Kardashev Scale?

Kardasev is a scientist from the former Soviet Union, and the Kardasev scale is a concept that presents the degree of development of civilization presented in the 1960s from the perspective of energy.
Type 1 civilization refers to the state of using up the maximum energy available on Earth, Type 2 refers to the stage where all the energy of the solar system can be used, and Type 3 refers to the stage where the energy of the universe can be used.
The Earth’s civilization has only reached 0.73 of the Type 1 civilization, and Musk claims that the Earth’s energy source is the sun and that using only a fraction of the solar energy reaching Earth will cover the energy currently used on Earth.
Since it can generate 3GWh of electricity per square mile per day, it can produce 1,096GWh per year. In the case of Korea, assuming that 600TWh of electricity is supplied annually by solar power, 600 square miles, or 25 miles on one side, is required. If it is spread out in km, it is 40 km, and an area of 1,600 square kilometers is required. Since Seoul has an area of 600 square kilometers, it is three times that of Seoul, and Gyeonggi Province has an area of 10,000 square kilometers, so 16% is needed…
Of course, power storage is essential because power must be supplied at a time when sunlight does not shine, but fortunately, prices are falling sharply thanks to the remarkable development of battery technology, so you can save it during the day and use it at night.
Musk asks people who say that it’s not enough area to do solar power why don’t they try this simple arithmetic…

Even the Nobel Prize-winning scientists are talking about not being able to use solar power, so I should arrange a discussion with Musk!!