U.S. Winter Storm Forces Major Bitcoin Mining Curtailment
A severe late-January Arctic blast forced large-scale U.S. Bitcoin-mining curtailment, taking roughly 200 EH/s offline, slowing block production and setting up an unusually large downward difficulty adjustment.
In late January 2026, a severe Arctic blast across major U.S. mining regions forced Bitcoin miners to curtail electricity use as power systems came under stress. Luxor's Hashrate Index later estimated that roughly 200 EH/s went offline during the weather event. Block intervals slowed to around 12 minutes, making the effect visible at the network level rather than remaining a local power-market story.
The storm arrived during an already difficult period for miners. Bitcoin's price had weakened, transaction-fee revenue was unusually low and two earlier January difficulty adjustments had already moved downward. Hashrate Index calculated that uneconomic hours in ERCOT rose dramatically during the January 22–February 4 difficulty epoch and attributed the subsequent 11.16% February 7 downward adjustment to weather-driven curtailment.
The episode illustrated how deeply industrial Bitcoin mining had become integrated with North American electricity systems. Curtailable miners could rapidly shut down to reduce grid demand, but their collective scale was now large enough for a regional weather event to measurably slow global Bitcoin block production. That relationship between energy markets and the network is what makes the storm historically more significant than an ordinary fluctuation in hashrate.