How much Bitcoin comes from dirty coal? A flooded

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One of the great Bitcoin unknowns has long been the amounts being produced, or "mined," in what's believed to be the top locale for mining the signature cryptocurrency: China's remote Xinjiang region. We got the answer when an immense coal mine in Xinjiang flooded and shut down over the weekend of April 17–18.

The blackout halted no less than one-third of all of Bitcoin's global computing power. "We'd seen estimates that high, but this shutdown confirms them," says Alex de Vries, an economist who runs the website Digiconomist, which tracks Bitcoin's energy consumption. "We also learned that the area in Xinjiang where all that mining happens is much smaller than previously believed. It underscores China's dominance in Bitcoin mining, and that dominance raises big security concerns."

The Xinjiang accident highlights that Bitcoin is a creature of fossil fuels—principally coal, the dirtiest of them all. Its rise is even providing a lifeline for the fading natural-gas industry. In the U.S., miners from New York State to Kentucky are repurposing obsolete facilities to supply the cheap power they cherish. That Bitcoin spreads a carbon footprint bigger than Australia's, and that the run-up in its price could triple the carbon dioxide it spews, so far doesn't seem to bother the famous otherwise-green enthusiasts feeding the craze, from Elon Musk to Gwyneth Paltrow.

On April 11, the first news reports emerged that the Xinjiang mine had flooded, trapping 21 workers underground. The miners were rescued, but over the following weekend, authorities reportedly halted production while conducting a safety check, stopping shipments to power plants and causing a blackout. By de Vries's estimates, the "hash rate," the pace at which miners run algorithms to compete for fresh releases of Bitcoin, plummeted around 35%. Some in the Bitcoin community blamed the upheaval for hammering the price of the cryptocurrency by 14%, from a record $64,000 on Friday, April 16, to $55,000 on Sunday the 18th.

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