Not the parent commentor, but this is certainly true to some degree. To what extent is very hard to say, but China has built several large hydroelectric projects in remote areas where electricity is very inexpensive. Many miners have taken advantage of this.

http://technode.com/2017/02/27/bitcoin-mining-sichuan-cheap-... https://www.washingtonpost.com/world/asia_pacific/in-chinas-...

Of course, there is also cheap coal power in China, so the environmental impact may be very significant.

Going forward, I anticipate the rise of solar mining in some favorable areas. Possibly geothermal as well. Since Bitcoin mining can be done anywhere with decent internet access, it seems natural that it should gravitate toward renewables over time. Fossil fuels continue to get more expensive, while renewables get cheaper. Of course, building e.g. solar panels isn't without environmental impact, either.