I see your point and you’re not wrong…but the electricity value is the easiest proxy for domestic energy production (OR proximity to energy production). If as a country you don’t have access to or produce electricity, you won’t develop industry, which elevates standard of living. Access to affordable, useable energy at scale relative to your population is critical…the countries in the bottom left don’t have that…the countries in the top right do.
Discussion
Yes, we agree that energy production is key. All I'm saying is that there is no causal relationship that is apparent from this graph, not the correlation (which is very obvious!). The graph measures energy *consumption* and there are many examples you can construct to show that the causality doesn't hold.