ODESA, Ukraine (Reuters) -The Ukrainian port city of&nbsp;Odesa&nbsp;on Saturday&nbsp;restored&nbsp;power&nbsp;to critical infrastructure&nbsp;after&nbsp;a&nbsp;fire&nbsp;broke&nbsp;out&nbsp;at an overloaded&nbsp;substation, leaving nearly 500,000 people without&nbsp;electricity, a top official said.
The blaze, which erupted earlier in the day, is a new blow to the country's ailing energy grid that has been hammered by Russian strikes for months.
Officials said repairs could take weeks. The government said it would appeal to Turkey for help.
"Power&nbsp;to all critical infrastructure has been&nbsp;restored. The city will therefore have water and heat," Ukraine Energy Minister German Galushchenko wrote on Facebook late in the day.
"About&nbsp;a third of the city's consumers now have lighting," he said, without&nbsp;giving precise details, adding that 31 high-power&nbsp;generators were on their way to the city.
The CEO of the state grid operator, Volodymyr Kudrytskyi, earlier said critical equipment that had already been damaged several times by Russian missile strikes burst into flames when it could no longer "withstand the load".
He told a briefing that any further Russian missile or drone attacks could make matters even worse.
Since October, Moscow has waged a campaign of massive missile attacks on energy infrastructure. Moscow says the strikes aim to reduce&nbsp;Ukraine's&nbsp;ability to fight; Kyiv says they have no military purpose and are intended to hurt civilians.
"The situation is difficult, the scale of the accident is significant, it is impossible to quickly&nbsp;restore&nbsp;power&nbsp;supply," Prime Minister Denys Shmyhal wrote on Telegram.
Odesa&nbsp;regional governor Maksym Marchenko said practically all of the city had lost&nbsp;power&nbsp;after&nbsp;the incident, and that as of Saturday&nbsp;afternoon about&nbsp;500,000 people faced&nbsp;outages.
That represents about&nbsp;half of&nbsp;Odesa's pre-war population of one million, when it was&nbsp;Ukraine's&nbsp;third largest city.
"Today's&nbsp;power&nbsp;supply (availability) allows to supply the city and the district about&nbsp;40 or 45%, but if we factor in critical infrastructure, then of course very little is left for ordinary citizens," Kudrytskyi said.
The temperature in&nbsp;Odesa&nbsp;stood at two degrees Celsius (35.6&deg;Fahrenheit) on Saturday and is due to dip below freezing for much of next week.
Shmyhal said he had ordered&nbsp;Ukraine's&nbsp;foreign ministry to appeal to Turkey to send&nbsp;powerships - vessels that carry&nbsp;power&nbsp;plants - to come to the city's aid.
(Reporting by Max Hunder, Iryna Nazarchuk and David LjunggrenEditing by Alexandra Hudson, Ros Russell, Frances Kerry and Diane Craft)

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Ukraine's Odesa battles to restore power after fire wipes out substation