Tower sections for towers of wind turbines and methods for installing towers of wind turbines are disclosed. A tower includes a preassembled power module having a first cross-sectional area. The tower section includes a wall having an inner surface and an outer surface. The inner surface defines a tower interior and has a first diameter. The tower section further includes a tower flange extending from the wall into the tower interior and having a second diameter less than the first diameter. Further, the tower section includes a platform assembly affixed to the wall and having a third diameter greater than the second diameter. The platform assembly defines an aperture having a second cross-sectional area greater than the first cross-sectional area.