There is actually evidence out there that 80% of all Bitcoin mining activity is performed by Chinese companies. I saw an article today that stated between 40-60% of the power needed for this purpose in China is using dirty coal energy - that is a very bad thing for the environment and feels extremely wasteful, even if a large chunk is also coming from cleaner forms. It is highly unlikely that companies based in a country like the US will be able to mine Bitcoin at a competitive rate compared to the cost of electricity. Even while keeping at the cutting edge of technology and using renewable energy sources like solar/wind power I am not sure if companies would be able to operate at similar margins with the extra costs like property and staffing.
In general, it is ungrateful to talk about profitability in bitcoin mining, given the huge volatility of bitcoin
The Chinese energy industry has historically used more coal for its activities, but in recent years, the share of thermal power plants has been falling, and the share of wind and solar plants is growing rapidly, so there are also environmental-friendly changes. Here much depends on the position of the regional authorities, because there was information that not all the authorities of the Chinese regions are happy with the presence of mining capacity and would like to use electricity for other purposes, so the current share of Chinese miners may become less in the future, although of course now Chinese miners are ready for lower profitability than, for example, American miners.
