Originally Published in Engineers Australia Magazine - Power Engineering Section Page 58
Using molten salt to store solar energy could provide electricity 24 hours a day, equivalent to baseload supply, according to Matthew Wright, executive director of Melbourne based company Beyond Zero Emissions.
"There are plants in Spain operating with energy storage right now, providing electricity all night long," Wright said. Molten salt storage uses common salts, such as potassium nitrate, which are readily available and non-toxic. Using the sun's energy, these salts are heated to high temperatures and stored in insulated storage tanks. When electricity is needed, the heat in the molten salt is used to create steam to drive a turbine.
According to the company, this sort of electricity is dispatchable, meaning it can be sent out on demand at any time of day, so it can replace the baseload electricity generated from burning fossil fuels.
"Solar thermal power with storage is proven technology, which will reliably provide the backbone of modern renewable electricity grids," Wright said.