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If renewable energy is as cheap as he claims, why do I pay more than 20ct/kWh for it in Germany with a ~50% renewables mix?

Because the price of energy generation is only a small part of the cost: https://www.cleanenergywire.org/factsheets/what-german-house...

50% are levies, fees and taxes, which partly pay for the built up of the renewable energy generation.