Ethereum mining consumes a quarter to half of what Bitcoin mining does, but that still means that for most of 2018 it was using roughly as much electricity as Iceland. Indeed, the typical Ethereum transaction gobbles more power than an average U.S. household uses in a day. “That’s just a huge waste of resources, even if you don’t believe that pollution and carbon dioxide are an issue. There are real consumers — real people — whose need for electricity is being displaced by this stuff,” says Vitalik Buterin, the 24-year-old Russian-Canadian computer scientist who invented Ethereum when he was just 18.
Buterin plans to finally start undoing his brainchild’s energy waste in 2019. This year Buterin, the Ethereum Foundation he cofounded, and the broader open-source movement advancing the cryptocurrency all plan to field-test a long-promised overhaul of Ethereum’s code. If these developers are right, by the end of 2019 Ethereum’s new code could complete transactions using just 1 percent of the energy consumed today.