Armed Forces Minister James Heappey said 134 soldiers and Marines would assist in the Grampian area and attempt to reach around 4,000 homes.
The soldiers, working in teams of 10, will have the mission to reassure and help 12 isolated villages when the storm hit.
Thousands of people are still without electricity as a result of the “significant and catastrophic” damage caused by the storm.
Scottish and Southern Electricity Networks (SSEN), which distributes electricity to 3.7 million homes in central southern England and northern Scotland, said 3,100 people were still off.
Paul Richardson, who lives in Bishop Auckland, told Sky News his family has been without family since Saturday, November 27.
He said: “We are a family of five and although the children are all adults, they still live at home.
“Our youngest daughter Emily has Down syndrome, it has many effects on her health, one being that she is more sensitive to the cold than you or me, so we can easily feel the cold and get respiratory infections. – not what you want on this day with COVID. “
Although the family had a wood-burning stove, they resorted to dining out and visiting friends and family nearby to take hot showers and recharge 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 not having electricity had made her sick: “My physical health was affected by the cold – it caused a lung infection in addition to the stress of. know nothing. “
The worst affected areas included Aberdeen, Aberdeenshire, Moray, Angus, Perthshire and Stirlingshire, with a hundred engineers deployed south to help reconnect people.
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This will complement what our teams have been doing since the weekend.
We continue to appreciate all great examples of community support.
Rest assured that we continue to work tirelessly to provide the support our communities need during this difficult time.
– AberdeenshireCouncil (@Aberdeenshire) December 2, 2021
Aberdeenshire is the main affected area, with 2,400 customers waiting to be reconnected there and in Aberdeen.
There are also around 300 without electricity in Angus, around 200 each in Moray and Perthshire and around 25 in Stirlingshire.
Aberdeenshire Council said in a statement: “Following an approach to the UK government, 120 servicemen are heading to Aberdeenshire to support the resilience efforts underway in the aftermath of Storm Arwen.
“The troops will focus on on-the-ground welfare checks in communities still affected by the loss of power. “
Earlier, Downing Street said about 19,500 homes remained without electricity following one of the “most devastating” storms in 20 years.
Three people were killed by falling trees as winds peak at 98 mph in some areas.
Mark Rough, SSEN’s Director of Operations, said: ‘Due to the extent of the damage to the low voltage grid, especially in isolated premises, some Aberdeenshire customers will unfortunately remain out of service until Saturday and our teams will proactively contact these customers to offer any assistance. is required.
“I want to reassure all customers still out of supply that our teams are doing everything in their power to restore power as quickly as possible and I would like once again to apologize to all those who have suffered a loss of supply following Storm Arwen. “
It comes as rain, sleet and snow fell across the UK’s south-west, while winter showers hit the north and east.
More snow is expected to hit Scotland on Friday before it moves south-east.
Meanwhile, the National Trust said the storm had a “Devastating impact” on wildlife, with around 800 baby seals dead.