A powerful Arctic storm sweeping across the southern United States and the lower Ohio Valley has dealt a heavy blow to Bitcoin mining operations concentrated in states like Texas, Tennessee, Louisiana, and Kentucky. To prevent overloading the power grid amid extreme cold, major mining farms have voluntarily slashed their electricity consumption, triggering a sharp decline in the network's total hashrate.
Hashrate Loses Nearly 250 EH/s in Six Days
Data from HashrateIndex.com shows that Bitcoin's three-day simple moving average (SMA) hashrate dropped from approximately 1,053 EH/s on January 22 to 805 EH/s by January 28—a loss of roughly 248 EH/s in less than a week. Compared to the all-time high of 1,190 EH/s reached on October 15, 2025, the network has now shed 385 EH/s. The recent plunge was triggered largely by curtailment measures taken by US-based mining pools, most notably Foundry USA, which began reducing its hashrate days before the storm hit.
The sudden hashrate contraction has pushed average block intervals well beyond the standard 10-minute target. As of January 28, blocks are taking an average of 12 minutes and 12 seconds to mine. If this pace continues, the upcoming difficulty adjustment epoch around February 8, 2026, is expected to be one of the largest downward adjustments in Bitcoin's history.
Difficulty Could Drop Over 18%, Boosting Miner Margins
Current projections from HashrateIndex.com indicate that the difficulty reduction could exceed 18% if network conditions remain unchanged. Such a sizable adjustment would provide immediate relief for miners who have been struggling with low Bitcoin prices and thin hashprice margins. With lower difficulty, the same computing power can solve blocks more frequently, improving operational efficiency and near-term profitability.
However, the forecast remains conditional. If the Arctic storm subsides before the adjustment period ends and mining farms resume full operation, the hashrate recovery could shrink the difficulty drop. But weather models suggest the storm will persist into early next week, leaving little time for a significant rebound before February 8. Therefore, a record-breaking difficulty cut of over 18% remains the most likely scenario.
Although the hashrate has been trending down since October 2025—a 32% decline from its peak—the current storm event is the most acute catalyst. Market participants are closely monitoring block times over the coming days to gauge the final adjustment magnitude. For the Bitcoin ecosystem, this episode serves as a real-world stress test of the network's resilience under extreme weather conditions.