[rcxdude]

That article actually states the opposite: 74% of miners use some renewable energy. Only 39% of energy used comes from renewable sources, and most of it is hydroelectric, which is limited so miners demand for it is likely crowding out other users from it. The remainder mostly consists of coal and natural gas (there's a popular idea that miners use or can use the excess energy usage which occasionally comes from wind or solar, but the cost of the hardware they use prevents it: they will run the hardware 100% of the time to pay for it, so they represent a strong base load on the system, not a convenient energy sink for excess renewable generation).