The following graph gives information about the proportion of electricity generation across Australia.The items include coal, natural gas, bioenergy and so on. According to this graph, the proportion of coal is around 73%, and that of natural gas is lower, which is around 13%. You can see from this graph that the highest proportion is coal, which is around 73%. You can also see from this graph that the lowest proportion is the bioenergy, which is around 1%.In conclusion, coal has the highest proportion of electricity generation across Australia