Key Insights:
- Bitcoin news dominated mining circles as mempool.space projected a 14.05% increase in difficulty for February 19. It marked the largest positive adjustment since May 13, 2021.
- Winter Storm Fern drove over 110 EH/s offline in late January through coordinated miner curtailments across US grids.
- The network’s last retarget delivered an 11.16% decrease at block height 935,424, setting up a sharp snapback as miners restored operations.
Bitcoin news related to mining faced a historic inflection point as the network prepared for its largest positive difficulty adjustment in nearly five years. As of February 18, mempool.space estimated the next retarget at roughly 14.05%.
The setup reflected a mechanical response to recent volatility in hashrate. The prior adjustment boundary at block height 935,424 recorded a factor of approximately 0.888. It translated to an 11.16% decrease.
That downward move coincided with a period when blocks arrived more slowly than Bitcoin’s 10-minute target. It created conditions for an outsized positive snapback.
Winter Storm Drives Coordinated Mining Curtailments
The immediate backdrop is tied directly to Winter Storm Fern’s impact on US mining operations.
CoinShares’ January 30 equities update described “North Atlantic extreme cold weather” and estimated over 110 EH/s taken offline during the event. That framed it as one of the largest coordinated curtailments since 2021.
MARA’s operational case study quantified the response. The company curtailed approximately 770 MW across ERCOT, PJM, and SPP grids. It powered down nearly 70% of its global hashrate ahead of peak stress.
The miner cited ERCOT North Hub prices spiking to roughly $1,200/MWh as the economic driver behind proactive shutdowns. Foundry USA’s pool hashrate fell approximately 60% during the event, according to Cointelegraph reporting via TradingView.
Block production slowed to around 12 minutes as the curtailment wave compressed network hashrate. The operational dynamic illustrated miners treating load as an interruptible resource coordinated with grid operators during system stress.
Bitcoin News: Retarget Mechanics Drive Snapback Math
Bitcoin’s difficulty algorithm adjusts every 2,016 blocks using block-header timestamps to target 1,209,600 seconds. It’s equivalent to two weeks of 10-minute intervals.
When blocks arrive faster than the target, difficulty increases; when slower, difficulty decreases. The protocol caps positive adjustments at 300% and negative moves at 75%. The last epoch’s 11.16% decrease indicated that blocks arrived slowly on average over the 2,016-block window.
As miners restarted operations with controlled ramp rates following Winter Storm Fern’s passage, block times accelerated back toward the 10-minute target.
That mechanical compression created the mathematical foundation for a large positive retarget. Hashrate Index previously described a 13.55% upward adjustment in October 2022 as the largest positive move since May 2021.
The projected 14.05% increase would exceed the 2022 benchmark if realized at the boundary.
Grid Integration Reshapes Bitcoin Mining Volatility
The Fern episode highlighted miners’ growing role as grid-integrated, interruptible load. CoinShares explicitly cited demand-response agreements with ERCOT and TVA. It described them as economically rational arrangements. The firm said they were not purely altruistic grid support.
MARA’s controlled restart procedures reinforced the narrative of mining operations designed around power-market price signals. This operational model introduced new volatility patterns into Bitcoin news cycles.
Weather-driven hashrate drawdowns and subsequent snapbacks created sharper difficulty swings even as long-run hashrate trends pointed upward. The protocol’s retarget math translated abrupt operational changes into immediate on-chain adjustments.
Bitbo’s recent analysis links the weakness in hashrate to competition over AI power demand. That highlights how data-center buildouts have intensified infrastructure competition.
Additionally, AI firms’ capex plans for 2026 reinforced the scope of competition for electricity capacity and grid interconnections between Bitcoin mining and high-performance computing.
A significant upward adjustment in difficulty increased the computational work required per block. Absent corresponding increases in Bitcoin price or transaction fees, the move compressed revenue per unit of hashrate for mining operations.
Bitbo’s dashboard showed fee share versus subsidy at relatively low levels on a 24-hour snapshot. That provided context for the economic squeeze facing higher-cost operators. The sequence demonstrated Bitcoin’s incentive loop functioning as designed. Storm curtailments slowed blocks, lowering difficulty.
Miner restoration accelerated blocks, setting up a difficulty increase. The protocol continuously re-anchored issuance timing and security assumptions to the network’s moving hashrate base. Bitcoin’s security model tied aggregate hashing power to the practical cost of rewriting blockchain history.
The developer guide explicitly linked difficulty adjustments and proof-of-work calculations to maintaining the infeasibility of modifying confirmed blocks without controlling the majority hashpower.
The upcoming retarget represented the network’s automated recalibration to changing computational capacity.
Source: https://www.thecoinrepublic.com/2026/02/20/bitcoin-news-network-faces-largest-difficulty-jump-since-2021-as-miners-return-after-winter-storm/
