The utility scale wind model reports a value called "Approximate land use" in the Metrics table. The value is an estimate of land occupied by turbines, roads, and buildings, not the total land area that contains the wind farm.
Here are the assumptions:
Each turbine has a 10 m x 10 m footprint:
A = Number of Turbines x 100 m^2
A 4 m wide road connects each turbine:
B = Number of Turbines x 4 m x Turbine Spacing (m)
The wind farm has a building, structure, or other land use with a 5000 square-meter footprint:
C = 5000 m^2
For each wind turbine, an additional 100 square-meter footprint is required:
D = Number of Turbines x 100 m^2
And, the equation:
Approximate Land Use = A + B + C + D 
