The contribution of renewable energies towards the global production of electric heat and power has been on the increase for years; its proportion, relative to primary energy consumption, is currently around 13%. Studies by renowned institutions have reasoned that this proportion can be increased to 25% by 2030 and to 50% by 2050.Looking at the capacities of the individual energy sources, there have been high, double-digit growth rates in the last few years. For example, in photovoltaics the figure was more than 40%; and in wind power, 25% per year. According to statistics global investment in renewable energies had already passed the 100 billion dollar mark (2007).
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