Here you find responses to the most common prejudices and arguments against renewable energies.
The usage of wind and solar energy (photovoltaics) does not make any sense. The manufacturing of the solar and wind power plants uses more energy than can be produced during the lifetime of the power plants.
The comparison with the nuclear power plant is misleading. It is true that manufacturing of solar cells is still rather energy-intensive (huge improvements have been made in this area in the recent years). But the important fact here is, that the energy needed for the manufacturing is regained by the solar power plant in a very short time. During the typical life span of a PV system of 25-30 years, it produces more than 10 times the energy that was needed for its manufacture . With wind mills this so called yield factor is even considerably larger.
Wrong. The support of renewable energies (in Germany by the very efficient German Renewable Energy Act), is only needed as the externalization of costs have distorted the market in favor of the fossil and nuclear energy sector. Costs resulting from fossil and nuclear energy production are not included in the electricity price but are paid by the general public.more
Wrong. A decentralized energy supply from wind and solar power plants in combination with flexible power consumption and short- and long-term energy storage technologies (e.g. batteries, renewable energy gas) is feasible and economic.
If you want to find out more about how this 100% renewable energy supply could be realized go to 100% Renewable.