Hi @crypto.piotr,
China may not be mining Bitcoin, but Bitcoin hardware is manufactured in China. ASICs Antminer mining equipment are produced by Bitmain, which is headquartered in Beijing.
How can bitcoin store energy?
Energy such as oil, coal and nuclear power holds value. Hence Bitcoin, which is a final product of electricity, holds true power and value. Because it takes a lot of energy to mine Bitcoin, its true value may still be undervalued. However, this idea is still controversial.