The Albanese government on Wednesday will introduce legislation to ensure the NBN remains in government ownership.
The move is designed to set up a test for the Coalition, putting pressure on the opposition ahead of the election to declare whether it would try to privatise the NBN.
The government said in a statement from Prime Minister Anthony Albanese, Finance Minister Katy Gallagher and Communications Minister Michelle Rowland: "The Coalition rushed to declare the NBN 'complete' so they could put it on the block for sale - selling out Australian consumers and regional communities.
"The Albanese government won't let that happen. This legislation will ensure the NBN is owned by who it belongs to - the Australian people."
The upgrades the government had undertaken "are already making a real difference in the lives of Australians through faster, more reliable internet access. Keeping the NBN in public hands will lock in affordable and accessible high speed internet for all Australians for generations to come."
Albanese said:"The Coalition made a mess of the NBN - my government is getting on with the job of fixing it and making sure it stays in public hands, where it belongs."
Rowland said: "Australians don't trust the Coalition not to flog off the NBN just like they did with Telstra, resulting in higher prices and poorer services, especially in the regions."
Downgraded
The Rudd Labor government announced what was to be a predominantly fibre-to-the-home wholesale network in 2009, promising it would cost $43 billion and later be privatised to claw back the expense.
In 2010 Communications Minister Stephen Conroy said Labor "remained firmly committed to selling its stake in NBN Co after the network was fully built and operational, subject to market conditions and security considerations".
By 2020 the government was estimated to have spent $51 billion on a scaled-down version of the project completed using a mix of technologies.
In June that year a review by the Parliamentary Budget Office put its fair value at $8.7 billion.