Residents were evacuated as a fire tore through an electrical substation leaving 500 homes without power.
The blaze broke out on Inchoch Street in Gartharmlock, Glasgow, at 5pm.
Police and firefighters rushed to the scene and those living near the substation were led to safety.
No one was injured.
An investigation into the cause of the fire is underway.
The power to 500 homes was cut although around half had electricity restored within an hour.
Scottish Power engineers were working throughout the night to restore power to the rest of the homes.
Inspector Alan Bowater from Greater Glasgow Police Division said: "We are working with our partners in the Scottish Fire and Rescue Service, Scottish Power and Glasgow City Council to make sure that people are safe and that power is restored as soon as possible.
"We have increased our high-visibility patrols in the area to provide additional reassurance throughout the evening.
"An incident caravan has been located close to Inchoch Street where people can come and talk to officers should they wish."
He added: "For people trying to contact friends or family in the Garthamlock area, please be aware that landlines may be without power, or mobile phones may be without charge."
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