Ukraine has increased imports of electricity and halted exports after a series of Russian missile and drone attacks.
"For the current day, electricity imports are forecast at 14,900 megawatt hour (Mwh)," the Ukrainian energy ministry said.
"No exports are expected."
Russia has said its assaults early on Sunday targeted Ukraine's electric power and gas-producing facilities.
Generation and transmission plants were also attacked by Russia on Friday, causing significant blackouts in many regions.
On Sunday, energy facilities in three Ukrainian regions were targeted.
Russia tried to hit a critical infrastructure plant in the Lviv region, the ministry said.
"Equipment caught fire and the facility was de-energised," it said.
"There were no casualties. The consequences are being assessed."
The ministry added that power lines in the Kyiv region were damaged, with 1,400 households losing power.
