Siemens: Picture the Future  

There have been plenty of plans to switch Australia to 100% clean energy floated in recent times (see Beyond Zero Emissions and Desertec Australia for some examples).

The latest entrant is from Siemens, with their "Picture the Future: Australia (Energy)" (pdf) report recommending Australian business and governments spend $60 billion on alternative energy initiatives.

The report says that to meet 2050 carbon emission targets, all road vehicles would need to be electrically powered and all electricity would come from a mix of wind, solar, geothermal, hydro and gas (along with carbon-capture coal, which is an unlikely component).

Siemens also recommends all buildings be made energy efficient and smart grids helping to match demand with supply. Large-scale energy storage is expected to enable solar power to take a dominant position and nearly all homes will have rooftop solar PV.

Siemens also proposes to link Western Australia to the eastern seaboard grid system through a DC transmission network, enabling the use of large-scale solar and geothermal power stations in central Australia (unsurprisingly, given that they are one of the leaders in this field).