Residents in north-east China are experiencing unannounced power cuts, as an electricity shortage which initially hit factories spreads to homes.
People living in three provinces have complained on social media about the lack of heating, and lifts and traffic lights not working.
Local media said the cause was a rise in coal prices leading to short supply.
The country is highly dependent on coal for power.
One power company said it expected the power cuts to last until spring next year, and that unexpected outages would become the new normal.
Its post, however, was later deleted.
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