Kyiv Mayor Vitali Klitschko says electricity will not be fully restored in the Ukrainian capital for at least three weeks.
This month, Russia resumed strikes on Kyiv, targeting critical infrastructure and forcing Ukraine to implement rolling blackouts.
According to Mr Klitschko, the city’s electricity deficit currently ranges between 20% and 50%.
It is, therefore, still operating in an emergency capacity.
Ukraine’s main power supplier, Ukrenergo, said it hopes to eliminate the shortages within two to three weeks – if there are no further strikes.
Mr Klitschko said: “The city is doing everything possible to save electricity consumption. In particular, trolleybuses have been replaced by buses on many routes of communal public transport.
“At the same time, the capital is not going to stop the metro. Once again, I call on the citizens of Kyiv and businesses to reduce electricity consumption!
“The risk of a major blackout, when a lack of electricity can lead to even greater consequences and an even greater shutdown, there is.”