Bitcoin Difficulty Drops: Mining Economics Under Pressure

For only the second time in its history, the Bitcoin network's difficulty and implied hashrate have fallen year over year. Hashrate Index noted this significant contraction on Tuesday, attributing it to a confluence of factors including weak mining economics and competition from AI/HPC infrastructure expansion.

This reversal indicates that more mining capacity is leaving the network than new, more efficient hardware can replace. Mining revenue, measured by hashprice, is approaching historical lows, with expected miner revenue per unit of hashrate recently sitting within one cent of the record low. This situation leaves many mining operations operating near or below their break-even points.

Several factors contribute to the current mining landscape. The rise of AI and High-Performance Computing (HPC) is creating a structural competitor for capital and electricity. Public miners are repurposing sites and reserving power for AI workloads, impacting potential Bitcoin hashrate. Additionally, regional power market dynamics, such as Texas's summer curtailment programs, introduce volatility. Some hashrate recovery after early-June curtailments suggests that certain declines may have been temporary rather than permanent mine closures.