The Chinese economy is the 2nd largest economy in the world.
They are the largest producer of electricity in the world.

China generates 5649 Terawatt/Hours a year.
This accounts for 24% of total global electricity production.

The UK generates 335 Terawatt/Hours which is 1.4% of total global electricity production.

To put this into context, the UK’s annual production of electricity equates to a tiny 6% of China annual production. This now shows the size of the Chinese economy.