Nuclear power and coal had their heyday in the second half of the last century. In particular, since the oil-price shock of 1973, industrialised countries were anxious to preserve energy independence. Hundreds of nuclear power stations were set up in a record time. “If central photovoltaics (PV) power plants are integrated in an extensive power grid no special problem will occur since the situation is the same as for conventional power plants”. “Only as an independent power generator it is preferable to add an electrical storage device”. “PV power generators employing very low-cost Solar cells will be cost effective at almost any power level, even at some Watts or kW. “Solar generators installed close to the consumers may prove to be attractive because they avoid excessive transmission costs, and when mounted on roof tops or other available structures eliminate the need for land purchasing, site preparation, and supports”.