life cycle costs
Estimated lifecycle emissions of wind energy are put at 34.1 gCO2e/kWh (Nugent and Sovacool, 2014).
sizing & capacity
The laws of physics dictate that larger rotor diameters and taller hub heights (generally meaning higher wind speeds) will give exponentially higher power outputs than their smaller counterparts.
P = 1/2 ρ E A v3
P = power (W)
ρ = density of air (kg/m3)
E = efficiency of the turbine (e.g. 20% is 0.2)
A = area wind passing through perpendicular to the wind (m2)
v = wind velocity (m/s)
Studies have found that 20 x 5kW turbines have lifecycle emissions of 42.7 gCO2e/kWh, 5 x 20kW 25.1gCO2e/kWh and a 100kW 17.8gCO2e/kWh.
The current record for size is the 8MW Vesta V164 turbine installed off the Danish coast, generating 192,000 kWh in a 24 period (Vestas, 2014).
Click here for an interactive map of some of the largest Renewable Energy Installations in the EU from RWE