Renewables can produce an almost limitless supply of energy—but only sometimes. The result is that, even if 40% of your installed capacity is renewable, on a cloudy, windless day the majority of your power could come from coal.

To combat this problem, energy needs to be put in the bank when you have too much, so that it can be used when there is too little renewable power being generated. 

By the end of 2020, China had installed 500 million megawatts of solar and wind capacity—the equivalent to 15 billion solar panels or 206,000 utility-scale wind turbines. In the next decade, the country wants to double that figure.

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Chris Udemans

Christopher Udemans is TechNode's former Shanghai-based data and graphics reporter. He covered Chinese artificial intelligence, mobility, cleantech, and cybersecurity.