Wind Farm Layout Calculator

Standard practice is to space turbines 5–7 rotor diameters (D) apart in the prevailing wind direction (row spacing) and 3–5D in the cross-wind direction. Wider spacing reduces wake losses but requires more land. Offshore farms often use 7–10D spacing due to fewer land constraints.

Wake losses occur when downstream turbines operate in the turbulent, lower-energy wake shed by upstream turbines. This array loss typically ranges from 5% to 15% for onshore farms and can reach 20% in tightly packed layouts. Optimizing turbine spacing and orientation relative to prevailing winds is the primary way to reduce wake losses.

Horizontal-Axis Wind Turbines (HAWT) rotate around a horizontal axis and are the dominant commercial design used in large wind farms. Vertical-Axis Wind Turbines (VAWT) rotate around a vertical axis and can accept wind from any direction without yawing, but are generally less efficient and used in smaller or urban installations.

A rule of thumb is roughly 0.1 to 0.4 km² per MW of installed capacity, depending on turbine spacing and terrain. However, turbines only physically occupy a tiny fraction of that land — the rest can be used for agriculture or other purposes, making wind farms compatible with dual land use.

Onshore wind farms typically achieve capacity factors of 25–40%, while offshore farms range from 35–55% due to stronger, more consistent winds. Your local mean wind speed is the biggest driver — sites with 8–9 m/s average wind speed at hub height generally achieve 35–40% capacity factors.

Theoretical wind power follows the formula P = ½ × ρ × A × v³ × Cp, where ρ is air density, A is swept area, v is wind speed, and Cp is the power coefficient (maximum ~0.593 per Betz's Law). In practice, turbines achieve Cp values of 0.35–0.45. This calculator uses rated power and capacity factor to give a practical energy production estimate.

A typical modern 3.5 MW onshore turbine produces roughly 10–12 GWh per year at a 35% capacity factor, enough to power around 2,500–3,000 average households. A city of 100,000 households might need 35–40 turbines of this size, though actual requirements depend on local wind resource, grid mix, and consumption patterns.

Real wind farm layouts must account for land ownership boundaries, noise setback distances from residences (typically 300–500 m), shadow flicker restrictions, environmental impact zones (wetlands, bird migration routes), grid connection points, access roads, and visual impact guidelines. This calculator provides an idealized layout estimate as a starting point.