It is calculated based on the installed capacity.
For example
If you build a home solar power station, which consumes about 10 kilowatt hours of electricity every day, you can install 4kw. It will take about 3.5w to install one. ;
The more kilowatt-hours of electricity used, the larger the installed power station will be and the more funds will be needed.
From Huayang Green Building-Solar Power Generation Explanation.
The price of wind power is indeed higher, it is about 1 times more expensive than thermal power. However, judging from the trend, the cost of wind power generation is on a downward trend, and has now dropped to 0.5~0.6 yuan per kilowatt/hour, which is the entire cost of wind power. As technology advances, costs will fall further. Compared with thermal power generation, one of the biggest advantages of wind power is its environmental benefits. At present, the incomplete cost of thermal power generation has reached 0.2~0.3 yuan per kilowatt/hour, which does not include the treatment cost of discharged pollutants. Moreover, thermal power generation is also affected by the fluctuation of fossil energy prices.