Bitcoin Mining Difficulty Adjusts as Hashrate Rebounds Alongside Price Recovery

The Hardware and Software Landscape

February 2018 is proving to be a pivotal month for Bitcoin mining. After a brutal start to the year that saw BTC plummet from its December 2017 peak near $20,000 down to below $6,000 in early February, the network’s mining infrastructure is recalibrating. Bitcoin has now reclaimed the $10,000 mark, trading at approximately $10,550 as of mid-February, and the mining ecosystem is responding in kind.

The dominant mining hardware in early 2018 remains the Bitmain Antminer S9, which delivers roughly 13.5 TH/s at around 1,300 watts. Canaan’s AvalonMiner 741 and Bitmain’s L3+ for Litecoin mining are also widely deployed. These ASIC machines, priced between $1,500 and $3,000 during the height of mining fever in late 2017, are now finding their way into operations ranging from basement setups in Eastern Europe to industrial-scale farms in China’s Xinjiang and Sichuan provinces.

Mining software has matured alongside hardware. CGMiner and BFGMiner remain staples for custom setups, while Bitmain’s built-in firmware dominates the ASIC market. Pool mining software like Braiins OS is gaining traction among operators seeking finer control over their machines’ performance parameters.

Hashrate and Difficulty

Bitcoin’s network hashrate experienced significant turbulence in January and early February 2018. As the price crashed from $20,000 to sub-$6,000 levels, many smaller miners found their operations unprofitable and shut down their rigs. The hashrate dropped from its January peak of roughly 25 exahashes per second (EH/s) to approximately 20 EH/s — a roughly 20 percent decline in a matter of weeks.

The network’s difficulty adjustment mechanism, which retargets every 2,016 blocks (approximately two weeks), responded as designed. The difficulty decreased by roughly 15 percent between late January and mid-February, one of the largest downward adjustments seen since the China mining crackdown episodes of 2017. This adjustment made mining proportionally easier for the remaining operators, helping stabilize block production times around the 10-minute target.

By February 16, with Bitcoin back above $10,000, hashrate is climbing again. Miners who suspended operations are powering rigs back on, calculating that the improved revenue per terahash justifies the electricity costs. Mining pools report increasing participation, with F2Pool, Antpool, and BTC.com accounting for over 50 percent of total network hashrate.

Profitability Metrics

Profitability in February 2018 is a moving target. With Bitcoin at $10,550 and average electricity costs of $0.10 per kilowatt-hour, an Antminer S9 generates approximately $6 to $8 per day in revenue after electricity — a far cry from the $30-plus daily returns of December 2017, but still comfortably profitable for efficient operators.

The breakeven price for an Antminer S9 running at $0.10/kWh hovers around $4,500 to $5,000. This means miners who weathered the February dip to $5,947 on February 6 were operating on razor-thin margins. Those in regions with cheaper electricity — particularly China’s hydro-rich Sichuan province, parts of Iceland, and Georgia — maintained healthy margins even at the bottom.

Pool fees typically range from 1 to 4 percent of rewards. With block rewards at 12.5 BTC plus transaction fees averaging 0.5 to 1 BTC per block, the total daily mining revenue across the network runs approximately $25 million at current prices.

Environmental Impact

Bitcoin’s energy consumption continues to attract scrutiny in February 2018. The Bitcoin Energy Consumption Index published by Digiconomist estimates the network’s annual electricity usage at approximately 50 terawatt-hours — comparable to the entire energy consumption of countries like Portugal or Hungary.

European Central Bank executive board member Yves Mersch highlighted these concerns in a Paris speech on February 15, 2018, dismissing Bitcoin as a speculative digital asset rather than a currency. While Mersch’s critique focused on monetary policy rather than environmental impact, the subtext of wasteful energy expenditure underscores growing institutional discomfort with proof-of-work mining.

Some mining operations are pivoting to renewable energy sources. Iceland’s geothermal and hydroelectric power grid continues to attract miners, and several Chinese operators are relocating from coal-dependent Inner Mongolia to hydro-powered Sichuan ahead of the summer rainy season. The tension between Bitcoin’s energy appetite and environmental sustainability remains unresolved.

Strategic Outlook

Fundstrat’s Thomas Lee, speaking on February 16, projected Bitcoin could reclaim its all-time high by July 2018, citing historical recovery patterns. If accurate, this trajectory would push mining profitability back to December 2017 levels, likely triggering another wave of hardware investment and new mining operations coming online.

The next difficulty adjustment, expected in late February, will likely reflect the returning hashrate with an upward retarget. Miners who re-enter now at lower difficulty levels stand to benefit from this adjustment lag — earning proportionally more BTC per terahash until the network catches up.

For mining operators, the strategic calculus is straightforward: scale up during difficulty troughs, secure cheap electricity contracts, and ride the recovery. The February 2018 correction, painful as it was, has sifted out inefficient miners and left the network in healthier hands. The arms race continues, but the players are more battle-tested than ever.

Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Mining profitability depends on numerous factors including hardware costs, electricity rates, and Bitcoin price movements. Conduct thorough research before investing in mining equipment.