restoration of the power system is continuing. Repairs crews are working around the clock," it said in a statement on Telegram.
President Volodymyr Zelenskiy went to the town of Vyshhorod just north of Kyiv on Friday to look at a four-storey building damaged by a Russian missile. He also visited one of the many emergency centres that have been set up to provide heat, water, electricity and mobile communications.
"Together we will be able to go through this difficult path for our country. We will overcome all challenges and we will definitely win," he said in a video statement.