If we compare this result with experiences gained in Europe, we come to the following results. Solar trough power plants are installed in Southern Spain, where the global radiation is between 1600 and 1800 kWh/m2-a, which is more or less the same amount of radiation. But the part of direct radiation is higher, as there is no tropical climate effect, what allows us to calculate with 61 % of the global yearly radiation [2,3]. Especially the monsoon season between May and September reduces the radiation on the ground. The months between September and March reach average direct radiation values of 80 % [4].