Renewable energies such as solar power are, for the most part, still more expensive than conventional energies because they have only been used on a comparatively small scale so far. However, the prices of conventional energy sources do not include the costs of environmental and climate damage. Since the renewable energies have great advantages with regard to climate and resource protection as well as security of supply, it is a globally correct endeavor.

As with every emerging technology, the prices for solar cells are falling with the increase in series production and technological innovations. Because similar programs to the ones in the USA are also being launched in other countries like Japan, Germany, Spain, Netherlands etc., it can be assumed that the costs for solar power will continue to fall in the coming years. Experience has shown us that each time the total production quantity has doubled; the prices for solar modules on the world market have fallen by 20 %.