Snowy 2.0 exit cost unknown despite price blowout

The costs of abandoning Snow 2.0 would be immense for the Australian community, the government says. (Lukas Coch/AAP PHOTOS)

The cost of abandoning Australia's largest renewable energy project remains unknown even though it will require more government funding to proceed after a multibillion-dollar cost blowout.

The head of the Snowy 2.0 project told a Senate estimates committee that the expense of terminating the development had not been modelled despite a recent reassessment of construction costs.