Ukrainians conserved electricity and some went without running water to try to ease pressure on the grid and give engineers a chance to rebuild infrastructure destroyed by Russian strikes as Kyiv's forces advanced toward the city of Kherson.
Although Ukraine is successfully prosecuting counteroffensives against Russian forces in the east and the south, it is struggling to protect power-generating facilities and other utilities from Russian air and drone strikes designed to disrupt lives and demoralize people as winter approaches.
The Ukrainian government Thursday placed restrictions on electricity usage nationwide for the first time since Russia's Feb. 24 invasion following a barrage of attacks which President Volodymyr Zelenskyy said had struck a third of all power plants.
Under the new energy-saving regime, power supply across Ukraine was restricted on Thursday between 7 a.m. and 11 p.m.
Ukraine's energy minister said the government was seeking a 20% reduction in energy use and that Ukrainians were responding to the appeal to limit usage.
"We see a drop in consumption," he said. "We see a voluntary decrease. But when it is not enough, we are forced to bring in forced shutdowns," Minister Herman Halushchenko told Ukrainian TV.
Russia had carried out more than 300 airstrikes on Ukrainian energy facilities since Oct. 10, he added.
Zelenskyy told the nation in a Wednesday night video address: "There is new damage to critical infrastructure. Three energy facilities were destroyed by the enemy today.
"We assume that Russian terror will be directed at energy facilities until, with the help of partners, we are able to shoot down 100% of enemy missiles and drones."
One of the facilities hit on Wednesday was a coal-fired thermal power station in the city of Burshtyn in western Ukraine.
"Unfortunately there is destruction, and it is quite serious," Svitlana Onyshchuk, Ivano-Frankivsk's governor, said on Ukrainian television.
"Please limit your electricity consumption," Zelenskiy told Ukrainians in the same address to the nation.
The Ukrainian leader was due to address an EU summit later on Thursday. Leaders of the 27 member states will discuss options for more support to Ukraine, including energy equipment, helping restore power supply and long-term financing to rebuild.
Cities such as the capital Kyiv and Kharkiv in the northeast announced curbs on the use of electric-powered public transport such as trolleybuses and reduced the frequency of trains on the metro.
DTEK, a major electricity supplier in Kyiv, told consumers it would do its best to make sure outages did not last longer than four hours.
The whole northeast region of Sumy, which borders Russia, said it would go the entire day - from 0700 to 2300 local time - without water, electric transport, or street lighting.
"We need time to restore power plants, we need respite from our consumers," Volodymyr Kudrytskyi, head of grid operator Ukrenergo, told Ukrainian TV.
Russia's defense ministry said on Thursday it was continuing to target Ukrainian energy infrastructure, a strategy it has stepped up since the appointment earlier this month of Sergei Surovikin - nicknamed "General Armageddon" by the Russian media because of his alleged toughness – as overall commander of what Moscow called its "special military operation".
Reuters witnesses said five drones hit the southern port city of Mykolaiv on Thursday, but it was unclear where they had exploded.