Information about the amount of wind energy is available from the global wind atlas (Downloaded from https://globalwindatlas.info/ ) and is available to you as the raster layer Power-density_100m.tif.
The value in the cells of this raster layer is the annual mean power density for wind turbines with a hub height of 100 meters, the unit is W/m2.
For this screening, we are looking at wind turbines with a total height of 150m (hub height = 100m) and a rooter diameter of 117 m. This specification means that the wind turbine approximately can produce ¼ * π * 117 ≈10751 times the value in the cells of the raster layer given in wats.
This is if they were 100 % efficient in converting wind energy to electric energy, the theoretical maximum (Betz limit) is 59.3 %, however, let’s say our wind turbine has an efficiency of 45% it can therefore produce 10751*0.45 = 4838 times the value in the raster layer.
If we also assume that we need a production of 30 Million kWh for the wind turbine to be economically sound that means that we need an annual mean wind density of 30.000.000.000/(365,2*24)/ 4838 ≈ 707 W/m2.
You, therefore, need to find cells in the Power-density_100m.tif file where the value is larger than 707.
How do I calculate this in a raster calc in QGIS?