In Australia, up to December 2018, 2 million solar power plants were installed among 24 million population in Australia. Thus, about 20% of the country’s total houses already have its own energy generating systems that provide electricity from the Sun. At the same time, South Australia’s houses, which have its  own solar power plants, account for about 31%, i.e. each of the 12th person has a solar power plant. If the current pace of development of the sector continues in that country about 3 million houses will be provided by solar power plants in four years.

Source: Here.