Ilex, the agency that is in charge of the installation, said a number of issues have arisen.

BBC: Derry public art piece Mute Meadow left in the dark

While a single wind-turbine does not affect the global atmosphere, the installation of a large number of such devices will interfere with the atmospheric circulation and diminish the extraction efficiency on the large scale, since any extraction of momentum will act in competition with natural wind-power energy dissipation by turbulence in the boundary layer.

FORBES: Researchers Warn Of Climatic Consequences To Harvesting Wind Energy On Mass Scale

Sure, a big hail storm or the like will do a number on your megabucks rooftop installation, but the sun itself, the very thing those cells are designed to capture, gradually damages their internals, reducing efficiency.

ENGADGET: Self-repairing solar cells could also fix our energy dependency