Since the beginning of time, people have gradually consumed more and more energy alongside technology advancements. Consumption was initially around 3 kWh per day per person and was mostly used for nourishment. Because of the necessity and possibility of heating for warmth, consumption in prehistoric times rose to 6 kWh primary energy per day.
In the Middle Ages, people in Europe wore more clothes and created more elaborate houses
and churches, increasing the daily energy consumption to 24 kWh. Today, we use less than 6 kWh
for pure nourishment, with more than 12 kWh for the preparation and transportation of food.
US and German citizens consumed in 2019
about 219 and 120 kWh per day, respectively.
The 2019 data on energy consumption (BP) and population (PRB) show that the average daily energy consumption of a person in India is still just 19 kWh. But China at 75 kWh is already above the world average and will consume approximately the same amount of energy as industrial nations in the next few decades. In 2019, the world primary energy consumption was 13.9 billion toe (ton of oil equivalent). With a world population of about 7.7 billion, we now have a world average consumption of primary energy of 58 kWh per day per person.
If the world population increases to 10 billion as expected, and all countries advance to match the present consumption of US, the world energy demand will eventually increase nearly sixfold.