Official estimates of the risk of an electricity shortfall this summer are exaggerated because much more solar energy - as much as six times current large-scale capacity - is ready to be built, the Australian Solar Council says.

Completed large-scale plants total 310.8 megawatts,which will be dwarfed by the 2054 MW of large-scale solar photovoltaics (PV) plants that have secured finance and/or a power purchase agreement, the council says.

The Nyngan solar plant near Dubbo, NSW, built by AGL with government help, got the ball rolling on large-scale solar plants.

However, the project pipeline would put even that increase in the shade, with 10,266 MW in some part of the approval process.

"You have a massive build and development under way," John Grimes, the council's chief executive, said.