"Solar and wind power have grown to a mere 3.5% of primary energy production. The levelised cost of renewable energy – which measures the net present value of electricity produced over a plant’s lifetime – has declined sharply over the years. But this has not resulted in lower electricity prices. In fact, as the share of the energy mix provided by renewables has risen, electricity prices have tended to increase. That’s because wind and solar power are intermittent. Since storing energy in batteries is uneconomic, traditional sources of power are still needed as backup, which is expensive".
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