The prime minister and opposition leader will head to cyclone-hit north Queensland on Thursday to inspect damage and see relief efforts first-hand.
About 1200 Australian Defence Force personnel have been committed to the recovery operation, Queensland Assist 17, to support emergency services workers and volunteers.
They will be supported by RAAF aircraft and HMAS Choules, a landing ship with a range of disaster relief capabilities.
Acting chief of joint operations Major General Stuart Smith said areas and activities for the ADF were still being determined.
"Tasks will include evacuation, aeromedical transport, search and rescue, assisting to restore critical infrastructure, road and route clearance, emergency food, water, fuel and shelter delivery and distribution, as well reconnaissance, surveillance and damage assessments," Major General Smith said on Wednesday.
About 63,000 households across north Queensland had no power on Wednesday, with some expected to be in the dark for a week.
There's expected to be massive economic impacts for farmers in the cyclone zone tourism, with Debbie inflicting significant damage to Whitsunday Island resorts.
A 300km stretch of cane fields has been ravaged in a region responsible for about half of Australia's $2 billion sugar industry.
However, in happy news, two baby girls have been safely welcomed into the world after their mothers were forced to give birth at ambulance stations in the disaster zone.
Mr Turnbull received a briefing at the crisis co-ordination centre in Canberra as Queensland authorities assessed the damage from the category four cyclone.
"It's now our job to make sure that every agency pulls together and, indeed, the private sector, particularly the banks and insurance companies ... to provide support to the people of north Queensland who have had a very tough day and night," Mr Turnbull told reporters.
"There will be a lot of damage."
Labor leader Bill Shorten put the insurance companies on notice over their reaction to the cyclone's destruction.
"Australians are watching how the insurance companies handle the legitimate claims for insurance," he told reporters in Canberra.
"People will be watching to make sure there is a timely, reasonable, non-bureaucratic, non-stingy approach to people making insurance claims."
Queensland federal Liberal National Party MP George Christensen, whose seat of Dawson covers the area hardest hit, has cut short his attendance at parliament in Canberra to be with his local community.
"Now that I'm satisfied all federal government assistance for cyclone-affected areas is sorted, I'm leaving parliament a few days early to come back home and help with the clean-up," he wrote on Facebook.
