A new generation of wind turbine is under development. The plan envisions land-based turbines with a

A new generation of wind turbine is under development. The
plan envisions land-based turbines with a rated power of 4 MW and a diameter of
125 m (about the same as the London Eye, one of the world’s largest Ferris
wheels). One turbine requires 410 metric tons of materials and construction
consumes an energy of 2  107 MJ. The
anticipated capacity factor, C, is 0.3.

(a) What are the nominal material and energy intensities of
the new turbines? How do these compare with the values for existing land-based
turbines in Table 12.2?

(b) What is the expected energy payback time?