Renewable energy

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Solar energy DOE
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Above all, in view of the imminent climate catastrophe, many countries want to switch their electricity production increasingly to climate-friendly renewable resources.

Research and technology in this area is growing rapidly, but it still often fails with its application. Why have capacities not been used so far? What potential do the sun, wind and co. Actually have? When is the use worthwhile? Is electricity from renewable energies always more expensive than "conventional" electricity?