The armed forces are being deployed to parts of Scotland which have been cut off following Storm Arwen.
Armed forces minister James Heappey said 134 soldiers and marines will assist in the Grampian area and will attempt to reach around 4,000 homes.
The soldiers, working in teams of 10, will be offering reassurance and help to 12 villages that were cut off when the storm hit.
Thousands of people are still without power following "extensive and catastrophic" damage caused by the storm.
Three people were killed by falling trees as winds up to 98mph hit some parts.
One man, who died after his vehicle was struck by a falling tree in Aberdeenshire, has been formally identified as David Lapage, 35.
In a statement released through Police Scotland, his family said: "The family would like to thank all services involved and greatly appreciate all the messages of support."
Scottish and Southern Electricity Networks (SSEN), which distributes power to 3.7 million homes in central southern England and the north of Scotland, said 3,100 homes are still without power.
Northern Powergrid, which manages the electricity network for northeast England, Yorkshire and northern Lincolnshire, said on Thursday night that 6,000 homes remained without power in its area.
Paul Glendinning, executive director at Northern Powergrid, said: "We understand how critical this situation is for our customers and we're working as fast as we can to deal with a storm impact which is one of the worst that our team has seen. Our dedicated teams will not stop until we have everyone affected by the storm back on supply."
Paul Richardson, who lives in Bishop Auckland, County Durham, told Sky News that his family had been without power since last Saturday, 27 November.
He said: "We are a family of five and although the children are all adults they are still living at home.
"Our youngest daughter Emily has Down syndrome, this has many effects on her health, one being that she is more susceptible to cold weather than you or I, so can easily feel the cold and pick up respiratory infections - not what you want in this day with COVID."
Although the family has a log burner, they have resorted to eating out and visiting friends and family nearby for hot showers and to charge devices.
"Wouldn't it be nice if Northern Powergrid invested in its network to make sure it is safe and secure rather than paying the people at the top a fortune and keeping their investors happy?" said Mr Richardson.
Kelly Osborne, who lives in Chester-le-Street, said being without power had left her feeling ill: "My physical health has been affected by the cold - its caused a chest infection alongside the stress of not knowing anything."
Areas most affected included Aberdeen, Aberdeenshire, Moray, Angus, Perthshire and Stirlingshire, with a hundred engineers deployed from the south to help reconnect people.
Aberdeenshire is the main area affected, with 2,400 customers waiting to be reconnected there and in Aberdeen.
There are also around 300 still without power in Angus, around 200 each in Moray and Perthshire, and some 25 in Stirlingshire.
Aberdeenshire Council said in a statement: "Following an approach to the UK government, 120 military personnel are headed to Aberdeenshire to support ongoing resilience efforts in the aftermath of Storm Arwen.
"Troops will focus on welfare checks on the ground within communities still impacted by loss of power."
Mark Rough, SSEN operations director, said: "Due to the extent of damage on the low voltage network, particularly to single premises, some customers in Aberdeenshire will regrettably remain off supply until Saturday and our teams will proactively contact those customers to offer whatever support is required.
"I would like to reassure all customers still off supply that our teams are doing everything they can to restore power as quickly as possible and would once again like to apologise for everyone who has experienced a loss of supply as a result of Storm Arwen."
It comes as rain, sleet and snow have fallen in southwestern parts of the UK, while wintry showers have affected the north and east.
The National Trust said the storm has had a "devastating impact" on wildlife, with around 800 seal pups estimated to have died.