Ukraine has said that as much as 50% of the country’s electricity needs are currently not being met, after massive Russian missile strikes this week.
The Ukrenergo power operator said the priority was to fix key infrastructure but repairs were now taking more time.
President Volodymyr Zelensky said “the most difficult situation” with power as well as water supply was in 15 regions, including the capital Kyiv.
Across Ukraine, winter is setting in, with snow and sub-zero temperatures.
The Ukrainian authorities say they have set up across the country more than 4,000 “points of invincibility” – makeshift heated tents where people can charge their phones and have tea or coffee.