Let me guess: you don't live in Bangladesh. Where there are ~160 million people, and the country is just one big flood plain. Bangladesh already has the highest population density of any "big" country, and the sea is eating away at the land.

If $0.30/kWh is the real price of electricity after externalities have been added in, then so be it. Because the alternative is too awful to imagine.

Also you've forgotten to include in your calculations that Costa Ricans probably use a lot less electricity than Americans. Someone earning $6k.pa probably does not have AC, a huge refrigerator, etc.