Big Wind & Avian Mortality (Part II: Hiding the Problem)

Developing Methods to Reduce Bird Mortality in the Altamont Pass Wind Resource Area also looked at the placement of carcasses in relation to turbine types. It documented that the distances carcasses were found from turbine towers increased significantly as turbine megawatt ratings and blade lengths increased. Based on a sample of about 800 carcasses, the report revealed that birds were found an average of 94 feet (28.5 meters) from 100Kw turbines on towers 81 feet (24.6 meters) high.

Obviously, taller turbines with longer blades and faster blade-tip speeds will catapult stricken birds much further. Figure 1 shows how a turbine 2.5 times larger will result in an average carcass distance of 372 feet (113.5 meters) from the tower. The wind industry is acutely aware of this.

Comments are closed.