First of all, your question is too general.
It is a high-power unit built in several types of wind farms. IEC1, 2 or 3?
What kind of tower form is used, truss type? Tapered tubular? (The latter is more common, but the former is also used)
What is the geological condition of the wind farm? The foundation is naturally different under different geological conditions. If you are responsible, you must find a qualified design institute.
In addition, even for wind farms of the same power and level, generally large manufacturers (those with real design capabilities) will provide towers of various heights based on the wind farm's topography and other characteristics.
I will give you an example I have come across:
The 2MW tapered tubular steel tower used in IEC2 wind farms is 73 meters high and has three sections, with a top diameter of 3.1 meters and a bottom diameter of 4.2 meters. The wall thickness at different locations is 12--28mm, and the weight is 130 tons. It is a flexible tower. The foundation depends on where it is built. Generally, the total amount of reinforced concrete used is hundreds of tons.