A price ceiling means that it's illegal to sell electricity above a certain price. Even the most resource rich places, still have a limited energy supply.

When the price is held down artificially, energy intensive activities will expand to take advantage of the lower prices.

Plus it is pretty easy to move bitcoin and make it disappear. 
I thought with their unlimited energy, there wouldnt be a ceiling?

Satosora

Price ceilings create shortages. Bitcoin miners were just one of the more convenient groups to scapegoat for the inevitable result of bad policy.