Power-hungry crypto mines clean up as power cost grows
Vakhtang Gogokhia's plan to extract cryptocurrencies from the netherworld of cyberspace relies on a strategy familiar to many old-school manufacturers who use a lot of energy-the cheaper the fuel, the better.
That's why Gogokhia, who heads a startup called Golden Fleece, put a cargo container with Chinese-built computers inside a dilapidated Soviet-era tractor factory in Georgia, about 60 miles (100 kilometers) east of the Black Sea. The site made sense for running servers 24 hours a day because it has access to low-cost electricity generated by water flowing from the nearby Caucasus Mountains. There also are plans for solar panels and wind turbines.
Renewable energy is becoming the preferred way of mining digital currencies like bitcoin as prices surge and the industry seeks more computing power. While traditional fuels like coal remain staples for many utility grids, big miners including Bitmain Technologies Ltd, HIVE Blockchain Technologies Ltd and Bitfury Group are tapping clean power in places like Canada, Iceland and Paraguay-and luring investors worried about the industry's carbon footprint.
"To conquer the riches of cryptocurrency," said Gogokhia, Golden Fleece's 28-year-old chief executive officer and a former employee of the state-owned electricity grid, "we undertook the quest to build cheap, green and sustainable mining farms in Georgia."
It's easy to see why energy sources are getting more attention. The increasingly difficult computations for creating new blockchains-the encrypted digital ledgers that underpin cryptocurrencies-require ever-more powerful computers. And many of the big server farms need air conditioning to keep from overheating. The industry's electricity use jumped almost eight-fold in the past year, and spending on power can eat up 30% to 60% of revenues, Bloomberg New Energy Finance estimates.
"The price of electricity mostly drives where mining is taking place," said Christian Catalini, who founded the Cryptoeconomics Lab at the Massachusetts Institute of Technology (MIT) outside of Boston. "If the price of electricity increases in one location, mining will likely just move somewhere else."
A move toward increased mobility by producers has prompted Austria's Hydrominer GmbH and Switzerland's Envion AG to build computer-packed data centers into cargo containers that can be hauled off to new locations.
Over the past year, creating cryptocurrencies almost anywhere got more profitable as prices skyrocketed, sparking a rapid global expansion of mining activities along with hundreds of new kinds of tokens. Bitcoin alone was valued at more than $325 billion in December-exceeding the market capitalization of Wal-Mart Stores Inc., after jumping to almost $20,000 each from less than $800 a year earlier.
Still, the computers needed to create and sustain bitcoin require as much electricity every day as 30 nuclear power reactors running at full capacity, and the industry already is using more than all the world's electric vehicles, BNEF estimates. While the technology around creating cryptocurrencies may evolve to be more efficient, requiring less energy, electricity costs remain a key concern for miners, especially after Bitcoin fell to below $8,000 this month.
Compounding the risk from volatile prices, some older operations are under pressure from regulators and investors, even in places where electricity prices are low.
In China, the world's the biggest cryptocurrency producer, many server farms rely on cheap, surplus power from coal-fired plants that contribute to pollution. The government has forced industries to limit climate-warming emissions, and officials are contemplating new taxes to assert more control over domestic power markets and digital currency operations. About 70% of major bitcoin-mining pools are based in China or owned by Chinese companies, according to Blockchain.info.
With the prospect of new limits in China, investors are looking elsewhere. In Georgia, which gets about three quarters of its electricity from hydroelectric plants, Golden Fleece will pay $50 per megawatt-hour, or well below the world average of $121, BNEF data show. Iceland and Switzerland are even cheaper, while Canada and Paraguay are among those at half the global average.
"Mining with clean energy is possible and economically sound in those places," said Guy Lane, director of the Long Future Foundation, an Australian-based non-profit. The foundation promotes ideas to protect the planet and has studied the impact of cryptocurrencies on the environment.
The industry's increasing enthusiasm for finding clean power comes at a time when renewable energy has become a staple in utility grids around the world as the technology improved and costs fell. In the US, renewables like wind and solar accounted for 17% of electricity supply last year, twice the market share of a decade earlier, reducing demand for coal, government data show.