Hasn the GreenTower the lowest efficiency?
Generally speaking, this is true at present, although apples are often compared with pears. Large concentrating technologies do for efficiency purposes not refer to the total surface required for their devices, large arrangements of parabolic or trough mirrors, but only to the aperture of these devices, although the land in between cannot be used for anything else. They also do not refer to their high production losses with an overcast sky. After all, the decisive parameter is not efficiency but the cost of the solar field (including plant load factor) for a given power output, since sunshine is free. Incidentally even with the present low efficiency of 2% to 4% the Updraft Tower without greenhouse has the lowest solar field costs of all solar technologies, whereby the GreenTower will cut them by a further 67%. Only Updraft Tower/GreenTower solar field costs are lower than the fuel costs of conventional power stations.
