Australia leads world in residential solar per capita with 22GW installed but commercial and industrial sector has deployed only a quarter of that Get our breaking news email , free app or daily news podcast Australia’s revolution in rooftop solar has left behind commercial and industrial buildings where installations have lagged far behind homes, according to new analysis. Australia leads the world in residential solar on per capita terms, with 22GW installed as of last December. But businesses have only installed about a quarter of that – 5.6GW – despite consuming more electricity than households, a report from the Institute for Energy Economics and Financial Analysis (IEEFA) has found.