Ukraine's largest private energy provider says power has been restored to more than one million households in and around Kyiv.
The statement comes a day after Russian missile and drone strikes forced emergency outages across the region.
The attack early Saturday killed two people and knocked out electricity in large parts of the capital and surrounding areas.
DTEK reports 748,000 homes in Kyiv and 347,000 outside the city now have power again.
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The International Atomic Energy Agency said that crucial repairs were underway at the Zaporizhzhia nuclear power plant, thanking both sides for a temporary pause in fighting to allow the crucial work to be carried out.
The site has been the scene of some of the fiercest fighting in the conflict, prompting sporadic fears of a major nuclear disaster. Once a major supplier of Ukraine's energy needs, the plant has been under Russian control since 2022 and is mostly shut down.
Zaporizhzhia's equipment is powered by electricity supplied from Ukraine.
Over the past four years these supplies have been interrupted at least eleven times due to breaks in power lines, forcing the plant to switch to emergency diesel generators.
Emergency generators on site can supply electricity to keep the reactors cool if external power lines are cut.
Russian Foreign Minister Sergey Lavrovsaid that any European troops sent to Ukraine as peacekeeping forces would be a "legimate" target for his country's military.
In comments carried by official news agency TASS, Lavrov accused European leaders of having "ambitions" for Ukraine that disregarded the will of its people. He did not specify what he meant or provide evidence for these claims.
What have the leaders of the US, Ukraine, Russia, and Europe said ahead of the talks? What are the sticking points of the peace plan? Read more here: Trump-Zelenkskyy meeting: What you need to know
Russian President Vladimir Putin claimed that it was Kyiv who wasn't seeking a peaceful resolution to the conflict, despite continuing Russian attacks on the towns of Myrnohrad, Rodynske and Artemivka in Ukraine's eastern region of Donetsk, as well as Huliaipole and Stepnohirsk in the Zaporizhzhia region.
Ukraine rejected this claim, as well as assertions from Moscow that the towns of Myrnohrad and Huliaipole had been completely captured by Russian forces.
The Ukrainian military said that the situation in these regions is "difficult" but "defensive operations" are still ongoing.
"A substantial part of Huliaipole continues to be held by the Defense Forces of Ukraine," the Southern Command of Ukraine's Armed Forces said on Telegram, reporting "fierce fighting" in the town.
Good morning from the DW newsroom in Bonn.
Today, everyone is looking towards Florida where US President Donald Trump and Ukrainian President Volodymyr Zelenskyywill be meeting to discuss a major diplomatic push to end the war nearly four years after Russia's invasion began.
At the same time, fierce fighting continued in eastern Ukraine. Kyiv has denied Russian claims that it has fully captured the towns of Huliaipole and Myrnohrad.