If you look at the task, you can see the graphs comparing fuel sources (look at the wording of the task). And our report should do that: comparing fuel sources. 

Again, if you zoom in on the task, you can see two types of fuels: Fossil fuels and renewable energies. 

Fossil fuels include coal, oil, and natural gas; green energies cover hydropower and nuclear. 

To write a good report on this, we can follow this organizational framework:

Body 1: 

Focusing on fossil fuels, especially in Australia, where coal became most prevalent 

We compare coal, old, and natural gas use in Australia and France in body 1. 

Body 2: 

Focusing on green energies, especially in France, where nuclear power became dominant. 

We compare the use of nuclear energy and hydropower in France and Australia. 

Overview: 

We mention the drastic changes in the use of fuel sources, with Australia moving toward coal (a fossil fuel) and France toward nuclear energy (a renewable energy).  

I hope this has been helpful.