Economies are more than raw energy sources. Economies compete on 'value chains'. You are completely correct that if you have cheap, abundant energy then you are at a strong advantage however this is not enough to win the day and exert economic power on a global scale. The economies that dominate have consistent cheap energy supplies but then complement this by building value chains on top which yields compounding value (US in the 50s, Japan in the 80s, China in the 2000s). Australia is probably the stand out example of abundant, cheap energy and no economic power because they failed to harness value addition (ingenuity) in their economy and instead chose to sell energy capacity. The economy that can value add in the most efficient manner with persistent access to the cheapest energy accrues the most economic (and by extension geopolitical) power. You need both elements imo.