Kyiv, Ukraine - Ukraine is restricting power use as a response to Russian attacks on energy infrastructure that have raised fears about how the war-torn country will get through the winter months.

National energy company Ukrenergo told Ukrainians to charge up their phones, power banks, and batteries and make sure they have torches at the ready, ahead of outages starting on Thursday that could last up to four hours.

To limit the blackouts, the entire population was urged to use as little electricity as possible between the hours of 7:00 AM and 10:00 PM.

In the capital Kyiv, electricity failed briefly in some households on Wednesday evening.

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At the start of last week, the Russian army increasingly used missiles and Iranian-made drones to hit Ukraine's civilian infrastructure, including electricity and water supplies.

Ukrainian President Volodymyr Zelensky said on Tuesday that one-third of Ukraine's power stations had been destroyed in the strikes. By Thursday, government authorities had raised that figure to 40%.

The weather will bring tougher conditions for Ukrainians – both for the troops on the front lines and civilians who now face enduring the country's bitterly cold winters in the dark and without heat. Some contested areas in the Donbass area already struggle with energy shortages.

"We will do everything possible to restore the normal energy capabilities of our country," Zelensky said late Wednesday. "But it will take time and combined efforts with you."

"Please do not turn on unnecessary electrical appliances!" he appealed.

Work is under way to provide mobile power sources for critical infrastructure in major cities, towns, and villages, he said.