The Australia Institute report is slightly misleading. Norway has 5 million people. Norway's reserves per person are 952 barrels, whereas Australia's barrels per person are 158. The UK, often bizarrely compared to Norway, has a paltry 63 barrels per person. To their credit, Norway understood the power of compounding and invested wisely, but they had far more scope to do so.
On the Canada nuclear thing and subsidies, Canada indeed subsidises its energy sector, as does Australia to an even greater extent. The difference is that Australia still has far higher energy bills.